Wheelock MX-8 Mixer Specifications download pdf (Page 22)

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Single Zone CO Port Paging Applications

Talkbatterycanbeprovidedwithalteredandregulated24VDCpowersupplyasillustratedbythe

following diagram

Note: This diagram shows the output of the telephone system feeding the input of a typical Wheelock ampli-

er for distribution on a 70 volt system. That same output could also directly feed self-amplied speakers or

Wheelock talk back speakers in a similar manner.

Accessories

Now that we have built a paging system and interfaced it with a telephone system let’s take a look at some different

accessories that can be utilized.

Common Audible

If the telephone system has no night ring feature, you can activate a tone generator by using a common audible, such

as a Wheelock CA-312-1 or CA-622-1. These devices connect to all of the CO lines ahead of the EKSU or PBX main-

frame and then put out a common ring signal whenever a call comes in on any of the lines. This common output can

be either a dry contact or network ringing voltage, either of which can be used to activate a tone generator — or other

types of signals for that matter.

PRM-150 Pre-Amplier

Besides correcting for proper impedance matching and compensating for long wire runs, the PRM-150 functions as a

mastervolumecontrolforagroupof600Ohm,SelfAmpliedspeakers.ThePRM-150requires24VDC.

TELEPHONE SYSTEM

UNUSED CO PORT

2 WIRE

CABLE

2 WIRE

CABLE

POWER SUPPLY

(+) (-) SPARE

TELEPHONE

INPUT

Common Audible Interfaces

Wheelock’s Series CA-622-1 Common Audible Control Unit can

monitoruptosixtelephonelinestoprovide“AllCall”signalingor

“Zone”signaling.Twoseparatezonescanbesignaledandtwoor

more control units can be ganged to monitor additional input lines.

The economical CA-312-1 model monitors three tip and ring lines.

These interface products are designed for Electronic Key Systems

andPBXor1A2systems(withtouchtonestationsets)thatdonot

offer a common audible ring circuit or dry contact closure for night

bell connection or zoned ringing.

Both models provide a choice of two outputs for connection of alert

signals: standard ringing voltage output or contact closure. A wide

selection of audible and visual alert signals is available to operate

directly off the ringing voltage output. Alternatively, Wheelock’s dry

contact interface or economy power supply can be connected to the

optional contact closure output to drive 24 VDC alert signals.

Front Cover

OUTPUT OPTIONS: 1 = Ringing Voltage

2 = ContactClosure:(useWheelock’s

DCI-24-24 or EPS-2401 to drive

  24VDCalerts)

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Wheelock MX-8 Mixer Specifications Page 22

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