telecom@ucbvax.ARPA (08/15/85)
From: Moderator <Telecom-REQUEST@MIT-XX.ARPA> TELECOM Digest Wednesday, August 14, 1985 7:28PM Volume 5, Issue 18 Date: Tue, 13 Aug 85 17:11:25 PDT From: "David G. Cantor" <dgc@LOCUS.UCLA.EDU> Subject: Details of call-forwarding My local operating company (General Telephone) is finally offering call forwarding. As I understand it, even though calls are being forwarded, I can still place outgoing calls. Suppose I am placing an outgoing call from a line which has call forwarding in effect. If a friend calls my number, will he receive a busy signal or will his call be forwarded? Or will something else happen? (I'm assuming that the number I'm forwarding to is not busy and that circuits are not busy, etc.). Is it possible that details of call-forwarding, such as the above, vary from operating company to operating company, or is there an industry standard for call-forwarding and other special services? dgc ------------------------------ Date: Tue, 13 Aug 85 20:30:34 EDT From: Keith F. Lynch <KFL@MIT-MC.ARPA> Subject: 976 numbers Here in the Washington D.C. area, there are now local phone numbers which cost extra to dial. They all begin with 976. For instance there is one that will give you stock quotes. It's a sort of reverse 800 service. Does anyone know more about these? How much does the company get from each call? Do any other cities have anything like this? ...Keith ------------------------------ Return-Path: <dual!mordor!seismo!munnari!basser.oz!john@UCB-VAX.BERKELEY.EDU> Received: from UCB-VAX.BERKELEY.EDU by MIT-XX.ARPA with TCP; Tue 13 Aug 85 21:13:47-EDT Received: by UCB-VAX.BERKELEY.EDU (5.5/1.2) id AA22760; Tue, 13 Aug 85 18:11:24 PDT From: dual!mordor!seismo!munnari!basser.oz!john@UCB-VAX.BERKELEY.EDU Received: by dual.UUCP id AA07127; Tue, 13 Aug 85 08:08:52 pdt Received: by s1-c.ARPA id AA08151; Mon, 12 Aug 85 11:07:47 pdt id AA08151; Mon, 12 Aug 85 11:07:47 pdt Received: from munnari.UUCP by seismo.CSS.GOV with UUCP; Sun, 11 Aug 85 08:41:56 EDT Message-Id: <8508111241.AA27533@seismo.CSS.GOV> Date: Sun, 11 Aug 85 20:55:58 EST Received: from basser (via basser) by munnari with SunIII (4.44) id AA20310; Sun, 11 Aug 85 21:03:39 EST To: munnari!telecom Subject: Re: CCITT modems In article <9804@ucbvax.ARPA> decwrl!sun!calma!helge@Berkeley (Helge Skrivervik) writes: > Dialing from the US to Austrailia aslo usually works fine, but I have > no information as to what standards they are using down under... We use CCITT (European) standards. I agree with Helge's statements about 212A/V.22 compatibility. John Mackin, Basser Department of Computer Science, University of Sydney, Sydney, Australia UUCP: ...!seismo!munnari!basser.oz!john ARPA: munnari!basser.oz!john@SEISMO.CSS.GOV 14-Aug-85 18:36:25-EDT,766;000000000001 Return-Path: <gutfreund%umass-cs.csnet@csnet-relay.arpa> Received: from csnet-relay by MIT-XX.ARPA with TCP; Wed 14 Aug 85 18:36:22-EDT Received: from umass-cs by csnet-relay.csnet id b000620; 14 Aug 85 18:17 EDT Date: Wed, 14 Aug 85 10:27 EST From: "Steven H. Gutfreund" <gutfreund%umass-cs.csnet@csnet-relay.arpa> To: info-ibmpc@usc-isib.ARPA, telecom@mit-xx.ARPA Subject: 19.2K baud modem An intesting ad in this week's Electronics: 12-Aug Adcomm 96/48 19.2Kbaud Modem Full duplex, Asynchronous, full error checking, $1,995. Carterfone Communications Corp. (214)630-9700 Dallas, TX. (I advise you to check this one out yourselves -- I have no connection with, them, and I am not endorsing the product nor the company). 13-Aug-85 22:17:13-EDT,1477;000000000001 Return-Path: <sun!l5!gnu@UCB-VAX.BERKELEY.EDU> Received: from UCB-VAX.BERKELEY.EDU by MIT-XX.ARPA with TCP; Tue 13 Aug 85 22:17:05-EDT Received: by UCB-VAX.BERKELEY.EDU (5.5/1.2) id AA24397; Tue, 13 Aug 85 19:14:49 PDT Received: from snail.sun.uucp by sun.uucp (3.0DEV4/SMI-2.0) id AA23569; Tue, 13 Aug 85 14:48:30 PDT Received: from l5.sun.uucp by snail.sun.uucp (3.0DEV4/SMI-3.0DEV4) id AA08686; Tue, 13 Aug 85 14:49:01 PDT Return-Path: <gnu@l5> Received: by l5.sun.uucp (3.0DEV2/SMI-3.0DEV1) id AA17768; Tue, 13 Aug 85 14:49:28 PDT Date: Tue, 13 Aug 85 14:49:28 PDT From: sun!l5!gnu@UCB-VAX.BERKELEY.EDU (John Gilmore) Message-Id: <8508132149.AA17768@l5.sun.uucp> To: Telecom-Request@MIT-XX.ARPA Subject: Re: Baud rate limit on voice grade lines I believe the loophole in using the Shannon formula is that it assumes the 3+kHz bandwidth that is guaranteed throughout the phone network. The way local phone companies are offerring higher speed digital access is by using the higher bandwidth available *in the local loop*. The digital data is not passed thru the entire network as [possibly digitally encoded] voice-grade analog signals, but is recognized as digital data at the CO and transmitted digitally. I believe this is also how the "data under voice" systems work -- the data is going in a portion of the local loop's bandwidth that the normal phones filter out and refuse to use. This is speculation; any authoritative comments? End of TELECOM Digest *********************