ONE ZONE DOOR ANSWERING UNIT
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
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
• 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
• Automatic cut-off after approximately 8 rings or
answer (whichever occurs first)
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.
• 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)
Temperature: 0 to 50 Degrees C
Humidity: 0 to 85% non-precipitating
When using the V-2900 with an Electronic Key
system or PABX, the following equipment is
1) 1 V-2900 Door Answering Unit
2) 1 C.O. Line Position (E-Key) OR
1 Loop Start Trunk Port (PABX)
4) 1 -24 Vdc power supply (included)
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)
4) 1 –24 Vdc power supply (included)
