Lucent Technologies 555-230-024 manual Sdn

Distributed Communication System — Integrated SDN

and Non-Integrated SDN

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.

■Automatic Transmission Measurement System — You can use this feature to perform routine and on-demand maintenance tests on facilities in the Electronic Tandem Network.

■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.

Distributed Communication System —

Integrated SDN and Non-Integrated

SDN

For a single-location or multi-location company that requires several systems, Distributed Communications System (DCS) may be the answer. DCS is a network arrangement of private switches, referred to as nodes. The maximum number of nodes that can be in a DCS varies from 20 to 63, depending on the particular configuration of switches. DCS nodes can be physically located in the same building, spread across a campus, or scattered across the country or around the world. Tie trunks interconnect the switches that serve the DCS complex. The tie-trunk network may be configured as a tandem tie-trunk network, a main/satel- lite/tributary network, or an Electronic Tandem Network. The links connecting a Distributed Communication System may also be provided across a Software Defined Network.

The functions and features of Distributed Communication System are made pos- sible by the use of an advanced X.25 (BX.25) inter-processor data link connect- ing each switch, allowing call-processing to be passed from one switch to another. The data link supplies selected feature transparency and efficient utiliza- tion of facilities that can be shared.

Feature transparency means that features work the same from the user’s per- spective, whether the telephones involved are assigned to the same switch or different switches. Users in a DCS can dial each other with four or five digits as if they were all on the same switch.

Here are just a few examples of feature transparency in a Distributed Communi- cation System:

■DCS With Reroute — Distributed Communication System with Reroute optimizes trunk usage for certain DCS features.

■Leave Word Calling — Allows you to touch a button on your voice-terminal and leave a standard “call me” message with your name and phone number. When your DEFINITY ECS is linked with other switches in a DCS, you can call any employee in your company and press the Leave Word Calling button to automatically leave a message requesting a call back.

555-230-024 Issue 5 January 1998 12-19