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DEFINITY Enterprise Communications Server Release 8.2
Overview
555-233-002
Issue 1
April 2000
System Overview
3
Hardware
whether the system is being duplicated for enhanced reliability. Each carrier can reside in
the PPN cabinet or an EPN cabinet. One switch node can accommodate up to 15
Expansion Port Networks.
Fiber Link Administration
Port cabinets are connected via direct fiber links or through fiber links to a Center Stage
Switch to provide the connections required for voice and data information transfer. The
CSS is composed of switch node carriers that are interconnected by fiber links. It
provides both circuit-switched and packet-switched connections. Fiber Link
Administration creates the translation data defining these links by identifying the endpoint
pairs for each link. Endpoints can be an expansion interface or a switch-node-interface
circuit pack.
Carriers and Cabinets
Carriers are enclosed shelves composed of vertical slots that hold circuit packs. Circuit
packs make up the logic, memory, and switching circuitry for the system. Port circuit
packs connect to telephones, computers, and communications lines. The carriers are
designed to accept any type of port circuit pack in each circuit pack position.
Each cabinet contains at least one carrier. The circuit packs fit into connectors attached
to the rear of the slots. Every connector is connected to signal buses and power supplies
in the cabinet.
The cabinets also house equipment that supplies power backup, ringing signal voltage,
and mass storage for software translations.
There are three types of cabinets
■ Compact Modular Cabinet. (CMC)
■ Single-Carrier Cabinet. (SCC)
■ Multi-Carrier Cabinet (MCC))
Compact Modular Cabinets
The Compact Modular Cabinet (CMC) is a small, wall- or floor-mounted unit that supports
a single port network. It is thus well-suited to small, growing organizations. For a modest
initial investment, the CMC gives you the capacity that you need now. As your
organization grows, you can connect up to two more modular cabinets to expand the
existing port network. Each CMC can hold up to 10 circuit packs. Figure 2 shows a
Compact Modular Cabinet.
233002_1.book Page 3 Monday, February 21, 2000 8:28 AM