SpitFire Help Desk

Pinout View Facing Cable End

    12 34 5678 Cable End A
    45 31 2678 Cable End B       

So in this diagram we can see that Pin 1 is connecting to Pin 4 and Pin 2 is connecting to Pin 5.
To make a T1 crossover cable you will need an RJ45 crimping tool and at least one RJ45 end. 

Although shielded T1 cable is the ideal, you will find that using a Category 5  (CAT5) patch cable will work just fine with out any issues. The data pins are 1, 2, 4, and 5.   The third pin is ground which is frequently unused.
Pins 6,7 & 8 are unused.