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Hardware
DEFINITY Enterprise Communications Server Release 8.2
Overview
555-233-002
Issue 1
April 2000
Hardware
Though the primary components are the same, your DEFINITY ECS can vary widely in
size and appearance, depending on your capacity requirements. It may be as small as a
single wall-mounted cabinet, or it may be as large as several tall cabinets linked together
in the same room or even hundreds of kilometers apart. Regardless of configuration,
however, the system’s footprint is relatively small.
The DEFINITY system is essentially an arrangement of port networks and circuits that
connect incoming to outgoing communications ports. Up to three port networks can be
connected directly to each other. When there are more than three port networks, the
connections are made through a Center Stage Switch.
Processor Port Network (PPN)
Every DEFINITY ECS has one Processor Port Network (PPN). It is often the only
component in small systems. The PPN houses the Switch Processing Element.
The Switch Processing Element (SPE) contains the central processing unit, which
supervises system operation. It also contains a mass storage system for loading system
software and saving system translations.
Because your application requirements may vary widely, DEFINITY ECS has three types
of SPEs available with proven capacities of 70,000 calls per hour, 140,000 calls per hour,
and 250,000 calls per hour. The performance you realize will depend on the call
processing, administrative, and maintenance activities in which your system is engaged.
Expansion Port Network (EPN)
Expansion Port Networks (EPNs) are used when the system grows beyond the capacity
of a single port network or must serve geographically dispersed offices. EPNs provide
additional ports as needed. A system can have up to 43 Expansion Port Networks.
Center Stage Switch (CSS)
The Center Stage Switch (CSS) is a connection hub that provides port network
communication. It is an essential component of a DEFINITY ECS configuration if the
system is composed of more than three port networks. Often it is incorporated into
smaller configurations to allow for growth. The CSS consists of from one to three switch
nodes. Switch nodes are composed of one or two switch node carriers, depending on
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