Communication between nodes is through coax or twinax

cables that connect the termination units or modules on each

node. Power and I/O expander bus connections follow the

same connector assignments common to most INFI 90 OPEN

modules (P1 for power, P2 for I/O expander bus).

The INIIT12 INFI-NET to INFI-NET Transfer Module supports

bidirectional communication through two RS-232-C ports. Port

one passes system data only. Port two passes system data or

can be used as a diagnostic port. The central INIIT12 module

can use a variety of means to link to the satellite INIIT12 mod

ule such as modems, microwave and transceivers. The INIIT12

module communicates directly with an NIS module through

the I/O expander bus.

The INIIT12 module is a single printed circuit board that occu

pies one slot in the module mounting unit, adjacent to its NIS

module. The circuit board contains the serial communication

circuitry necessary for it to communicate with another INIIT12 module.

Two captive latches on the INIIT12 faceplate secure the module

in the MMU card cage. The faceplate contains eight CPU LEDs,

a red/green status LED, and a stop/reset switch.