Abb Fox Synchronisation r8 Rc 1khw002008

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ABB Power Systems

FOX515

SynchronisationUser Manual


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User Guide FOX Synchronisation (R8)

User Guide

FOX Synchronisation

Platform FOX515 Release R8

Release History: Release 7B: February 2007Release 8B: December 2008Release 8C: August 2009

December 2009May 2010

Copyright and Confidentiality: All rights of this document remain with ABBLtd (ABB). This document contains confidential information which is theproperty of ABB. It must be held in confidence by the recipient and may not

be used for any purposes except those specifically authorised by contract orotherwise in writing by ABB. This document may not be copied in whole or inpart, or any of its contents disclosed by the recipient to any third party,without the prior written agreement of ABB.

Disclaimer: ABB has taken reasonable care in compiling this document, however ABBaccepts no liability whatsoever for any error or omission in the informationcontained herein and gives no other warranty or undertaking as to itsaccuracy.

ABB reserves the right to amend this document at any time without priornotice.

Document number: 1KHW002008

ABB Ltd

Power Systems

Bruggerstrasse 72

5400 Baden Switzerland

ABB Switzerland Ltd, 2010

The right to modifications or deviations due to technical progress is reserved.

1KHW002008 page 2 of 132 ABB


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Table of contents

iPrecautions and safety 6Referenced documents 6

1 Overview of the NE timing system 9

The NE timing system 9

General 9

PETS/SETS timing and synchronisation functions 10

SETS with 2 SBUS/ABUS Sectors 11

Clock frequency aspect of the timing system 13

Block diagram 13

Source selection 15

SETS Inter-Sector Synchronisation 15

Clock recovery 16

Traffic sources 17

Dedicated interfaces for timing signals 17

Status and selection override 19

QL-processing aspect of the timing system 20

UBUS/PBUS traffic units and ESI-PDH 21

STM-4/1 traffic interfaces and ESI-SDH 22

ESO-PDH 24

ESO-SDH 24

SSI/SSM processing and selection algorithms 27

Protection 28

Protection types 28

SETS Protection 28

PETS Protection 29

Status/Maintenance 30

Selection of timing sources 31

Timing sources for PETS 31

PETS selection algorithms 31

Clock Recovery 32

Timing sources for SETS 32

SETS selection algorithms 32

Clock Recovery 33

ESO timing signals 34

ESO-1 3/PDH 34

ESO-4/SDH 34

Selection of the equipment timing source 36

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NE without STM-4/1 interface(s) 36

NE with STM-4/1 interface(s) 37

2 Configuration of the PETS system 41

Traffic (timing) sources 41

Selection algorithm and clock extraction 44

Timing sources and parameters 44

Selection Algorithm 46

Clock Extraction 47

ESO-PDH 48

Routing Table 48

Signal squelch 49

3

Configuration of the SETS system 51

Traffic sources 52

Selection algorithm and clock extraction 55



ESO-SDH (Non SETS locked mode) 59



Signal squelch 62

ESO-SDH (SETS locked mode) 63

Routing Table 64

Signal squelch 65

4 Routing and mapping tables of units 67

Application 67

LOMIF type E12/P12 traffic signal layer 68

MEGIF type E12/P12 traffic signal layer 70

STM-4/1 MS traffic layer 72

Input Mapping Table 72

Output Mapping Table 73

Routing Table 74

5 Status/Maintenance of the NE timing system 75

Generic description 75

PETS layer 79

Functions and parameters 79

Use of PETS diagnostic functions and examples 81

SETS layer 85



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Use of SETS Timing Sources Status and examples 90

ESO-SDH layer 105


Use of ESO-SDH Timing Sources Status and examples 108

SETS Protection layer 111


Use of SETS Protection and examples 112

Alarms & Notifications 117

Alarms 117

Notifications 117

6 Synchronisation networks 119

Introduction 119

Background information 119

Solution / Recommendation 120

Allocation of clock domains 120

Synchronisation network robustness 122

Configuring master-slave synchronisation networks 130

7 Engineering limits 131

Number of intermediate SEC nodes in SDH networks 131


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Precautions and safety

For generic information on precautions and safety refer to the user guide

precautions and saftey.

Read carefully through the chapter "Precautions and Safety" before you startwork and ensure that you are familiar with all safety information provided.

Observe all the precautions to limit the risk of personal injury or damage toequipment. In addition, observe the general safety procedures establishedby your company.

Read now "Precautions and Safety".

Referenced documents

1KHW002000 Precautions and safety

1KHW002045 SYNIO 305 User Guide

1KHW002044 SYNIF 164, 604 & SYNIC 118, 168 User Guide

1KHW002047 SYNUF 606 User Guide

1KHW002041 SYN4E 610 User Guide

1KHW002059 FOX User Guide

1KHW002001 FOX TDM System & Cross Connections User Guide

1KHW002013 COBUX 212, 213, 219, 223 & COBUV 217, 218, 220, 224 User Guide

1KHW002024 LOMIF 158, 152 & LOMI4 159, 151 User Guide

1KHW002032 PHLC3 127 User Guide

1KHW002041 SYN4E 610 User Guide

1KHW002060 UCST / System Operation Basics User Guide

1KHW002061 FOX MCN, Operation and Maintenance User Guide



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Technical supportABB Technical Support is available as follows:

ABB Switzerland Ltd

Power Systems

Utility Communications

Bruggerstrasse 72

5400 Baden

Switzerland

Phone: +41 58 589 37 35

or: +41 844 845 845 (Call Center)

Fax: +41 58 585 16 82

E-Mail: [email protected]

URL: www.abb.com/utilitycommunications

mailto:[email protected]:[email protected]://www.abb.com/utilitycommunicationhttp://www.abb.com/utilitycommunicationmailto:[email protected]


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User Guide FOX Synchronisation (R8) Overview of the NE timing system

1 Overview of the NE timing system

The NE timing system

General The FOX provides the SETS and the PETS system for the NE and trafficsignal synchronisation:

PETS (Plesiochronous Equipment Timing Source)

The PETS system synchronises the PDH traffic signals and the ESO-1 3 timing signal outputs of the NE. The ESI-1 2 accept 2 MHz timingsignals for the PETS system.

It is possible to lock PETS to SETS if required. In this case, the SETSsystem provides the leading timing source.

The PETS functionis implemented on the COBUcontrol unit.

Two redundant control units provide automatically equipment protectionfor the PETS function.

SETS (Synchronous Equipment Timing Source)

The SETS system synchronises the STM-4/1 traffic signals and theESO-4 timing signal output of the NE. The ESI-1 accepts a 2 MHz timingsignal for the SETS system

Synchronisation via SETS is independent of PETS. It is however possibleto synchronise the PETS system to SETS.

The SETS functionis implemented on selected traffic units with STM-4and STM-1 interfaces:

SYN4E (SBUS unit) SYN4E 610 User Guide

SYNUF (SBUS unit) SYNUF 606 User Guide

SYNIF (SBUS unit) SYNIF 164, 604 & SYNIC 118,

168 User Guide

SYNIC (SBUS unit) SYNIF 164, 604 & SYNIC 118,168 User Guide

SYNIO (SBUS unit) SYNIO 305 User Guide

Hence SETS is only available with at least one of the above units imple-mented in the FOX.

The SYNI, SYNUF, SYN4E and ATIOP units can provide equipmentprotection for the SETS function (for details on the availability of theSETS protection refer to the corresponding unit descriptions and releasenotes).



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Overview of the NE timing system User Guide FOX Synchronisation (R8)

The COBU control units provide interfaces for external timing signals(ESI inputs and ESO outputs) as follows:

COBUX, COBUV

support all the interfaces for external timing signals (ESI inputs and ESO

outputs) for the PETS and SETStiming systems.

COBUL, COBUQ

support all the interfaces for external timing signals (ESI inputs and ESOoutputs) for the PETS timing systems only.

Please note that redundancy for the ESO and ESI interfaces always requires2 control units.

PETS/SETS timing andsynchronisation functions

The PETS and SETS timing systems of the FOX provide the following timingand synchronisation functions in the NE:

SBUS (and/or ABUS) timingSETS is

mandatoryto operate the SBUSwhich transports TU-12 and TU-3traffic synchronously to the STM-4/1 frames between the SBUS unitsin the SBUS sector.

not relevantfor the operation of theABUS. The ABUS transports celltraffic between the ABUS units in the ABUS sector. The ABUS clockcan be locked to SETS or PETS. SETS has no importance for celltraffic.

However, the ATIOP unit requires SETS for its STM-1 interface.

Selection of a traffic data streamor a timing signalwhich is input to the

NE for the generation of the NE timing signals: Configuration of selected timing sources for the generation of timing

signals.

Configuration of the selection algorithm for the timing sources for thecase of failures or degradation of the selected timing signal sources.

Local clock recovery, generation and distribution.

Establishment of the Mapping Tables (if applicable) for the input timingsignals.

Establishment of Routing Tables and Mapping Tables (if applicable) forthe data streams and timing signals leaving the NE.

Implementation of synchronisation information in the data streams leav-ing the NE.

Since the last 3 functions are implemented on the unit level, the configura-tion of the timing system affects the NE and the unit level. While the mainpart of synchronisation affects the NE, the availability and implementation oftraffic signals depends on the corresponding traffic unit.

The dialogue Timing Sources Status provides diagnostic functions for theanalysis of the NE timing system.

The NE timing system provides separate processing for the clock signalsand their assigned QLs (Quality Levels). The traffic interfaces extract thequality information from the signal at the input and add the corresponding

quality information to the traffic signal at the output.



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The clocks (frequency) use clock bus structures for the distribution of thetiming signals. The QL-processing relies on the internal communicationstructure of the FOX.

Please note that most of the synchronisation aspects have their

relevance mainly with TDM traffic signalsand units with TDMtraffic interfaces.

For ATM traffic, most of the synchronisation and QL-informationprocessing functions are not applicable or relevant.

SETS with 2 SBUS/ABUSSectors

Application The UCST R8 allows you to operate the 2 SBUS/ABUS sectors of theFOX515 simultaneously. Depending on the configured traffic units the samephysical bus of a sector transports the SDH traffic of SBUS units or ATMcells of ABUS units.

It is not possible to simultaneously operate SBUS and ABUS units on thesame bus. A bus sector is either operated as SBUS or ABUS. The 2SBUS/ABUS sectors of the FOX515

are independent and self-contained from the traffic signalpoint ofview.

SDH trafficunits (SBUS)

The SBUS allows VC-12 and VC-3 cross connections only within thissector. It is not possible to access the SBUS from other units than theunits in slots with access to the SBUS/ABUS sector.

The SBUS sector is independent of the other sector (applies for theFOX515 only).

ATM trafficunits (ABUS)The ABUS transports ATM cells between units only within this sector.It is not possible to access the ABUS from other units than the units inslots with access to the ABUS sector.

The ABUS sector is independent of the other sector (applies for theFOX515 only).

build one logical SETS systemthat synchronises both SBUS/ABUS sec-tors (if applicable).

This means that all the

SBUS units and ABUS units with SETS (i.e. ATIOP) of both (if appli-cable) SBUS/ABUS sectors provide potential sources for the NE

SETS system. ESI input signals (input via COBUX, COBUV) affect the synchronisa-

tion in both sectors the same way.

PBUS and other traffic units (if applicable) can provide timing signalsfor the NE SETS system.

SBUS units of both (if applicable) SBUS/ABUS sectors use the sameSBUS clock for their traffic signals.

ATIOP units of both (if applicable) SBUS/ABUS sectors use the sameclock for their SDH traffic signals.

The physical implementation of the logical SETS system relies on the lo-cal SETS circuits of each SBUS/ABUS sector. The local SETS circuits inboth SBUS/ABUS sectors run synchronously.



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With the UCST you configurethe logical SETSsystem. The physical SETSsystems (as shown in the block diagram below) are not visible:

Configuration

The SBUS/ABUS sector where the first SYNI, SYNUF, SYN4E orATIOP is (UCST) configured becomes the Prime SETS Sector.

The physical SETS circuit of the Prime SETS Sector provides the masterSBUS synchronisation signal for the NE.

The Prime SETS Sector provides the timing signals for the ESOinter-faces of the COBUX or COBUV control units and reads the timing signalsfrom the ESIinterfaces of the COBUX or COBUV.

The other sector automatically becomes theAgent SETS Sector.

The physical SETS of the Agent SETS Sector synchronises its localSBUS/ABUS clock signal to the master SBUS synchronisation signal.

Protection It is possible to implement SETS circuit (unit) protection independently forthe Prime and the Agent SETS Sector.

It is notpossible to protect the Prime SETS Sector with the Agent SETSSector. If the Prime SETS Sector fails, there is no way to recover its SETSfunction from the Agent SETS Sector. The Agent SETS sector synchronisesto its local internal clock signal.



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Clock frequency aspect of the timing system

Block d iagram The block diagram below shows the clock frequency aspect of the NE timingsystem and the QL/SSI processing at the unit interfaces. The block diagram

shows the full physical system including the SETS systems for bothSBUS/ABUS sectors.

In addition, the diagram shows the interaction between the functional blocksof the timing systems and the corresponding UCST dialogues.

The diagram does not show the internal QL-processing within the SETS andPETS timing systems. The paragraph "QL-processing aspect of the timingsystem" describes this aspect.

If the Prime SETS Sector features redundancy for the SETS and/or the NEhas redundancy for its PETS function, either of the Working or the ProtectingUnit may provide the active Control and Selection block. The active blockdrives the timing signals and processes the QL-information. The protecting

block processes the same timing signals and information in parallel but hashigh impedance outputs.



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In the block diagram, you can easily identify the generic elements of theSETS (upper part) and the PETS (lower part) system.

Source selection

SETS

Select A

The Select A pre-selects the timing source for the ESO-4/SDH output(via Select C) if this output operates in the mode Non SETS locked.

The Select A has access to all SETS compatible traffic sources andESI-1.

Select B

The Select B selects the timing source for the SBUS/ABUS and con-sequently for all STM-4/1 traffic signals leaving the NE. Simultane-ously it provides the timing source for the ESO-4/SDH output (via Se-lect C) if this output operates in the mode SETS locked.

The Select B has access to all SETS compatible traffic sources andESI-1. Additionally it can select the frequency of the internal source if

no other source is available or during holdover.

Select C

The Select C selects the timing signal for the timing signal ESO-4/SDH interface depending on the ESO-SDH mode:

ESO-SDH: Non SETS lockedThe timing signal for the ESO-4/SDH is provided via the Select Aswitch. A squelch circuit suppresses the ESO-4 timing signal fromSelect A if the QL of the selected source signal matches configur-able QL values.

ESO-SDH: SETS lockedThe timing signal for the ESO-4/SDH is provided via the Select B

switch. A squelch circuit suppresses the ESO-4 timing signal fromSelect B if the QL of the selected source signal matches configur-able QL values.

A programmable squelch function allows you to suppress the timingsignal at the ESO-4/SDH output for distinct QL values provided withthe selected timing signal.

PETS

Select P

The Select P selects the timing source for the PETS and theESO-1 3/PETS interfaces.

SETS Inter-Sector Syn-chronisation

The synchronisation between the Prime SETS Sector and the Agent SETSSector is established via the SETS Inter-Sector Synchronisationsignal(SISS signal):

A dedicated clock bus line (bi-directional) links the Agent SETS Sector tothe Prime SETS Sector. Both sectors access the bus line via a dedicatedSISS switch that connects the SISS signal as an input or output for theirSETS system.

The Prime SETS Sectorprovides the timing signal of its SETGvia theswitch (set to output) and the clock bus line to the Agent SETS Sector.TheAgent SETS Sectorfeeds the SISS signal from the clock bus line

via its SISS switch (set to input) to its SETS Select B.



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If the Prime SETS Sector fails, the Agent SETS sector synchronises to itslocal internal clock signal. The working SETS unit in the Agent SETS Sectorcreates the SETS Inter-sector Synchronisationfault and the NE issues acorresponding alarm.

The ESI and ESO signals of the Prime SETS Sector are automatically linkedwith the COBUX or COBUV control unit.

Clock recovery SETG and Holdover

The SETG (Synchronous Equipment Timing Generator) reconditions thesignal of the selected SDH timing source for the synchronisation of theNE and if applicable for the ESO-4/SDH.

The Internal Frequency circuit provides a reference clock signal of a veryprecisely defined frequency. The SETS system uses the clock of the In-ternal Frequency in two ways:

Internal frequency reference

After a power-up, the Internal Frequency circuit generates a referenceclock signal with a factory pre-set frequency (f0). The SETS systemsynchronises to this clock as long as there is no SDH timing sourcewith a higher priority or QL available.

This selection corresponds to the Internal selection for the SETS sys-tem. The Internal Frequency circuit generates the clock (frequency).The clock operation mode is Free runningand the input provides theQL = 11 (Internal) that is fixed assigned to this clock selection.

Once SETS synchronises to a SDH timing source, the automatic se-lection algorithm for timing sources can no longer enter this mode.However, the synchronisation maintenance functions allows you to

override the automatic selection of the timing sources and force theclock operation mode to Free running.

Holdover

For clock operation modes Lockedthe Source Monitor circuit moni-tors the frequency of the selected timing source signal and makes theInternal Frequency circuit generate a clock signal of the same fre-quency (with an accuracy of 0.02 ppm).

If the selected source fails, the Internal Frequency circuit instantlyfreezes the frequency of its signal and SETG switches immediately tothis clock signal. The SETS system enters the clock operation modeHoldover. The frequency of SETS now corresponds very accurately

to the frequency of the SDH timing source before the failure.In Holdover, the SETS system evaluates an alternative timing sourceand the Selector B switches the corresponding signal to the SETG in-put. During this time, the selector B still provides the QL of the failedtiming source. If the new reference signal is available for the SETG,the SETS system releases the Holdover mode and SETG switches tothe new reference clock signal. The clock operation mode is Lockedagain.

If no SDH timing source is available, the Internal Frequency circuitcontinues to provide its clock signal (with the frozen frequency) butnow provides the QL (= 11) for Internal. The clock operation mode is

Lockedto Internal.



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PETS

The PLL allows you to select a PLL-filter with a high or low Q to adapt thejitter transfer function of the timing signals.

Traffic sources The traffic units provide the timing sources that rely on clock signals ex-tracted from the traffic signals. The traffic signal interfaces monitor the qual-ity of the incoming traffic signal and stop providing their clock signal in thecase of TSF (Traffic Signal Fail) or TSD (Traffic Signal Degraded) traffic sig-nal conditions. The interface generates the TSF and TSD flags based onfailures of the layer 1 and other criteria such as TTI mismatch, BER etc.

The subunits extract the SSM and SSI information from the traffic signals atthe traffic signal inputs and adapt the QL if the subunit has a correspondingInput Mapping Table (SYNI, SYNUF, SYN4E, ATIOP). The subunits pro-vide this QL information (QL-STMIN, QL-PDHIN) for further processing in theSETS and PETS timing system.

It is possible to assign a traffic source to each of the internal SETS clockbuses and (if applicable) to each of the internal PETS clock buses. In themode SETS onlythe UCST automatically assigns the SETS timing signalfrom SETG to the PDH-3 clock bus as the only timing source for the PETStiming system. In this mode it is not possible to configure timing sources forPETS.

Please note that the SYN4E has some restrictions with the accessto the internal SETS clock buses and with the selection of PDHtiming signals.

Dedicated interfaces fortiming signals

The timing systems provide dedicated inputs ESI and outputs ESO for 2048kHz timing signals. The COBU control unit provides all dedicated inter-faces for external timing signals.



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Figure 1-2: COBU synchronisation interfaces

Please note that the SDH func tionalitiesof the ESI-1 and theESO-4 are only available with the COBUXand COBUVcontrolunits!



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Figure 1-3: Summary of synchronisation interfaces characteristics

IF PETS SETS Impedance Galvanic

75 120 separation

ESI-1 X X X (X) X

ESI-2 X - X - X

ESO-1 X - X - (X)

ESO-2 X - X - -

ESO-3 X - X - -

ESO-4 - X X (S) (S)

(X) and (S) tagged features are available with the templates and COBUhardware as follows:

(X), (S) COBUX (R3) 145, 146(R4) 212, 213(R5) 219, 223: ROFBU 367 103/1 R2B

(X), (S) COBUV (R3) 137, 237(R4) 217, 218(R5) 220, 224: ROFBU 367 103/2 R1A

(X) COBUL (R3) 215(R4) 216: ROFBU 367 215/1 R1B

(X) COBUQ (R3) 144: ROFBU 367 114/1 R2C

Older COBU hardware does not support the (X) features.

Older COBUX and COBUV hardware does not support the (S) fea-tures.

Status and selection over-ride

A comprehensive status menu allows you to read the status of the NE timingsystem and to temporarily override the automatic selection to debug and testthe NE timing:

Force the selection of a timing source

Lockout timing sources from the NE timing system

Keep SETS in the Holdover mode



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QL-processing aspect of the timing system

The QL (Quality Level) information for synchronisation purposes is a part ofthe SSM (Synchronisation Status Message) signalling system for PDH and

SDH signals.The table below shows the definition of the QL levels according to the ITU-Tstandards (PDH according to ITU-T G.704, SDH according to ITU-T G.707):

Four 4-bit patterns for synchronisation levels are agreed to within ITU-T.

Two additional 4-bit patterns are assigned as follows:

One pattern to indicate that the quality of the synchronisation is un-known (bit pattern 0000)

One pattern to indicate that the signal should not be used for syn-chronisation (bit pattern 1111)

The remaining codes are reservedfor quality levels defined by the indi-vidual operators.

Figure 1-4: Allocation of QL with SSM

QL Bit Pattern(Note 1)

Synchronisation Quality Level (QL) descript ion

0 0000 Quality unknown (existing synchronisation network)

1 0001 Reserved

2 0010 Rec. G.811

3 0011 Reserved

4 0100 SSU-A (Note 2)

5 0101 Reserved

6 0110 Reserved

7 0111 Reserved

8 1000 SSU-B (Note 2)

9 1001 Reserved

10 1010 Reserved

11 1011 Synchronous Equipment Timing Source (SETS)

12 1100 Reserved

13 1101 Reserved

14 1110 Reserved

15 1111 Do not use for synchronisation

NOTE 1 The 4-bit patterns are implemented in the Sa-bits of the TS0 for PDH andin the S1-bits for the SDH traffic signals.

NOTE 2 Synchronisation Supply Unit (SSU) type A and type B align with the clockdefinitions in Recommendation G.812.

In the FOX separate processes handle the QL (Quality Level) information ofthe timing signal sources. The SETS and PETS system can use the QL of atiming source as one of the parameters for the selection of their reference

timing source.



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It is possible to manually override the QL of a timing source (with restrictionshowever) or to modify the QL-information via mapping tables. If the incomingsignal features no QL information (signals with SSI, none), a default QL willbe assigned to these signals.

The UCST allows you normally (some of the sources provide restrictions) toassign QL values from 1 14. The FOX uses the QL = 15to signal Do notusethis traffic signal for synchronisation.

The processing of QL depends on the timing system (SETS, PETS) and thetraffic signal interfaces. The following paragraphs describe some of the mostimportant processing schemes.

UBUS/PBUS traffic unitsand ESI-PDH

The diagram below shows the QL information handling for traffic interfaceswith access to the UBUS/PBUS and for the ESI PDH timing signal inter-faces.

Figure 1-5: QL handling for UBUS/PBUS traffic units and ESI PDH

QLRX

Traffic signal

Input Override QL by

Routing Table

Timing SourceSelection

PETS

QLTX

Traffic signal

Output

QLOutQLInQLTS

Selected Source

Extraction ofQL, SSM

Override by

QLFix

QLIn

Override by

QLFix

ESI PDH

Received

QLFix

QLFix

QL basedselection

Priority basedselection

Do not u se

Can be used

Unit Configuration Unit ConfigurationNE Configuration

The traffic sources may or may not use SSM and therefore the traffic signalinterface is able or not able to extract a QLRXfrom the incoming traffic signal:

Traffic sourceprovides a timing signal with SSM

It is possible to configure the timing system so that the

QLTSis forwarded as received

QLTSis overwritten with a specified value

to generate QLInfor the Timing Source Selection.

Timing source without SSM(SSI, none)

It is possible to assign a specified QL to the timing source. Before youcan assign a QL, you have to select a priority for the timing source sincethe default of the source is "disabled".

The timing signals that are provided via the ESI PDH interfaces do not carrySSM information. It is also possible to assign a QL for these signals.



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Values for QL that you assign are "artificial values" without directrelation to the quality of the timing source.

The traffic signals leaving the NE carry normally SSM information that corre-

sponds to the selected timing source (SETS and PETS). However it is pos-sible to override this information via the

Output Routing Table

The routing table defines for each traffic signal (leaving the NE) whetherthe signal can be used or not used for synchronisation purposes.

Depending on the selected source the Routing Table marks the trafficsignal with "Can be used" or "Do not use".

Only the NE with a QL based selection mode interprets the "Do notuse" in the traffic signal. If the signal is input to an NE with a Prior-ity Table based selection algorithm the traffic signal might be usedfor synchronisation according to its priority.

STM-4/1 traffic in terfacesand ESI-SDH

The diagram below shows the QL information handling for STM-1 trafficinterfaces and for the ESI SDH timing signal interface.

Figure 1-6: QL handling for STM-1 traffic units and ESI SDH

QLRX

Traffic signalInput

Override QL by

Routin g Table

Timing Source

Selection

SETS

QLTX

Traffic signal

Output

QLOutQLIn

QLTS

Selected Source

Extraction o f

QL, SSMInput MappingTable for QL

QLIn

Override by

QLFix

ESI SDH

Received

QLFix

QLFix

QL based

selection

Priority based

selection

Do not use

Can be used

Unit Configuration

Unit ConfigurationNE Configu ration

QLAdapt ed

Override byQLFix

Output Mapping

Table for QLQLAdapt ed

QLTSQLAdapted

QLOut QLAdapted

QLIn

QLIn



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The STM-4/1 traffic based synchronisation system provides the followingfunctional blocks for the QL processing at the input:

Input Mapping Table

The Input Mapping table for the STM-4/1 traffic signals maps the QLRXin-

formation that is extracted from the traffic signal to new QL valuesQLAdapted.

Override by QLFix

It is possible to configure the timing system so that the

QLAdaptedis forwarded as received

QLAdaptedis overwritten with a specified value

to generate QLInfor the Timing Source Selection.

ESI SDH

The timing signal that is provided via the ESI SDH interface does notcarry SSM information. It is also possible to assign a QL for this signal.

Before you can assign a QL, you have to select a priority for the timingsource since the default of the source is "disabled".

Values for QL that you assign are "artificial values" without directrelation to the quality of the timing source.

The traffic signals leaving the NE normally carry SSM information that corre-sponds to the selected timing source (SETS and PETS). However it is pos-sible to override this information via the

Output Mapping Table

The Output Mapping Table for STM-4/1 traffic signals maps the QLOUTfor

the NE timing to new values QLAdapted. Output Routing Table

The routing table defines for each traffic signal (leaving the NE) whetherthe signal can be used or not for synchronisation purposes.

Depending on the selected source the Routing Table marks the trafficsignal with "Can be used" or "Do not use".

Only the NE with a QL based selection mode interprets the "Do notuse" in the traffic signal. If the signal is input to an NE with a Prior-ity Table based selection algorithm the traffic signal might be usedfor synchronisation according to its priority.



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ESO-PDH Figure 1-7: QL handling for the ESO-1 3/PDH outputs

Override QL byRouting Table


PETS(SETS for "SETSonly")

ESO- 1 3PDH

QLOutQLIn

Selected Source

QL based selection


Do not use

Can be used

NE Configuration

Output MappingTable for QL

Squelched

from TimingSignal Sources

for PETS

Squelch

Do not squelch

Timing Signal is suppressed for- "Squelch" and- "Do not use" respectively

Timing signalwithout QL

The timing source selection for the ESO-1 3/PDH depends on the se-lected Equipment Timing Source:

SETS and PETS

The PETS system has its own sources which steer the Routing Tables ofthe ESO-1 3/PDH outputs.

SETS only (PETS locked to SETS)

The PETS system is locked to the SETS system which provides the tim-ing sources to steer the Routing Tables of the ESO-1 3/PDH outputs.

The Output Mapping Table for QL allows you to squelch (suppress) the tim-ing signal for selectable QL values. A squelched timing signal is suppressedand no longer available at the ESO interface.

The Routing Table suppresses the timing signal for an ESO depending onthe selected reference timing source. For this purpose it is possible to con-figure the Routing Table "Do not use" or "Can be used" for all timing sourcesof the ESO-1 3/PDH.

If any of the Mapping Table or Routing Table sets the timing signal to "Donot use" the corresponding ESO interface is switched off.

ESO-SDH The ESO-4/SDH operates in 2 principally different modes:

SETS locked mode

Non SETS locked mode

SETS locked mode In the SETS locked mode, the SETG of the SETS system provides the tim-ing signal for the ESO-4/SDH. The timing sources for the ESO-4/SDH arethe same as for the Select B.



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Figure 1-8: QL handling for the ESO-4 SDH outputSETS locked mode

Override QL by

Rout ing Table

Timing Source

Selection

SETS

ESO SETS locked

(Select B)

ESO-4

SDH

QLOutQLIn

Selected Source

QL based

selection

Priorit y based

selection

Do not use

Can be used

Unit ConfigurationNE Confi gurati on

Output Mapping

Table f or QL QLAdapt ed

from TimingSignal Sources

for SETS

Squelch (Do not use)

QLOutQL = 15

Do not squelch

(Can be used)

QLOutQLOut

Timing Signal is suppressed

for

- "Squelch" and

- "Do not use" respectively

Timing

signal

without QL

The Output Mapping Table for QL allows you to squelch (suppress) the tim-ing signal for selectable QL values. A squelched timing signal is suppressedand no longer available at the ESO interface.

The Routing Table suppresses the timing signal for the ESO depending onthe selected reference timing source. To this purpose, it is possible to con-figure the Routing Table "Do not use" or "Can be used" for all timing sourcesof the ESO-4/SDH.

If any of the Mapping Table or Routing Table sets the timing signal to "Donot use" the ESO-4/SDH interface is switched off.



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In the Non SETS locked mode, the ESO-4/SDH uses its own selector switch(Select A) for the selection of the timing signal. The Select A provides thesame timing sources as the Select B but the internal source. The selectionprocesses and parameters implemented for the Select A are the same as forthe Select B but without the holdover function and the free running mode.

Non SETS locked mode

Figure 1-9: QL handling for the ESO-4 SDH outputNon SETS locked mode


ESO SDHNon SETS locked(Select A)

ESO-4SDH

QLOutQLIn

QL basedselection


Unit ConfigurationNE Configuration

Output M appingTable for QL

QLAdapt ed

from TimingSignal Sourcesfor SETS

Squelch (Do not use)

QLOutQL = 15

Do not squelch(Can be used)

QLOutQLOut

Timing Signal is suppressedfor- "Squelch" ("Do not use")

Timing signalwithout QL

The Output Mapping Table for QL allows you to squelch (suppress) the tim-

ing signal for selectable QL values. A squelched timing signal is suppressedand is no longer available at the ESO-4/SDH interface.

Due to the individual selector switch for the Non SETS locked ESO-4/SDHthe function of the Output Routing Table becomes obsolete. The selectionswitch allows you to eliminate timing signals from sources not suitable forthe ESO-4/SDH.



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The FOX allows the simultaneous operation of timing sources and outputdevices that use traffic signals with SSI and SSM.

SSI/SSM processing andselection algorithms

This parallel processing of synchronisation status protocols creates specialcases for the QL-handling and the selection of timing sources when the pri-

ority based selection algorithm is selected.

Figure 1-10: QL processing for SSI/SSM inputs and timing source selec-tion for priority based selection algorithms

Input QL IN To Mapping Tablesand squelch

SSI SSM

StateInput

Selectedsource

QL SELECTED

SSI SSM

0 (0) - 15 Failed New S. 154) 1 QL SELECTED

3)

1 (15) - QL IN1)

Ok Input2)

QL IN 1 QL SELECTED3)

LOS - 15 Failed New S. 154) 1 QL SELECTED

3)

- 15 15 1) Ok Input 2) QL IN 0 QL SELECTED 3)

- 0 15 Ok Input2)


- 114 1141)

OK Input2)


- LOS 15 Failed New S. 154)

1 QL SELECTED3)

LOS Loss Of Signal

1) A fixed assigned QL or an input Mapping Table (where applicable) de-fine or change these QLs.

2) Input is selected if the priority based selection algorithm selects the

input as the highest priority timing source.3) The Output Mapping Tables (squelch for given QL) and Output Rout-

ing Tables (squelch for selected timing source) can override the QL

SELECTEDof the selected timing source and transmit an adapted QLwith the output signal.

4) It is possible to select a timing source with QL = 15.

If the selection algorithm for the NE timing source is QL based, the selectionof the timing source looks for the best QL level, which is at least the QL = 14of the internal source.



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Protection

Protection types In the block diagram shown in the paragraph "Clock frequency aspect of thetiming system" you can identify Workingand ProtectingUnits(thus 2 units)

for each of the SETS (Prime, Agent) and the PETS selection and controlsystems:

SETS Control and Selection

The protecting block is required to implement the SETS equipment pro-tection. Each SETS control block resides on a SYNI, SYNUF, SYN4Eor ATIOP unit.

You can implement SETS equipment protection independently for eachof the SBUS/ABUS sectors.

However, it is not possible to protect the Prime SETS Sector function withthe units of the Agent SETS Sector.

PETS Control and SelectionThe protecting block is required to implement PETS equipment protec-tion. Each PETS control block resides on a COBU control unit.

It becomes also evident that the redundancy of the ESIand ESOinter-facesalways requires equipment protection of the control unit.

The SETS/PETS equipment protection is system inherent and thus requires

no special configurationfor the timing systems but the implementation ofprotecting units.

SETS Protection SETS equipment protection requires the implementation of two

SYNIF/SYNIC/SYNUF/SYN4E units (SBUS) or two ATIOP units (ABUS) inpre-defined paired slotswithin the SBUS/ABUS sector:

The unit in the left slotof the SBUS/ABUS sector provides the working(master) SETS circuit which is active under regular operating conditions.

The unit in the right slotof the same SBUS/ABUS sector provides the

protecting (slave) SETS circuit.

You can implement SETS equipment protection for the Prime and/or theAgent SETS Sector (if applicable). The Prime and Agent Sectors can hostany mixtures of SBUS and ABUS (STM-4/1 interfaces provided).

The structure of the SBUS implies some rules for the slot allocationof the SYNIF/SYNIC/SYNUF/SYN4E and ATIOP units that shallprovide SETS equipment protection.

Normally, the working and the protecting SETS circuits are synchronised tothe same timing source. Both circuits thus provide identical timing signals forthe NE. However, only the timing signals of the active unit drive clock lines,while the outputs of the line drivers of the standby unit are high impedance.

Even if the synchronisation is a NE feature and is configured at the NE level,the unit with a SETS circuit provides the alarms for the failures of its SETScircuit. Consequently, both units normally generate the same SETS relatedalarms (if any) and there are no particular alarms for the SETS protectionfunction.



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For details on these alarms, refer to the user guides of the correspondingunits.

The following events can trigger a SETS switchover:

Figure 1-11: Events and switchover of the SETS circuit

SwitchoverEvent

UC C

Description

Failure of the SETScircuit

yes - One or more of the monitored internal clocksignals is/are missing.

Unit or circuit fail-ures

yes - Failure of the local microprocessor system(bootloader, ESW, clock and watchdogreset)

SETS Source out oflimits

- yes The SETS circuit produces a clock signalwith a frequency or phase shift that is/thatare out of the tolerated limits.

SETS not calibrated - - The internal reference frequency is notcalibrated or the corresponding entry in theinventory data block is corrupted.

No switchover. This condition initiates thedistribution of the QL (Quality Level) valueDNU (Do Not Use) with the timing signalswithin the SETS timing signal domain.

Manual - yes Command issued via the Timing SourcesStatus dialogue of the UCST.

Legend:

UC Unconditionalswitchover

The local clock drivers are shut down independently of whether a pro-tecting unit is available or not. If a protecting unit is available, it nowprovides the SETS function for the NE.

C Conditionalswitchover

If a protecting unit is available the local clock drivers are shut down toallow the protecting unit to take over the SETS function for the NE.

The switchover from the working to the protecting unit and vice

versa is not hitlessfor the internal clock signals and thus may af-fect the synchronisation and the traffic signals.

PETS Protection The equipment protection for the control unit provides at the same time thePETS equipment protection.

For details on the protection of the control unit, refer to the COBUX/COBUVUser Guide.



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The UCST provides status/maintenance functions for SETS/PETS protectionvia the

Status/Maintenance

Timing Sources Statusdialogues in the NE configuration menu that al-low you to control manually the activation of redundant SETS circuits

(NEs with COBUX and COBUV only). Boardlayer Status/Maintenance dialogues of the COBU that allow

you to manually control the operation of redundant control units and thusthe PETS timing system.

The block diagram that is shown in the paragraph "Clock frequency aspectof the timing system" indicates the interaction between the functional blocksof the timing system and the corresponding UCST dialogues.



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Selection of t iming sources

Timing sources for PETS The PETS system provides the following timing sources and internal clockbuses:

PDH-1 4which can provide timing signals from units with PBUS andUBUS access and corresponding traffic interfaces. The suitability of atraffic signal as timing source can depend on the interface operationmode and the extraction of the timing information (e.g. CES signals of theACONV). For details of this aspect, refer to the unit descriptions.

If the NE uses the synchronisation mode SETS only, the SETG provides

the timing signal for PETS via the PDH-3bus.

The UBUS units have access to the PDH-1 and 2 buses only. It is possi-ble to use the timing signals on these two buses for PETS and SETS.

The COBU provides the ESI-1 2/PDHinterfaces for external2048 kHz timing signals.

COBU internal PDH timing source

The PETS system can use the internal PDH timing source on theCOBU if there is no other timing source available.

This source has an accuracy of 50 ppm according to ITU-T G.703. It ispossible to assign a QL from 12 to 14 to the internal source.

Normally all timing sources of the PETS system provide a QL and a priority.

PETS selection algorithms The PETS system selects its reference timing source from among the avail-able timing signals with the criteria SF, QL and Priority in the following order:

1 SF (Signal Fail) for the timing source

2 QL (Quality Level) provided with the timing source

3 Priority of the timing source

This selection mode implies that all timing sources provide an appropriatepriority and QL value. Depending on the selected algorithm, the QL criterionis omitted for the selection of the reference source.

Selection via Priority

The PETS system selects the timing source with the highest priority. Ifthe selected source fails, the algorithm selects the source with the next

highest priority (available). If a source with a higher priority becomesavailable, the algorithm selects this source (revertive switching).

If the selected level of priority has more than one timing source, the algo-rithm selects any of the sources. In the case where the selected timingsource fails, another source of the same level of priority is selected (non-revertive switching).

The selection algorithm does not consider the QL criterion!

Selection via QL

The algorithm selects the timing source with the highest QL. If there aresignals with the same QL, the priorities assigned to the timing sourcesdecide on the selection.

The selection algorithm considers the QL and the Priority criterion!



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For details on source selection in systems with SSI and SSM timing sources,refer to the paragraph "SSI/SSM special" in the description of the QL-processing aspect of the timing system.

Clock Recovery The Clock Extractionprovides a filter with a selectable filter characteristic.A wide (low Q) or narrow (high Q) filter characteristic allows the adaptationfor a pre-defined jitter transfer function:

Low Q: Standard setting for multiplexer in public networks.

High Q: For multiplexers with interfaces to ONP.

For more information, refer to the COBUX/COBUV User Guide.

Timing sources for SETS The SETS system provides the following internal timing sources and clockbuses:

SDH-1 3which can provide timing signals from STM-4/1 trafficsources.

PDH-1 2which can provide timing signals from units with PBUS andUBUS access.

If the NE uses the synchronisation mode SETS only, the SETG provides

the timing signal for PETS via the PDH-3bus.

The COBU provides the ESI-1/SDHinterface for an external2048 kHz timing signal.

SYNI/SYNUF/SYN4E/ATIOP internal SDH timing source

The SETS system can use the internal SDH timing source on a unit with

an STM-4/1 interface (SYNI/SYNUF/SYN4E/ATIOP) if there is noother timing source available.

The internal timing source has an accuracy of 4.6 ppm. The internalsource has a fixed priority of 8 and a fixed QL of 11.

Normally all timing sources of the SETS system provide a QL and a priority.

It is possible to specify for each of the SETS timing sources a Hold-off andWTR (Wait To Restore) time:

Hold-offtime

The Hold-off time ensures that short (re-)activations of the SF (SignalFail) are not passed to the timing source selection process.

WTRtime

The WTR time ensures that the selection process only considers a previ-ously selected and failed timing source as available again if this sourceremains fault free for the WTR time.

The Hold-off and WTR time de-bounce the selection of timing sources if thesources provide temporary unstable timing signals.

SETS selection algorithms The SETS system selects its reference timing source from among the avail-able timing signals with the criteria SF, QL and Priority. The SETS systemuses the same selection processes as PETS. For more information, refer to

the paragraph "PETS selection algorithms".



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The following parameters and functions influence the selection process ofthe SETS system:

Hold-off and WTR time

Holdover circuit

For details on source selection in systems with SSI and SSM timing sources,refer to the paragraph "SSI/SSM special" in the description of the QL-processing aspect of the timing system.

Clock Recovery The SETS system does not provide configurable parameters for this func-tion.



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ESO timing signals

ESO-1 3/PDH The ESO-1 3/PDHprovide the clock signal of the PETS system. If theEquipment Timing Source is SETS only, the PETS system synchronises to

SETS as the only source and provides the clock for ESO-1 3/PDH.

ESO-4/SDH The ESO-4/SDHhas 2 modes of operation with significant differences for thetiming signal:

SETS lockedmode

The ESO-4/SDH provides a timing signal from the SETG clock recoverycircuit (via Select B). SETG reconditions the timing signal for the ESO-4/SDH.

Non SETS lockedmode

The ESO-4/SDH provides the timing signal from the selected timing

source (via Select A). The signal of this timing source is switched directlyto the ESO-4/SDH interface without clock recovery circuits or jitter recon-ditioning.

Reconditioning of the clock and elimination of jitter is required for timing sig-nals extracted at the end of a chain with serial timing provisioning via severalNEs. The Non SETS locked ESO-4/SDH allows external reconditioning ofthe extracted timing signal from an SDH interface and its feed back to theNE e.g. via ESI-1/SDH as a new synchronous timing reference.

Figure 1-12: Reconditioning of the SDH timingNon SETS locked mode

SelectA

SelectB

SETG(PLL)

SelectC

PDH-1 2

ESI-1/SDH

SDH-1 2

ESO-4/SDH

2 MHz

Internal

2 MHz

2 Mbit/s

STM-1

Squelch

Squelch

NE internal timing

Timing Sources

SETS

SBUS, STM-1

NESTM-1 IFunit

PDH IFunit

COBU

Clock Recovery&

JitterElimination

SASE

"High Quality" SDH Reference Clock

"Poor Quality"

SDH Clock

COBU

2 MHz

SASE Stand Alone Synchronisation Equipment

The "poor quality" SDH timing source (SDH or PDH) is input to the Select Awhich routes this clock via the Select C to the ESO-4/SDH. The externalSASE reconditions this clock signal and eliminates the jitter.



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The output of the SASE is a "high quality" SDH clock signal that the SASEfeeds to the ESI-1/SDH of the NE.

The NE selects the signal at its ESI-1/SDH as an SDH timing source withhigh priority and high QL for the SETG (via Select B).



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Selection of the equipment t iming source

To configure the NE timing system select the menu

NE ConfigurationTiming Sources.

The dialogue that pops up is context sensitive. This means that the dialogueprovides parameters and tabs for functional layers depending on

Availability of STM-4/1 interfaces

Synchronisation mode of the PETS system if STM-4/1 interfaces areavailable.

For an explanation of the functions and the relationship between the func-tions, refer to the previous paragraphs ("Overview of the NE timing system").The following paragraphs describe the configuration and parameters of thetiming system.

Please note that your NE should now contain all units that providetraffic signals or which contribute functions to the timing system ofthe NE.

The configuration of the units and subunits should correspond tothe final configuration, especially the configuration of the relevantparameters implied with synchronisation (SSM-, SSI-mode, Termi-nated etc.).

The menu File Print... allows you toprint the configuration of the timing system.

For more information on the print function and print samples, refer to UCST /

System Operation Basics User Guide.

NE without STM-4/1 inter-face(s)

The Timing Sources dialogue for NEs without STM-1 interface(s) has notabs for the functional layers of SETS or selections for related parameters.The default dialogue looks as follows:



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Figure 1-13: Timing Sourcessample dialogueNE without STM-4/1 interface(s)

The tab Traffic sourcesonly provides the

PDH clock buses PDH-1 4for the selection of traffic (timing) sources.

The other tabs allow the configuration of the PDH timing system (PETS,ESO-PDH, ESO-PDH QL).

The default value for all traffic (timing) sources is "Not used".

For details on the configuration of the PDH timing system, refer to the de-scriptions "Configuration of the PETS system".

NE with STM-4/1 inter-face(s)

The Timing Sources dialogue for NEs with STM-4/1 interface(s) providestabs for the functional layers of SETS, PETS and related parameters. Thedefault dialogue looks as follows:



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Figure 1-14: Timing Sourcessample dialogue for SETS and PETSNE with STM-4/1 interface(s)

The tab Traffic sourcesprovides the

SDH clock buses SDH-1 3

PDH clock buses PDH-1 4

for the selection of traffic (timing) sources.

The other tabs allow the configuration of the SDH timing system (SETS,ESO-SDH, ESO-SDH QL) and the PDH timing system (PETS, ESO-PDH,ESO-PDH QL).

The default value for all traffic (timing) sources is "Not used".

The first step of configuration for a timing system with SETS is the definitionof the Equipment Timing Source. This selection decides whether your NEhas independent timing systems for PETS and SETS or not.

Select SETS and PETS from the Equipment TimingSourcefield in the dialogue if youneed independent PDH and SDHtiming systems (refer to the dia-logue above).

or select SETS only from the Equipment TimingSourcefield in the dialogue if youwant to lock the PDH timing sys-tem to the SDH timing system (re-fer to the dialogue below).



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Figure 1-15: Timing Sourcessample dialogue for SETS onlyNE with SYNIF STM-1 interface

Since this selection of the Equipment Timing Sourcemode is theleading parameter for the NE synchronisation, a later changemodifies automatically the configuration of your timing system.

You lose parts of your configuration if you switch back and forwardbetween the settings!



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User Guide FOX Synchronisation (R8) Configuration of the PETS system

2Configuration of the PETS system

The following paragraphs describe the configuration of the PETS system inan NE that has

STM-4/1 interface(s)

Equipment Timing Source parameter: SETS and PETS.

The configuration of PETS in an NE without STM-4/1 interface(s) is identicalfor the PETS part. However, the context suppresses all SETS relevant pa-rameters and functional layers in the dialogue.

Traffic (timing) sources

The PETS system uses 3 types of timing sources


ESI-PDH timing signal inputs

Internal timing source

This paragraph describes the allocation of the Traffic (timing) sources for thePETS system. The other timing sources do not require such an allocation.

Select the menu NE ConfigurationTiming Sources.

A dialogue as shown in the previ-ous paragraph pops up.

Select the tab Traffic Sources if not already selected.

Select from the Unit/SubUnit combo boxes that belong to thelines assigned to the TrafficSources PDH-1 4.The combo boxes display all avail-

able timing sources for the se-lected Traffic Source as a list of .



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Configuration of the PETS system User Guide FOX Synchronisation (R8)

Figure 2-1: Timing Sources / Traffic Sourcessample dialogueNE with STM-4/1 interface(s)

Please note that:

It only is possible to allocate UBUS units (such as the MEGIF)to the Traffic Sources PDH-1 and 2 but notto the TrafficSources PDH-3 and 4!

You can allocate the PBUS units to the Traffic Sources

PDH-1 4.

It is not possible to use the UNIDA and DATA subunits (n x64 kbit/s etc.) as Traffic Sources!

You must allocate the Units/Subunits that you need for thePETS and the SETS system to the Traffic Sources PDH-1 and2 since these sources are available for the SETS and the PETSsystem.

It is not recommendedto use the SYNAC subunits as PETStraffic sources!

The dialogue below shows the allocation of the PETS Traffic Sources.



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The allocation of the SDH-1 3 Traffic Sources is part of the configurationof the SETS system.



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Selection algorithm and clock extraction

Timing sources and pa-rameters

The selection algorithm for PETS requires that each PETS timing source has

Priority

Quality Level QL

This and the following paragraphs describe the allocation of these parame-ters to the timing sources of the PETS system.


Select the tab PETSif not already selected.

Figure 2-3: Timing Sources / PETSsample dialogueNE with STM-4/1 interface(s)

The dialogue displays a line for each timing source of the PETS system. Thelines with the traffic (timing) sources appear only if allocated previously.

With the exception of the Internal source all the timing sources are disabled(column Priority). It is not possible to disable the internal timing source.

Assign a Priority to each of the sources:- Highest priority: 1

- Lowest priority: 7



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It is possible to assign the samepriority to more than one source.Disable sources that cannot con-tribute to synchronisation.

Define the Quality Level handling for each of the sources:- QL as received with source- Assign a QL

For sources providing a QL valuethe parameter is normally set to:

Received (= default)

For timing sources that provide noQL or if you want to fix the QL for asource assign a QL.- Highest QL: 1- Lowest QL: 14.

The use of some of the QL values is standardised (according to

ITU-T G.704 for PETS and ITU-T G.707 for SETS).

The dialogue below shows a sample of fully configured PETS timing sources.

Figure 2-4: Timing Sources / PETSsample dialogueNE with STM-4/1 interface(s)



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If you want to use exclusively the selection algorithm Priority Table based,you do not need to configure the QL part for the traffic sources.

Please note that:

It is not possible to assign 15 as a QL. This is because a QL =

15 means for the system "Do not use" the timing source.

If the SSM function of a unit is not active (e.g. Sa mode = SSIG.704 for LOMIF), it is not possible to set the QL to "Received".

The MEGIF cannot handle SSM. It is not possible to set the QLto "Received".

The ESI-1 2/PDH provide parameter ranges as follows:

Priorities: 1 6

QLs: 1 14

Internal/PDH provides parameter ranges as follows:

Priorities: 1 7 QLs: 12, 13 and 14

Selection Algorithm Select the menu NE Configuration Timing Sources.

Select the tab PETS if not already selected.

Tag the box Priority Table basedin the field Selection Algori thmtomake the PETS selection prioritytable based (the selection algo-rithm disregards the QLs).

or tag the box Quality Level based to make the PETSselection QLbased (the selection algorithmconsiders first the QL and then thePriority!).

Please note that:

If some timing sources forward their QL as Received and oth-ers sources have assigned QLs, make sure that the assignedQLs do not always prime the received QLs.

If each timing source in a QL based source selection systemhas an assigned QL, the selection algorithm corresponds to a14 level priority scheme.

The definition of the PETS selection algorithm as described above requiresone of the following basic conditions for the NE timing system:

NE with PDH equipment only (no STM-4/1 interfaces)

Equipment Timing Source: SETS and PETS

The PETS systems requires no selection algorithm in the case of the Equip-ment Timing Source SETS only(PETS locked to SETS) because the SETSsystem provides the one and only timing source for the PETS system.

The dialogue below illustrates this fact:



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Figure 2-5: Timing Sources / Traffic Sourcessample dialogueNE with STM-4/1 interface(s)SETS only (PETS locked to SETS)

The dialogue does not provide the functional layer for PETS (tab PETS) andthe corresponding parameters. However, the functional layers for the ESO-PDH (Routing Tables) and the ESO-PDH QL (Squelch Functions) are stillavailable. It is possible to configure all the parameters of these functionallayers.

The PDH-3 traffic source locks the PETS system to the SETS timing signal .

Clock Extraction Select the menu NE Configuration Timing Sources.

Select the tab PETSif not already selected.

Tag the box Low Q for a wide band clock recovery.This is the standard setting.

or tag the box High Q for narrow band clock recovery.

This setting is used for NEs withinterfaces to ONP networks.

For detailed information on these filters and the clock recovery, refer toCOBUX 212, 213, 219, 223 & COBUV 217, 218, 220, 224 User Guide.



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ESO-PDH

Routing Table The Routing Table for the ESO-PDH defines whether the output provides itstiming signal depending on the selected timing source.


Select the tab ESO-PDH if not already selected.

Figure 2-6: Timing Sources / ESO-PDHsample dialogueNE with STM-4/1 interface(s)

The default value for all ESO-PDH and timing sources is "Can be used".

Tag the combo box in the column allocated to the ESOand in the line allocated to the tim-ing source for which you want tochange the parameter.

Select Do not use in the combo box for the outputsyou want to become inactiveinthe case where the correspondingtiming source is selected.

or select Can be used in the combo box for the outputs

you want to remain activein thecase where the corresponding tim-ing source is selected.



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The Squelch Function for the ESO-PDH QL defines whether the ESO trans-mits its timing signal or not depending on the QL of the selected timingsource.

Signal squelch


Select the tab ESO-PDH QL if not already selected.

Figure 2-7: Timing Sources / ESO-PDH QLsample dialogueNE with STM-4/1 interface(s)

The default value for all ESO-PDH QL is "Not squelched".

Tag the box in the column allocated to the QLand in the line allocated to theESO for which you want to changethe parameter.

The tagging toggles the setting be-tween timing signal Squelched =[]andNot Squelched = [ ].

Press [OK] to apply your new configuration

and quit to the main menu.

[Cancel] to disregard all the changes ofyour configuration and quit to themain menu.



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User Guide FOX Synchronisation (R8) Configuration of the SETS system

3Configuration of the SETS system

The following paragraphs describe the configuration of the SETS system inan NE with STM-4/1 interface(s).

Please note that the SBUS/ABUS sector in which you have config-ured your fi rst SYNI/SYNUF/SYN4E/ATIOPunit becomes ir-revocably the Prime SETS Sector.

If you want to change this allocation, you must delete all theSYNI/SYNUF/SYN4E/ATIOP units from your configurationand restart the configuration by configuring the firstSYNI/SYNUF/SYN4E/ATIOP in the SBUS/ABUS sectorthat should become the Prime SETS Sector.

You can control the assignment of the Prime SETS Sector un-der the SETStab in the Timing Sourcesdialogue.



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Configuration of the SETS system User Guide FOX Synchronisation (R8)

Traffic sources

The SETS system uses 3 types of timing sources


ESI-SDH timing signal input

Internal timing source

This paragraph describes the allocation of the Traffic (timing) sources for theSETS system. The other timing sources do not require such an allocation.


Select the tab Traffic Sources if not already selected.

A dialogue that may show no con-figuration or a configuration forPETS pops up.

Figure 3-1: Timing Sources / Traffic Sourcessample dialogueNE with STM-4/1 interface(s)before the configuration of the SDH- sources

The SETS system allows the allocation of Traffic Sources for the sources

SDH-1 3

The SETS system uses these sources exclusively. It is not possible touse these sources for the PETS system. The only possible sources areSTM-4 and STM-1 interfaces.

PDH-1 and 2

The SETS and the PETS system share these sources. It is possible thatthese sources are already allocated to Traffic Sources for the PETS sys-tem (configured with the PETS system).

To allocate Traffic Sources



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select from the Unit/SubUnit combo boxes that belong to thelines assigned to the TrafficSources SDH-1 3.The combo boxes display all avail-able timing sources for the se-

lected Traffic Source as a list of .

and if applicable Unit/SubUnit combo boxes that belong to thelines assigned to the TrafficSources PDH-1 2.The combo boxes display all avail-able timing sources for the se-lected Traffic Source as a list of .


when configuring the SDH- sources

Remark:The "SYNAC Termination-2" in the dialogue above is not part of the

SDH-1 timing source selection but is the selected timing source for PDH-2.

Please note that:

It only is possible to allocate UBUS units (such as the MEGIF)to the Traffic Sources PDH-1 and 2 but notto the TrafficSources PDH-3 and 4!

You can allocate the PBUS units to the Traffic Sources PDH-1 4.

It is not possible to use the UNIDA and DATA subunits (n x64 kbit/s etc.) as Traffic Sources!

You must allocate the Units/Subunits that you need for the

PETS and the SETS system to the Traffic Sources PDH-1 and



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2 since these sources are available for the SETS and the PETSsystem.

The dialogue shows the integrity of the SETS system: There isonly 1 SETS systemfor all the SDH units in the 2 SBUS/ABUS

sectorsof the FOX515.

Do not use SYNACsubunits as SETS traffic sources!

The dialogue below shows a typical allocation for the SETS (and PETS)Traffic Sources.




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Selection algorithm and clock extraction


The selection algorithm for SETS requires that each SETS timing source has a

Priority

Quality Level QL

This and the following paragraphs describe the allocation of these and otherparameters to the timing sources of the SETS system.


Select the tab SETSif not already selected.

Figure 3-4: Timing Sources / SETSsample dialogueNE with STM-4/1 interface(s)

The dialogue displays a line for each timing source of the SETS system. Thelines with the traffic (timing) sources appear only if allocated previously.

The right hand status field at the bottom of the dialogue indicateswhich of the 2 SBUS/ABUS sectors is the Prime SETS Sector(here the left hand sector).



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With the exception of the Internal source all the timing sources are disabled(column Priority). It is not possibleto disable the internal timing source orto change its priority.

Assign a Priority to each of the sources:

- Highest priority: 1- Lowest priority: 7

It is possible to assign the samepriority to more than one source.Disable sources that cannot con-tribute to synchronisation.

Define the Quality Level handling for each of the sources:- QL as received with source- Assign a QL

For sources providing a QL valuethe parameter is normally set to:Received (= default)

For timing sources that provide noQL or if you want to fix the QL for asource assign a QL.- Highest QL: 1- Lowest QL: 14.

The use of some of the QL valuesis standardised.

Select the Hold-off Time for each of the sources:- Range: 0 60 s- Default value: 0 s

It is not possible to assign a Hold-off Time for Internal.

Select the WTR Time for each of the sources:- Range: 0 720 s- Default value: 30 s

It is not possible to assign a WTRTime for Internal.

The dialogue below shows a sample of fully configured SETS timingsources.



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Figure 3-5: Timing Sources / SETSsample dialogueNE with STM-4/1 interface(s)

The above given values for the Hold-off and WTR times are provenvalues for practical use. The UCST offers these values in thecombo boxes.

The UCST allows you to edit the selected value in the combo boxand select values as follows:

Hold-off time: n x 100 ms (0, 0.1, 0.2 59.9, 60.0 s)

WTR time: n x 1 s (0, 1, 2 719, 720 s)

These ranges largely include the requirements of the EN 300 417-6-1 standard.

If you want to use exclusively the selection algorithm Priority Table based,you do not need to configure the QL part for the traffic sources.

Please note that:

It is not possible to assign 15 as a QL. This is because a QL =15 means for the system "Do not use" the timing source.



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If the SSM function of a unit is not active (e.g. no SSM on theMS layer of the SYNI/ATIOP), it is not possible to set theQL to "Received".

The MEGIF cannot handle SSM. It is not possible to set the QL

to "Received".

The ESI-1/SDH provides parameter ranges as follows:

Priorities: 1 7

QLs: 1 14

Internal/SDH provides fixed parameters as follows:

Priority: 8

QL: 11


Select the tab SETS if not already selected.Tag the box Priority Table basedin the field Selection Algori thmto

make the SETS selection prioritytable based (the selection algo-rithm disregards the QLs).

or tag the box Quality Level based to make the SETSselection QLbased (the selection algorithm firstconsiders the QL and then the Pri-ority!).

Please note that:

If some timing sources forward their QL as Received and oth-

ers sources have assigned QLs, make sure that the assignedQLs do not always prime the received QLs.

If each timing source in a QL based source selection systemhas an assigned QL, the selection algorithm corresponds to a14 level priority scheme.



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ESO-SDH (Non SETS locked mode)

The configuration of the ESO-SDH parameters depends on the selectorswitch that provides a timing signal for the ESO-SDH. The paragraph below

describes the configuration for the ESO-SDH in the Non SETS lockedmode(timing signal via the Select A).


From the field ESO-SDH select the parameter non SETSlockedif not already selected.


In this mode, the functional layer ESO-SDH provides the same functions forthe selection of a timing source as the SETS functional layer.


The selection algorithm for the ESO-SDH requires that each timing sourcehas a

Priority

Quality Level QL


Select the tab ESO-SDH if not already selected.



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Figure 3-7: Timing Sources / ESO-SDHsample dialogueNE with STM-4/1 interface(s)ESO-SDH non SETS locked

The dialogue displays a line for each timing source of the SETS system. Thelines with the traffic (timing) sources appear only if allocated previously. In-ternal is not available as a timing source for the ESO-SDH.

For the configuration and parameters, refer to the corresponding paragraphs

for the functional layer SETS.

The dialogue below shows a sample of fully configured SETS timingsources.



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Figure 3-8: Timing Sources / ESO-SDHsample dialogueNE with STM-4/1 interface(s)ESO-SDH non SETS locked



For the configuration and parameters, refer to the corresponding paragraphsfor the SETS functional layer.



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The Squelch Function for the ESO-SDH QL defines whether the ESO trans-mits its timing signal depending on the QL of the selected timing source.

Signal squelch


Select the tab ESO-SDH QL if not already selected.

Figure 3-9: Timing Sources / ESO-SDH QLsample dialogueNE with STM-4/1 interface(s)ESO-SDH non SETS locked

The default value for all ESO-SDH QL "Not squelched".

Tag the box in the column allocated to the QLand in the line allocated to theESO for which you want to changethe parameter.

The tagging toggles the setting be-tween timing signal Squelched =[]andNot Squelched = [ ].

Press [OK] to apply your new configuration

and quit to the main menu.




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ESO-SDH (SETS locked mode)

The configuration of the ESO-SDH parameters depends on the selectorswitch that provides a timing signal for the ESO-SDH. The paragraph below

describes the configuration for the ESO-SDH in the SETS locked mode(timing signal via the Select B).


From the field ESO-SDH select the parameter SETS lockedif not already selected.


In this mode, the functional layer ESO-SDH provides a Routing Table for theESO-4/SDH.



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The Routing Table for the ESO-SDH defines whether the output provides itstiming signal depending on the selected timing source.

Routing Table



Figure 3-11: Timing Sources / ESO-PDHsample dialogueNE with STM-4/1 interface(s)ESO-SDH SETS locked

The default value for all timing sources of the ESO-4/SDH and is "Can beused".

Tag the combo box in the line allocated to the timingsource for which you want tochange the parameter.

Select Do not use in the combo box for the outputs

you want to become inactiveifthe corresponding timing source isselected.

or select Can be used in the combo box for the outputs

you want to remain activeif thecorresponding timing source is se-lected.

Press [OK] to apply your new configurationand quit to the main menu.




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The Squelch Function for the ESO-SDH QL defines whether the ESO-4/SDHtransmits its timing signal or not depending on the QL of the selected timingsource.

Signal squelch


Select the tab ESO-SDH QL if not already selected.

The parameters are identical to the parameters of the ESO-SDH in the NonSETS locked mode. For the configuration and parameters, refer to the cor-responding paragraphs for the ESO-SDH in the Non SETS locked mode.



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User Guide FOX Synchronisation (R8) Routing and mapping tables of units

4Routing and mapping tables of units

Application

The routing and mapping tables for traffic signals belong to the unit level.Since both functions are a part of the overall NE timing system, the following

paragraphs provide some basic information on the configuration of thesefunctions in the units.

The availability of the routing and mapping tables depends on the unit andthe traffic signal (SSM, SSI, none).



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Routing and mapping tables of units User Guide FOX Synchronisation (R8)

LOMIF type E12/P12 traff ic signal layer

The LOMIF type E12/P12 traffic layer is used in most traffic units with E12interfaces and/or P12 functionality. This implementation of the E12/P12 traf-

fic layer is generic for the FOX and the corresponding traffic units.Depending on the P12- and the Sa-mode the LOMIF type E12/P12 trafficlayers provide

SSM, SSI or none

Routing Table

For details on these functions and corresponding parameters, refer to thecorresponding traffic unit descriptions/user guides or LOMIF 158, 152 & LOMI4159, 151 User Guide.

Select menu Unit ConfigurationParameters to open the Unit Configuration

Parameters dialogue

Figure 4-1: LOMIF: Unit Configuration Parameterssample dialogue

Select Sa mode and configure SSI, SSM G.704 or a NT1 mode.

Press [ ] in the column Routing tablein theline allocated to the subunit youwant to configure.

The PDH Routing Tabledialoguepops up.



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User Guide FOX Synchronisation (R8) Routing and mapping tables of units

Figure 4-2: E12/P12: PDH Routing Tablesample dialogue

The Routing Table allows you to define for each PDH timing source, whatsynchronisation information the traffic signal leaving the subunit (2 Mbit/s

traffic signal layer) carries when a particular timing source becomes active.Accordingly, it is possible to sel

Documents

Abb Fox Synchronisation r8 Rc 1khw002008