Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: John Boteler Newsgroups: comp.dcom.telecom Subject: Crosstalk on Long Distance Message-ID: <6132@accuvax.nwu.edu> Date: 6 Apr 90 03:58:10 GMT Sender: news@accuvax.nwu.edu Organization: TELECOM Digest Lines: 33 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 10, Issue 237, Message 3 of 8 I accomodated the Moderator by not enclosing quoted text. I also followed the age-old recommendation of USEnetiquette by reading all replies to this message before replying myself. I am glad I did; it was quite amusing to see how the discussion took on a tangential life of its own :) My best guess is that since the original poster described this as a long distance call over AT&T, the microwave transceivers his friend's call traversed were out of tune. This is not uncommon, even with today's ubiquitous fiber circuits. I have heard a similar occurence on many LD calls in the past, by and large over AT&T. The sidebands of adjacent channels could be heard, sometimes clearly, many times sounding just like Donald Duck. Each path in such a call occupies one multiplex channel, one going out and one coming back. Stack them up on a wideband circuit and your path to Cornell is sitting next to someone else's (who is talking to her Auntie May in Kansas). You hear Auntie May and not her niece because only Auntie May's channel is next to yours and the channels may be out of tune enough such that her sideband slops over into your channel. In any case, this is a much more likely explanation than getting tephone calls from all over the world every time it gets the least bit damp or wet. John Boteler {zardoz|uunet!tgate|cos!}ka3ovk!media!csense!bote NCN NudesLine: 703-241-BARE -- VOICE only, Touch-Tone (TM) accessible