3000 SERIES SWITCH

SECTION 2 3000 SERIES SWITCH
2.1 INTRODUCTION

A Multi-Net radio system is a combination of several key elements that together make up a communication system. By using the basic elements of a Multi-Net system as building blocks, a Multi-Net system can be designed to meet the communication needs of almost any type of user. Elements of a Multi- Net system are:

•Backbone

This consists of repeater site equipment including the links to the Switch.

•Control Consoles

Used for dispatch operators.

•Switch

Provides the interface between the Backbone and Control Consoles.

•RF Equipment

Consists of mobiles, control stations, and handheld portables.

Each Multi-Net site is an independent trunking system that processes calls between RF units, maintains fleet partitioning, and provides priority access control. The backbone elements are interconnected by either microwave, fiber optics, RF links or private telephone lines equivalent to a 4-Wire voice grade phone circuit.

A Switch contains a Channel Interface Module (CIM) for each repeater it controls, a Telephone Interconnect Module (TIM) for each telephone line used for interconnect calls, an Intelligent Dispatch Module (IDM) or Multi-Net Console Module (MCM) for each dispatch console and others described in this section. A single Switch can control up to 30 repeater channels all at one site or divided among a combination of sites (e.g. 3-10 channel Localities on one Switch). Each repeater has an identical Switch interface/logic panel that performs the call processing for the channel. The Switch provides interface between the Locality equipment and the control consoles and directs all activity in Multi-Net site applications.

RF units in the coverage area of one repeater site can communicate with RF units in the coverage area of other repeater sites through the Switch. Where more than 30 channels are required, multiple Switches can be used with communication between them to direct calls. Wide area radio coverage is provided to allow a mobile to talk to another mobile using a repeater hundreds of miles away. That repeater may be part of the same Multi-Net system or another Multi-Net system with phone lines or some other type of link that provides the communication path.

One or more dispatch consoles can be connected to the Switch using; direct connection, phone lines, or some other type of link. Depending on the capabilities of the particular console, the dispatcher can perform such functions as; place calls to specific mobiles, place calls to other dispatchers, and make a patch between two mobiles.

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