AT&T MERLIN LEGEND System Reference Manual page 493

Functional Description
4-24 Lines/trunks
The following tie-trunk options need to be programmed via system
programming:
E&M Signaling Type
Type 1 standard (the factory setting) — used when tie trunks are
connected to the other system through the local telephone company.
Type 1 compatible — used when tie trunks are connected directly to a
system that uses type IS signaling and is located near this system.
Type 5 — used when tie trunks are connected directly to a system that
uses type 5 signaling and is located near this system.
Direction
Two-way (factory setting) — Calls can be made in either direction.
Outgoing only — Calls can be dialed but not received (no ringing).
Incoming only — Calls can be received but not dialed (no dialing).
Dial Mode
Rotary (factory setting)
Touch-tone
Note: If the 400EM module is programmed for touch-tone dialing and there
are no modules in the system that provide TTR
400 GS/LS/TTR or 800 DID), a 400 GS/LS/TTR module must be installed.
Dial Tone determines whether the dial tone originates from the remote or
local end of the line:
Remote (factory setting) — The system sends a dial tone to the remote
end.
Local — The system does not send a dial tone to the remote end.
Answer Supervision Time sets a time limit in milliseconds (ms) for the
remote station to signal the calling station:
300 ms (factory setting)
20 to 4800 ms (increments of 20 ms)
Disconnect Time sets a time limit in ms for the release of the E or M lead:
300 ms (factory setting)
140 to 2400 ms (increments of 10 ms)
Signaling Types (also called "seizure type")
Wink (factory setting) — The originating end of the tie trunk transmits an
off-hook signal and waits for the remote end to send back a signal (a
wink) indicating that it is ready to receive dialing information.
Immediate — No start signal is necessary, and dialing can begin
immediately after the tie trunk is seized.
(012, 008 OPT, 400 LS/TTR,
S