NNSquad - Network Neutrality Squad
[ NNSquad ] Why Gigabit DSL matters
Several NNSquad readers reacted to a posting of mine yesterday (regarding a Gigabit short range DSL tech), suggesting that existing Ethernet standards provide the same functionality. I believe this DSL technology is of most interest where utilities are trying to leverage existing copper cable plant, especially in underground utility situations (which often can mean 50+ year old cables in hard to access locations buried directly in the ground). I would expect any successful high speed DSL system to generally have better noise immunity and crosstalk rejection characteristics than conventional Ethernet -- especially important in old, tightly packed cables that can have 500+ pairs. But the big advantage in these situations is only needing one pair, vs. two or four for 100bT or 1000bT Ethernet. Fewer pairs means fewer interfaces and nominally less expensive equipment, but the big win relates to the fact that many of these hard to replace cables are so old and so badly maintained (and/or in poorly documented bridging configurations) that many/most of the pairs won't even test out suitably for data. Only needing to find one good pair for a customer is a win in these kinds of situations. So I think there is a quite valid place for this tech. --Lauren-- NNSquad Moderator _______________________________________________ nnsquad mailing list http://lists.nnsquad.org/mailman/listinfo/nnsquad