http://wiki.freifunk-hannover.de/Fonera_mit_OLSR

From the power connector.
Pin 1, Pin 2, Pin 3, Pin 4
GND, Tx, Rx, VCC
Red, Black, White, No Connection.

from:
http://www.flickr.com/photos/playerx/734230657/in/photostream/

Hier: Conrad 762278
SW: Masse
BL: RX
WS: TX

Masse WS BL

|----_____________
|    |    |      >
|____-------------

Masse TX RX from:

http://www.heise.de/mobil/artikel/Datenkabel-selbst-bauen-222729.html

http://kamikaze.openwrt.org/8.09/atheros/