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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here
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To: Tom Eames who wrote (287)10/3/1996 1:24:00 AM
From: Ray Jensen   of 12823
 
Tom, interesting comments on loop conditions comparing ISDN, xDSL, etc. Some telcos are swamped with deloading pairs for ISDN and are already hacking up the feeder pairs like crazy to accomplish this. However, your suggestion that it may be necessary in some cases to re-splice some existing copper pairs or cut bridged tap to accomodate xDSL/ADSL is about appealing as fixing a cracked lead sleeve on a 3600 pair pulp cable at the bottom of a flooded manhole with a dead air compressor at the central office. Those of us who know beans from pick-a-bonds, and scotchlocks from 710A modular splices know that re-splicing working copper pairs or fixing shiners in a lousy splice is the absolute last thing any sane telco splicer would want to do. I have seen splicers cause more trouble reports than they fix in trying to "clean up splices". In most cases, no one dares go back into those splice cases, and then they have to use up more valuable spare pairs. This is why DAMLs are being installed like gangbusters for POTS growth. If telcos find out that they have to spend a lot of money to re-build splices and cut out bridged tap to make xDSL work, they will probably not be very happy. This might lend credence to what the folks at Pairgain say, that is, symmetrical 780 kbps on one pair using HDSL might be a good way to transport fairly high speed data to residential customers using a technology that at least is proven on tens of thousands of real world copper loops, not just on laboratory copper pairs. That sure beats playing around in working copper splices. Most telcos would rather invest money in a fully functional broadband infrastructure than sink more money into playing around in old copper pairs. regards, Ray J.
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