Instruction manual

DEFINITY® Business Communications System and GuestWorks® Issue 6
Overview
555-231-208
Issue 1
April 2000
Introduction
2-7Hardware
2
Center-Stage Switch
The Center-Stage Switch (available only on an “r” system) is a connection hub
that provides port network communication. It is an essential component of a
system configuration if the system is composed of more than three port networks.
Often it is incorporated in smaller configurations to allow for growth. The
Center-Stage Switch consists of one to three switch nodes. Switch nodes are
composed of one switch node carrier for both standard and high reliability. Each
carrier can reside in the Processor Port Network cabinet or in an Expansion Port
Network 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 Cen-
ter-Stage Switch to provide the connections required for voice and data informa-
tion transfer. The Center-Stage Switch 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 end point pairs for each link. End points
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). This cabinet functions like the compact
single
-carrier cabinet, but up to three of the cabinets can be connected
together. The CMC can be mounted on the wall and is intended for smaller
configurations.
■ Single-Carrier Cabinet. These cabinets are modular, can be connected to
Expansion Port Networks, and can be stacked up to four high. They are
often used by small businesses that are growing or that expect to grow.
■ Multicarrier Cabinet. A tall cabinet that contains up to five carriers and can
be connected to Expansion Port Networks. Multicarrier cabinets are used
by businesses that require larger configurations.