asterisk users - Nov 2004 - Echo - UK Impedance problem with X100P?

Hi, 

 

I have an X100p interface (clone).  The system works fine but I get echo to
a level where the system is all but unusable for IP - PSTN.  I seem to
remember reading somewhere that the UK line impedance is different from the
default compile and needs changing.   I have Wikied etc, but found nothing
yet.

 

Any pointers appreciated.

 

Regards

 

Chris Blunt

 

--

 

SIP: 232121@fwd.pulver.com

 

 

 

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> I have an X100p interface (clone).  The system works fine but I get
> echo to a level where the system is all but unusable for IP  PSTN.  I
> seem to remember reading somewhere that the UK line impedance is 
> different from the default compile and needs changing.   I have
> Wikied etc, but found nothing yet.
The x100p (and presumably the clones) have an integrated circuit on the
board that was manufactured for use in the US with 600 ohm pstn lines.
The chip cannot be changed to any other impedance. However, there can
be many different sources for the echo and impedance matching is only
one of them. Others include:
 - incorrect * zapata.conf parameters
 - poorly engineered motherboards (eg, poor PCI bus, interrupt latency)

For zapata.conf, try something like:
echocancel=yes
echotraining=800

For poorly designed motherboards, there is no consolidated list of
which ones are good/bad so you're left with trying another one on your
own to see if it impacts the echo.

The TDM04B digium card (as an example) does not use that same pstn
chip, but rather another one from the same chip manufacturer. That
chip does have support for something like 18 different "country"
telco standards.

Hi,
 
This sounds like the problem I have as well, the quality of the T100p is
awful i get so much echo and as Chris says, if there is a solution to this I
would love to know I have tried adjusting the RX, TX gain which sorta
helpdesk but the call quality is still quite poor. If there is something we
need to change before compiling then this needs to be documented.
 
Any help would be appreciated.
 
Thanks

-----Original Message-----
From: Chris Blunt [mailto:chris.blunt@entropy-it.com]
Sent: 12 November 2004 12:52
To: asterisk-users@lists.digium.com
Subject: [Asterisk-Users] Echo - UK Impedance problem with X100P?



Hi, 

 

I have an X100p interface (clone).  The system works fine but I get echo to
a level where the system is all but unusable for IP - PSTN.  I seem to
remember reading somewhere that the UK line impedance is different from the
default compile and needs changing.   I have Wikied etc, but found nothing
yet.

 

Any pointers appreciated.

 

Regards

 

Chris Blunt

 

--

 

SIP: 232121@fwd.pulver.com

 

 

 



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<snip>
I have an X100p interface (clone).  The system works fine but I get echo to a
level where the system is all but unusable for IP - PSTN.  I seem to remember
reading somewhere that the UK line impedance is different from the default
compile and needs changing.   I have Wikied etc, but found nothing yet.
 </snip>
 
This facility is only available with the TDM FXO cards not the X100's. I can
confirm the TDM01B eliminates all echo and impedence probs here in the UK.
 
Regards
Ian
 
 
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I am not willing to spend money on a system where even the most basic things
are incompatible with everybody but the US, this is just stupid I am using
the X100P in a small office so that we can have a small PBX, seems daft
having to upgrade my hardware just because of another US oversight. I am
using a Gigabyte Titan 4 Pro motherboard and also tried it on another PC
with an Intel motherboard and it had the same affect it could be Zapata.conf
but pin pointing this is getting stupid I might invest in a commercial PBX
as this is wasting so much of my time, its a good idea but saying the
product is in its infancy is an overstatement.

-----Original Message-----
From: Rich Adamson [mailto:radamson@routers.com]
Sent: 12 November 2004 13:27
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Echo - UK Impedance problem with X100P?

> I have an X100p interface (clone).  The system works fine but I get
> echo to a level where the system is all but unusable for IP  PSTN.  I
> seem to remember reading somewhere that the UK line impedance is 
> different from the default compile and needs changing.   I have
> Wikied etc, but found nothing yet.
The x100p (and presumably the clones) have an integrated circuit on the
board that was manufactured for use in the US with 600 ohm pstn lines.
The chip cannot be changed to any other impedance. However, there can
be many different sources for the echo and impedance matching is only
one of them. Others include:
 - incorrect * zapata.conf parameters
 - poorly engineered motherboards (eg, poor PCI bus, interrupt latency)

For zapata.conf, try something like:
echocancel=yes
echotraining=800

For poorly designed motherboards, there is no consolidated list of
which ones are good/bad so you're left with trying another one on your
own to see if it impacts the echo.

The TDM04B digium card (as an example) does not use that same pstn
chip, but rather another one from the same chip manufacturer. That
chip does have support for something like 18 different "country"
telco standards.



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Rich Adamson wrote:

[snip]
> The x100p (and presumably the clones) have an integrated circuit on
> the board that was manufactured for use in the US with 600 ohm pstn
> lines. The chip cannot be changed to any other impedance. However,
> there can be many different sources for the echo and impedance
> matching is only one of them. Others include:
>  - incorrect * zapata.conf parameters
>  - poorly engineered motherboards (eg, poor PCI bus, interrupt
> latency)
>
[snip]

There are two types of alternative cards (not starting a discussion on who
made it first!), one called AMI-IA92 (Si3021/Si3012/MD3200) with a FCC
approval and one called AMI-IE92 (Si3021/Si3014/MD3200) with a R&TTE
approval.

The AMI-IE92 have additional components on board for setting AC real/complex
termination as well as DC termination (Japan Mode/FCC Mode/CTR21 Mode).

Both card types are compatible but the wcfxo driver does not utilise the
additional settings on the AMI-IE92 card.

Source:
Chipsets (login required)
https://www.mysilabs.com/public/documents/tpub_doc/dsheet/Wireline/Silicon_DAA/en/si3034.pdf
https://www.mysilabs.com/public/documents/tpub_doc/dsheet/Wireline/Silicon_DAA/en/si3035.pdf

Amigo Communications product sheet (www.amigocom.com)
http://61.31.72.100/amigocom/products/ami_ia92_ie92.htm

/Soren