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We just finshed up a combines voice/data install at one of our major client locations and a telus tech showed me via his trace set there was signal cross three jacks.
I did not terminate the data center bix wafers for voice so know it was not of my doing but want to know if the wires that were terminated properly on the bix wafers would a service loop cause the cross talk?
I have always put some kind of service loop often because it is stated in the specs for the station end. In this case we had an ass of a employee not pull in the last 10 feet of cable into the NOC for perhaps 10 wires and left in a service loop form in the riser closet. Would this cause cross talk? This is UTP white belden cable.
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Joined: Feb 2005
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My first guess would be split pairs someplace.
-Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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Put a cable tester on those outlets indicated...it will show which pairs are good or bad.
Ken
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Joined: Mar 2002
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Moderator-Avaya, Nortel
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Moderator-Avaya, Nortel
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service loops generally don't cause cross talk. Like Hal said, sounds like some crossed pairs or bad pairs.
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Joined: Jun 2006
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Moderator-Nortel, Computers, General
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Moderator-Nortel, Computers, General
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You say that they are terminated on BIX blocks :dance:  . Make sure that they are on BIX1A or BIX1A4 blocks, not 2A, 5A or 7A blocks. These are bridging blocks. Definately sounds like split pairs though.
Scientists say that the universe is made up of Protons, Neutron & Electrons. They forgot "Morons".
Dave. (CTUB) Canadian Techs Use Bix!
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A Telus tech that has test gear. All the guys in this area only have toners and probes. But you need a tester and test it yourself.
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Joined: Aug 2005
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Specifically something more than a simple pair tester. Wayne is referring to a Fluke analyzer, Pentascanner, something that will give a wire map and then test all pair combinations.
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Joined: Jun 2005
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Yah, I wouldn't trust a trace set to tell you if you have crossed pairs, put a fluke on there and you will find the answer. Service loops could cause cross talk, because they are inductance loops.
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Moderator-Vertical, Vodavi, 1A2, Outside Wire
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Moderator-Vertical, Vodavi, 1A2, Outside Wire
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It must be split pairs. My guess would be that the jacks in question are wired "USOC", which effectively splits all of the pairs up for the most part. Nobody uses that standard anymore, but many jack manufacturers include the diagrams in their packaging. Maybe someone was asleep at the wheel.
Ed Vaughn, MBSWWYPBX
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Any kind of electromagnetic interference (EMI) could cause this. It can be either inductive or capacitive.
Woody Asher
Datacom Cable, LLC
Manchester, KY
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