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System Overview
10
DEFINITY ECS Network Connections
DEFINITY Enterprise Communications Server Release 8.2
Overview
555-233-002
Issue 1
April 2000
TCP/IP Networks
DEFINITY ECS can also connect to Ethernet Local Area Networks (LANs) and the
Internet.
■ The optional DEFINITY LAN Gateway feature lets the DEFINITY system exchange
messages with LAN communications software.
■ DEFINITY ECS now supports Internet Protocol (IP) trunks using the TN802B
circuit pack and C-LAN card (TN799B). However, to connect to the network and do
signaling over IP, only the TN799B is required.
IP trunking is a good choice for basic, corporate voice and fax communications,
where cost is a major concern. IP-trunk calls travel over a company’s intranet
rather than the Public Telephone Network. So, for the most common types of
internal, corporate communications, IP trunks offer considerable savings.
IP trunking is usually not a good choice for applications where calls have to be
routed to multiple destinations (as in most conferencing applications) or to a voice
messaging system. IP-trunk calls are compressed to save network bandwidth.
Repeated compression and decompression results in a loss of data at each stage
and degrades the final quality of the signal. This is not a problem in normal,
corporate voice or fax calls. They go through two or three compression cycles at
most. But multipoint conference calls and most voice messaging systems add too
many compression cycles for acceptable quality.
■ DEFINITY ECS now includes the IP Solutions feature, which supports audio and
voice transmissions over a LAN or WAN. For more information about IP Solutions,
see ‘‘IP Solutions’’ on page 56.
ATM Networks
Three kinds of Asynchronous Transfer Mode (ATM) connectivity are available with
DEFINITY ECS. Any standards-compliant ATM switch can serve as the switch node
connecting DEFINITY ECS port networks. In this type of configuration, the ATM switch
replaces the Center-Stage Switch.
The three kinds of ATM connectivity DEFINITY ECS supports are as follows:
■ ATM Port Network Connectivity (ATM-PNC) provides an alternative to either the
direct-connect or Center Stage Switch configurations for connecting the Processor
Port Network (PPN) to one or more Expansion Port Networks (EPNs). ATM-PNC
provides reduced infrastructure cost and improved network manageability.
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