AT&T MERLIN LEGEND Release 4.0 Feature Reference page 433

Feature Reference
T1 Programming Options
DS1 facilities programmed as T1 trunks can supply many types of connections.
T1 service transmits and receives voice and analog data, as well as digital data
in Release 4.0 communications systems. The connections can be to the Public
Switched Telephone Network (PSTN), or they can be tie trunks to other MERLIN
LEGEND Communications Systems or other PBX systems.
T1 Switched 56 channels connected to the PSTN can use Routing by Dial Plan
to send incoming calls to the correct data extension.
T1 Tie Trunk Connections
T1 trunks can be used to supply digital emulated tie-trunk connections. These
trunks can connect two MERLIN LEGEND Communications Systems or one
MERLIN LEGEND Communications System to another type of PBX or the central
office with digital (Switched 56 kbps) connections.
Tie trunk settings for these connections are similar to standard analog tie trunks.
The only difference between setting up a digital emulated tie trunk and an
analog tie trunk is that the Signaling Type setting (Type 1 Standard, Type 1
Compatible, Type 5 Simplex) is not meaningful.
Direction
The tie trunk direction may be administered in one of the following ways:
Two-way (factory setting). Calls can be made in both directions.
Outgoing Only. Outgoing calls only can be made.
Incoming Only. Calls only can be received.
Trunk Seizure Type
The trunk seizure type can be one of four settings. the setting should be
compatible with the signaling on the far end. The trunk seizure type must be set
separately for incoming (intype) and outgoing (outtype) calls. The intype and
outtype settings for the trunk seizure type can be programmed as one of the
following settings:
Wink Start (factory setting)
Delay Start
Automatic Start
Immediate Dial
NOTES:
1. Immediate Dial should not be used for DS1 Switched 56 data calls,
2. Automatic Start trunk seizure is not available on 5ESS and DMS-
because of the lack of trunk integrity checking. Auto Route by Line
Appearance only works with Immediate Dial and therefore cannot
be used with DS1 Switched 56 data calls.
100 central office switches.
Primary Rate Interface (PRI) and T1
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