(under subclass 225) Subject matter wherein the communication system has at least one retransmission station wherein an alternate communication channel is provided to convey information when a primary channel or link is failed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
242, for fault detection of a repeater system.
246+, for testing of a standard operation of a repeater.
274, for a quadruplex repeater.
279, and 293, for a duplex repeater.
315+, for a repeater in communication over free space. 492, for repeating information via a frequency channel.
501+, for repeating information via a time channel.
SEE OR SEARCH CLASS
379, Telephonic Communications,
4, for nonmultiplex telephone alternate routing around a faulty repeater.
