Post on 24-Dec-2015
description
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
Overhead Bytes
ZTE University
Transmission Course Team
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
SDH Overhead Overview
Section Overhead
Path Overhead
SummaryThe focus is alarm, performance monitoring principle
Contents
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
SDH Overhead Overview
Overhead
SOH
POH
RSOH
MSOH
High Order POH
Low Order POH
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
Framing
Find A1,A2
OOF
LOF
AISNext
Process
Y
N
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
F1 Byte
User channel byte : F1
Provide a 64kbit/s data/voice channel for special maintenance purpose for network operator.
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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)
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
1st
Frame
A B
1st Frame
Tx
2nd Frame
No.n Frame
2nd Frame
Rx
No.n Frame
Calculate B1, B2
Verify B1, B2
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
Detect K2 (b6~b8)
111
Generate MS-AIS
Return MS-RDI
Y
N
Other Operation
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
High Order Path Overhead
J1B3
C2
G1
F2
H4
F3
K3
N1
VC4
1
1
261
9
The structure of High Order Path Overhead
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
Other Bytes
F2 and F3: user channel bytes
K3: APS for high order path.
N1: byte for network operator usage
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
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
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
Other Bytes
J2: Low order path trace byte
N2: byte for network operator usage
K4: APS for low order path
The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited. ZTE University univ.zte.com.cn univ.zte.com.cn
Implement SDH signal monitoring----overhead
SOH——RSOH 、 MSOHPOH——HPOH 、 LPOH
Summary
STM-NRSOH
STM-1MSOH
VC4HO POH
VC12LO POH
Layered monitoring function