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Article #18100

NO CARRIER - 9 out 10 times - Motorola 3400

#18100
From: Dave English
Date: Wed, 27 Nov 1996 00:00
98 lines
4111 bytes
In article <8AJ4nLActtmyEw3y@eraserco.demon.co.uk>, Malcolm Loades
<sales@eraserco.demon.co.uk> writes
>Apologies if this has been previously discussed here - I only look in
>when I've got a problem!  I'm trying here first because I thought I saw
>a similar thread sometime ago when I had no problem.
>
>My system is P75, 24Mb RAM, 1650 UART, Win 3.11, TP 3.01 with a Motorola
>3400 (Pro?) 28.8 external modem.  The modem string is currently
>AT&FMY0&D3&R0\\N7\\V4%/r.  This setup has remained unchanged for around
>12 months.

Hello again Malcolm.

>Initially I would get the NO CARRIER message very occasionally, like
>once in 50 diallings, now it is becoming more and more frequent to the
>point where in the last few days it is a genuine 9 out 10 attempts.

Sorry to hear that.

>It seems to make little difference which access number I try - 01488
>which is local, or any of the 0845 numbers.
>
>Is my problem a modem problem, string problem, Demon problem, or what?

It seems a little unlikely that it could be a Demon problem, given that 
the problem occurs for all access numbers.  I assume you have tried the 
beta COLT, that is on 0845 3535666 .

I would be happy to help you try changing the string to try to avoid the 
problem, wherever it is.

It could be that your modem is gradually becoming faulty, but that is 
rather unlikely.  That kind of equipment more commonly fails completely 
and suddenly.

Have you considered the possibility that it could be a gradual 
degradation in your telephone line, that is more common than gradual 
modem failure.

The simplest way of testing this is to try calling from another
telephone line, where that is practical.

Another possibility is that the problem is caused by something else 
connected to the telephone line.  You ought to try temporarily 
disconnecting any other equipment: telephone handsets, answering 
machines etc. from the line to see if the loading is having an effect.  
Even equipment which is turned off can affect the quality of the line.

If you have the time to spare, then I would appreciate seeing some 
response information from your modem.

Please could you e-mail to me the output of some AT commands for your 
modem.   You can do this from your favourite DOS terminal program, from 
Windows Terminal or Windows 95 HyperTerminal.

In Windows Terminal you just need to change the communications settings 
to the COM port of your modem, hardware flow control, no parity and say 
19,200 baud.

First type in the letters AT and press carriage return.  You should see 
the modem respond OK.  You can then type in each command line in turn.  
In windows you can then cut and paste the results from the modem into a 
message.

I principally need to see the output of an AT&F&V command.  If you have
the patience, then I would be interested to see the results from this
longer list:

AT&F&V
AT&V2
ATI0
ATI1
ATI2
ATI3
ATI4
ATI5
AT+FMFR?
AT+FMDL?
AT+FREV?
AT%V

It may be that some of these lines will simply respond OK, because they 
are not implemented on your modem, some may also respond ERROR because 
they are not recognised at all by your modem.  So these responses do not 
necessarily mean that you have typed something wrong, if you just show 
me the result then I can decide.

>Thanks in advance for your help.

Please excuse me if I have unnecessarily repeated anything from our 
earlier conversation.

Regards
-- 
Dave English, T U R N P I K E  Ltd
Dorking Business Park, DORKING, Surrey, UK. RH4 1HN
My other computer's a brain
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From: Dave English <DavidE@turnpike.com>
Subject: NO CARRIER - 9 out 10 times - Motorola 3400
Date: 1996/11/27
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