[PLUG] cross connecting telephone

[Stafford A. Rau]

* Russell Senior <seniorr at aracnet.com> [040825 15:52]:
> >>>>> "Paul" == Paul Johnson <baloo at ursine.ca> writes:
> 
> Paul> 10MB ethernet doesn't use all pairs, but 100MB does.
> 
> You want to cite your source on that one?

Here's what the Cisco CCNP BCMSN book says about it:

Because UTP Ethernet connections use only pairs 1,2 and 3,6, some cable
plant installers connect only these pairs and leave the remaining two
positions empty. Although this move provides Ethernet connectivity, it
is not good practise for future needs.<snip> Also, to be compatible with
the new IEEE 802.3ab standard for Gigabit Ethernet over copper
(1000BASE-T), all four pairs must be used end-to-end.

So, yes and no.

--Stafford