Circuit for interfacing remote functional units to a terminal

Details Circuit for interfacing remote functional units to a terminal Circuit for interfacing remote functional units to a terminal

1984-12-07

1986-01-21

Orsino, Jr., Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

372 38, 455612, 455613, 455618, H04B 900

Patent

active

045661340

ABSTRACT:
In a highly modular terminal, pluggable functional units communicate optically through a closed chamber. Some functional units are logically integrated into the terminal structure while being physically remote. In a supermarket system, bar code scanners and produce scales are examples of physically remote functional units. A circuit for interfacing the remote units to the closed chamber uses a broadcast/concentrator mode of operation. A single optical detector broadcasts the extant chamber signals to all of the remote functional units. Signals from the remote units are logically ORed or concentrated to provide a drive signal for a single optical emitter capable of injecting optical energy into the chamber.

REFERENCES:
patent: 4107518 (1978-08-01), McMalton
patent: 4234970 (1980-11-01), Beasley et al.
patent: 4281253 (1981-07-01), Culver
patent: 4393515 (1983-07-01), de Neumann
patent: 4408353 (1983-10-01), Bowen et al.
patent: 4446550 (1984-05-01), Brajder et al.
Gfeller et al.--"Local Area Fiber-Optic"--IBM Tech. Discl. Bulletin, vol. 22, #8B, Jan. 1980, pp. 3815, 3816.

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