[cisco-nas] Unable to connect into AS5350 with some USB modems

[Aaron Leonard]

Patrick,

I don't know anything about this MECER USB modem.  What I can say,
in general, is that when you replace one digital modem with another, 
you will always find that there are A FEW client modems that had
been able to train, that are now no longer able to train. 

One reason may be that the NextPort modems might support more 
features than the TC modems - for example, the
TC modems do not support K56Flex/V.8bis.  So you might turn
off V.8bis (S53=0) and see what happens.  Did your TC modems
support V.92 Quick Connect and Modem on Hold?  If not, you might
try turning off V.92 (S29=6).

Another approach, rather than reconfiguring the NextPort modems,
might be to reconfigure the client modem.  I can't find any command
documentation on these MECER modems, but if they support the 
+MS command, you might try putting +MS=V90 or +MS=V34 into their
extra settings.

Aaron

---

> I have recently installed a Cisco AS5350 and connected to 2 R2 lines (this
> was an upgrade from a 3Com Total Control Chassis - phew!!) I am currently
> running Cisco 5350 IOS Version 12.2(2)XB2 with SPE firmware version 0.8.5.0.
> It seems to be accepting connections from most modems except the following
> USB modem:

> + MECER USB V.90 56k FAX/MODEM FCC ref. No. MQ4USM560
> + FCC ref. No. H52PT-3050

> The connections from these modems are characterised by prolonged
> hand-shaking with no ultimate connection. Typical errors include "...Modem
> did not respond.." (even after the handshaking has taken place!!!) We have
> tried with a large number of analogue telephone lines with the same result.
> Interestingly enough, when I use a USR USB modem, connection is established
> without a problem. In addition, the same USB modem was able to connect on
> the Total Control previously with no problems. Is there a setting I have
> missed on AS53509 that does not allow connections from certain modems? Is it
> a compaitbility problem?

> Rgards,
> Ndegwa


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