3 947099
that neither require, nor provide, power are indicated
by a VPU of zero (0).
After you have chosen the page control interface,
speakers and accessories for your application, simply
add up all of the Valcom Power Units. If you come
out even or have power left over, your paging system
is complete. However, if you come out with more
VPUs required than provided, you will need
additional power.
The additional power required will be provided by
adding one or more Valcom power supplies as listed
in table 2.
Table 2 - Valcom Power Supplies
Part # Voltage Maximum
Current
Valcom
Power
Units
VP-324 -24VDC 250mA +6
VP-624B -24VDC 600 mA +12
VP-1124 -24VDC 1.0 amp +20
VP-2024 -24VDC 1.0 amp +20
VP-2124A -24VDC 2.0 amp +40
VP-4024C -24VDC 4.0 amp +80
VP-4124 -24VDC 4.0 amp +80
VP-6124 -24VDC 6.0 amp +120
VP-12124 -24VDC 12.0 amp +240
There are several cases when more than one power
supply will be required:
• When the power required exceeds the maximum
output of the power supplies available: Add
additional supplies as required.
• In large systems or systems with many one-way
horn speakers: Locate separate power supplies
near groups of speakers. Refer to the Valcom
Wire Gauge Guide for guidelines concerning
maximum allowable distances for power runs.
• When the paging system is in several buildings,
or on several floors of a single building: Locate
a power supply in each building, or on each
floor, that contains equipment requiring power.
Environment
Control Units:
Temperature: 0 to +40 Degrees C
Humidity: 0-85% non-condensing
Inside Speakers:
Temperature: -20 to +55 Degrees C
Humidity: 0-95% non-condensing
Horn Speakers:
Temperature: -20 to +55 Degrees C
Humidity: 0-95% non-condensing
E-Key, PABX, or Dedicated Single
Line Telephone Set
Additional
Zones
(multi-zone
units only)
Speakers
Power Supply
(if required)
One or more dedicated
single line telephone(s)
Block Diagram or Loop Start Trunk Port And/Or Single Line
Telephone Access of a Valcom Talkback Page Control/Interface
Audio To Up To 40
VALCOM One-Way
Self Amplified
VALCOM
Talkback
Page
Control/Interface
T
R
Telephone
System C.O.
Loop Start
Trunk Port
-AND/OR-
FIGURE 2
To provide handsfree answerback paging on 1A2, E-
Key, or PABX Systems, you will need a talkback
control, talkback speakers, and a power supply.
The speakers may be any of Valcom's 45 ohm
Talkback Speakers. In most cases, if the control unit
requires a power supply, the VP-624B will be
adequate. Larger power supplies may be required if
one-way speakers or horns are utilized.
Access will be from a C.O. line key on E-Key
Systems, from a loop trunk port on PABXs, or from
Tip and Ring on one or more dedicated single line
sets. A trunk circuit will be required on a PABX or
E-Key system.
Page Port Access
In general, telephone system page ports are not
capable of passing audio in both directions and,
therefore, are suitable for one-way paging only. In
the case of bi-directional page ports, contact
Technical Support for assistance in choosing the
appropriate talkback page control/interface.
Station Level Paging
Station level access to talkback paging systems may
be accomplished in certain instances by utilizing the
Valcom V-9940 Station Level Page Adapter. Due to
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