Hardware Echo Cancellation Module

[Ojasvi Bansal]

Hey Guys,

My console's showing this error message. I have 4 PRIs on the gateway and all of them went dead when this happened. I had to reboot the router.

%HWECAN-5-TIMEOUT: HWECAN in slot 0 VWIC 3 Device 1 failed to return response for Command/Query 06

When I do sh echo-cancel hardware status 0, it shows following.

VWIC HWECAN 0/2 is UP.
Software version: 9.4.11 , Date: Jul 28 12:32:18 2009
Tail length: 128     Tone disabler type: G.165    Fax notify:  Off
Device: VWIC_8MBPS_2TIEC_TL128_MS_2P  Max Channels: 64
Both Port0 & Port1 have  Local HWECAN Connectivity.

ECAN CH   Assigned   DSP ID   VOICEPORT   EC   NLP   COV  LAW
===============================================================
  3          yes       0/5:4   0/2/0:23.3  on   on    on   u-Law
  4          yes       0/7:4   0/2/0:23.4  on   on    on   u-Law
  6          yes       0/5:6   0/2/0:23.6  on   on    on   u-Law
  7          yes       0/6:6   0/2/0:23.7  on   on    on   u-Law
  10         yes       0/1:3   0/2/0:23.10 on   on    on   u-Law
  13         yes       0/6:2   0/2/0:23.13 on   on    on   u-Law
  14         yes       0/9:4   0/2/0:23.14 on   on    on   u-Law
  16         yes       0/1:4   0/2/0:23.16 on   on    on   u-Law
  17         yes       0/10:3  0/2/0:23.17 on   on    on   u-Law
  18         yes       0/2:2   0/2/0:23.18 on   on    on   u-Law
  19         yes       0/10:5  0/2/0:23.19 on   on    on   u-Law
  20         yes       0/2:3   0/2/0:23.20 on   on    on   u-Law
  21         yes       0/6:5   0/2/0:23.21 on   on    on   u-Law
  22         yes       0/9:1   0/2/0:23.22 on   on    on   u-Law
  23         yes       0/10:6  0/2/0:23.23 on   on    on   u-Law
Total assigned channel(s): 15

VWIC HWECAN 0/3 is UP.
Software version: 9.4.11 , Date: Jul 28 12:32:18 2009
Tail length: 128     Tone disabler type: G.165    Fax notify:  Off
Device: VWIC_8MBPS_2TIEC_TL128_MS_2P  Max Channels: 64
Both Port0 & Port1 have  Local HWECAN Connectivity.

ECAN CH   Assigned   DSP ID   VOICEPORT   EC   NLP   COV  LAW
===============================================================
  1          yes       0/1:1   0/3/0:23.1  on   on    on   u-Law
  2          yes       0/1:6   0/3/0:23.2  on   on    on   u-Law
  3          yes       0/9:5   0/3/0:23.3  on   on    on   u-Law
  5          yes       0/10:1  0/3/0:23.5  on   on    on   u-Law
  6          yes       0/9:2   0/3/0:23.6  on   on    on   u-Law
  7          yes       0/2:6   0/3/0:23.7  on   on    on   u-Law
  8          yes       0/7:6   0/3/0:23.8  on   on    on   u-Law
  9          yes       0/11:3  0/3/0:23.9  on   on    on   u-Law
  10         yes       0/10:4  0/3/0:23.10 on   on    on   u-Law
  11         yes       0/9:3   0/3/0:23.11 on   on    on   u-Law
  12         yes       0/2:1   0/3/0:23.12 on   on    on   u-Law
  13         yes       0/10:2  0/3/0:23.13 on   on    on   u-Law
  14         yes       0/11:6  0/3/0:23.14 on   on    on   u-Law
  15         yes       0/1:2   0/3/0:23.15 on   on    on   u-Law
  16         yes       0/7:5   0/3/0:23.16 on   on    on   u-Law
  17         yes       0/2:4   0/3/0:23.17 on   on    on   u-Law
  18         yes       0/7:2   0/3/0:23.18 on   on    on   u-Law
  19         yes       0/2:5   0/3/0:23.19 on   on    on   u-Law
  20         yes       0/11:2  0/3/0:23.20 on   on    on   u-Law
  21         yes       0/11:1  0/3/0:23.21 on   on    on   u-Law
  22         yes       0/7:3   0/3/0:23.22 on   on    on   u-Law
  23         yes       0/9:6   0/3/0:23.23 on   on    on   u-Law
  33         yes       0/6:1   0/3/1:23.1  on   on    on   u-Law
  34         yes       0/6:4   0/3/1:23.2  on   on    on   u-Law
  35         yes       0/11:4  0/3/1:23.3  on   on    on   u-Law
  36         yes       0/11:5  0/3/1:23.4  on   on    on   u-Law
  37         yes       0/7:1   0/3/1:23.5  on   on    on   u-Law
  38         yes       0/6:3   0/3/1:23.6  on   on    on   u-Law
  39         yes       0/5:3   0/3/1:23.7  on   on    on   u-Law
  40         yes       0/5:1   0/3/1:23.8  on   on    on   u-Law
Total assigned channel(s): 30

Total device(s) in the slot 2

I did online reading and it suggested replacing the HWECAN module. Does anybody have any experience in this.

Regards
OJ

[Jonathan Schulenberg]

I've used an ECAN daughter card once. IOS 12.4(24)T and newer have baked the 128ms coverage into the standard DSP microcode. If it happens again I would upgrade IOS and yank the daughter card. There's no sense in paying for extra DSPs at this point it seems.

For my curiosity: What necessitated the longer echo cancellation coverage?

[Ojasvi Bansal]

I think I am missing some here. What you are saying is that IOS 12.4(24)T and higher don't need HW echo cancellation modules.

We were experiencing echo on our gateway. it was suggested to increase the echo cancellation coverage.

Thanks and Regards
OJ

[Felipe Garrido · Accepted solution]

Does the problem resolve itself when the router is reloaded? If so, it's possible that you could be hitting a known bug, CSCtg92548. Unfortunately, it is still being investigated. The only workaround is to remove the hardware ecan and upgrade to 12.4(24)T to get the 128ms ecan coverage.

-Felipe

[Ojasvi Bansal]

It only happened once and yes reloading the router fixed it.