OTA101103 OptiX Metro series Equipment Networking and Applic.ppt

HUAWEI TECHNOLOGIES CO., LTD.

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OTA101103 OptiX Metro series Equipment Networking

and Application

ISSUE 1.00

HUAWEI TECHNOLOGIES CO., LTD. Page 2All rights reserved

On completion of this course, the participants

will be able to:

Understand the basic SDH networks and

basic SDH network elements

Understand the common survivable

networks and synchronization


Network Topologies

What does a Network Topology

consist of?

Network Elements

Transmission Lines

Importance of Network Topology

Availability of Channels

Reliability of Network

Efficiency of Network


Chapter 1 Networking of Metro 100Chapter 1 Networking of Metro 100



Networking of Metro 100

STM-1 Chain

STM-1 Ring

STM-1 Chain with

Metro 1000

OptiX Metro 100

OptiX Metro 1000 / OSN Series



OptiX Metro 100 Other vendor’s NEs OptiX Metro 100

D1-D3 D4-D12 D1-D3

Other vendor’s NMST2000 NMS



OSI DCN OptiX RingLAN(OSI)

T2000

Metro 100 NM information can be transmitted by OSI over DCC



OSI DCN

T2000

OptiX RingOther Vender'sRing

LAN

DCC

OSI DCN OptiX Ring Other Vender's

Ring

LAN

DCCOther Vender's

EMS


Protection Topology of Metro 100

Chain (non-protection)

SNCP (SubNetwork Connection Protection)


SubNetwork Connection Protection

Description:

Protection one SubNetwork Connection

Can be adapted to all networks

SNC Starting

Node

SNC Termination Node

ProtectionSNC

WorkingSNC

Sub-network 1

Sub-network 2

NE A NE B

Selector

123

123


SubNetwork Connection Protection Protection principle

Concurrent sending (transmit end)

Selective receiving (receive end)

A

B

C

D

in

out

out

out

out

out

out

out

out

in

in

in

in

in

in

inSNCP Ring

E1

E1

STM-N

Sub-network 1

Sub-network 2



Protection switch triggers:

Default

− R-LOS, R-LOF, MS-AIS, B2-EXC, AU-LOP, AU-AIS, TU-

AIS, TU-LOP, HP-LOM, HP-UNEQ, B3-EXC, Unplug the

correspond line card

Optional

− B2-SD, HP-TIM, B3-SD



Protection Restoration:

Restoration time - 10 minutes (provisionable in the range of

5-12 minutes)

A

B

C

D

switch

S1

P1A

B

C

D

S1

P1


SNCP services grouping

If there are too much SNCP services in one node, switch

completion time probably will be more than 50ms

Method to solve the problem: grouping

Make all of SNCP services with the same source board,

sink board and route as a group

Select a SNCP service as detection objective

Increase SNCP information processed

Restoration is separated from grouping

Grouping is not effective to external commands






Linear Multiplex Section Protection:

− 1+1 Linear MS Protection

− 1:N (N≤5) Linear MS Protection

Protection Rings

− 2-fibre Bidirectional Multiplex Section Shared Protection

Ring

− 2-fibre Unidirectional Multiplex Section Dedicated

Protection Ring



1+1 Linear MS Protection

Structure of 1+1 Linear MS Protection System:

DoubleTM

DoubleTM

Working

Protection



Protection mechanism of 1+1 linear MS protection system:

Concurrent sending permanent bridging

Selective receiving switching

W

P

A B



Switching modes of 1+1 linear MS protection system:

Unidirectional switching or Bidirectional switching

Revertive mode or Non-Revertive mode

As a result:

Unidirectional switching in Revertive mode

Unidirectional switching in non-revertive mode

Bidirectional switching in Revertive mode

Bidirectional switching in non-revertive mode

APS protocol necessity

Unnecessary for unidirectional switching in non-Revertive mode

Necessary for other modes

Bidirectional and non-revertive is suggested


1:N Linear MS Protection

1:N Linear MS Protection

A B

Bridging Selector

Protection section (Transmit)

Working section 1(Transmit)

Protection section (Receive)

Working section 1(Receive)

Working section 2(Transmit)

Working section 2(Receive)

Working section N(Transmit)

Working section N(Receive)

Selector Bridging


1:N Linear MS Protection Switching modes of 1:N linear MS protection system:

Bidirectional switching, Revertive mode

APS protocol necessity

Necessary

Features

Based on TM

Switch within point to point

After configuration 2 minutes, MS protocol is started automatically

External commands

− Forced Switch

− Manual Switch

− Exercise Switch

− Locked out


Comparison

Protection switching triggers are SF and SD

SF (Signal Fail) includes RLOS, RLOF, MS-AIS,

etc.

SD (Signal Degrade) includes B2-SD

APS Necessity

All require APS protocol, but unidirectional 1+1

linear MS protection

ComparisonComparison


Comparison

Network Capacity

NSTM-N for 1:N linear MS protection without

extra traffic or (1+N) STM-N with extra traffic

STM-N for 1+1 linear MS protection regardless

of the switching modes

ComparisonComparison


Questions

Which one has the fastest switching speed?

Which one can carry extra traffic?


Traffic flow when network is normal:

Working channels: 1~N/2 VC4

Protection channels: N/2+1~N VC4

2f-bi MS SP-Ring2f-bi MS SP-Ring

S1 P2S2 P1

NE A

NE B

NE C

NE D

4 VC4’s2 Working – S12 Protection – P2

4 VC4’s2 Working – S22 Protection – P1


2f-bi MS SP-Ring

The STM-1(e) signals occupy VC4 - #1

Source @ NE A Tributary Unit

NE A East Line unit (VC4 - #1)

fibre Line

NE B West Line unit (VC4 - #1)

NE B East Line unit (VC4 - #1)

fibre Line

NE C West Line unit (VC4 - #1)

Sink @ NE C Tributary Unit

Assume Traffic Service between NEA and NEC under normal traffic flow

STM-4 two-fibrebidirectional MSP ring

NE A

NE B

NE C

NE D

Metro 1000

East

Primary ring

West

West

West

East

East

West

East

Traffic between NE A and NE C

#1 VC-4


2f-bi MS SP-Ring2f-bi MS SP-RingIf the fibre between A and B breaks, the new switched STM-1(e) services flow will be as following: The STM-1(e) signals will switch to VC4 - #3

Source @ NE A Tributary Unit

NE A West Line unit (VC4 - #3)

fibre Line

NE D East Line unit (VC4 - #3)

NE D West Line unit (VC4 - #3)

fibre Line

NE C East Line unit (VC4 - #3)


fibre Line



fibre Line


Sink @ NE C Tributary Unit

STM-4 two-fibrebidirectional MSP ring

NE A

NE B

NE C

NE D

Metro 1000

East

Primary ring

West

West

West

East

East

West

East

Traffic between NE A and NE C

#3 VC-4

#3 VC-4

#1 VC-4


2f-bi MS SP-Ring

Protection switching triggers:

Automatic protection switching

− SF (Signal Failure): R-LOS, R-LOF, MS-AIS

− SD (Signal Degrade): B2-EXC, B2-SD

External initiated protection switching

− Forced switch

− Manual switch

− Exercise switch

− Locked out


2f-bi MS SP-Ring

Protection switching restoration:

Automatic protection switching

− Clear of SF (Signal Failure): R-LOS, R-LOF, MS-AIS

− Clear of SD (Signal Degrade): B2-EXC, B2-SD

− WTR (Wait to Restore): 10 minutes (5-12 minutes

provisionable)

External commands

− Clear of Forced switch

− Clear of Manual switch


2f-bi MS SP-Ring

APS controller:

Processes APS protocol and algorithm

− APS protocol is carried in the K1, K2 bytes.


Transition of APS controller status:

2f-bi MS SP-Ring2f-bi MS SP-Ring

I

I

I

I

S

S

P

P

WTR

WTR

P

PI = Idle P = Pass-throughS = Switching WTR = Wait to Restore

Recover fibres

Cut off fibres10 minutes later


2f-bi MS SP-Ring

Features of two-fibre bidirectional MS Shared Protection Ring:

Advantages:

− Time slots can be reused

− High network capacity ½*M*STM-N

Disadvantages:

− Mechanism complicated

Application:

− Mainly for STM-4 and above

− Scattered traffic distribution


SNCP

The most common topology in Access Layer

Network is flexibly to build and extend

Services are easily to configure and manage


SNCP

2 STM-1 level non-protection inter-connection rings is built by Metro 1000

Non-protection

Working channel

Standby channel


SNCP2 STM-1 level non-protection inter-connection rings is built by Metro 1000

Non-protection

Working channel

Standby channel


Conversion of SNCP and Normal Services

Configuring service can be converted between SNCP type

protection and non-protection freely

Standby route can be set by customers according to the

network topology

Changing the service type will not interrupt service

transmission


Conversion of SNCP and Normal Services

Non-protection

Working channel

Standby channel


Questions

Which differences can you find between a unidirectional ring

and a bidirectional one?

What’s the difference between a SNCP and an MSP?

Which one can carry extra traffic?


Summary

Item 2f-MS SPRing SNCP

APS protocol necessary unnecessary

Typical services Bidirectional and

disperse

unidirectional and

centralized

Switch level

(objective)

MS SNC services

Suitable networking Only ring All topology

Switching

implementing boards

LU, XC LU, XC

Switch time About 25ms The more traffic, the longer

switching time

Network Capacity K*STM-N/2 STM-N

Extra traffic Support Not support

Network Capacity K*STM-N/2 STM-N

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OTA101103 OptiX Metro series Equipment Networking and Applic.ppt