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From: roh@gmdzi.gmd.de (Peter Rohleder)
Newsgroups: comp.dcom.modems
Subject: Modem settings outside of the USA
Keywords: Modem settings Bell CCITT
Message-ID: <4476@gmdzi.gmd.de>
Date: 5 Apr 91 13:50:25 GMT
Organization: GMD, St. Augustin, F.R. Germany
Lines: 33


Recently I purchased a 2400 Baud Modem (Global Village Teleport) for my
Macintosh in the USA.

In the manual of the modem you can read that there may be a few settings
which need to be changed if you use it outside of the USA.

They mentioned following settings:

1. Bell/CCITT:
Default setting instructs the modem to operate in Bell 212A mode(1200 bps)
or Bell 103 mode(300bps).
It can be changed to operate in CCITT V.22 mode(1200 bps) or V.21 mode (300bps).

2.Guard Tones
Default setting is to use a 550 Hz guard tone
It can be changed to use 1800 Hz guard tone or
to use no guard tone

3.Make/Break Pulse Ratio
Default setting is to use make/break = 39/61 without adaptive dialing
It can be changed to use a make/break ratio = 33/67 without adaptive dialing.

Does anybody know if I have to change some of these default settings if
I'm going to use the modem in Germany.

Peter Rohleder

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  Peter Rohleder, roh@gmdzi.UUCP, (+49 2241) 14-2208
  German National Research Center for Computer Science (GMD)
  Schloss Birlinghoven, P.O.Box 1240, D-5205 St. Augustin 1, FRGermany
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