Andrew Kohlsmith wrote:
On Monday 24 April 2006 16:13, Rich Adamson wrote:
A 'real' T1 cable would use a twisted pair for pins 1 & 2 and another
twisted pair for 4 & 5. Looks like a typical cat5 straight-through
cable uses twisted pairs straight across pins 1 through 8.
Nope. A cable wired for ethernet and a cable wired for T1 are wired
*identically*:
Pair 1: Pins 4&5
Pair 2: Pins 1&2
Pair 3: Pins 3&6
Pair 4: Pins 7&8
Where the difference lies in what pairs are used. T1 uses pairs 1 and 2,
while standard 10/100 ethernet uses pairs 2 and 3. This is why a T1
crossover and an ethernet crossover are not the same cable, but a T1 patch
and ethernet patch are.
Cool!
Guess you can tell how many times I've actually wired a cat5 cable. ;)
The only issues open relative to using cat5 cables for T1 runs is the
impedance and shielding. Guess we pretty much beat those into the ground
as well.
R.
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