Ian, A Bell 202 is actually 1200 bps half duplex in a POTS configuration. It could only do full duplex in the 4 Wire Leased Line configuration. Certain 4W versions were also capable of 1800 bps.
The 300 bps modem was either Bell 103 or CCITT V.21. Incidentally, my first modem design was a Bell 202A, that was in late 1969. After that there were many custom designs. The last one was in 1990. I'd be glad to share the information I have. Exactly what Bell 202 information do you need? The original 202 specs are somewhere in my archives, but I must warn you. The verbage will be tough to understand, unless you are conversant in Bell speak. Duane >From: "Ian Chapman" <[email protected]> > >Hi, > A friend of mine would like to know about the old data set 202. >Often called the penny whistle modem. That's FSK 300 bit/sec originating >and answering frequencies really antique stuff. The older ones had acoustic >data couplers. Any help I can dig up information for him would be greatly >appreciated. > > Regards Ian. > >
