Cadence Flash F200-2 Guia de Resolução de Problemas descarregar pdf (Página 57)

DSP and voice quality troubleshooting 57

Collecting statistics for echo problems To collect statistics for echo

problems, capture the output of the following commands to a log file (for

example, through logged Telnet or HyperTerminal session):

1. Determine the gateway channel being used to make the call that

experiences echo:

— Obtain the IP address and TN of the IP Phone that experiences

echo problems (from the IP Phone, use the SERVICES key to

retrieve the phone information).

— Use the TRAK/TRAC commands in LD 80 to determine the

physical TN (gateway channel). Alternatively, enter the vgwShow

command (see “vgwShow ” (page 303)) on any VGMC in the node

and it returns the card and channel the telephone uses.

After you determine the gateway channel, log on to the associated

VGMC and run the itgCardShow or vgwShow command. The number

printed in the Chan column is the channel number.

While the call is in progress, turn the Echo Canceller and DSP

statistics on. You must enable the DimDspStat and DimECStat

variables to print the output data for the commands in step 3. Exercise

caution, because these variables print a block of data at the end of

every call for every channel on the VGMC.

— DimDspStat =

—

DimECStat =

—

dimPrintChannelInfo

Run the next set of commands several times during a call experiencing

echo. For example, run these commands a few times if the call

experiences silence. Then run the commands a few times while

the parties talk. Make sure when you log this information, that you

document which output corresponds with which scenario. Enter

text such as banner <scenario with which the following output

is associated>. Because no banner command exists, the data is

ignored.

— tsm_stat_req_ecd/jointfilesconvert/306392/bg

— tsm_stat_req_error

— tsm_stat_req_rx_tx

— tsm_stat_req_tele_levels

— tsm_stat_req_vp_delay

— dimPrintECC

4. Determine the effects of turning the Echo Canceller and Non Linear

Processor On and Off. Use the tsm_echo_canceller command with

the appropriate parameters for the following cases:

Nortel Communication Server 1000

Troubleshooting Guide for Distributors

NN43001-730 02.02 31 December 2009

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