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Article #17870

33600 modem will never connect beyond 24000

#17870
From: Daniel Wilson
Date: Sun, 02 Feb 1997 00:00
90 lines
2836 bytes
Details of my setup are - =


Rockwell (non RPI) =


one of the chips has - =


RCV288DPi
R6682-24
ROCKWELL 95
9619 B10435-7

written on it.

It is supposedly capable of 33.6kb/s however I can only ever connect at =

no more than 24kb/s (thats if I'm lucky, usually its around 21.6 or 19.2, =

it does go down to 14.4 or 7.2 some times)

I've digested manuals, AT command books trying to put together a good =

init string but no matter what I do, no AT command can make it go faster. =

I bought the modem from Solwise modems in Hull (www.demon.co.uk/solwise)
When I FORCE a 33.6 connect it completly spams out on me, my dialler =

(trumpet winsock v.3) screen fills up with garbage in no time at all. I =

try to force a 28.8 connect but it still connects at 24kb/s.
I'm at my wits end, other than taking the damned thing back I've no other =

ideas. =


Other things I've tried are - =


getting BT to test the line (tested ok). I did tell them it was a modem =

connection (they are not required to give line quality that will support =

anything above 2.4kb/s) but they said it should connect at 33.6 no probs.
it didnt work.

I got BT to keep the auto gain control on the line static (which should =

avoid conflicts with the modem's own gain control). That didnt work.

I've messed around with the house wiring, and taken the computer to the =

master socket downstairs. Still connects at 24kb/s. =


I've messed around with serial ports and IRQ's in my machine.
didnt work.
I have a 16550 uart but as its an internal modem it shoudl matter =

anyway.

I'm thinking the on-modem serial port might be a 8450 uart and therefore =

reduce computer-modem throughput, but surely that shouldnt affect the =

connect speed. And what manufacturer would use a slow uart on a fast =

modem ?

Please help ! I've forked out a good =A3100 for this modem and I'm feeling =

I should have gone for a 28.8 for all the good its done me.

rockwell RPI modems have no error correction on the modem itself but I'm =

assured this one is NonRPI and *does* have error correction on board.

if there is anyone who can help, I'd be very grateful for any you could =

give me !

many thanks in advance,

-- =

***************
Daniel Wilson
daniel@dwilson.demon.co.uk
Technical Details
Message-ID: <32F4CC84.607F@dwilson.demon.co.uk>
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From: Daniel Wilson <daniel@dwilson.demon.co.uk>
Subject: 33600 modem will never connect beyond 24000
Date: 1997/02/02
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