Lucent Technologies 9400, 8400 manual Tandem

DEFINITY Enterprise Communications Server Release 8.2	Issue 1
Overview 555-233-002	April 2000
System Management Features
Trunk Management	82

Tandem

In an Electronic Tandem Network, DEFINITY ECS provides a variety of features on a network-wide basis. Here are a few examples:

■Uniform Dial Plan (UDP) — A unique four- or five-digit number assigned to each station on the network. Uniform numbering gives each station a unique number (location code plus extension) that can be used at any location in the Electronic Tandem Network to access that station, DEFINITY ECS enhances the standard UDP with the unrestricted 5-digit Uniform Dial Plan, which allows up to five digits to be parsed for call routing.

■Extension Number Portability — When employees move within the network, they can retain their extension numbers. The ability to keep extension numbers, and even Electronic Tandem Network and Direct Inward Dialed numbers, when moving to other locations within the company eliminates missed calls and saves valuable time.

■Traveling Class Marks — Traveling Class Marks are a mechanism for passing a caller’s facility restriction level from one Extended Tandem Network switch to another. Traveling Class Marks allow privilege checking to be passed across switches through the Electronic Tandem Network.

■Automatic Alternate Conditional Routing — You can control the routing of particular calls using conditional routing. For example, you can limit the number of communications satellite hops (communications satellite links used as trunks) in any end-to-end private network routing pattern. Limiting the number of satellite hops may be desirable for controlling transmission quality or call delay in both voice and data calls.

■Enhanced Trunk Signaling and Error Recovery — The reliability of Electronic Tandem Network calls is improved by allowing a trunk call to be retried on another circuit when signaling failures occur.

tandem switch: A switch within an electronic tandem network (ETN) that provides the logic to determine the best route for a network call, possibly modifies the digits outpulsed, and allows or denies certain calls to certain users.

tandem through: The switched connection of an incoming trunk to an outgoing trunk without human intervention.

tandem tie-trunk network (TTTN): A private network that interconnects several customer switching systems.

See also, ‘‘ATM-Port Network Connectivity (ATM-PNC)’’ on page 107.