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000126_news@columbia.edu _Wed Apr 23 19:42:48 1997.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: No carrier, after getting connected
Date: 23 Apr 1997 23:42:44 GMT
Organization: Columbia University
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In article <01bc5050$dac0b780$322bcdce@Jspencer>,
Jesse Spencer <spencer@mjsi.com> wrote:
: I am having problem with no carrier messages from Kermit.
:
NO CARRIER is a message from the modem and indicates that it failed
to negotiate a modulation technique with the other modem. It has
nothing at all to do with Kermit except insofar as Kermit has sent it
some setup strings.
: When dialing with
: Kermit from a VAX or ALPHA running VMS 6.1 to the same I keep getting no
: carrier. I have upgraded to version 6. but that has not helped. This only
: occurs when dialing from a U.S. Robotics 28.8 or 33.6 to a 28.8/33.6. If
: either the modem dialed into is a 14.4 or out of is a 14.4 there is
: noproblem.
:
Did you tell Kermit to "set modem type usr" prior to dialing? If not, then
Kermit is probably not sending the correct setup string.
: The modems connect and if I set dial display on, I can see it
: actually gets a username, but then it just sits there try to negotiate
: something and returns a no carrier message to the screen with a modem
: message: "No Connection."
:
So NO CARRIER comes shortly after a connection has been made? Again, it's
a problem between the two modems, having to do with their configuration,
or possibly having to do with whatever is connected to the remote modem.
: The serial port rate is 19200 and the settings on
: the modems are identical.
:
If you use V.32 (28.8 or 33.6) when your serial port speed is 19200 bps you
had better be sure you have *bidirectional* RTS/CTS flow control enabled in
both modems, and both serial ports that the modems are connected to, since
otherwise the modems will overrun the serial ports.
I suspect the remote modem is overrunning the serial port of the thing it is
connected to (a DECserver?), and so the DECserver is hanging up on it.
Hardware flow control is a major issue here. If DECservers are involved, I
recommend you read section I.4 of the CKVINS.DOC file that comes with VMS
C-Kermit 6.0.
- Frank