CAN (Controlled Area Network) bus was implemented in some vehicles in the late '80's, and was used on pre-2005 (2004 MY for UK owners) Mk-III Rovers. The 2005 MY (what UK owners call 2004 MY) was the MOST fiber optic system.
Here are some links for CAN info...
http://www.interfacebus.com/Design_Connector_CAN.html
http://www.canbus.us/
Here are some links for CAN info...
http://www.interfacebus.com/Design_Connector_CAN.html
http://www.canbus.us/