CAT5 Wiring FREE cabling and networking Helpdesk
 Question by GIAO PHAN posted 27 Apr 2005
 CAT5 Wiring
I have the house prewired with Ethernet cabling. I terminated both side of the CAT5 cables using T568B (all 8 wires). I placed the DSL modem and a router at the panel where all the CAT5 cables are routed to. At the wall RJ45 jacks, I got Ethernet signal if the jumper cable is 2-pair straight through but do not get any signal if the jumper cable is 4-pair straight through. The same 4-pair jumper cable work if I connected it directly from the router to a laptop so I know there is not any problem with the 4-pair cable.

Please help explaining.
 Answer by Joseph Golan posted 27 Apr 2005
Dear GIAO,
Sorry but your problem needs more information.

Were the category 5 cables all tested to standards?

For your 2 pair cable, what are the active pins?

Is your 4 pair cable also wire to either the T568A or T568B standard?

Did you make up these cables or are they factory made to cat 5e standards?

It almost sounds like you may have split pairs, it is just as important to keep the pair integrity as the continuety especially when patching into longer length cables.

Repost with this info and we'll try to help again.

Joseph Golan, RCDD

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