&M Wink-Start Signaling

&M Wink-Start Signaling

Tie trunks have bidirectional supervisory signaling that allows either end to initiate a trunk seizure. In this way, one PBX seizes the trunk, which then waits for an acknowledgment reply from the remote end. The local end must differentiate between a return acknowledgment and a remote-end request for service. Wink-start signaling, shown in Figure 2-17, is the most common E&M trunk seizure signal type.