Instruction manual

GLOSSARY
Tandem Tie Trunk Network (TTTN)
A private network that interconnects several customer switching systems by dial-
repeating tie trunks. Access to the various systems is dictated by codes that must be
individually dialed for each system.
Terminal Alarm Notification
A method of customer alarm notification using lamps associated with feature buttons on
multi-appearance digital or hybrid voice terminals or attendant console terminals or both.
Termination Restriction
A called party that is termination restricted is denied the ability to receive any calls at any
time.
Third Party Call Control
ASAI capabilities that allow a host/adjunct to take control of a call, to transfer the
etc.
call,
Tie Trunk
A telecommunications channel that directly connects two private switching systems.
Time Division Multiplex Bus
A special bus that is time shared by preallocating short time slots to each transmitter on
a regular basis. In a PBX, all port circuits are connected to the time division multiplex
bus permitting any port to send a signal to any other port.
Time Division Multiplexed (TDM)
A switching technique of spliting a large bandwidth into many small channels (called time
slots) in the time domain.
Time of Day Routing (TOD)
Time of Day Routing allows the routing of calls economically, based on time of day and
day of week. The customer has the option of changing the routing plan up to six times
each day for each day of the week. The choice of routing plan is made from a pool of
routing plans. These routing plans are used in conjunction with the routing of ARS and
AAR calls.
Toll Restriction
A calling party that is toll restricted cannot make calls to certain numbers defined on the
Toll List unless the number is contained on a UCL defined on the Toll Analysis form and
associated with the calling party’s COR.
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