How to E1 / T1 Crossover Cable

The berofix has always a TE Pinout with Pins 1 RX-,2 RX+,4 TX- and 5 TX+ regardless if berofix is configured as TE or NT. If you want to connect a TE berofix Port with a NT equipment, you can normaly use a standard straight cable, when the NT equipment uses 1 the following default NT pinout:

berofix TE to Equipment NT

1 RX-    -     1 TX- 

2 RX+    -     2 TX+ 

4 TX-    -     4 RX- 

5 TX+    -     5 RX+ 

But if you want to connect a berofix NT port to Equipment TE (or even a berofix TE), you will need to have a crosscable. See the following shema and picture.

berofix NT to Equipment TE

1 RX-   \   /   1 RX- 

2 RX+    \ /    2 RX+ 

4 TX-    / \    4 TX- 

5 TX+   /   \   5 TX+ 

As you can see, this will not work with a straight cable. You will need to have a crosscable. See next picture.

berofix NT - PBX crossover cable

1 RX-     -   4 TX- 

2 RX+     -   5 TX+ 

4 TX-     -   1 RX- 

5 TX+     -   2 RX+