> From: John Vozza <john@netrom.com>
> Date: Sun, 22 Nov 1998 12:26:37 -0500 (EST)
> Subject: (PM) Increase in "Call Circuit Closed" disconnects - ComOS 3.8
>
> Since installing ComOS 3.8, I have been seeing an alarming number of call
> circuit closed disconnects. As as been discussed MANY times in the past
> this type of disconnect has been explained to mean that for SOME reason
> the remote side has terminated the call and the PM3 received a signal to
> terminate the call from the telco switch. (I use exclusively PRI's)
>
> PLEASE, before flaming me, READ completely what I'm about to say!
>
> I have done extensive testing on this issue and yes the PM3 is responding
> to the signal from the telco switch. HOWEVER, the PM3 appears to be
> CAUSING some, (all?) of the remote side disconnects by DROPPING the PM3
> side modem!
>
> Allow me to justify my conclusion. Tracing the CCC (Call Circuit Closed)
> has been difficult but working with several competent end users we have
> found, via ati11 or at&v1 depending on modems, that the client side is
> seeing a "lost carrier" and terminating the call as it should and
> increasing the setting for carrier interruption has no effect. My original
> thought was padding, or other telco problem ie; bad lines, noise, etc. I
> no longer believe that this is just a telco issue though.
>
> Last night, while working with an MPPP customer I noticed that they only
> had 1 modem up so I wanted to disconnect the remaining modem and force
> their side to re-dial. Inadvertently I did a "reset Mx" instead of "reset
> Sx" and lo and behold after a few second pause I saw the CCC termination
> message for that session. This is 100% reproducible on my PM3's Also, no
> admin reset message was generated. (Yes my stupidity)
>
> To clarify my point, as well as my question, MZ and others have said that
> CCC disconnects are NOT caused by the PM3 but I submit that while
> technically correct that is not always the case. Since the PM3 can "drop
> carrier" due to "operator error" can it not also "drop carrier" due to a
> modem code or OS bug?
>
> I have BCC'd this to support as well and details of the PM3's are;
>
> ComOS 3.8
> All show line[0-1] are clean, 0's across the board.
> All are PRI's from either 5ESS or Seimens switches
> Memory is 4MB
> All modules on except BGP
>
> John
> - -------------------------------------------------------------------------
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> john@netrom.com 973-208-0942 fax
> http://www.netrom.com
> - -------------------------------------------------------------------------
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