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- Path: mail2news.demon.co.uk!genesis.demon.co.uk
- From: Lawrence Kirby <fred@genesis.demon.co.uk>
- Newsgroups: comp.dcom.modems
- Subject: Re: dial in on unix
- Date: Wed, 03 Jan 96 21:24:13 GMT
- Organization: none
- Distribution: world
- Message-ID: <820704253snz@genesis.demon.co.uk>
- References: <4cdk4v$28tu@serra.unipi.it>
- Reply-To: fred@genesis.demon.co.uk
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- X-Newsreader: Demon Internet Simple News v1.27
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-
- In article <4cdk4v$28tu@serra.unipi.it>
- michelotto@mvxpd5.pd.infn.it "Michele Michelotto" writes:
-
- >
- >i have a unix machine (a compaq p5/90 running BSDI) connected to internet via
- >ethernet. I would like to connect to it via dialin on the modem (usr sporster
- >28.8). I can dial out without problem and send initialization string to the
- >modem using a program named tip on unix. But I can't use the modem as dial in.
- >when another model calls it, it answer after some rings, contracts for one
- >or two seconds then drops the communication withour raising the CD line.
-
- I'm not familiar with the precise details of BSDI but I've seen this
- on other types of Unix system. The usual cause of this is that carrier detect/
- DCD isn't being handled properly. The modems connect, the Sportster sends
- the CONNECT message to the host where getty (or whatever) promptly echoes
- it back to the modem. If you send characters to a Hayes compatible
- modem while it is answering it aborts the connect and drops the line. A
- 'quick fix' is to disable result codes in the modem (probably via a DIP
- switch on the Sportster). The correct fix is to get all parts of the
- system configured correctly for DCD. The modem should be set to make DCD
- follow the CD status, again probably with a DIP switch on the Sportster
- otherwise with &C1. On the host you must use a port which responds to
- the DCD signal. This is often referred to as a 'modem control' port.
-
- You may also have to configure the answer speed on the Sportster. Set &B1
- for a fixed speed and store that setting and the speed in NVRAM. When you
- write to NVRAM using &W the currect speed of the interface (i.e. your
- serial port speed) is written out with the rest of the settings, ATI5
- shows the stored value. When the modem autoanswers with &B1 set it
- switches its serial speed to this stored value.
-
- --
- -----------------------------------------
- Lawrence Kirby | fred@genesis.demon.co.uk
- Wilts, England | 70734.126@compuserve.com
- -----------------------------------------
-