telecom@ucbvax.ARPA (10/29/84)
From: Jon Solomon (the Moderator) <Telecom-Request@BBNCCA> TELECOM Digest Mon, 29 Oct 84 13:21:38 EST Volume 4 : Issue 110 Today's Topics: RJ41 and RJ45 Multiple carriers FROM the UK to the US MIT Communications Forum ---------------------------------------------------------------------- Date: Fri 26 Oct 84 02:10:59-PDT From: David Roode <ROODE@SRI-NIC.ARPA> Subject: RJ41 and RJ45 To: Telecom@BBNCCA.ARPA Location: EJ286 Phone: (415) 859-2774 These two data-connect options differ. One provides information to the modem to let it adjust its performance to suit the previously determined characteristics of the loop to the central office. The other is a combination of a line with a guaranteed minimum signal level and a resistor in circuit with the line to reduce the signal level to a guaranteed maximum level. Does anyone know which of RJ41 and RJ45 fits which of these two descriptions, and can anyone shed any additional light or offer corrections? ------- ------------------------------ Date: 26-Oct-1984 1226 From: covert%castor.DEC@decwrl.ARPA (John Covert) To: telecom@bbncca.ARPA Subject: Multiple carriers FROM the UK to the US I just received the following from Jeremy Barker in the U.K. BT now has agreements with MCI International and GTE Sprint to operate international service between the US and the UK. This is all well and good, now MCI and Sprint customers in the US will be able to make cheaper calls to the UK than AT&T currently provides. There is however a VERY SERIOUS CATCH. Calls from the UK to the US will be RANDOMLY ROUTED by any one of the three carriers. BT customers will not be able to select which carrier is (or is not) to be used. Knowing the kinds of problems with fade and noise on the current lines, and the poor (randomly cut, etc.) connections provided by MCI and the like in the US I forsee a substantially higher percentage of failed and inaudible calls. (Even though BT goes to great length to say that all that will change will an increase in the number of transatlantic circuits and that this will result in fewer failed calls due to network congestion). I should point out that Telex has been this way for years, since there have "always" been multiple Telex carriers. Telex traffic to the U.S. can be routed either by translation of the first several digits of the Telex number, or as is most commonly done, by weighting the random selection algorithm to correspond to the same percentages as the incoming traffic indicates. ------------------------------ Date: Mon, 29 Oct 84 06:34 EST From: Kahin@MIT-MULTICS.ARPA Subject: MIT Communications Forum To: Telecom@USC-ECLC.ARPA, Human-Nets@RUTGERS.ARPA, *bboard@MIT-MC.ARPA, Kahin@MIT-MULTICS.ARPA MIT COMMUNICATIONS FORUM: November 29, 1984 4-6 p.m. Room 37-252 "As satellite communications becomes increasingly effective and commonplace, the United States Information Agency has moved boldly to use the technology in its public diplomacy program. It has already established its own private television network and has recently funded a major feasibility study of direct satellite broadcasting for the Voice of America. "Although international shortwave radio broadcasting is an accepted medium of public diplomacy, satellite broadcasting and television are as controversial as they are powerful. What are the long-range opportunities for using satellites and television? How will they affect or be affected by international attitudes towards information and communication? What will be the effect on Intelsat and on the allocation of the orbital arc? How will it change the domestic presence of the USIA, including the prohibition against domestic distribution of Agency productions? Dan Mica, Chairman, House Subcommittee on International Operations; Michael Schneider, USIA; Hewson Ryan, Director, Murrow Center for Public Diplomacy, The Fletcher School ------------------------------ End of TELECOM Digest ******************************