-jeremy
At 10:19 PM 7/9/97 -0600, Ron Tapia wrote:
>Equipment:
>
> PM3
> 3 '10 port' cards
> CT1, E&M immediate start, B8ZS, ESF
>
> Calling in with a Cardinal 28.8
>
>Ticket: 40016 (not that I've been called or anything)
>
>I've seen a lot of lost carriers with 3.5.1b20.
>
>In addition, I've been seen a problem where a connection will hang and
>either unhang or die due to a loss of carrier.
>
>The hangs seem to be associated with retrains (maybe renegotiations). These
>hangs can last many minutes (recollection, I haven't timed anything yet) and
>can seem permanent (i.e., before I thought that the connection was dead and
>I'd hang up). It's just now what I've realized that my connections can
>unhang.
>
>It seems like my PM3 is retraining/renegotiating much too often for
>usability (or it's taking to long to do one or the other). Is it possible
>that 3.5.1b20 is a little too sensitive to line noise (for US West
>territory)?
>
>Just in the course of writing this message I've experienced several hangs
>and two hangs followed by disconnects. I'm beginning to favor the
>hypothesis that the hangs and disconnects are related and are both
>related to the sensitivity of the 3.5.1b20 code to line noise.
>Is there a better explanation?
>
>Here's a full description for those interested. I'm hoping that it will
>help others that see this problem know what to look for. If other info
>would be of help, please let me know.
>
>My PPP session was "hung" it was on m0. I was connected on another phone
>line and on the PM3 in question. Here is "show m0":
>
>==========================================================
>dpm1> show m0
> State: ACTIVE
> Active Port: S0
> Transmit Rate: 28800
> Receive Rate: 26400
> Connection Type: LAPM/V42BIS
> Chars Sent: 70837038
> Chars Received: 10681725
> Retrains: 1
> Renegotiations: 0
>
> Total Calls: 197
> Modem Detects: 192
> Good Connects: 170
>
> Connection Failures
> No Modulation: 13
> No Protocol: 13
> Not Operational: 9
> Total Failed: 22
>
> Session Terminations
> Lost Carrier: 0
>Normal Disconnect: 169
>==========================================================
>
>I was typing into a telnet window and I could see the "send" light on my
>modem blinking, but I never received responses. This lasted about a
>minute. Suddenly, my connection came back, my characters were echoed in
>my telnet session and "show m0" gave:
>
>==========================================================
>dpm1> show m0
> State: ACTIVE
> Active Port: S0
> Transmit Rate: 21600
> Receive Rate: 21600
> Connection Type: LAPM/V42BIS
> Chars Sent: 70855214
> Chars Received: 10683091
> Retrains: 2
> Renegotiations: 0
>
> Total Calls: 197
> Modem Detects: 192
> Good Connects: 170
>
> Connection Failures
> No Modulation: 13
> No Protocol: 13
> Not Operational: 9
> Total Failed: 22
>==========================================================
>
>
>After only 1 other noticable hang "show m0" gives:
>
>==========================================================
>dpm1> show m0
> State: ACTIVE
> Active Port: S0
> Transmit Rate: 26400
> Receive Rate: 26400
> Connection Type: LAPM/V42BIS
> Chars Sent: 71057433
> Chars Received: 10882282
> Retrains: 3
> Renegotiations: 8
>
> Total Calls: 197
> Modem Detects: 192
> Good Connects: 170
>
> Connection Failures
> No Modulation: 13
> No Protocol: 13
> Not Operational: 9
> Total Failed: 22
>
> Session Terminations
> Lost Carrier: 0
>Normal Disconnect: 169
>==========================================================
>
>As I was composing this, I saw another hang, "show m0" gave:
>
>==========================================================
>dpm1> show m0
> State: READY
> Chars Sent: 71101167
> Chars Received: 10908630
> Retrains: 4
> Renegotiations: 8
>
> Total Calls: 197
> Modem Detects: 192
> Good Connects: 170
>
> Connection Failures
> No Modulation: 13
> No Protocol: 13
> Not Operational: 9
> Total Failed: 22
>
> Session Terminations
> Lost Carrier: 0
>Normal Disconnect: 170
>==========================================================
>
>This time, instead of "unhanging", I lost carrier. I reconnected and got
>the same modem.
>
>Here is "show modems":
>
>==========================================================
>dpm1> show mod
>Mdm Port Status Speed Compression Protocol Calls Retrain Disconnect
>--- ---- ------ ----- ----------- -------- ------ ------- ------------
>M0 S0 ACTIVE 28800 V42BIS LAPM 171 0 LOST CARRIER
>M1 S1 ACTIVE 26400 V42BIS LAPM 292 0 NORMAL
>M2 S2 ACTIVE 26400 V42BIS LAPM 268 0 LOST CARRIER
>M3 READY UNKNWN NONE NONE 290 0 NORMAL
>M4 S4 ACTIVE 21600 V42BIS LAPM 212 0 LOST CARRIER
>M5 S5 ACTIVE 28800 V42BIS LAPM 185 0 LOST CARRIER
>M6 READY UNKNWN NONE NONE 149 1 NORMAL
>M7 READY UNKNWN NONE NONE 88 0 LOST CARRIER
>M8 READY UNKNWN NONE NONE 62 0 LOST CARRIER
>==========================================================
>
>It shows that M0 last disconnected because of a lost carrier.
>
>While composing this, I saw another hang followed by a loss of carrier.
>
>Thanks for your time,
>
>Ron
>
>--
>Hagbard@LambdaMOO % It's not a clique, it's a cabal.
>Ron@JaysHouseMOO % ...and there is no cabal.
>Ron@MediaMOO %
><A HREF="http://www.nmia.com/~tapia/">My home page</A>
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