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New Member

ADSL troubleshooting

Hi,

I have an adsl connection using the cisco 1841 router and I would like  to check why my connection has some problems and cannot utilize the line  correctly. I have below the commands, sh dsl interface & sh  processes cpu, which show that the "Noise Margin" is not quite high. So,  is there any link from cisco that troubleshoots the adsl connections  from the physical layer til the last one? If not for the current model,  please let me know for another one.

router#sh dsl interface atM 0/0/0

ATM0/0/0

Alcatel 20190 chipset information

ATU-R (DS)               ATU-C (US)

Modem Status:      Showtime (DMTDSL_SHOWTIME)

DSL Mode:      ITU G.992.5 (ADSL2+) Annex A

ITU STD NUM:       0x03                     0x2

Chip Vendor ID:      'STMI'                     'BDCM'

Chip Vendor Specific:  0x0000                0xA340

Chip Vendor Country:   0x0F                0xB5

Modem Vendor ID: 'CSCO'                     'BDCM'

Modem Vendor Specific: 0x0000                0x0000

Modem Vendor Country:  0xB5                0xB5

Serial Number Near:     FOC1314404GCISCO73993206

Serial Number Far:  Chip ID:       C196 (0)

DFE BOM:      DFE3.0 Annex A (1)

Capacity Used:      98%                     100%

Noise Margin:       5.5 dB                 6.0 dB

Output Power:      19.0 dBm                12.5 dBm

Attenuation:      30.0 dB                18.0 dB

Defect Status:      None                                   None

Last Fail Code:      None

Watchdog Counter: 0x9C

Watchdog Resets: 0

Selftest Result: 0x00

Subfunction:      0x00

Interrupts:      16247 (0 spurious)

PHY Access Err:      0

Activations:      2

LED Status:      OFF

LED On Time:      0

LED Off Time:      0

Init FW:      init_AMR-3.0.014_no_bist.bin

Operation FW:      AMR-3.0.014.bin

FW Source:      embedded

FW Version:      3.0.14

DS Channel1       DS Channel0     US Channel1       US Channel0

Speed (kbps):                0             13368               0               758

Cells:                     0        470299944               0       1555653992

Reed-Solomon EC:            0             16489               0                  0

CRC Errors:                0              1117               0                  0

Header Errors:                0               919               0                  0

Total BER:            0E-0           5129E-10

Leakage Average BER:       0E-0           2438E-12

Interleave Delay:           0                38               0                51

router#sh processes cpu

CPU utilization for five seconds: 31%/14%; one minute: 34%; five minutes: 32%

PID Runtime(ms)   Invoked       uSecs   5Sec   1Min   5Min TTY Process

1          2608       3971          656  0.00%  0.00%  0.00%   0 Chunk Manager

2        88284     883796           99  0.00%  0.02%  0.01%   0 Load Meter

3             0           3            0  0.00%  0.00%  0.00%   0 VTEMPLATE Backgr

4      5115400     489547       10449  0.00%  0.08%  0.10%   0 Check heaps

5          1152       1260          914  0.00%  0.00%  0.00%   0 Pool Manager

6             0           2            0  0.00%  0.00%  0.00%   0 Timers

router#sh interfaces atM 0/0/0

ATM0/0/0 is up, line protocol is up

Hardware is HWIC-DSLSAR (with Alcatel ADSL Module)

MTU 4470 bytes, sub MTU 4470, BW 758 Kbit/sec, DLY 670 usec,

reliability 255/255, txload 169/255, rxload 171/255

Encapsulation ATM, loopback not set

Encapsulation(s): AAL5  AAL2, PVC mode

23 maximum active VCs, 256 VCs per VP, 1 current VCCs

VC Auto Creation Disabled.

VC idle disconnect time: 300 seconds

Last input never, output 00:00:00, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 2026272

Queueing strategy: Per VC Queueing

5 minute input rate 938000 bits/sec, 151 packets/sec

5 minute output rate 503000 bits/sec, 146 packets/sec

274572230 packets input, 3803801013 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 34414 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

241815034 packets output, 2950063973 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

0 output buffer failures, 0 output buffers swapped out

Everyone's tags (3)
1 ACCEPTED SOLUTION

Accepted Solutions
New Member

ADSL troubleshooting

Hi,

Yes, it will work regardless of the platform, the firmware will adjust/modify the card's operation only. These are the steps for the firmware upgrade, it is the same procedure as when doing an IOS upgrade:

1. Download the file and rename the file "adsl_alc_20190.bin".

2. We need to have a TFTP server software installed on a PC.

3. PC connected to the Cisco router through a network cable.

4. Make sure we have connectivity to and from the Cisco router (we are able

to ping).

5. The file (Firmware file) must be saved in the TFTP server software root

directory.

6. After upgrading the firmware we need to reload the router in order for

the new firmware to take effect.

Regards.

11 REPLIES

ADSL troubleshooting

Hi,

Please see the output of your third command.

reliability 255/255, txload 169/255, rxload 171/255


TX and RX is high, which can result in slow responses.

Also, if you can post output of command

sh caller

sh run int at 0/0/0

Regards,

Smitesh

New Member

ADSL troubleshooting

Hello Smitesh,

sh run int at 0/0/0

interface ATM0/0/0

no ip address

no atm ilmi-keepalive

dsl operating-mode auto

dsl enable-training-log showtime

dsl lom 200

pvc 8/35

  encapsulation aal5mux ppp dialer

  dialer pool-member 1

sh caller

                                                  Active    Idle

  Line           User               Service       Time      Time

  Vi2            \

                                    PPPoATM       2w2d      00:00:00 

 

by the way, there are two lines on the router.

ADSL troubleshooting

Hi,

As seen in output of command sh caller, your that link is stable for over 2 weeks.

Hence, it is definately issue with the over utilization of the link.

Also, as you mentioned that you have got another link too. There are many concerns on  the same.

1. Is that link been used ?

2. How load balancing is configured.

3. How routing with ISP is configured

It would be much better if you can share sanitised config.

All of above can lead to performance issue which can be due to not proper load balancing OR asymmetric routing, etc.

Regards,

Smitesh

New Member

ADSL troubleshooting

Hi,

I assume you have an HWIC-1ADSL, you can try to upgrade your ADSL card firmware to 4.0.15 (you can do this by dowloading secific firmware or by upgrading IOS to latest ones), currently you are using embedded one 3.0.14, this will improve EC and solve some interop problems. Just as an aside question, are you experiencing some sort of problems? I can see card is reporting Reed Solomon EC which is good and a few CRC errors .

Regards!

New Member

ADSL troubleshooting

this is the output of the HWIC-1ADSL, are you talking about the EEPROM format version ?

WIC/HWIC Slot 0:

ADSL over POTS

Hardware Revision        : 8.0

Top Assy. Part Number    : 800-26247-01

Part Number              : 73-9932-06

Board Revision           : A0

Deviation Number         : 0

Fab Version              : 08

PCB Serial Number        : FOC1314404G

RMA Test History         : 00

RMA Number               : 0-0-0-0

RMA History              : 00

Product (FRU) Number     : HWIC-1ADSL       

Version Identifier       : V01

CLEI Code                : COUIADECAA

EEPROM format version 4

Re: ADSL troubleshooting

hi,

your noise margin is below average. contact your SP to rectify this.

you also have high CRC errors. try changing RJ11, do a clear counters and monitor.

see useful link below:

http://insideeyelids.wordpress.com/2010/07/21/cisco-show-dsl-info-explained/

New Member

ADSL troubleshooting

Hi egeorgopoulos,

No, the firmware I am referring to is the one listed under the show dsl interface atm x command:

Init FW:      init_AMR-3.0.014_no_bist.bin

Operation FW:      AMR-3.0.014.bin

FW Source:      embedded

FW Version:      3.0.14

I would recommend upgrading it to 4.0.15, here is where you can download it:

http://www.cisco.com/cisco/software/release.html?mdfid=279624018&catid=268437899&softwareid=282821763&release=4.0.17&relind=AVAILABLE&rellifecycle=&reltype=latest

Regards.

New Member

ADSL troubleshooting

Is this software compatible with the 1841 router? If yes, are there any instructions for the HWIC upgrade?

Thank you.

New Member

ADSL troubleshooting

Hi,

Yes, it will work regardless of the platform, the firmware will adjust/modify the card's operation only. These are the steps for the firmware upgrade, it is the same procedure as when doing an IOS upgrade:

1. Download the file and rename the file "adsl_alc_20190.bin".

2. We need to have a TFTP server software installed on a PC.

3. PC connected to the Cisco router through a network cable.

4. Make sure we have connectivity to and from the Cisco router (we are able

to ping).

5. The file (Firmware file) must be saved in the TFTP server software root

directory.

6. After upgrading the firmware we need to reload the router in order for

the new firmware to take effect.

Regards.

New Member

ADSL troubleshooting

I know this to be a problem with the older WIC-1ADSL modules and the higher level IOSs; however I have not worked with the HWIC cards. Do a show dsl int atmx/x/x; this should show an output similar to this:

RNT-2650XM#show dsl int atm0/0
ATM0/0
Alcatel 20150 chipset information
                ATU-R (DS)                      ATU-C (US)
Modem Status:    Showtime (DMTDSL_SHOWTIME)
DSL Mode:        ITU G.992.1 (G.DMT) Annex A
ITU STD NUM:     0x01                            0x1
Vendor ID:       'ALCB'                          'BDCM'
Vendor Specific: 0x0000                          0x6291
Vendor Country:  0x00                            0xB5
Capacity Used:   99%                             55%
Noise Margin:     5.0 dB                         20.0 dB
Output Power:    14.0 dBm                        -1.5 dBm
Attenuation:      8.5 dB                          5.0 dB
Defect Status:   None                            None
Last Fail Code:  None
Selftest Result: 0x00
Subfunction:     0x15
Interrupts:      1334 (0 spurious)
PHY Access Err:  0
Activations:     1
LED Status:      ON
LED On Time:     100
LED Off Time:    100
Init FW:         embedded
Operation FW:    embedded
SW Version:      3.8131
FW Version:      0x1A04

                 Interleave             Fast    Interleave              Fast
Speed (kbps):             0             8128             0               512
Cells:                    0        126046078             0         629860292
Reed-Solomon EC:          0                0             0                 0
CRC Errors:               0                0             0                 0
Header Errors:            0                0             0                 0
Bit Errors:               0                0
BER Valid sec:            0                0
BER Invalid sec:          0                0

LOM Monitoring : Disabled

DMT Bits Per Bin
00: 0 0 0 0 0 0 0 0 0 3 4 6 8 8 8 8
10: 8 8 9 9 8 8 9 8 8 7 7 5 6 6 0 0
20: 0 0 0 0 0 0 8 8 9 9 9 A B B B B
30: B B B C C C C C C C C C C C C C
40: C C C C C C C C C C C C C C C C
50: B B B B B B B B B B B 2 B B B B
60: B B B B B B B B B B B B A B A A
70: A A B B B B A A A A A A A A A A
80: A A A A A A A A A B B B B B B B

Look at the interleave numbers; are they showing interleave or fast? If they are showing interleave rather than fast you will need to issue the following command on the atm interface which should look something like this:

RNT-2650XM#show run int atm0/0
Building configuration...

Current configuration : 209 bytes
!
interface ATM0/0
mtu 4400
no ip address
ip virtual-reassembly
ip tcp adjust-mss 1452
no ip mroute-cache
no atm ilmi-keepalive
dsl operating-mode auto
clock rate aal5 7000000
hold-queue 224 in
end

Again this is a problem with advipservices and adventerprise versions of the IOS with a WIC-1ADSL, if you do not issue the clock rate command the interface will operate at roughly half the speed of the line. After you issue the command it should operate at full speed.

Again I know this to be true with the WIC, not sure about the HWIC. I've got a very old post on here about this topic somewhere.

Cheers,

Sam

New Member

ADSL troubleshooting

Hi,

as you can see at the beginning of the discussion, the "sh dsl atm 0/0/0" shows:

DS Channel1       DS Channel0     US Channel1       US Channel0

Speed (kbps):                0             13368               0               758

Cells:                     0        470299944               0       1555653992

Reed-Solomon EC:            0             16489               0                  0

CRC Errors:                0              1117               0                  0

Header Errors:                0               919               0                  0

Total BER:            0E-0           5129E-10

Leakage Average BER:       0E-0           2438E-12

Interleave Delay:           0                38               0                51

Also, this router has the version "C1841-BROADBAND-M, Version 12.4(15)T7" and not advancedipservices

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