Received: by bu-cs.BU.EDU (5.58/4.7) id AA25329; Sat, 3 Dec 88 15:43:37 EST Message-Id: <8812032043.AA25329@bu-cs.BU.EDU> Date: Sat, 3 Dec 88 15:30:13 EST From: The Moderator Reply-To: TELECOM@bu-cs.BU.EDU Subject: TELECOM Digest V8 #193 To: TELECOM@bu-cs.bu.edu TELECOM Digest Sat, 3 Dec 88 15:30:13 EST Volume 8 : Issue 193 Today's Topics: Re: Need a device to prevent outgoing toll calls Reason for Cellular roamer ports going off hook before call complete Re: Switched 56kbps services Re: Laser Beam as a ethernet backbone Re: Octothorpe source ---------------------------------------------------------------------- To: reed!tektronix!comp-dcom-telecom From: apple.i.intel.com!marko (Mark O'Shea) Subject: Re: Need a device to prevent outgoing toll calls Date: 30 Nov 88 20:22:26 GMT Organization: Intel Corp., OMSO UNIX Development, Hillsboro, OR Lines: 16 I had a similar phone problem. My local phone company set it up so that no toll calls could be made from my phone or to my phone. When I wanted to call long distance I used my credit card. I worked just like a pay phone. The operator would come on and ask for my billing. It cost me about $20 (one time) for the service. It cost about the same to have it removed once I no longer needed it. I live in a small rural community with a local phone company, but we use AT&T operators. For those of you who say "...why doesn't she control her kid...". Save your posting and read it again after you have raised two or three teenagers. Mark O'Shea SDA ------------------------------ Date: Thu, 1 Dec 88 22:53:10 EST From: ghg@en.ecn.purdue.edu (George Goble) To: telecom@bu-cs.bu.edu Subject: Reason for Cellular roamer ports going off hook before call complete In article , I wrote: >A couple of years ago, the roamer ports used to not go off hook until >the cell phone answered, but the operating companies (not the cell companies) >bitched so much, that they were changed into going off hook before >entering the roamer number. I have recently talked to 3 cellular salesman, I just got off the phone with John Covert. He had information which said that ATT (when they went to #4 ESS toll switches) was the cause of the roamer ports going off hook. The #4 ESS only allows a one-way connection until the remote end goes off hook. This was designed to stop "black boxing" toll fraud and misinstalled PBX's which did not always go off hook on DID trunks. It also messed up intercept operators. I will certainly pass this tidbit on to my sources in GTE. --ghg ------------------------------ To: bu-cs.bu.edu!telecom@cs.utexas.edu From: harvard!cs.utexas.edu!vector!chip (Chip Rosenthal) Subject: Re: Switched 56kbps services Date: 2 Dec 88 01:04:57 GMT Brian Jay Gould (gould@pilot.njin.net) writes in issue 189: > I'm trying to get some information on switched 56kbps services [...] > 1) How do they initiate a call? via keypad? AT command set? [...] > I suspect that in most (all?) cases a dedicated link is required > 2) What kind of link is it? 56kbps digital? 64kbps digital? T1 required? Basically the "Switched-56" service is just like a 56Kbps DDS leased line, except (1) you are charged by connect time rather than a fixed fee, and (2) it isn't an end-to-end line. For example, if you have lines into your Main Street, Elm Street, and Oak Avenue offices and you connect up from one office to either of the other two. So, you end up with a 56Kbps dedicated digital line in your facility. The "dialing" commands are but one of the network control codes which need to be transmitted over the line. I believe that the DTE must generate the dialing commands, unless there are intelligent DSU's which do this. Below is information from AT&T's 3/13/87 FCC tariff for Switched-56: 56kbps Switched Digital Service is furnished for the switching and transmission of simultaneous two-way 56 kbps digital signals. It consists of a common user digital network which is furnished between designated AT&T Central Offices. Service is available for use 24 hours a day, seven days a week. A call can access the 56 kbps Switched Digital Service network at designated AT&T Central Offices via an access line. Access lines are provided. Access lines are connected at the AT&T Central Office for switching to: - another access line for communications between two Customer's premises served by the same AT&T Central Office, or - the common user digital network for communications between two Customer's premises served by different AT&T Central Offices. Customer equipment is required to terminate a 56 kbps Switched Digital Service call. Technical Publication - PUB 41458 sets forth the network specifications of this equipment. __Mileage_Rates__ Airline Initial Period Each Add'l Period Mileage (30 sec) (6 sec) 0 $0.35 $0.06 1-100 $0.36 $0.06 101-500 $0.38 $0.07 501-1000 $0.43 $0.08 1001-up $0.47 $0.08 Possible documents of interest: AT&T TR41458 - Special Access Connections to the AT&T Communications Network for New Service Applications, October 1985, $60.00 AT&T TR41458A2 - Addendum to TR41458, February 1987, no charge Bellcore TR-880-22135-84-01 - Circuit Switched Digital Capability Network Interface Specifications, Issue 1, July 1984, $48.50 -- Chip Rosenthal chip@vector.UUCP | Choke me in the shallow water Dallas Semiconductor 214-450-5337 | before I get too deep. ------------------------------ To: comp-dcom-telecom@killer From: doug@merch.TANDY.COM (Doug Davis) Subject: Re: Laser Beam as a ethernet backbone Date: 2 Dec 88 03:04:10 GMT Sorry the FCC has absolutly *NOTHING* to do with lasers, All forms of laser and coherent radient emitting devices are controled by the Food and Drug administration. Lasers are specifically covered in CFR-21 parts 1000.00 - 1040.30, stat 44 FR 52195 1979, and sec 358, stat 82 1177-1179 (42 U.S.C. 263F) Incidently these same areas cover all federal regulations on *LIGHT* emitting produces, such as the afformention automotive headlights.. Almost anyone who commercially deals in a wide varity of lasers should be able to provide you with copies of the relivent sections. doug davis -- LaserOptic 1030 Pleasent Valley Lane Arlington Texas 76015 (817)-467-3740 { motown!sys1, uiucuxc!sys1, texbell}!doug ------------------------------ To: comp-dcom-telecom@watmath.waterloo.edu From: Ken Dykes Subject: Re: Octothorpe source Date: 1 Dec 88 05:16:27 GMT > All my Bell System references call # The Number Sign (or Pound). >The only times I see it called an Octothrope is in Northern Telecom Inc >publications talking about Digipulse Dialing, "their name" for DTMF. N.Tel calls DTMF either DTMF or "Touch Tone (tm)" "Digipulse" is the push-button like phones which generate the *pulses* that a dial would normally generate. ie: digitally generated pulses (instead of mechanical/rotary generated) Since N.Tel makes phones that do this, they needed a marketing name. Those free give-away phones from magazine subscriptions generally do this. ----- I guess with Free Trade, ATT is going to have to call them octothorpes now :-) -- - Ken Dykes, Software Development Group, U.of.Waterloo Waterloo, Ontario, Canada N2L 3G1 kgdykes@watmath.uucp kgdykes@water.bitnet kgdykes@waterloo.csnet kgdykes@watmath.uwaterloo.ca kgdykes@watmath.edu {backbone}!watmath!kgdykes ------------------------------ End of TELECOM Digest *********************