How to determine faulty DSP on 2821 (C5510 DSP)

[csg]

Hi all,

On a partiular 2821 Cisco ISR which is equipped with multiple C5510s which are configured for transcoding, we have a recurring problem with distored voice or choppy voice when calls are transcoded from G711 to G729.

I can see from the IOS that there is a global test command (not hidden) that enables testing of the DSPs. However, it is not evident how this command should be used, for example:

#test dsp ?

  debugger  Test DSP global debugger

  device    Test DSP device

  memory    Test DSP memory

  recovery  Test the DSP auto-recovery

#test dsp device ?
  <0-2>  Slot id - the module id on the system.
  all    all slots to be acted upon
  print  print DSPs not in "show voice dsp"
  <cr>

#test dsp device 0 all ?

  dspware  Download flash file system DSPware.

  remove   Remove the specified DSP(s).

  reset    Reset the specified DSP(s).

  restore  Restore the specified DSP(s).

Has anyone used these commands before to test for a faulty DSP?

Thanks,

[Payal Bhaduri]

The command to determine a faulty DSP is

Router #test voice driver

Enter VPM or HDV or ATM AIM or NM-HD-xx or HDV2 slot number : 0

C2800 Debugging Section;

1 - FPGA Registers Read/Write

2 - 5510 DSP test

3 - DSPRM test

4 - HDLC32 test

5 - Quit

Select option : 2

5510 DSP Testing Section:

1 - Reset ALL DSPs

2 - Reset 1 DSP

3 - Download DSPware

4 - CHPIR Enable/Disable

5 - Display c5510 ring

6 - Show HPI RAM

7 - Show eHPI memory thru Relay command

8 - Show Controller

9 - c5510 Keepalive Enable/Disable

10 - Download bootloader using indirect slave access

11 - Write HPI RAM

13 - DSP application download

14 - faked dsp crash

15 - Wait in Firmware Restart Indication

16 - Display DSP Keepalive Status

17 - QUIT

Select option 16.

Also the command "show voice dsp group all" can show you the state of the DSP's