Re: (ASCEND) Disconnect Issues on TNT's?

[Tim Basher <basher@ces.cwru.edu>]

> This difference between whether code 185 or 11 is normal or not has been
> an ongoing issue judging from the archives but maybe someone can clear
> this up once and for all?

I doubt it.

I believe that it all depends upon the service you are offering.  Neither
one is a definite indication of a problem.  Neither one can be clearly
ignored.

If the client is using PPP and their software is correctly written, and
no problems ever occur on the remote end or somewhere in the circuit or
... then you would only expect to receive Disconnect Cause code 45
(LCP Terminate).

But if you are offering non-PPP services (SLIP, TCP-CLEAR, TELNET) then
you should expect to receive either a Disconnect Cause 11 or 185 even
when no problems occur.

Disconnect Cause 11 appears to occur when the MAX has not received a
message indicating that the channel has been disconnected, but the modem
no longer detects carrier.  Disconnect Cause 185 appears to occur when the
MAX is told by the PRI/BRI that the channel has dropped and the message
is passed on to the modem.

I don't see anyway for Ascend to discriminate between "expected" Disconnect
Cause 11/185 and "unexpected" Disconnect Cause 11/185.

Quoting from the FAQs on the Ascend web site:

  Disconnect cause code 11 reports when modem carrier loss is detected.
  The following situations contribute to code 11:

  1. The modem driver polls the status of the DCD bit of all modems actively
     connected. If the DCD bit (carrier) changes from 1 to 0 then stays at
     0 for 3 consecutive 100ms time periods, we consider the carrier to be
     lost, and cause code 11 is reported.

  2. If the modem driver detects loss of DCD (carrier) before processing
     the LCP termination packet, code 11 is reported.  If the LCP termination
     packet were processed first, the cause code would be 45.

  Note: This list details the most common situations; the list is not
  comprehensive.

http://aos.ascend.com/aos:/gennavviewer.html?doc_id=090005d680002a41&doc_header=terminal

  Disconnect cause code 185 is reported when the modem driver "thinks" that
  the remote end has hung up.  The following situations all contribute to
  code 185: 

    1. Users power off their modem while connected. 
    2. Users power off their computer while connected. 
    3. Users disconnect the analog lines while connected. 
    4. The modem retrains but does not reconnect. 
    5. The T1 or PRI line bounces.

  Note: The list details the most common situations; it is not all
  encompassing.

http://aos.ascend.com/aos:/gennavviewer.html?doc_id=090005d680002a37&doc_header=terminal
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