Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: telecom@eecs.nwu.edu (Various Writers) Newsgroups: comp.dcom.telecom Subject: Re: Slick 96? Message-ID: <2105@accuvax.nwu.edu> Date: 12 Dec 89 06:00:00 GMT Sender: news@accuvax.nwu.edu Organization: TELECOM Digest Lines: 105 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 9, Issue 569, message 10 of 10 [Moderator's Note: There have been numerous replies to the 'Slick 96' message which appeared a couple days ago. Yesterday I printed three replies, and today, four more are presented in summary form, for the sake of helping to clear the present backlog in the queue. Dave Brightbill presented the original questions/comments. PT] In article <2018@accuvax.nwu.edu> djb@loligo.cc.fsu.edu (Dave Brightbill) writes: >My rural community is served by Centel. A few years ago, we upgraded >our home service from a 4-party line to a private line. Because of a >lack of available pairs, we had to wait for a line. The telco solved >the problem by installing some sort of magic box on a post in our >community. All of our lines have been wired back to it. The >installer called it a "slick-96" box, and from her description, I >would guess that it is some sort of mux. My guess is that the "96" >refers to 9600 baud. So is this a digital mux? Can it do any tricks? ======================= Organization: Leptons and Quarks, Winfield, IL 60190-1412 Date: 11 Dec 89 23:26:10 CST (Mon) From: Randolph J. Herber It is a Subscriber Line Interface Circuit (96 lines). Yes, it is a mux. Yes, it is digital. No, it does not do tricks. It is used to concentrate 96 subscriber circuits to a single metallic line or optical fiber which then runs to the telephone exchange. In your case, it is probably using your original metallic line. Randolph J. Herber, @ home: {att|mcdchg|laidbak|clout|obdient|wheaton}!yclept!rjh, rjh@yclept.chi.il.us ========================== From: Paul Guthrie Reply-To: Paul Guthrie Organization: The League of Crafty Hackers Date: Tue, 12 Dec 89 08:29:27 GMT The SLC in SLC-96 stands for Subscriber Loop Carrier (althout I have also heard the C stand for Concentrator, but I think Carrier is right). The 96 stands not for "9600 baud", but for the 96 lines that are concentrated onto a T-1 type trunk interface, which normally carries 24 channels. The quick will notice a 4:1 ratio on the SLC-96. I don't recall the signalling protocol. Paul Guthrie chinet!nsacray!paul ============================ From: Paul Elliott x225 Date: 12 Dec 89 16:02:18 GMT Organization: Optilink Corporation, Petaluma, CA The box referred to is a "SLC-96 (tm)", which stands for "Subscriber Loop Carrier - 96". This is a four-T1 system. A T1 circuit uses two pairs of special wire, running at a digital rate of 1.544 Mbit/sec. Each T1 circuit carries 24 channels of PCM. 24 channels times four circuits equals 96 channels, hence the "96". The SLC-96 has been in service for many years, and has been widely cloned. It is a convenient size for providing service to remote clusters of subscribers. The SLC-96 can provide some types of data service via different line card plug-ins, however I am not familiar with all the offerings, or the cost and availability of them. Can anyone out there comment on this? Regards, Paul M. Elliott Optilink Corporation (707) 795-9444 {pyramid,pixar,tekbspa}!optilink!elliott "I used to think I was indecisive, but now I'm not so sure." ============================ From: Peter Desnoyers Date: 12 Dec 89 17:19:06 GMT Organization: Apple Computer, Inc. 96 refers to 96 phone lines - 4 DS1s (also known as T1s), which is actually a DS2. (I guess DS2s do exist outside of add-drop multiplexors.) The data rate is 96*64000 bps plus DS1 and DS2 framing overhead, or somewhere around 6.2Mbps. I don't know if you can get DDS (56kb/s) or T1 (1.544Mb/s) lines off of a SLIC, though. I have heard (rumor only) that it is possible - if the switch software can handle it - to provide basic rate service on some SLICs by dedicating 3 lines for D, B1, and B2, plus the appropriate hardware. I would appreciate it if someone could tell me whether there is any truth to this. Peter Desnoyers Apple ATG (408) 974-4469 [Moderator's Note: In each response above, extensive quoting was removed in order to save time in re-reading the same quotes, and to allow more space for replies from readers. PT]