Dslam Ma5600 Fault

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Text of Dslam Ma5600 Fault

DSLAM MA5600/MA5603/MA5616 Troubleshooting ADSL Servicewww.huawei.com

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Objectives

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

Analyze and locating the ADSL service Fault. Eliminate the ADSL service fault.

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page2

Contents1. Fault Analysis and Locating 2. Fault Categorized Troubleshooting 3. Case Study

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page3

Contents1. Fault Analysis and Locating 2. Fault Categorized Troubleshooting 3. Case Study

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page4

ADSL Fault Analysis

Lets have a try to analyze the ADSL system fault by layered and

segmentation methodUser side Network sideDSLAM

PC

Modem/CPE

Internet

Line Port PPPoE LAN IP layer IP layer, DNS, FTP, HTTP

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page5

ADSL Fault Analysis (Cont.)

Whats the possible fault in each segment? Narrowband fault Attenuation Noise Line bridge Poor longitudinal balance User account Protocol PC fault Application software fault

Website

Internet

BAS

DSLAM

Subscriber line

Modem

PC

Port can not be activated Hardware fault Connection rate is low Data configuration

Fails and cannot be activated Powered off Unconnected Splitter fault

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page6

ADSL Fault Analysis

Whats the possible fault in each layer?

Application Presentation Session Transport Network Data Link Destination unreachable, PVC, VLAN, PPP link fail Cable defected, board failure, cable disconnected

Physical

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page7

ADSL Fault Check

The probability and location of the xDSL service faults

PC

Modem

MDF

MDF

DSLAM

BAS

60

30

10

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page8

ADSL Fault Check

Check CPE

Check PC and Modem

Check line

Check line quality through MODEM,DSLAM or test system Check line connection

Check DSLAM

Check board/port/interface status Check alarm/logs/debug information Check configuration /version

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page9

Check ModemLED

POWER ADSL LINK ACT LAN LINK ACTPVC

The Link LED should be on and ACT LED should always flicker

0 VPI/VCI 1 VPI/VCI 2Mode

The PVC VPI/VCI value should match the Configuration in MA5600

BridgeRouted PPP

The mode should match the configuration in MA5600 or BRAS

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page10

Check Modem

the physical line rate

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page11

Check Line Operation Parameter

MA5600(config-if-adsl-0/11)# display line operation 0 -------------------------------------------------------

Channel mode Downstream channel bit swap Upstream channel bit swap Trellis mode Standard in port training Downstream channel rate(Kbps)

: Interleaved: Enable : Enable : Enable : G.DMT : 6144

Downstream max. attainable rate(Kbps)Downstream channel SNR margin(dB)

: 7264: 18

Downstream interleaved channel delay(ms): 4

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page12

Check MA5600Class StateActive Normal / Standby-Normal Board Auto_find / Config / Normal / Failed / Prohibit Activating / Activated / Deactivated Port Online / Offline Interface Configuration Up / Down Ethernet ports Vlan-interface SCUB

Object

Service boards

xDSL ports

Line-profile / Traffic table / VLAN / Service-port / PVC

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page13

Check Board

Query board status

Whether some board is fault. If yes, please record the board type and the version.

MA5600#display board 0 ----------------------------------------------- 5 6 H601ADEE H601ADEE Failed Normal SlotID BoardName Status SubType0 SubType1

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page14

Check Logs and Alarms

Query system logs

Obtain the information on operations performed by different users

MA5600(config)# display log all

Query system generated alarms

Acquire the alarm information

MA5600(config)#display alarm history { alarmsn|all|alarmid|alarmlevel|alarmtype |alarmclass|alarmtime }:

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page15

Contents1. Fault Analysis and Locating 2. Fault Categorized Troubleshooting 3. Case Study

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page16

Categorized Common Fault

Internet Service Failure with Abnormal Voice Service.Internet Service Failure with Normal Voice Service. Very Slow Access. Unstable Access Rate or Frequent Interruption.

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page17

Categorized Fault Troubleshooting

Internet Service Failure with Abnormal Voice Service

Analysis:

You should ensure normal phone call and then analyze the internet service fault ,the possible faulty concerned with this phenomena should be: Bad line conditions Engineering mistake connection

Solution:

Report to line test center Test by line test system Check the line by segmentation manually

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page18

Categorized Fault Troubleshooting

Internet Service Failure with Normal Voice Service

Analysis:

The broadband access server The ADSL/ADSL2+ port The ADSL/ADSL2+ MODEM The user terminal The physical line Data configuration in MA5600

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page19

Categorized Fault Troubleshooting

Internet Service Failure with Normal Voice Service (cont.)

Solution:

Check status and indicators on MODEM LAN problem Is Modem is SYNC with DSLAM?

Check PPPoE phase Configure Modem into BRIDGE Mode Perform PPPoE dialling through Windows Dial Up Connection Check the Error after PPPoE dialling ends

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page20

Categorized Fault Troubleshooting

Internet Service Failure (cont.)

Solution: (Cont.)

If PPPoE dialling failed due to Error 678

Check Status of Line Board (ADEE/ADGE/ADLE):i. If LED RUN & it is periodically ON & OFF during Period of 1s then Board is normal. Then problem could be due to one of below issue: Service Port is not created on DSLAM Wrong VLAN or PVC:VPI/VCI configuration on DSLAM Wrong PVC:VPI/VCI Configuration on MODEM Wrong Configuration of H.S.I VLAN on Transmission OR on BRAS ii. If LED RUN is ON & OFF during period 0.5 s then replace Line Board

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page21

Internet Service Failure (cont.)If PPPoE dialling failed due to Error 691

The error is caused by the wrong ID or password of the subscriber. Initialize the information about the subscriber or set a new password to solve this problem.

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page22

Categorized Fault Troubleshooting

Unstable Access Rate or Frequent Interruption

Analysis:

This fault is generally caused by bad line conditions, relatively long line, orloop.

PC Audio Modem Modem Line

xDSL Modem Phone

Telephone line

SplitterFax IP dialer

Telephone set

Telephone extension

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page23

Unstable Access Rate or Frequent Interruption

Unstable Access rates or Frequent interruption of Internet is mostly due to the outer loop lines fault.

The issue of Access Rates or Frequent Interruption can be resolved by to

improving following most important Line Stats/Parameters:i. ii. SNR Margin Attenuation

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page24

Unstable Access Rate or Frequent InterruptionSNR MARGIN (dB)

SNR Margin could be thought of as a "buffer zone" which is there to protect your connection against normal SNR fluctuations that can and do occur on a daily basis.

If your SNR Margin is two Low, this may lead to slower throughput or frequent disconnections. 6dB or below is bad and will experience no synch or intermittent synch problems 7dB-10dB is fair but does not leave much room for variances in conditions 11dB-20dB is good with little or no synch problems* (but see note below) 20dB-28dB is excellent

29dB or above is outstanding

Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page25

Unstable Access Rate or Frequent InterruptionATTENUATION:

Line attention is in relation to the "loop loss" on line. it means loss of signal as distance increase.

The further you are away from the exchange the higher your attenuation figure will beas the si