OptiX RTN 600 Networking and Protection [Compatibility Mode]

OptiX RTN 600 Networking and Protection

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Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

Study Guide

� Before the study on this course, you are supposed to:

� Complete the study on the Digital Microwave Communications

Principles or have the relevant knowledge.

� Complete the study on the course OptiX RTN 600 Introduction.

Have the general networking knowledge of the SDH optical

Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved. Page 1

� Have the general networking knowledge of the SDH optical

transmission network.

References

� OptiX RTN 600 Product Description and OptiX RTN 600

Hardware Description in the OptiX RTN 600 Package of

Documents

� Digital Microwave Communications Principles


Training Purpose

� Upon completion of this course, you will be able to:

� Describe the network application of the OptiX RTN 600.

� List the common networking modes of the OptiX RTN 600.

� List the service types and protection schemes supported by the OptiX


RTN 600.

� Describe the configuration requirements of the OptiX RTN 600 on

each protection scheme.

Table of Contents

1. Network Applications and Networking Modes of the

OptiX RTN 600

2. Service Protection and Equipment Protection Schemes of

the OptiX RTN 600


Network Application

� The OptiX RTN 600 radio transmission system is a short haul

digital microwave transmission system. Each radio frequency (RF)

carrier of the RTN 600 system can transmit 4/8/16xE1 or 1xSTM-1

on the 7 GHz-38 GHz RF band.

The system provides multiple service interfaces, and it can be


� The system provides multiple service interfaces, and it can be

flexibly configured and easily installed. It can form the

transmission network with the optical transmission equipment at

the access layer, and can also provide backhaul links in a mobile

telecommunication network or a private network.

Microwave Station Type� Classified by Station Type

� Terminal station: It refers to the microwave station that transmits services only in one

direction.

� Relay station: It refers to the microwave station that transmits services in two directions

and is required added to solve the problem existing in the microwave line of sight

communication. The relay station is classified into two types, active relay station and

passive relay station.

� Add/Drop relay station: It refers to the microwave station that transmits services in two

directions and adds/drops transmitted services.


directions and adds/drops transmitted services.

� Pivotal station: It refers to the microwave station that transmits services in three or

more than three directions and transfers the services in transmission channels in

different directions. It is also called the HUB station.

� Classified by Transmit and Receive Frequency

� Primary station: the transmit frequency is higher than the receive frequency, also

named high station.

� Non-primary station: the transmit frequency is lower than the receive frequency, also

named low station.

Microwave Station Type (cont.)

Terminal station

Relay station

Relay station


f 1’

Terminal station

Pivotal station

Terminal station

Primary station

Non-primary station

f 1

f 1’

The Primary station and the Non-primary station are usually arranged alternately in the double-frequency radio link.

Primary station

f 1 > f 1’

f 1

Microwave Station Type (cont.)� Typical configuration of the OptiX RTN 600 as the Terminal

Station

SL1 slot3

PXC slot1

IF1A slot4

SCC slot2

slot

20 PXC slot3

PXC slot1

PH1 slot4

SCC slot2

IF1A slot7

IF1A slot5

slot8

slot6


� Typical Configuration of the OptiX RTN 600 as the Relay Station

slot

20 PXC slot3

PXC slot1

PH1 slot4

SCC slot2

IF1A slot7

IF1A slot5

slot8

SL1 slot6

SLE slot3

PXC slot1

IF1A slot4

SCC slot2

SLE slot3

PXC slot1

IF1A slot4

SCC slot2

Cable

Microwave Station Type (cont.)

� Typical Configuration of the OptiX RTN 600 as the Pivotal station

slot

20 PXC slot3

PXC slot1

PH1 slot4

SCC slot2

IF1A slot7

IF1A slot5

IF1A slot8

SD1 slot6


PXC slot1 SCC slot2

slot

20 PXC slot3

PXC slot1

PH1 slot4

SCC slot2

IF1A slot7

IF1A slot5

IF1A slot8

IF1A slot6

Microwave Network Topology

� The following figures show the basic topologies of the microwave

network.

Ring

network

Chain

network


Star

network

Tree

network

Applications of the OptiX RTN 600

� Applications in the Backhaul Network of the Mobile Base Station

� Terminal station in the mobile backhaul network

� Mobile backhaul chain network

� Mobile backhaul tree network

� Applications in the Access Network and Private Network


� Applications in the Access Network and Private Network

� Microwave access network

� Complementary network to the SDH ring network

� Ring network formed by microwave equipment and SDH equipment

� Ring network purely formed by microwave equipment

Applications of the OptiX RTN 600 (cont.)

� Applications in the Backhaul Network of the Mobile Base Station

Mobile backhaul chain network


Terminal station in the mobile

backhaul networkMobile backhaul tree

network


� Microwave Access Network

Business


VIP client

Service center

Businesscenter

Other client


� Complementary Network to the SDH Ring Network


Radio link


� Ring Network Formed by Microwave Equipment and SDH Equipment

User network

User network

User network


User network

User network

User network

User network

Transmission network


� Ring Network Purely Formed by Microwave Equipment

User network

User network

User network


User network

User network

User network

User network

Transmission network

Questions

� How many microwave station types can be configured on the

OptiX RTN 600? What are them?

� Does an OptiX RTN 610 can be set as relay station? Why?


� List out four applications of the OptiX RTN 600 in the transmission

network.

Table of Contents

1. Network Applications and Networking Modes of the

OptiX RTN 600

2. Service Protection and Equipment Protection

Schemes of the OptiX RTN 600


Service Protection and Equipment Protection Schemes of the OptiX RTN 600� The service protection and equipment protection schemes

provided the OptiX RTN 600 are as follows:

� 1+1 Hot Stand By (HSB) protection

� Microwave 1+1 Space Diversity (SD) protection


� Microwave 1+1 Frequency Diversity (FD) protection

� Sub-network connection protection (SNCP)

� Cross-connect and clock unit (PXC) active/standby protection

1+1 HSB Protection

Standby

Main

Service access

unitCross-connect

unit

IF unit ODU

• In the normal state

• The microwave HSB protection is also called the hot standby protection.

Antenna


Standby

ODU

(mute)

Standby

Main

Cross-connect

unit

ODU

(mute)

ODU

Antenna

• In the switching state

Service access

unit

IF unit

IF unit

IF unit

1+1 HSB Protection (cont.)

� The 1+1 HSB protection can provide protection for the equipment when

the IF board or the ODU failed.

� The conditions triggering the 1+1 HSB protection switching include the

hardware fault of the IF unit, the hardware fault of the ODU, R_LOS,

MW_LOF, R_LOC, R_LOF and MW_RDI.

The service interruption time of the 1+1 HSB protection switching is less


� The service interruption time of the 1+1 HSB protection switching is less

than 1s.

� Only the OptiX RTN 620 supports the 1+1 HSB protection.

� The ODU must use the same sub-band and type of the Primary and Non-

primary stations.

� Only one antenna need be used at one station.

� Two IF boards need not be configured in the paired slots.

1+1 SD Protection

Standby

Main

Service access

unitCross-connect

unit

ODU

ODU

(mute)

• In the normal stateIF unit

Antenna

Antenna


Standby

Main

ODU

ODU

(mute)


Service access

unitCross-connect

unit

IF unit

IF unit

IF unit

Antenna

Antenna

1+1 SD Protection (cont.)

� Because of the multi-path fading, the 1+1 SD installing the main and

standby antennas in different positions to protect the transmission

channel.

� The conditions triggering the 1+1 SD protection switching include

MW_LOF, R_LOS, R_LOC, R_LOF, MW_FECUNCOR, and B1_SD

(when the IF working mode is the PDH)/B2_SD (when the IF working


mode is the SDH).

� The 1+1 SD protection switching does not affect the services.

� Only the OptiX RTN 620 supports the 1+1 SD protection.

� The ODU must use the same sub-band and type of the Primary and Non-

primary stations.

� Two antennas must be used at one station.

� Two IF boards must be configured in the paired slots.

1+1 FD Protection


Standby

Main

Service access

unit

Cross-connect

unit

ODU

Antenna

IF unit f1

f2

ODU



Standby

Main IF unit

IF unit

f1

f2

Cross-connect

unit

Service access

unitAntenna

ODU

ODU

IF unit

1+1 FD Protection (cont.)

� The 1+1 FD uses the fading feature diversities between the signals of different

frequencies in the space transmission to protect the active and standby

channels in the microwave transmission.

� The conditions triggering the 1+1 FD protection switching include MW_LOF,

R_LOS, R_LOC, R_LOF, MW_FECUNCR, B1_SD (when the IF working mode

is the PDH), and B2_SD (when the IF working mode is SDH).


is the PDH), and B2_SD (when the IF working mode is SDH).

� The 1+1 FD protection switching does not affect the services.

� Only the OptiX RTN 620 supports the 1+1 FD protection.

� The ODU must use different sub-bands and types at the same station.

� Two or one antenna (the hybrid coupler must be used) can be used at one

station.

� Two IF boards must be configured in the paired slots.

Summary of the Microwave Protection Schemes

Protection

Scheme

Configuration Requirement Switching Condition Service

Interruption

Switching

Point

1+1 HSB � In general, one antenna is

used.

� There is no special

requirement on the paired slot.

� The sub-band of the main and

standby ODUs must be the

same.

Hardware fault of the IF unit and

ODU unit, MW_LOF, R_LOS,

R_LOC, R_LOF and MW_RDI

The service

interruption

time is less

than 1s.

Cross-

connect

unit


1+1 SD � Two antennas must be used.

� There is the requirement on

the paired slot.


standby ODUs must be the

same.

The conditions triggering the 1+1

SD protection switching is the

service fault.

In this case, the MW_LOF,

R_LOS, R_LOC, and R_LOF are

not counted as the conditions

triggering the HSB switching.

The

services are

not

interrupted.

IF unit

1+1 FD � One or two antennas can be

used.

� There is the requirement on

the paired slot.


standby ODUs should be

different.

The condition triggering the 1+1

FD protection switching is the

service fault.

In this case, the MW_LOF,

R_LOS, R_LOC, and R_LOF are

not counted as the conditions

triggering the HSB switching.

The

services are

not

interrupted.

IF unit

SNCP

� SNCP stands for the sub-network connection protection. The protection is performed when the

signal fail or are degraded. SNCP adopts the 1+1 single-end switching and does not require

the support of the protocol.

� The conditions triggering the higher order SNCP include R_LOS、R_LOF、MW_LOF、

MW_LIM、MS_AIS、B2_EXC、R_LOC 、AU_AIS、AU_LOP 、HP_LOM . The optional

conditions triggering the higher order SNCP include HP_TIM, HP_UNEQ, B3_EXC and B3_SD.

� The required conditions triggering the lower order SNCP include the TU_AIS and TU_LOP.

The optional conditions triggering the lower order SNCP include the LP_TIM, LP_UNEQ,


The optional conditions triggering the lower order SNCP include the LP_TIM, LP_UNEQ,

LP_SLM, BIP_EXC, and BIP_SD.

� The service interruption time in the SNCP switching is less than 50 ms.

� The source board in an SNCP pair must be the line board or the IF board.

� If the IF board is configured in one 1+1 protection group, it cannot be configured as the source

board of one SNCP pair.

SNCP (cont.)

A

� The SNCP is shown in the following figure. Services are transmitted bidirectionally at

NE A. The path that passes through NE B is the active path. The path that passes

through NE D is the standby path.

� In the normal state, NE C selectively receives the services from the active path.

� In the switching state, NE C selectively receives the services from the standby

path.


Active Standby

Selective receiving of services

Bidirectional transmission of servicesB

C

D

PXC Active/Standby Protection

� In the normal state, the active and standby PXC work in the hot standby mode.

When the active unit is abnormal, the standby unit replace the original active one

to providing the cross-connect and clock functions to the entire system.

� The conditions triggering the PXC active/standby protection include the loss of the

38M system clock and the hardware failure.

� The conditions triggering the situation that the service unit selects the PXC


� The conditions triggering the situation that the service unit selects the PXC

include loss of the system clock, loss of the service frame header, loss of the

overhead clock, and loss of the overhead frame header.

� The service interruption time in the PXC active/standby switching within 50 ms.

� Only the OptiX RTN 620 supports the PXC active/standby protection. When the

slots 1 and 3 are both configured with the cross-connect and clock board PXC, this

protection is automatically enabled.

PXC Active/Standby Protection (cont.)

Cross-

connect

and clock

unit

1

Service Service signal and


1

• In the switching state Cross-

connect

and clock

unit

Service signal and

clock signal


Service

unit

3

Service signal and

clock signal Clock

signal

3

Service

unit

Cross-

connect

and clock

unit

Clock

signal

Cross-

connect

and clock

unit

clock signal

Summary

� Service and Equipment Protection Schemes Supported by

the OptiX RTN 600

� 1+1 HSB protection

� 1+1 SD protection


� 1+1 FD protection

� SNCP protection

� Cross-connect and clock unit 1+1 hot standby

Thank You

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Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

www.huawei.com