01-06-2003 09:41 AM - edited 03-02-2019 03:58 AM
Hello!
Currently I have a 2621 with a 8 port anlog modem module. I can only get the modems to connect at 21600bps. It is using V.34, so I assume it should connect at 33600bps.
Any idea how I can't get the speed on the connection up to 31000 to 33600 ??
Here is the modem version
sh modem ver
Slot 0:MCOM Analog Integrated Modem Firmware Version 1.2.8
Source: IOS
Boot firmware: 1.1.5
MIMIC firmware: 1.3.3
Modem firmware: 2.3.17
DSP firmware: 0.0.2
Here is the config
interface Group-Async1
ip unnumbered FastEthernet1/0
ip helper-address x.160.1.235
ip helper-address x.160.1.234
encapsulation ppp
no ip mroute-cache
dialer in-band
dialer idle-timeout 10000
async mode interactive
peer default ip address dhcp
no fair-queue
compress mppc
ppp max-bad-auth 3
ppp authentication pap use-radius
group-range 1 8
line 1 8
session-timeout 60
exec-timeout 0 0
modem InOut
modem autoconfigure type mica
no exec
transport preferred none
transport output none
autoselect ppp
flowcontrol hardware
Thanks
Randy McIver
01-10-2003 08:24 AM
The issue here could be two things.
One is modem compatability, as different users will be using different modems they will agree to connect at a speed compatible to both the modems. All RAS boxes will have incorporated the parameters for well known modems for other modems you may have to add the AT commands in the RAS boxes.
If you are using Cisco Access Servers maybe this URL could give you an idea about the list of compatible modems.
http://www.cisco.com/en/US/products/sw/accesssw/ps4455/prod_release_note09186a008007e613.html
The other problem is with the line itself if there are more errors in the Channalised E1/T1 there could be speed lose, for this contact your Telecom provider.
01-14-2003 05:41 PM
I have had router installations with analog modem modules (e.g., NM-8AM)
and I have seen that this module is quite sensitive to grounding.
I suggest you ensure you have proper grounding as this affects modem performance.
To achieve higher connection speeds, the quality of the line really has a
very big contribution, based on experience. But you can try using the locals
(from PBX) to make sure that you can achieve 31000 and above speeds.
Also, you have the command "modem autoconfigure type mica" under
"line 1 8".
Please take note that analog modems for the 2600 series are microcom (mimic) modems. Sometimes "modem autoconfigure discovery" works well but you can try using "modem autoconfigure type microcom_mimic".
Use "show modem connect-speeds" to display connection speed statistics for all the modems running in the router.
Hope this helps.
01-15-2003 06:19 AM
Thanks for the feed back. You where dead on in both cases, the modem set was incorrect. I changed it back to modem auto discover and now works. Some times I can can connect at 31kbs and other times it connects at 28.8kps. That is with the modem in my laptop, when I try a USR it consistly connects at 31kbps. So needless to say my laptop modem is not of high quality.
Thanks for your help, take care !!
Randy M.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide