| 摘要 |
<p>F.93 ONE-FOR-N MODEM CONTROL APPARATUS Communications apparatus includes one-for-n modem redundancy for a plurality of typically contiguously disposed modem modules. The modem modules comprise ? 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 ? on-line unit.</p> |
