| 摘要 |
A signaling network system including a plurality of receivers distributed in a protected region comprising multiple protected enclosures and including RF receivers as well as a plurality of non-RF receivers, located within said multiple protected enclosures, for receiving non-RF signals emanating from within the enclosure within which the receiver is located, said non-RF signals generally not capable of being received by a receiver located outside the enclosure from which they are transmitted and at least one portable emergency indicating signal transmitter which is selectably locatable in an enclosure and which is operative to transmit, when actuated, both RF and non-RF signals.
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