RE: [Asterisk-Users] modem to modem calls through asterisk

[Don Pobanz]

Replacing my zhone channel bank with an Adtran 750 has fixed my modem - 
modem connect speed problems.

I don't know whether this is something unique to zhone channel banks, 
my particular zhone channel bank or my  installation/configuration. 
Regardless, it is good to have identified the problem.

Don Pobanz

On Tuesday, November 25, 2003 5:52 PM, Don Pobanz 
[SMTP:[EMAIL PROTECTED] wrote:
 Modem connect speeds on calls through * seem to be lower than calls
 made through the telephone company lines or our old Rolm PBX. All 
data
 calls have 2 wire analog modems on both ends.

 For my set up I have channels of a Zhone channel bank tied to 2
 modems.
 The Zhone channel bank interfaces my * server with a T400P card.
 modem  --- Zhone Channel bank - * via T400P card - Zhone channel bank
 -
 modem

 In extensions.conf I have added the 'd'ata option.
 exten = 333,1, Dial(Zap/19,,d)

 In zapata.conf echo cancel has been turned off and I have 
experimented
 with different size jitterbuffers, none of which seem to help.

 I couldn't find anything else in the archives. Other suggestions?

 Don Pobanz

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Re: [Asterisk-Users] modem to modem calls through asterisk

[Gary Mart]

On Tue, Nov 25, 2003 at 05:51:37PM -0600, Don Pobanz wrote:
 Modem connect speeds on calls through * seem to be lower than calls 
 made through the telephone company lines or our old Rolm PBX. All data 
 calls have 2 wire analog modems on both ends.
 
 For my set up I have channels of a Zhone channel bank tied to 2 modems. 
 The Zhone channel bank interfaces my * server with a T400P card.
 modem  --- Zhone Channel bank - * via T400P card - Zhone channel bank - 
 modem
 
 In extensions.conf I have added the 'd'ata option.
 exten = 333,1, Dial(Zap/19,,d)
 
 In zapata.conf echo cancel has been turned off and I have experimented 
 with different size jitterbuffers, none of which seem to help.
 
 I couldn't find anything else in the archives. Other suggestions?

Could you be suffering from an extra digital - analog conversion?
Each conversion between analog and digital hurts performance.  (56k
modems are faster than 33.6 modems because there is no digital -
analog conversion on the ISP side.)

I have PRI lines and just few days ago, I posted a reply to subject:
Echo Cancellation, TDMoE fails, X100P works that includes a detailed
explanation of my setup that runs v.90 modems at full speed through *.

Gary

 
 Don Pobanz
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