Apparatus for providing multiple controller interfaces to a stan

Details Apparatus for providing multiple controller interfaces to a stan Apparatus for providing multiple controller interfaces to a stan

1989-06-09

1991-02-12

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

455 88, 340825500, H04J 304, H04B 138

Patent

active

049930230

ABSTRACT:
A communication system which includes a modem and a plurality of controllers has each controller connected to the modem by an interface apparatus, each controller and the modem complying with a predetermined protocol. The interface apparatus comprises a bus which provides a medium to transfer signals between the controllers and the modem. A first interface unit, which interfaces the modem to the bus, implements, a modem-associated multi-state state machine and responds to signals on the bus maintaining the predetermined protocol between the modem and the first interface unit. A plurality of second interface units interface a corresponding controller to the bus. Each second interface unit implements a controller-associated multi-state state machine which responds to signals on the bus and further responds to signals from the corresponding controller, each second interface unit maintaining the predetermined protocol between the second interface unit and the corresponding controller. A contention resolution mechanism is multiplexed onto the same bus to resolve contention among the several controllers for access to the single modem.

REFERENCES:
patent: 4608700 (1986-08-01), Kirtley, Jr. et al.

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