Lamar Owen wrote: > The T1's I've had experience with have all been wired RJ48S, which uses pairs > 1-2 and 7-8 of the 8 pin plug (in TIA-568B that would be the orange-white and > brown-white pairs). If your cables are TIA-568A or B they have the correct > pairing. It's only if you have USOC RJ61 or similar that you have to worry, > as that splits the pairs.
RJ48S is indeed the correct designation for T1, but it uses pairs 1-2 and 4-5. 568B pairing would be white-orange and white-blue. 1-2 and 7-8 are the correct pairs for 56K DDS circuits. > One poster mentioned clocking; this I would check. What sort of errors are > you getting from the controller? I have one T1 here terminated in a RSM/VIP2 > in a Cat5509 using a PA-MC-8T1. Some providers have more problems with B8ZS > versus AMI, and I have seen odd problems with HDSL (PairGain) provisioned > T1's that were the fault of the carrier's shelf backplane. Currently, the T1 > that backs up our OC3 is provisioned over fiber with an FMT-6, and that has > been absolutely rock solid using a standard Cat5 cable about 100 feet long. Indeed clocking can be an issue, and it is often difficult to get a straight answer from a carrier as to how any given circuit is clocked. You want exactly one end of the circuit to provide clock. As a rule, short-haul point-to-point circuits are not clocked by the carrier, most others are. -- Jay Hennigan - CCIE #7880 - Network Engineering - [EMAIL PROTECTED] Impulse Internet Service - http://www.impulse.net/ Your local telephone and internet company - 805 884-6323 - WB6RDV _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
