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BriCrossCable

When using a BRI ISDN card in NT mode (Network Termination), a crossed cable must be used.

This cable also needs (depending on the cards port) 100Ohm resistor termination.

 Side A Side B
 1 1
 2 2
 3 4
 4 3
 5 6
 6 5
 7 7
 8 8

3/4 and 5/6 are the crossed lines.

For the termination, you need to place a 100 Ohm resistor
  * between 3 and 6
and one
  * between 4 and 5
on both sides.
(It seems to work with termination on one side only too when the cable is short)