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USER GUIDE | MT-4E PAGING SYSTEMS

Chapter 3: MT-4E Paging System ComponentsPage 22

PAGING MODULATOR (CI-PM-3)

The MT-4E modules may be conﬁ gured to operate in digital and/or analog paging conﬁ gurations, such

as base station paging, remote paging or simulcast paging using the CI-PM-3 paging modulator. The

CI-PM-3 is conﬁ gured via the front panel switches and internal jumper settings.

The CI-PM-3 paging modulator is required for digital only or mixed mode (digital and analog) paging

conﬁ gurations, but is not required for non-simulcast, analog only paging conﬁ gurations. The AC-3E

audio control card can be substituted for non-simulcast, analog only paging conﬁ gurations.

The CI-PM-3 paging modulator is shown in Figure 3-13.

The CI-PM-3 paging modulator supports both analog and digital paging formats, and

can transmit GSC, Multitone Mark IV / V / VI and VII, POCSAG and other 2-level

modulation schemes at transfer rates of 512, 1200 and 2400 baud.

The CI-PM-3 supports 4-level modulation formats at data transfer rates up to 6400

bps. Each of the four modulation deviation levels can be independently set, making

the CI-PM-3 suitable for use in such pager signaling schemes as Motorola’s FLEX™

paging protocol.

Figure 3-13: CI-PM-3 Paging Modulator

The CI-PM-3 uses an on-board frequency reference source consisting of a 10 MHz OCXO with

a frequency stability of +/- 0.35 ppm from -30 C to +60 C. For high stability applications (such as

Simulcast), the CI-PM-3 paging modulator may be conﬁ gured to use an external high stability reference

source (i.e. rubidium, GPS or WWV) with a standard stability greater than or equal to 0.002 ppm, to

discipline the on-board phase-locked loop OCXO oscillator.

The CI-PM-3 Paging Modulator includes the following standard features:

• low power analog and CMOS control circuitry (current draw of less than 250 mA).

• extended operating temperature range.

• front panel selection of PLL OCXO using external high stability frequency reference.

• jumper and line selectable analog/digital paging conﬁ guration.

• balanced 600 ohm / single-ended microphone input.

• selectable digital delay for simulcast operation.

SET

DEV

4 LEVEL

SETUP

MODE

DATA

MODE

A D

2 LEVEL

SET

MOD

NORM

REF IN

REF OUT

PAGING

MODULATOR

DATA

INT

FREQ

REF

EXT

DATA / CTRL

PORT

PULL DOWN

TO REMOVE

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