Components
The following equipment is recommended when
using the V-2904:
•
1 - V-2904 Universal Four Door Answering
System
•
1 - C. O. Line Position (Electronic Key
System); 1 - Loop Trunk Position (PABX) or 1 -
400 type line card (1A2 key)
•
1 - Dedicated single line phone*
•
1 to 4 Valcom Doorplate Speaker(s)**
•
1 - VP-624B Power Supply
* A single line telephone cannot be connected to
both the V-2904 and an incoming central office
line.
** It is recommended that one talkback speaker
be used per door station. Use of more than one
talkback speaker per station may result in damage
to the V-2904. Up to 40 one-way amplified
speakers may be connected to a zone if the zone is
to be used as a one-way paging zone.
DESIGN
The V-2904, Universal Four Door Answering System
was designed to provide voice paging with handsfree
reply to up to four door speakers from a telephone
location. The V-2904 initiates ring-in on the
telephone system and sends a confirmation tone to the
door when a button is pressed at the door (Valcom
doorplate speakers are normally used in this
application). The individual at the phone responding
to the signal can converse with the person at the door
and determine if access should be allowed. If the
door is equipped with an electric strikeplate, the
person at the phone can enter a programmed code on
the telephone dial pad or press a remote button to
unlock the door to allow admission. When the system
is in use and another call is placed from a different
station, the person on the telephone will hear a call
waiting tone corresponding to that door location.
(Example: Beep-Beep for Station 2). The call will
remain waiting for a programmed period of time. If
this additional call remains unanswered, it will drop
off after the programmed period of time for call
waiting.
The V-2904 provides an alarm control output for
unauthorized entry. When the door lock relay is
activated and the door remains open longer than the
programmed period of time, a ground potential will
appear on pin 3 of the V-2904 (unauthorized door
opening) that can be used to signal a customer
provided alarm, auto dialer, etc. Also, if the phone is
on hook, the phone will begin ringing in a pattern
designating which door failed to close. (Example:
Station 3 - ring-ring-ring). If the phone is off hook,
any activity the phone is involved in will be
terminated and the phone will receive a momentary
warble tone, a station indication tone, the ringback
tone and be connected to the station with an open
door. After hangup, if the door is not closed, the
alarm condition will continue. If another
unauthorized entry is detected, it will override the
older one. When this new alarm condition is
resolved, the system will revert to the previous alarm
condition until all alarm conditions are resolved.
When indication arrives that a door is open while
door station is inactive, such as a break-in, the system
waits the programmed period of time (entry delay
time) for a confirmation of entry indicating the
opening as legitimate. When this does not arrive in
the programmed time frame or if it arrives and the
door is not closed at the end of the programmed time
period, an alarm will sound in the same manner as
described above.
The V-2904 also provides a background music input
and is designed to automatically cut off at individual
stations during a page or during an alarm situation. If
background music is to be installed, a low level music
source such as the Valcom V-2952 FM Tuner will be
required.
Another feature of the V-2904 is the All Call Page.
By pressing the number "8" or "0" on the telephone
dialpad, the person at the phone can make a one-way
announcement to all stations. The All Call is also
overridden during an Alarm Condition.
INSTALLATION
Cabling
A 25 pair cable with a female amphenol connector
should be run from the V-2904 to a 66B-type
punchdown block. The cables should be terminated
on the connecting block in standard color code.
Refer to Figure 2 - Block Connections for the
suggested pinout locations.
Mounting
The V-2904 is designed to be wall or shelf mounted.
When wall mounting the V-2904, secure the unit to
wall studs or a suitable brace, away from heat sources
or strong magnetic fields (motors, fans, power
supplies, etc.) with controls and connectors
accessible. (A plywood backboard 2 feet square and
at least 1/2 inch thick attached to wall studs would be
considered a suitable brace).
Four #10 x ¾ inch flat-head wood screws are
included for mounting. Fasten two screws on the
mounting surface, allowing them to protrude 1/8 inch
to ¼ inch. Place the chassis of the V-2904 onto the
screwheads at the mounting slots.
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