Xref: utzoo news.newusers.questions:2727 comp.dcom.modems:6671 Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!apple!goofy.apple.com!esmith From: esmith@goofy.apple.com (Eric Smith) Newsgroups: news.newusers.questions,comp.dcom.modems Subject: Re: Modem Speed Message-ID: Date: 6 Sep 90 21:46:00 GMT References: <1664@gvgpvd.GVG.TEK.COM> <1990Aug30.023220.8554@ncsuvx.ncsu.edu> <659@texas.dk> <1990Sep4.150259.12379@savant.uucp> Sender: usenet@Apple.COM Organization: Frobozz Magic Widget Company Lines: 18 In-reply-to: jon@savant.uucp's message of 4 Sep 90 15:02:59 GMT In article <1990Sep4.150259.12379@savant.uucp> jon@savant.uucp (Jon Gefaell) writes: > Will misinformation never cease? I'll add to it now: > > The PEP method uses up to 511 7Hz 'channels' each having one baud. Each > channel is 'tested' to determine whether that baud is stable enough to > encode 2, 4 or 6 bits (FSK, PSK, QPSK respectively) Yes, misinformation will never cease. The 511 channels are each approximately 7 baud. If they were 1 baud, the highest bit rate thoretically possible with the modem would be 3066 bps. At 7 baud each, the maximum is 21462, of which some is lost since not all carriers will actually be able to encode 6 bits/baud, and some is lost due to packetizing and error handling. -- Eric L. Smith Opinions expressed herein do not necessarily reflect those esmith@apple.com of my employer, friends, family, computer, or even me! :-)