1. The use of signals for controlling communications.
2. In a telecommunications network, the information exchange concerning the establishment and control of a connection and the management of the network, in contrast to user information transfer.
3. The sending of a signal from the transmitting end of a circuit to inform a user at the receiving end that a message is to be sent.
Source: from Federal Standard 1037C and from MIL-STD-188
... Mount Baker-Snoqualmie National Forests[?]
Okanogan National Forest[?]
Olympic National Forest[?]
Wenatchee National Forest [?]
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