Issue 4
1
947291
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
PABX 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.
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)
