Crossover T1 vs Cat5

As I am getting together a CCNP lab, I came to find there is a difference between a T1 crossover and a Cat5 crossover. A T1 crossover switches pins 1,2,4,5 while Cat5 switches 1,2,3,6. For those of you used to making Cat5 crossovers, instead of swapping the "straddling" pair, swap the "straddled" pair.

I'll have to make myself a new cable or 2.

Network world has recently blogged about the best Routers and Switches for CCNP labs if anyone else is building a home lab.

Best Router for CCNP Prep in 2010 and Best Switch for CCNP Prep in 2010 and finally the full lab setup What to Buy?


Cat5 Cross over Cable

End 1
Pin – Description
1 – Green White
2 – Green
3 – Orange White
4 – Blue
5 – Blue White
6 – Orange
7 – White Brown
8 – Brown
End 2
Pin – Description
1 – Orange White
2 – Orange
3 – Green White
4 – Blue
5 – Blue White
6 – Green
7 – Brown White
8 – Brown


T1 Cross over Cable

End 1
Pin – Description
1 – Green White
2 – Green
3 – Orange White
4 – Blue
5 – Blue White
6 – Orange
7 – White Brown
8 – Brown
End 2
Pin – Description
1 – Blue
2 – Blue White
3 – Orange White
4 – Green White
5 – Green
6 – Orange
7 – Brown White
8 – Brown

*Note that this also means you lose your solid-stripe-solid-stripe pattern on one end.