Modem speeds through M1.

[Gumpus]

Hello,

I was asked what modem speeds to expect through our PBX. A modem call will dial in to a DID that reoutes through a T-1 then terminates on an analog station (500 set).

Thanks in advance,

Gumpus

 

[wdhb]

Nortel will only guarantee 9k6, but I have run 56k modems without any issues & they do run at the same speed as for POTS lines

 

[Gumpus]

Thanks for the quick reply!

 

[rtycka]

And what about incoming calls to modem?
I get max. speed 33.6Kbps.
Any ideas?

 

[Tritonv10]

GUMPUS,What vintage card do you have? I discovered that any analog card NT8D09XX with a vintage of BA or later will run 56K, anything prior may or may not.

 

[jgideon]

If it terminates on an analog station, whatever is answering it can only do 33.6. The only way to get faster than 33.6 is to have the modem call terminate into a device that is connected via a T1 interface or a BRI interface (i.e. all digital into the access server device.) When you dial in to an ISP or other big 'server' farm, you are connecting at a high-speed 'down', but the maximum from the remote modem to the 'host' will always be 33.6.