[cisco-nas] AS5300 Dropped Calls
mtinka at africaonline.co.sz
Mon Mar 28 07:00:56 EST 2005
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.
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