Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!texbell!vector!telecom-gateway From: john@zygot.ati.com (John Higdon) Newsgroups: comp.dcom.telecom Subject: Re: Some Comments On The GTE "Problem" in California Message-ID:Date: 23 Sep 89 04:53:54 GMT Sender: news@vector.Dallas.TX.US Organization: Green Hills and Cows Lines: 42 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 399, message 8 of 9 In article , zorch.SF-Bay.ORG!scott@ cs.utexas.edu (Scott Hazen Mueller) writes: > I'm not picking on John, really I'm not; his was just a good example. I > read the the words, but I'm seriously lacking some referents. For instance, > "subscriber carrier"? When the phone company runs out of pairs and there are more lines that need to be installed, subscriber carrier allows two subscribers to use one physical pair of wires. At the CO (or wherever it is necessary to channel two services into one pair) a carrier unit is installed and a matching unit at the "carrier" customer's location. The unit superimposes 30-60 KHz carriers on the line which carries the voice and supervisory signals. The "metallic" customer is the one using the line in the conventional manner with a conventional instrument, while the "carrier" customer has his service out of a "subscriber carrier" unit. > The description implies a generator on > John's premises, which was powered from the phone system, and which he > added a power supply to when GTE switched it off. Yes, the unit is on the premises. It has a nicad which trickle charges off the DC on the phone line when the line is not in use by either party. The ring current, talk battery, and carrier encoding/decoding are all powered by that nicad. If the phone is used a lot, or for some reason that DC is not present, eventually the carrier subscriber's phone may not ring or even pull dial tone. Fortunately, there is a place inside the unit where one can hook up a 15V transformer and the unit then becomes independent of the DC on the line. > Also, his line was "converted to metallic"? Eventually, they had enough cable pairs in the area (by installing new cable) to give me one all to myself. > What was it before it was metallic - a piece of string with two tin cans? No. That probably would have worked better. John Higdon | P. O. Box 7648 | +1 408 723 1395 john@zygot.ati.com | San Jose, CA 95150 | M o o !