home *** CD-ROM | disk | FTP | other *** search
- Alex Lang wrote:
- >
- > In <313F76CA.384E@interramp.com>, Richard Mork <cd001847@interramp.com> writes:
- > >Southwestern Bell in Houston told me they only 'guarantee 2400 baud'.
- >
- > But since V.32bis uses 2400 baud at 6 bits per baud they will
- > guarentee 14400 bits per second. Remember that there is a big
- > difference between "bits per second" and "baud" in the brave new
- > (well, actually old) world of trellis coding. In fact, using 2400
- > baud at 9 bits per baud in V.34, they will guarentee 21600 bits per
- > second.
-
- I always get a chuckle out of things like this. For the record, though:
- the telcos always confince the Public Utility Commissions that they
- *really* meant V.22bis and 203A data modems, and the slowest speed for
- Group 3 fax machines.
-
- Pacific Bell put in their original 1MB and 1FL tariffs that they would
- handle "4800 baud", but quickly amended their filing to make that read
- "4800 bps" when they discovered their mistake. (Hint: you can't get
- 4800 baud [symbols/second] across a voice-grade telephone line; the
- practical limit is around 3800 baud.)
-
- By the way ANSI committeee T1A1 specifies "must-repair" limits of
- impairments that are so high that you would have problems gettting
- 121A or V.22 modems to run over the access circuits. FWIW
-
- ---
- Stephen Satchell, Satchell Evaluations
- Testing modems and telecomm gear for magazines since 1984
-