Cadence Flash F200-2 Guia de Resolução de Problemas descarregar pdf (Página 58)

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58 Troubleshooting

— ECAN: Off, NLP: On

—

ECAN: Off, NLP: Off

—

ECAN: On, NLP: Off

—

ECAN: On, NLP: On

5. When you finish testing, turn off printing of the ECAN and DSP

statistics. Otherwise, the syslog is quickly filled with DSP statistics

each time a gateway call occurs.

—

DimDspStat =

—

DimECStat =

Send collected statistics to Field Support for analysis.

Signal limiter Echo represents the major impairment in VoIP. Although

CS 1000 has a carrier-grade echo canceller (ECAN) that complies with the

G.168 recommendation from the ITU-T, cases still occur where the existing

PSTN network involves nonlinear hybrids. In these cases, the ECAN

experiences difficulties eliminating echoes generated when the voice signal

is at loud levels.

To solve the problem, Communication Server 1000 uses a signal limiter.

The signal limiter (SL) deals intelligently with the voice signal going from

CS 1000 system to the PSTN. While preserving the quiet voice signal

levels, the signal limiter (SL) adds some attenuation to loud signal levels.

Extra attenuation is added when the voice signals become louder.

For versatility, the signal limiter is granular. Several modes of operation

exist with only one parameter called SLim. The SLim parameter uses any

integer value from 1 to 5. A value of 1 is the most aggressive, while a

value of 5 is the least aggressive. A value of 0 means the functionality is

disabled, which is the default value when the CS 1000 is installed.

Configure the SLim for each card in the VxWorksShell as follows:

• setSLim value

for setting SLim for all channels of the card

• tsm_set_slim tcid,value

for specific TCID only when the channel is up

In general, the first command is used.

The more aggressive the SLim is, the more nonlinear distortion is in the

transmitted signal.

After you receive a complaint about echoing, perform the following steps:

Nortel Communication Server 1000

Troubleshooting Guide for Distributors

NN43001-730 02.02 31 December 2009

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