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From: keating@motcid.UUCP (Edward Keating)
Newsgroups: comp.dcom.modems
Subject: Re: Cellular phones and modems
Message-ID: <7165@bone34.UUCP>
Date: 20 May 91 15:07:42 GMT
References: <53.282EC496@zswamp.uucp> <1991May14.080415.28245@telebit.com>
Organization: Motorola Inc., Cellular Infrastructure Div., Arlington Heights, IL
Lines: 21

In article <1991May14.080415.28245@telebit.com>, brian@telebit.com (Brian Lloyd) writes:
> You will need a device that provides an RJ-11 connection for your
> modem.  There are such devices available (I have used a device called
> Cell Jack).  This device generates the signals expected by the modem
> (dial tone, ring voltage) and it decodes the touchtones so that the
> modem or other attached device can dial the cellular transceiver.

On Motorola products there is an option call the "Cellular Connection" which
adds the RJ-11 jack and capability to interface to modems, etc.

Back in June 1988, I used a USR HST 9600 to dial via a Cellular Connection
through a LD trunk to Chicago from Peoria. I had the opportunity to examine the
signal on a station analyzer that was connected to the antenna of the cell site.
(I was at the switch site that had a co-located cell.)
The 9600bps signal stayed within the bandwidth of the channel and I made the
connection into our network in Chicago. After about 30 minutes of operation, the
link disconnected with too many link errors. I attempted to reconnect, but it
took several tries to get the link back at full speed. I dropped back to 
2400bps which worked fine and had no problems. We did check out the signal at
2400 and found that it was a bit hotter than the 9600 and was pushing its 
bandwidth past the maximum allowed. (We did not see any adjacent channel problems.)