[asterisk-users] noisy analog lines

[Mojo with Horan & Company, LLC]

To help you adjust your rxgain and txgain appropriately, you can ask 
your telco for the phone number for a "milliwatt test line".  10 is a 
pretty high number for the gain, although it DOES depend on your 
distance from the telco and the line quality.  My rxgain ranges between 
2.375 and 2.945 depending on the specific channel.  I'm a half mile from 
the center.

Ian wrote:
> Hi all
>
> I have a small problem here.
>
> We are running Asterisk 1.4.18 and libpri 1.4.3 (how can I check the 
> zaptel version again?) on an Intel core 2 duo 1.6Ghz, 2GB ram under 
> Ubuntu server.
>
> We have 4 analog line coming into the box via a TDM 800 wildcard with 
> echo cancel module and quad fxo modules.
>
> The server has been running smoothly with almost no problems for awhile now.
>
> Recently I started picking up problem with the voice clarity on our end, 
> it sounds like a mobile going through a low signal patch. I asked the 
> person on the other end and they can hear me loud and clear.
>
> I bumped the txgain up a notch a while back, can it be because of this?
>
> I ran a top and saw that the server only have about 16Mb free ram, can 
> this be a possible cause?
>
> My zapata.conf and zaptel.conf are below.
>
> Thanks in advance
> Ian
>   
>> # less /etc/zaptel.conf
>> # Autogenerated by /usr/sbin/zapconf on Fri Feb 29 16:12:07 2008 -- do 
>> not hand edit
>> # Zaptel Configuration File
>> #
>> # This file is parsed by the Zaptel Configurator, ztcfg
>> #
>> # Span 1: WCTDM/0 "Wildcard TDM800P Board 1" (MASTER)
>> fxsks=1
>> fxsks=2
>> fxsks=3
>> fxsks=4
>> # channel 5, WCTDM/0/4, no module.
>> # channel 6, WCTDM/0/5, no module.
>> # channel 7, WCTDM/0/6, no module.
>> # channel 8, WCTDM/0/7, no module.
>>
>> # Global data
>>
>> loadzone        = za
>> defaultzone     = za
>> # less /etc/asterisk/zapata.conf
>> [trunkgroups]
>> ; define any trunk groups
>>
>> [channels]
>> ;hardware channels
>>
>> ;default
>> ;groep nommers en rede
>> ; 1 => Landlyn
>> ; 2 => Selfoon
>>
>> ; Span 1: WCTDM/0 "Wildcard TDM800P Board 1" (MASTER)
>> ;;; line="1 WCTDM/0/0"
>> signalling=fxs_ks
>> callerid=asreceived
>> context=incoming_calls
>> group=2
>> busydetect=yes
>> usecallerid=yes
>> hidecallerid=no
>> callwaiting=no
>> threewaycalling=yes
>> transfer=yes
>> echocancel=yes
>> pulsedial=no
>> callprogress=yes
>> busycount=5
>> subscribecontext=GXP_BLF
>> overlapdial=no
>> toneduration=200
>> txgain=10.0
>> rxgain=10.0
>> channel => 1
>>
>> ;;; line="2 WCTDM/0/1 FXSLS"
>> signalling=fxs_ks
>> callerid=asreceived
>> context=incoming_calls
>> group=1,2
>> busydetect=yes
>> usecallerid=yes
>> hidecallerid=no
>> callwaiting=no
>> threewaycalling=yes
>> transfer=yes
>> echocancel=yes
>> pulsedial=no
>> callprogress=yes
>> busycount=5
>> subscribecontext=GXP_BLF
>> txgain=10.0
>> rxgain=10.0
>> overlapdial=yes
>> channel => 2
>>
>> ;;; line="3 WCTDM/0/2"
>> signalling=fxs_ks
>> callerid=asreceived
>> context=incoming_calls
>> group=1
>> busydetect=yes
>> usecallerid=yes
>> hidecallerid=no
>> callwaiting=no
>> threewaycalling=yes
>> transfer=yes
>> echocancel=yes
>> pulsedial=no
>> callprogress=yes
>> busycount=5
>> subscribecontext=GXP_BLF
>> txgain=10.0
>> rxgain=10.0
>> overlapdial=yes
>> channel => 3
>>
>> ;;; line="4 WCTDM/0/3"
>> signalling=fxs_ks
>> callerid=asreceived
>> context=incoming_calls
>> group=1
>> busydetect=yes
>> usecallerid=yes
>> hidecallerid=no
>> callwaiting=no
>> threewaycalling=yes
>> transfer=yes
>> echocancel=yes
>> pulsedial=no
>> callprogress=yes
>> busycount=5
>> subscribecontext=GXP_BLF
>> txgain=20.0
>> rxgain=10.0
>> overlapdial=yes
>> channel => 4
>>     
>
>
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-- 

*Mojo Wentworth*
HORAN & COMPANY, LLC
403 Lincoln Street, Suite 210
Sitka, AK 99835
(907) 747-6666
(907) 747-7417 - Fax
mojo at horanappraisals.com