UTP wiring

UTP wiring

Post by Timothy S. Weav » Thu, 05 Aug 1993 00:18:31

Could someone please post the wiring pinouts for UTP?  I need to know where
the TXD+/- and RXD+/- go on each end.

UTP wiring

Post by ober.. » Thu, 05 Aug 1993 01:24:53

Quote:>Could someone please post the wiring pinouts for UTP?  I need to know where
>the TXD+/- and RXD+/- go on each end.

10BaseT uses pairs 2 and 3 of the RJ-45 which are:
1 - Uplink+
2 - Uplink-
3 - Downlink+
6 - Downlink-

I did not use the terms TXD and RXD because the cable doesn't have any null
modem character. That is, it is a straight through cable from the hub to the
MAU (or from hub to hub). Uplink is TXD for the MAU and RXD for the hub.

R. Kevin Oberman                        Lawrence Livermore National Laboratory

Disclaimer: Being a know-it-all isn't easy. It's especially tough when you
don't know that much. But I'll keep trying. (Both)


1. UTP Wiring

Hello All!  I've just completed the installation of CAT-5 UTP in my new
townhouse.  The plan is to use the jacks in each room for access to my
LAN and Voice communications.  The question I have now is that I have
noticed there seems to be two standards for wiring the jacks: 568A and
568B.  What's the difference between the two?  And how do the pairs end
up mapping out on the RJ45 connectors?  Any help / suggestions would be
GREATLY appreciated!



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