Specifications

0003097 Revision A

Product Overview

The Mitel Networks™ SX-2000

LIGHT system is an advanced, fiber-distributed telephone

system that is designed for larger organizations or for networked telecommunications

environments. The distributed architecture separates the control node from peripheral,

application, and network access nodes and links them by multimode fiber optic cable. The

system can be configured to meet the communication needs and physical layout of virtually

any enterprise -- whether a single office, a campus, or multiple sites spread across a wider

geographic area. The Mitel SX-2000 LIGHT system supports up to 3000 telephones in a single

system configuration. However, if the number of users exceeds the 3000-user capacity of a

single system, a virtually unlimited number of systems can be "clustered" to provide a seamless

network by using digital trunking and SX-2000 private network applications.

For smaller, low-cost installations, the SX-2000 system can be configured as a single-cabinet,

non-redundant system. This configuration provides feature-rich telephone service to small and

medium-sized enterprises that require up to 400 lines. Non-redundant configurations include

the Non-redundant SX-2000 LIGHT system and the SX-2000 MICRO LIGHT system. The 9"

non-redundant control cabinet supports up to four expanded peripheral nodes or four DSU

nodes (two DSU cabinets), and the 18" non-redundant control cabinet supports up to eleven

expanded peripheral nodes or five DSU nodes. The SX-2000 MICRO LIGHT system supports

up to four expanded peripheral nodes or two DSU nodes.

For larger installations, where high reliability is required, the SX-2000 LIGHT system can be

configured as a multi-cabinet, control redundant system. The redundant main control cabinet

provides full back-up, including independent power supplies, so that system operation will not

be affected if a main control component fails. When the system switches to the alternate main

control, calls in progress are not dropped and callers are unaware of the system event. The

redundant main control cabinet can support up to eleven expanded

peripheral nodes located

up to 8.7 miles (14 kilometers) away. The redundant main control cabinet also supports up to

five

DSU cabinets.

System Architecture

The SX-2000 LIGHT system has two levels of control: main control and peripheral control; the

functions are handled by the main controller and peripheral switch controller cards, respectively.

The main control communicates with the peripheral switch and DSUs by using the

serial-communication message links and circuit switch links. The main control sets up all calls

and establishes the paths through the circuit switch. The main control includes the following

functional subsystems:

• Message System: The message system links the main control to the intelligent sub-

systems and handles all protocol control (including handshake, message processing, error

check, reformat, redirection, queueing, and maintenance functions). The messages in-

clude off-hook, digits, and other signaling information collected by the peripheral switch

controller.