3 Overhead

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Transcript of 3 Overhead

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Overhead Bytes

ZTE University

Transmission Course Team

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SDH Overhead Overview

Section Overhead

Path Overhead

SummaryThe focus is alarm, performance monitoring principle

Contents

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SDH Overhead Overview

Overhead

SOH

POH

RSOH

MSOH

High Order POH

Low Order POH

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Section Overhead

A1 A1 A1 A2 A2 A2 J0

B1 E1 F1

D1 D2 D3

A U - P T R

B2 B2 B2 K1 K2

D4

D5 D6

D7 D8 D9

D10 D11 D12

S1 M1 E2

RSOH

MSOH

9

rows

Bytes reserved for domestic use

Media dependent bytes (temporary usage)

9 bytes

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A1 and A2 Bytes

Framing bytes A1, A2

•Isolate single frame from consecutive signal stream

•A1=f6H A2=28HÁ ¬Ð øРź ÅÁ ÷

STM-N STM-N STM-N STM-N STM-N STM-N

Á ¬Ð øРź ÅÁ ÷

STM-N STM-N STM-N STM-N STM-N STM-N

Consecutive signal stream

Can’t find for 5 frame

continuouslyFind A1, A2 Report OOF

Continue for 3ms

LOFInsert all “1” code

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Framing

Find A1,A2

OOF

LOF

AISNext

Process

Y

N

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J0 Byte

Regenerator section trace byte : J0

Identification of RS access point.

Make sure the regenerator section of sending and receiving points keep continuously connecting

16 J0 bytes distributed in 16 continuous STM-N frame for transmitting the access point identification

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F1 Byte

User channel byte : F1

Provide a 64kbit/s data/voice channel for special maintenance purpose for network operator.

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D1~D12 Bytes

Data Communication Channel Bytes: D1~D12

•Channel for OAM message between NE and NE, NE and network management system terminal

•D1-D3 belongs to RSOH, bandwidth is 3×64kbit/s

•D4-D12 belongs to MSOH, bandwidth is 9×64kbit/s

OAM Massage: performance, alarm, operation command, etc.

DCC Channel

N M S

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E1 and E2 Bytes

Order wire byte:E1 and E2•Provide one 64kbit/s digital telephone channel respectively

•E1 transmit RS order wire message

•E2 transmit MS order wire message

NE NE NE NE

E1 and E2

E1: RS

E2: MS

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Bit Interleaved Parity 8 (BIP-8) byte: B1

Regenerator section error code monitoring

Detect unit is bit block

B1 BBE represented by RS-BBE

Bit Interleaved Parity N×24 code (BIP-N×24) byte: B2

Multiplexing section error code monitoring

Detect unit is bit block

B2 BBE represented by MS-BBE

B1 and B2 Bytes

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X1 00110011X2 11001100X3 10101010X4 00001111

B 01011010

BIP-8

11001100 11001100 11001100

01011101 01011101 01011101

11110000 10110000 11110000BIP-24

01100001 01100001 01100001

0000000 0100000 0000000

•Verify each bit column

•Make the total number of 1 in one column to be even

B1: In unit of 1 byte (8 bits)

B2: In unit of 3 byte (24 bits)

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1st

Frame

A B

1st Frame

Tx

2nd Frame

No.n Frame

2nd Frame

Rx

No.n Frame

Calculate B1, B2

Verify B1, B2

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M1 Byte

Find B2 Error: MS-BBE

Rx Tx

Traffic

Return M1

Generate MS-REI

Multiplex Section Remote Error Indication ( MS-REI ) byte: M1A return message from Rx to Tx when Rx find MS-BBE

Content is sum of error code block verified by Rx used B2

Tx generate corresponding performance event MS-REI

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K1 and K2 Bytes

Automatic Protection Switching (APS) channel byte: K1, K2 ( b1-b5 )Transmitting APS signaling

•Implement equipment self-healing function•Used for network multiplex protection switch function

Multiplex Section Remote Defect Indication (MS-RDI): K2 (b6-b8)

•Return alarm message from Rx to Tx•Indicate Rx receiving alarm•K2(b6-b8) value is 110

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Detect K2 (b6~b8)

111

Generate MS-AIS

Return MS-RDI

Y

N

Other Operation

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S1 Byte

Synchronization status byte: S1 ( b5-b8 )Value indicate quality level of tracing clock source

Implement clock source protection function

RSOH, MSOH implement layered monitoring function

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Path Overhead

Classification

•Low order POH: POH of VC12

•High order POH: POH of VC4

Difference

•Macro and micro

•Including and include

POH

High Order POH

Low Order POH

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High Order Path Overhead

J1B3

C2

G1

F2

H4

F3

K3

N1

VC4

1

1

261

9

The structure of High Order Path Overhead

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J1 Byte

Path trace byte: J1•The first byte of VC4•Pointed by AU-PTR•Required match•Set value as need

Detect J1

Match

Next Process

Y

N

HP-TIM

Insert AIS downward

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B3 Byte

Path BIP-8 CodeImplement VC4 transmission performance monitoringMonitoring principle: BIP-8 even parityLayered monitoring: B1, B2, B3

Verifier B3

Correct

Y

N

Next process

HP-BBE

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C2 Byte

Signal label byte: C2Indicate the composition of multiplexing structureExample:

00H means unequipped02H means multiplexing structure is TUGIndicate the information payload of the VC frame

Required match

Detect C2

00H

HP-UNEQ

Y

N

Next process

Match

Y

N

HP-SLM

Insert AIS downward

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G1 Byte

Path status byte: G1Indicating high order VC transmission statusReturn message from Rx to Tx

HP-REI: Higher Order Path Remote Error indication (sum of receiving error block of VC4)HP-RDI: High Order Path Remote Defect Indication

Detect receiving VC4

HP-UNEQHP-SLM

Y

N

HP-RDI

HP-REI

HP-BBE

Y

N

Next Process

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H4 Byte

TU location indicator byte: H4Indicate the multi-frame types and location of the payload.For 2M PDH to SDH multiplexing structure, H4 indicates the current frame is which frame of the multi-frame, allowing Rx to find TU-PTR and drop 2M signals.H4: 00H-03H

Start

00H~03H

Y

N

Next Process

HP-LOM

Insert AIS downward

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Other Bytes

F2 and F3: user channel bytes

K3: APS for high order path.

N1: byte for network operator usage

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Low Order Path Overhead

Here mainly discuss POH in VC12 Location

First byte of each basic frame in a multi-frameConsist of four bytes

Monitoring VC12 performance during signal transmission

11

9

500us VC12 Multi-frame

V5 J2 N2

VC12 VC12VC12

4K4

VC12

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V5 Byte

Path status and signal label byte: V5The first byte of VC12 multi-framePointed by TU-PTRMonitor error block, signal label, path status

Error block monitoring: b1-b2Return path status message:b3, b8Signal label: b5-b7

Similar with B3, C2 and G1

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V5 Byte

Detect V5

Verify b1&b2,Correct or not

Y

N

Next Process

LP-BBE

LP-UNEQ

b5~b7=000N

LP-SLM

Y

Return LP-REI

b3 Return LP-RDI

b8

Match

Y

N

Next Process

Insert AIS

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Other Bytes

J2: Low order path trace byte

N2: byte for network operator usage

K4: APS for low order path

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Implement SDH signal monitoring----overhead

SOH——RSOH 、 MSOHPOH——HPOH 、 LPOH

Summary

STM-NRSOH

STM-1MSOH

VC4HO POH

VC12LO POH

Layered monitoring function