A.1 Null Modem Cable

For using the otional package PPP a null modem cable is needed.

It needs at least three wires. This is the pin layout:

male-  female-                        female-  male-
     pins                                pins
25pin     9pin                        9pin     25pin

    8  +- 1                             1  -+   8
       |                                    |
    3  |  2 ------------\ /------------ 2   |   3
       |                 X                  |
    2  |  3 ------------/ \------------ 3   |   2
       |                                    |
   20  +- 4                             4  -+  20
       |                                    |
    7  |  5 --------------------------- 5   |   7
       |                                    |
    6  +- 6                             6  -+   6

    4  +- 7                             7  -+   4
       |                                    |
    5  +- 8                             8  -+   5

The plugs have to be soldered with the bridges shown above.