AT&T 518-600-016 manual Theory of Operation

Direction A tie line may be administered in one of the three following ways:

●Two-way (default): Calls may be made in either direction.

●Outgoing only: Calls may be made but not received.

●Incoming only: Calls may be received but not made.

Type There are four types of tie line options.

●Wink start (default): The originating end of the tie line transmits an off-hook signal and waits for the remote end to send a signal indicating that it is ready (a wink). This is also know as a dial repeating tie line.

●Automatic start: Incoming calls are routed directly to an attendant station without a start signal. This is also known as an automatic ringdown tie line.

●Immediate start: No start dial signal is necessary. Dialing may begin immediately following seizure of a line. This is also known as a dial repeating tie line.

●Delay dial start: The originating end of the tie line transmits an off-hook signal and waits for the remote end to send a delay dial signal (an off- hook signal followed by an on-hook signal). This is also known as a dial repeating tie line.

Signaling Mode Signaling mode designates the electrical interface used.

●E&M mode: The signaling leads are isolated from the transmission leads. The E&M mode can be either protected or unprotected.

WARNING: The protected mode must be used whenever the E&M leads extend out-of-building and are not connected to the network interface.

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