[cisco-nas] Re: [c-nsp] AS5300 Dropped Calls

Aaron Leonard Aaron at cisco.com
Mon Mar 28 11:14:27 EST 2005


Troubleshooting modems




Eric Knudson wrote:

>(dropping nsp and adding nas)
>On Thu, 24 Mar 2005 17:46:05 +0200, Mark Tinka
><mtinka at africaonline.co.sz> wrote:
>>Hi all.
>>I have a situation where some customers may drop calls after a few
>>seconds-to-minutes of dial-up connection. In some cases, either the phone
>>line (noisy), modem or modem driver has been the cause, and problem
>>In other cases, phone line's good (even less than <= 800m from CO), modem and
>>modem configuration are in order, but the line will still cut after a few
>>moments of connectivity.
>>The AS5300 has been configured for 56K access. I have tried different
>>modulation schemes to try and solve this problem, testing v.90 and v.92 (v.34
>>won't offer over 33.6Kbps, and some customers can support 52Kbps with no line
>>drops, but haven't tested it long enough to confirm problem resolution).
>>So I left the async lines to auto-negotiate line parameters with the customer
>>once they connect, but that doesn't seem to have solved the problem. What's
>>strange is that a previous purely analog NAS didn't have this problem (unless
>>the customer had an idle-timeout set).
>>Anyone have any idea how the AS5300 can be tuned to deal with this? PRI lines
>>have been delivered on HDSL/G.703, and D-channel interfaces on the AS5300
>>aren't reporting any line errors.
>>All help appreciated.
>>cisco-nsp mailing list  cisco-nsp at puck.nether.net
>>archive at http://puck.nether.net/pipermail/cisco-nsp/
>cisco-nas mailing list
>cisco-nas at puck.nether.net

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