Valcom V-2900 Service Manual

V-2900

ONE ZONE DOOR ANSWERING UNIT

INTRODUCTION

The V-2900 Door Answering Unit provides voice
contact from a designated telephone station to a door.
When used in conjunction with a door plate speaker,
pressing the pushbutton on the door plate speaker will
cause the phone to ring (1 second on, 4 seconds off).
By answering the call, the system user can converse
with the person at the door. (The telephone may also
call the door speaker).

The V-2900 can be used with a dedicated single line
telephone set, a loop start trunk port of a P ABX or C.
O. Line Position of an E-Key System.

Refer to Figure 1 for a block diagram of a typical
installation.

FEATURES

• Loop start trunk access from a PABX or C. O.

Line Position of an E-Key system

• Dedicated single line telephone access

• Phone to speaker volume control

• Speaker to phone volume control

• Screw terminals for all connections

• -24 Vdc powered (power supply included)

• Built-in 30 Hz ring generator

• Cycle ringing (1 second on, 4 seconds off)

• Tone at speaker when button pressed to access

unit

• Automatic cut-off after approximately 8 rings or

answer (whichever occurs first)

SPECIFICATIONS

Input Impedance: 600 Ohms
Input Level: Nominally -10dBm
Output Impedance: 45 Ohms
Ring Supply: 90 Vac, 30Hz
Power Req.: -24 Vdc at 250 mA nom.

VSP-V-2900

Issue 3

Dimensions/Weight

• 8.25"H x 4.5"W x 2.35"D
(20.96cm H x 11.43cm W x 5.97cm D)

• Weight: 3.1 lbs. (1.41 kg)

Environment

Temperature: 0 to 50 Degrees C
Humidity: 0 to 85% non-precipitating

ACCESS

E-Key or PBX Access

When using the V-2900 with an Electronic Key
system or PABX, the following equipment is
required:

1) 1 V-2900 Door Answering Unit

2) 1 C.O. Line Position (E-Key) OR
1 Loop Start Trunk Port (PABX)

3) 1 Door Plate Speaker

4) 1 -24 Vdc power supply (included)

Single Line Phone Access

When using the V-2900 with a dedicated single line
telephone, the following equipment is required:
(NOTE: A dedicated single line telephone is one that
is only connected to the V-2900 Door Answering
Unit. A single line telephone may not be connected to
both the V-2900 and a central office line.)

1) 1 V-2900 Door Answering Unit

2) 1 Single Line Telephone (Dedicated)

3) 1 Door Plate Speaker

4) 1 –24 Vdc power supply (included)

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DOOR PLATE
SPEAKER

E-KEY
C.O.LINE
POSITION

-24VDC
POWER
SUPPLY

V-2900
DOOR
ANSWERING
UNIT

FIGURE 1 - SIMPLIFIED BLOCK DIAGRAM

INSTALLATION

Remove the metal mounting plate from the rear of the
V-2900 enclosure. Using two #6 3/4" wood screws,
mount the plate in a vacant space on the backboard
with the telephone system common equipment. Both

mounting holes must be utilized to insure secure
mounting of the unit. See Figure A.

Open the V-2900 enclosure to access connections and
option switches. Slide the rear of the unit (contains
the board) onto the mounting plate and lock in place
with screw provided. Make connections.

Connections

1. Connect Tip and Ring of the C.O. Line Port

from a PABX, key system or single line
phone to screw terminals labeled Tip and
Ring on the V-2900.

2. Connect –24 Vdc ("-" terminal) from the
power supply to screw terminal on V-2900
labeled –24 Vdc.

3. Connect GND ("+" terminal) from the power
supply to upper screw terminal on V-2900
labeled GROUND.

4. Connect talkback speaker Tip and Ring to
screw terminals labeled SPKR on the
V-2900.

5. Connect door pushbutton connections
(momentary closure) to the second screw
terminal labeled GROUND and SPKR SW
on the V-2900. (See Figure 2).

6. Replace cover and lock in place using the #6
1/2" screw included with the unit.

Volume Controls

Two volume controls are used to adjust the phone to
speaker volume and speaker to phone volume. (See
Figure 2 for location).

PUSHBUTTON

OPERATION

The V-2900 is a single talkpath unit which allows an
individual at a external location to converse with
another individual inside a building. When the
V-2900 is used with a door plate speaker, pressing
the pushbutton on the door plate speaker will cause
the phone to ring within the building (1 second on, 4
seconds off). By answering the call, the system user
can converse with the person at the door. Similarly,
the person at the telephone location may access the
door speaker by dialing the access code or pressing
the line button corresponding with the loop start trunk
port or C. O. Line position of the PABX or E-Key
system that the V-2900 is connected to. (In the case
of a dedicated single line telephone, simply going off­hook will access the door speaker).

NOTE: Operation is the same when used with a
dedicated single line telephone, loop start trunk port
of a PABX, or C. O. Line position of an E-Key
system.

TECHNICAL ASSISTANCE

Assistance in troubleshooting is available from the
factory. When calling, you should have a VOM and a
test set available and be calling from the job site.
Call [phone] and ask for Technical Support,
or call [phone] for Valcom 24-hour
Automated Support or visit our website at
http://www.valcom.com.

Valcom equipment is not field repairable. Valcom,
Inc. maintains service facilities in Roanoke, VA.
Should repairs be necessary, attach a tag to the unit
clearly stating company name, address, phone
number, contact person, and the nature of the
problem. Send the unit to:

Valcom, Inc.

Repair and Return Dept.

5614 Hollins Road

Roanoke, VA 24019-5056

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