07_OTA105210 OptiX NG-SDH Alarm and Performance Event ISSUE 1.02

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OTA105210 OptiX NG-SDH Alarm and Performance EventISSUE 1.02www.huawei.com

HUAWEI TECHNOLOGIES CO., LTD.

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Upon completion of this course, you will be able to: Know the mechanism of SDH Alarm and performance generation; Analyze and process most of common alarm and performance events.

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Page 1

Chapter 1 Generation of Alarm& Performance Chapter 2 Alarm& Performance Event Clearing

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Page 2

Chapter 1 Generation of Alarm& Performance1.1 Terminology 1.2 Higher Order Part 1.3 Lower Order Part 1.4 Suppression Correlation between SDH Alarms 1.5 Generation and Detection of SDH Performance Events

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TerminologyDownlink signal flow & Higher order part

Higher order part

SDH Interface

cross-connect

SDH Interface

unitPDH interface

Downlink signal flowHUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 4

Terminology

Uplink signal flow & Lower order part

SDH Interface

cross-connect

SDH Interface

unitPDH interface

Uplink signal flow

Lower order part

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Page 5

TerminologyTwo Common Alarms AIS (Alarm Indication Signal)

Inserts the all 1s signal into the lower level circuits, Indicating that the signal is unavailable. Common AIS alarms include MS_AIS, AU_AIS, TU_AIS and E1_AIS. RDI (Remote Defect Indication)

Indicates the alarm transferred back to the home station from the opposite station after the opposite station has detected alarms of LOS (loss of signal), AIS and TIM (trace identifier mismatch). Common RDI alarms include MS_RDI, HP_RDI and LP_RDI.HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 6

Chapter 1 Generation of Alarm& Performance1.1 Terminology 1.2 Higher Order Part 1.3 Lower Order Part 1.4 Suppression Correlation between SDH Alarms 1.5 Generation and Detection of SDH Performance Events

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Page 7

Alarms& Performance of Higher Order PartSDH Interface to Cross-connect Unit

Uplink signal FlowA STM-N SPI B RST C MST D MSP E MSA F HPT G Cross-connect Unit

Downlink signal Flow

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Page 8

Alarms& Performance of Higher Order PartDiagram of Alarm GenerationFrame synchronizer& RS overhead processor (RST)STM-N Optical Signal LOS LOF B1 Err 1

MS overhead processor (MST)AIS MS_AIS K2 B2 Err B2 MS_REI M1 MS_RDI K2 1

Pointer processor& HP overhead processor (MSA, HPT)AIS AU_AIS X C S

A1,A2 B1

H1,H2

H1,H2 AU_LOP HP_TIM J1 HP_UNEQ C2 C2 HP_SLM

1

H4 HP_LOM B3 B3 Err HP_REI G1 G1 HP_RDI

Downlink signal flow Signal transfer point (Insert down all "1"s signal) HUAWEI TECHNOLOGIES CO., LTD. All rights reserved

Alarm report or return Alarm termination point (Report to SCC unit) Page 9

Alarms& Performance of Higher Order PartDownlink Signal Flow Frame synchronizer and RS overhead processor

Optical receiving

Optical/electrical conversion (O/E) O/E module checks Optical signal (If no light in the input signal, optical power excessively low or high or the code type mismatch, R_LOS alarm will be reported) A1, A2 and J0 bytes detecting Search the framing bytes (R_OOF, R_LOF) Extract the line synchronous timing source J0 byte (J0_MM) Scramble B1 byte detecting BIP-8 computing to check bit error (B1_SD, B1_EXC, SES, RSUAT) Process F1, D1 - D3 and E1 bytesHUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 10

Alarms& Performance of Higher Order PartDownlink Signal Flow MS overhead processor K1 and K2 bytes detecting

SF and SD detection Process D4 ~ D12, S1 and E2 bytes MSP protection function MS_AIS, MS_RDI B2 byte detecting

BIP-24 computing to check bit error (B2_SD and B2_OVER) M1 bytes (MS_REI)

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Alarms& Performance of Higher Order PartDownlink Signal Flow Pointer processor and HP overhead processor H1 and H2 bytes detecting

Frequency and phase alignment Locate each VC-4 and send it to higher order path overhead processor Generate AU_AIS, AU_LOP J1, C2, B3 and G1 bytes detecting J1 Bytes (HP_TIM) C2 Bytes (HP_UNEQ, HP_SLM) B3 bit error detecting (B3_SD, B3_OVER, SES, HVCUAT) H4 Bytes (For VC12 signal, HP_LOM) G1 Bytes (HP_RDI, HP_REI) F3, K3, N1 Bytes (Reserved)

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Alarms& Performance of Higher Order PartUplink Signal Flow Pointer processor and HP overhead processor Generates N higher order path overhead bytes

J1, C2, B3, G1, F2, F3 and N1 Bytes Return alarm to the remote end

HP_RDI (G1) HP_REI (G1)

AU-4 pointers generating Pointer processor generates N AU-4 pointers

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Alarms& Performance of Higher Order PartUplink Signal Flow MS overhead processor Set multiplex section overhead (MSOH) Bytes

K1, K2, D4-D12, S1, M1, E2 and B2 Bytes Return alarm to the remote end

MS_RDI (K2) MS_REI (M1)

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Alarms& Performance of Higher Order PartUplink Signal Flow Frame synchronizer and RS overhead processor Set regenerator section overhead (RSOH) Bytes

A1, A2, J0, E1, F1, D1-D3 and B1 Bytes Frame synchronizer and scrambler scrambles STM-N electrical signals E/O

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Chapter 1 Generation of Alarm& Performance1.1 Terminology 1.2 Higher Order Part 1.3 Lower Order Part 1.4 Suppression Correlation between SDH Alarms 1.5 Generation and Detection of SDH Performance Events

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Page 16

Alarms & Performance of Lower Order PartPDH Interface to Cross-connect Unit

Uplink signal Flow

G Cross-connect Unit HPA

H LPT

I LPA

J PPI

K PDH Interface

Downlink signal Flow

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Page 17

Alarms & Performance of Lower Order PartDiagram of Alarm GenerationHigher Order Path Adaptation& Lower Order Path Termination (HPA, LPT) LP_SLM LP_UNEQ LP_TIM TU_LOP TU_AIS HP_LOM All 1 LP_RFIFO Alarm report or return Alarm termination point (Report to SCC unit) E1 Interface LP_TFIFO Lower Order Path Adaptation PDH Physical Interface E1 Interface T_ALOS

X C S

(LPA) E1_AIS All 1

(PPI)

V5 V5 J2 V1,V2 V1,V2 H4 V5

X C S

LP_RDI E1_AIS BIP 2 V5 LP_REI

Downlink signal flow Signal transfer point (Insert down all "1"s signal)

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Page 18

Alarms & Performance of Lower Order PartDownlink Signal FlowV1, V2 and V3 bytes detecting

Demap the VC-4 into VC-12s Pointers of all VC-12s are decoded TU_AIS, TU_LOPV5 Bytes detecting

LP_RDI( b8), LP_UNEQ, LP_SLM( b5-b7), LP_REI( b3) BIP-2 computing to check bit error( b1-b2)H4 Bytes detecting

HP_LOMJ2 Bytes detecting

LP_TIMHUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 19

Alarms & Performance of Lower Order PartDownlink Signal Flow Lower Order Path Adaptation& PDH Physical Interface Lower Order Path Adaptation

Recover data stream and the related clock reference signals Detect LP_RFIFO alarm PDH Physical Interface

Forming a 2048 kbit/s signal

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Alarms & Performance of Lower Order PartUplink Signal Flow Lower Order Path Adaptation& PDH Physical Interface Lower Order Path Adaptation

Data adaptation Detect LP_TFIFO alarm PDH Physical Interface

Clock extraction and dada regeneration Detect and terminate the T_ALOS alarm Detect E1_AIS alarm

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Page 21

Alarms & Performance of Lower Order PartUplink Signal Flow Higher Order Path Adaptation& Lower Order Path Termination Lower Order Path Termination

Insert POH in the C-12 (C-12 to VC-12) V5 byte (Insert "signal label" in the b5-b7, calculate BIP-2, set the result to the b1 and b2)

Higher Order Path Adaptation Adapt VC-12 into TU-12 Map TU-12 into higher order VC-4

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Page 22

Difference between E3/E4 and E1 Alarm Signal For E3 and E4 PDH services, the flow of signal processing is the same

as that of E1 PDH service But there are still some differences: Same Type of Alarms with Different Names 2Mbit/s 34Mbit/s 140Mbit/s T_ALOS P_LOS EXT_LOS TU_AIS E3_AIS C4_R_LAISD/C4_T_LAISD

Path Overhead Bytes Used for Alarm& Performance Monitoring are Different2Mbit/s: V5 Byte 34Mbit/s, 140Mbit/s: B3, J1, C2 and G1 Bytes

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Page 23

Chapter 1 Generation of Alarm& Performance1.1 Terminology 1.2 Higher Order Part 1.3 Lower Order Part 1.4 Suppression Correlation between SDH Alarms 1.5 Generation and Detection of SDH Performance Events

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Page 24

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