One-for-n modem control apparatus

Details One-for-n modem control apparatus One-for-n modem control apparatus

1979-01-10

1981-01-13

Atkinson, Charles E.

Excavating

340147SC, 370 16, G06F 1100, H04B 1700

Patent

active

042453429

ABSTRACT:
Communications apparatus includes one-for-n modem redundancy for a plurality of typically contiguously disposed modem modules. The modem modules comprise n active units each illustratively operating in a different frequency band and a redundant (spare) modem of electronically adjustable frequency. The on-line (active) modem modules each include a multiplexer which normally connects user terminal equipment associated with the module to the frequency translating and data and control signal processing circuitry in the module.
When a fault is detected in one of the modems (sensed, for example, by negated module "data valid" or "clear to send" levels for receive and transmit modems, respectively), a hierarchal control network and related apparatus automatically sets the redundant modem to the proper operating frequency and substitutes the spare for the failed unit via the appropriate multiplexer.
In an alternative, microprocessor controlled embodiment of the present invention, the dedicated priority of the hierarchal control network may be replaced by any desired algorithm for alloting the redundant modem among the n on-line unit.

REFERENCES:
patent: 2680162 (1954-06-01), Brehm et al.
patent: 3111624 (1963-11-01), Farkas
patent: 3518549 (1970-06-01), Sarati
patent: 3681694 (1972-08-01), Sarati
patent: 3886318 (1975-05-01), Charransol et al.
patent: 3963988 (1976-06-01), Niethammer
patent: 4039947 (1977-08-01), Miedema
patent: 4119815 (1978-10-01), Frankfort et al.

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