RE: [nsp] Weird PPP problem with NM-8AM in 2610

From: Aaron Leonard (Aaron@Cisco.COM)
Date: Wed Jun 12 2002 - 12:51:55 EDT


Simon,

If you're willing to "try pretty much anything",
then please allow me to repeat my original response to you,
with emphasis added.

  I'd probably first try upgrading from 12.0(2a)T1. I'd start with
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^
  12.2(10a) (if feasible) in order to pick up the latest NM-AM
  ^^^^^^^^^
  firmware. (If that isn't an option, I'd go to 12.1(latest) [which
  should require no more memory than 12.0T] then manually upgrade to
  1.2.2 firmware from http://www.cisco.com/pcgi-bin/tablebuild.pl/x600-analog .)

[ yes there is a good chance of relevant IOS fixes between
  12.0(2a)T1 and 12.2(10a) ]
   
  If that doesn't provide relief, then one would want to open a
                                                         ^^^^^^
  TAC case and do some serious troubleshooting. This would involve
  ^^^^^^^^
  varying the client modem, the circuit, and the server modem, and
  ^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^ ^^^^^^^^^^^^^^^^
  examining the octets sent and received on each end of each call,
  ^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^ ^^^^^^^^
  in order to assess the scope of the problem.

As it turns out, troubleshooting modem problems is hard.

Regards,

Aaron

---

> Thanks for all your help, guys.

> I have already manually updated the modem firmware to > 1.2.2 ( c3600-2600-analog-fw.1.2.2.bin ), and the > log I originally posted was running with that firmware.

> Are there some additional fixes in 12.2(10a) or 12.1(x) > beyond the firmware upgrade?

> I have just spent the last couple of days trying pretty > much every possible combination of S-Registers at both > ends, and I will try pretty much anything at this point!

> Thanks again

> Best Regards, > Simon Hailstone

> //>>-----Original Message----- > //>>From: Niels Bakker [mailto:niels=cisco-nsp@bakker.net] > //>>Sent: 12 June 2002 00:55 > //>>To: Aaron Leonard > //>>Cc: Josh Duffek; cisco-nsp@puck.nether.net; > //>>cisco-nas@external.cisco.com > //>>Subject: Re: [nsp] Weird PPP problem with NM-8AM in 2610 > //>> > //>> > //>>Hi, > //>> > //>>* Aaron@Cisco.COM (Aaron Leonard) [Wed 12 Jun 2002, 01:11 CEST]: > //>>>>> Wrong. V.34 supports speeds from 2400 bps through 33600 bps. > //>>>> I'm getting confused here. Maybe when falling back to > //>>lower speeds when > //>>>> the other end is also V34 and connecting at 28800 > //>>doesn't work; but I > //>>>> suppose not when talking to a V22bis modem, then it'll > //>>have to speak > //>>>> V22bis to it, right? > //>>> Right. If a V.34 modem is talking to a modem that > //>>supports V.22bis > //>>> (but nothing faster), then they would (ideally) train in V.22bis. > //>>> It is not required that a V.34 modem support V.22bis, but > //>>in practice > //>>> they all do. > //>>> > //>>> In some cases, when you configure a modem that supports both > //>>> V.34 and V.22bis for operation at 2400 bps, it will choose > //>>> V.22bis; other such modems will choose V.34 in that case. > //>> > //>>Right. And from the logfile included by the original > //>>poster it's clear > //>>the the handshake is at V22bis, so I'm not completely crazy > //>>here. :-) > //>> > //>>Thanks for the clarification. In the future I think I > //>>should refrain > //>>from reading mail while trying to reverse engineer some > //>>HTML pages... > //>> > //>>Regards, > //>> > //>> > //>> -- Niels. > //>> > //>>-- > //>>"I've been putting ``Create instantaneous people > //>>transporter'' on people's > //>> task lists forever, but I've yet to see any of them > //>>deliver results! > //>> ...I'm a failure as a project manager." > //>> -- L@koonts.com > //>>



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