From: utzoo!decvax!harpo!duke!mcnc!unc!brl-bmd!TELECOM@Usc-Eclb Newsgroups: fa.telecom Title: TELECOM Digest V2 #93 Article-I.D.: brl-bmd.281 Posted: Tue Jul 27 19:47:40 1982 Received: Mon Aug 2 04:54:41 1982 TELECOM AM Digest Wednesday, 28 July 1982 Volume 2 : Issue 93 Today's Topics: Quad Protocol Modem - 2400 Baud! Lack Of Telephones For The Poor - Could Affect Rate Increase In N. Y. Query Reply - What Does NPA/NXX Mean? ---------------------------------------------------------------------- Date: 27 Jul 1982 0446-PDT From: Geoffrey C Mulligan (AFDSC, The Pentagon) at RAND-AI Reply-To: Geoffm at Rand-Ai Subject: Quad protocol modem Now you too can have 2400 bps dial up service. Racal-Vadic has announced their new VA4400 line of modems. The new modem incorporates a 2400-bps, full duplex modem, a VA3400, a Bell 212A and a Bell 103 in one unit. The VA4401 can originate calls to, and answer calls from, all four of these modem types. It is build around the 16-bit Fairchild 9445 microprocessor, which performs the analog signal processing functions for all four modems. It automatically determines if the modem it is communicating with is 2400 bps, 1200 bps or 300 bps and operates at the highest speed. It can be connected to the VA811 autodialer and/or direct connected to phone lines. The VA4401 will sell for around $1945, in single quantities. It will also be available in a 2400 bps version only for $1745. geoff ------------------------------ Date: 27-Jul-82 12:30:28 PDT (Tuesday) From: Newman.es at PARC-MAXC Subject: No telephones for the poor >From today's New York Times digest: NEW YORK - A lack of telephones among the poor was cited by the New York State attorney general, Robert Abrams, in testifying in opposition to a proposed $878 million annual rate increase sought by the New York Telephone Co.. Abrams said there were no telephones in two-thirds of poor households in New York City, 25 percent of all households in the Bronx and 41 percent of homes in Brooklyn's Williamsburg section. ------------------------------ Date: 27 July 1982 1325-PDT (Tuesday) From: lauren at UCLA-Security (Lauren Weinstein) Subject: NPA/NXX NPA stands for Numbering Plan Area -- the official term for area codes. NXX is one of the number group designators which are precisely defined in the "Notes on Direct Distance Dialing" and other similar Bell System technical publications. To be more precise, the standard NPA definition has been: N 0/1 X where X = any number from 0 to 9 and N = any number from 2 to 9 Ultimately, when all NPA's of this form are exhausted, the form will change to: N X X ... using the same N and X definitions as above. Similarly, the longstanding definition of a central office code (prefix) has been: N N X ... but is converting over to: N X X in some areas (such as L.A. and New York, currently). [and soon in Chicago --JSol] Note that eventually we will have BOTH prefixes that "look" like area codes AND area codes that look like prefixes -- so it is obvious why "1+" dialing conventions (and dialing timeouts in some areas) are very important to provide a means for differentiating between the two types of codes. I seem to recall submitting a rather lengthy table of information to TELECOM (on this very subject) at some time in the fairly recent past which included the maximum number of codes in each category, as well as other data. Presumably this material is in the TELECOM archives for any interested parties. --Lauren-- [Thanks also to John R. Covertfor providing a similar explanation of NPANXX. --JSol] ------------------------------ End of TELECOM Digest ********************** -------