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T-1
Tandem Switching of TIE Trunks - 2/4-Wire
General Description
This feature allows trunk-to-trunk connections through the switching system, without the need for any
Attendant assistance or control. The major use of this feature is in association with the Dial Tandem TIE
Line Network to allow TIE Line connections and incoming TIE Line calls automatic access to, and
completion of, local Central Office calls.
Operating Procedure
To operate:
1.
Lift the handset; receive Dial Tone from the distant office.
2.
Dial the TIE trunk access code; receive Dial Tone from the PBX.
3.
Dial another TIE trunk access code.
OR
Dial the Central Office access code; receive Dial Tone from the other distant PBX or local Central Office.
4.
Dial an extension number of the distant PBX.
OR
Dial the Central Office exchange number (local or toll).
Service Conditions
1.
When using a 2-wire application, there may be an appreciable decrease in transmission decibel
levels.
2.
When using a 4-wire application, an TLT circuit card is required for every four TIE Lines. This
circuit card provides amplification/attenuation so that the desired transmitting and receiving
levels can be maintained, providing the overall Tandem system with transparency.
3.
When TIE trunks are busy, the calling station will receive Busy Tone.
4.
Each incoming TIE trunk may have various restrictions for TIE-to-Central Office calling.
5.
Careful consideration should be given to access code numbering plans to avoid unnecessary
loss of access codes and code duplication within the same system.
6.
Tandem switching can also be accomplished via the ATTENDANT CONSOLE [A-3].
7.
There is no limitation to the allowable number of Tandem Switching connections.
Interactions
1.
The connection described is a user outside the system connected to an incoming TIE Line to an
outgoing TIE Line. TRUNK-TO-TRUNK CONNECTION [T-10] is established by either the
Attendant Console or a station user and is connected to two outgoing trunks.
2.
TOLL DENIAL [T-6]: If TOLL DENIAL is applied to an incoming TIE Trunk group, the calling
station user is routed to Reorder Tone if an attempt is made to dial-access a toll call.
3.
Incoming dial repeating TIE Trunks (second dial tone) can connect to the following types of
outgoing trunks:
a.) Dial repeating TIE trunk (second dial tone)
b.) Senderized TIE trunk
c.) CO trunk
d.) FX trunk
NEAX2400 ICS Business Features and Specifications
NDA-24143, Issue 4
Tandem Switching of TIE Trunks - 2/4-Wire
T-1
Page 505
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