ZETRON 2000 Series User Manual download pdf (Page 5)

The Common Control Unit, or CCU, is the central

“switch” that routes audio and control signals between

the dispatch operating positions and external

communications devices such as radios and telephone

lines. The modular architecture of the Series 4000 CCU

allows a system to be configured to economically meet

the user’s current needs while providing a cost-effective

upgrade path for future expansion. Two sizes of

common controllers are available. The Model 4020

provides a single card cage solution for applications

requiring up to 20 channels. For larger applications, the

Model 4048 accommodates up to 48 channels and 16

operating positions. Both employ the same architecture

and a common set of circuit cards (with the exception of

minor differences in the patch card). Each can be

configured for “no single point of failure” with dual

system busses, dual power supplies, and dual

controllers. Standard features include a dial-up

diagnostic port for remote monitoring, provisions for

connection of an external time reference, and dual

voltage (12 VDC and 120/240 VAC) operation with the

Model 4048 power supply. An optional Radio System

Management software package allows users to collect

usage statistics on a “by channel” and “by position”

basis.

Circuit card options to populate the Model 4020 and

4048 CCU include: System Traffic Controller, Console

Interface, Dual Channel T/R Control, Auxiliary I/O, and

Patch.

The System Traffic Controller, or STC, performs

the central control function for all cards in the CCU.

STC’s may be operated individually, or in a dual

redundant configuration with one operating in “hot

standby”. In the event that the primary card fails, the hot

standby unit assumes control without interruption. The

STC features ports for remote diagnostics via a modem,

a diagnostic printer output, an external time reference,

and radio system management output to an external PC

executing the Radio System Management software.

The Console Interface Card provides the interface

circuitry to connect the CCU to one dispatch console

position (desktop, rack, or video).

Rackmount Console - Model 4118/4115B

For users who require a rackmount installation or need a console

with 24 channel capability, Zetron offers the Model 4118 Dispatch

Console and Model 4115B Console Expander. Each unit is 5 1/4"

high x 19" wide with a panel designed to facilitate mounting in a

standard EIA 19" rack. The Model 4115B Console Expander

provides 60 programmable function keys, each with dual LEDs for

status indication of key functions. At least one M4115B is required

with each M4118. This configuration provides functionality that is

identical to that of the M4018 with the added advantage of

expandability. Up to three M4115Bs can be interfaced with an M4118, providing as many as 180 buttons for control

of channel, auxiliary I/O, Instant Call pages, and other functions.

COMMON CONTROL UNITS

Model 4020

The Dual Channel T/R Control Card provides a

two-channel interface capability for base stations,

control stations, repeaters, “POTS” telephone lines,

PAs, or intercoms.

Selected dual channel cards can optionally be

configured with “Channel Check”, an integrated four

minute per channel instant recall recorder.

Each Auxiliary Input/Output Card provides relay

outputs and discrete inputs for control/monitoring of

external devices. Typical applications include room light

control, remote door opening, intruder alarms, intercom

signaling, and voter inputs. The card also contains an

IRIG-B decoder to support an interface with external

time references using that protocol.

The Patch Card is mandatory for applications

requiring a cross-channel patch capability. Both radio-

to-radio and radio-to-telephone patches are supported.

A ten-patch option is available for the Model 4020 while

the Model 4048 Patch Card options support up to 24

patches.

Model 4048

(cabinet not included)

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ZETRON 2000 Series User Manual Page 5

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