Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!sun-barr!texsun!texbell!vector!telecom-gateway From: westmark!dave@rutgers.edu (Dave Levenson) Newsgroups: comp.dcom.telecom Subject: Re: Jack specifications Message-ID: Date: 17 May 89 17:56:08 GMT Sender: news@vector.Dallas.TX.US Organization: Westmark, Inc., Warren, NJ, USA Lines: 29 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us X-TELECOM-Digest: volume 9, issue 168, message 6 of 8 In article , ucla-an!denwa!bongo! julian@seas.ucla.edu (julian macassey) writes: > OK, let's start with the RJ-21X, because it is not "one of those > rectangular connectors"... > An RJ21X is a 66 block that is used as the "Demarcation Point". Actually, the code RJ-21X refers to the "Amphonol" 50-pin miniature ribbon connector, and not to the "66-block" with which it is often associated. In a "by the rules" RJ-21X installation, the customer equipment is required to be attached by an "Amphonol" which mates with one supplied by the telco. In the real world, the RJ-21X provided by most telcos is connected to a 66-block which contains the demarcation straps described in Julian's posting, and is then connected the service-entrance cables at the station-protector. A lot of premises equiment installers will punch down wire pairs on the telco 66-block, and ignore the "Amphonol" provided. I have one customer, however, where the 66-block is under lock and key, and the RJ-21X is the only connector accessible to the customer. (The installers promptly installed their own 66-block and cabled it with an "Amphenol" to the '21X!) -- Dave Levenson {uunet | rutgers | att}!westmark!dave ...the man in the mooney