Algo 3026 Installation Manual

About the 3026 Doorphone

The 3026 Doorphone is a system comprised of a 3004 Door Station and 3025 Control Unit. This
guide applies to the installation of the 3025 Control Unit with a 3004 Door Station.

The 3026 Doorphone provides intercom capability for a telephone system through a spare trunk
port. The Doorphone emulates a telephone line by providing talk battery and ringing. Calls are
made by pressing the call button at the door station which causes the control unit to initiate
ringing to the trunk port. Anytime that the trunk port is off-hook, communication is provided
hands-free at the door station.

Installation

The 3026 Doorphone is shipped with the option switches and controls preset for optimum
performance and most common configuration. We suggest that the Doorphone be installed and
tested with these settings prior to any adjustments.

Wiring Requirements

Prewire at least one pair of 24 AWG twisted wire between the control unit location and
telephone system. The control unit must be installed in a dry protected environment (usually
beside the telephone system). The maximum distance between the control unit and telephone
system is 1000 meters or 3200 feet.

Prewire at least two pair of 24 AWG twisted wire between the control unit and door station. The
door station may be mounted outdoors in un-protected areas. Maximum distance is 300 meters
or 1000 feet.

Mounting

Install the door station into a recessed or surface mounted double-gang electrical box of the type
that would be used for two light switches or two duplex receptacles. A sealant should be used
behind the door station to prevent water from penetrating behind the door station. The door station
can be used outdoors in ambient temperatures -30 degC to +40degC (-22degF to +104degF).

The control unit is wall mounted within 1.5m (5ft) of a 120 volt 60 Hz AC receptacle for the
supplied 3242 external plug-in adapter.

Wire Connections

The door station connects to the control unit terminals 1-4. The numbers are identified on both the
door station and control unit.

The terminals marked T and R (tip and ring) connect to the telephone system trunk port. A
modular jack (TEL) is also provided on the rear of the control unit.

The remaining terminals (C, NC, NO) are for door or gate control and are explained in the section

Door Control.

3026 Doorphone

Installation Guide

P.4

DC3026CI-02

AUGUST 28, 2000

Algo Communication Products Ltd. 4500 Beedie Street, Burnaby, B.C. Canada V5J 5L2

Tel: [phone] Fax: [phone] http://www.algo.ca

Algo Communication Products Ltd. 4500 Beedie Street, Burnaby, B.C. Canada V5J 5L2

Tel: [phone] Fax: [phone] http://www.algo.ca

P. 1

Testing

With the option switches and level controls adjusted at factory default:

Spkr Volume: 1/2 turn counter clockwise from fully clockwise position
Mic Sensitivity: 1/8-1/4 turn clockwise from fully counter clockwise position
Switch 1: XXXOOOOO (1,2,3 on - 4,5,6,7,8 off)
Switch 2: OOOOOXOO (6 on, 1,2,3,4,5,7,8 off)

Pressing the call button should turn on the door station light momentarily and cause the
telephone system to ring wherever assigned. The switch 1 settings will provide a ring cadence of

1.5 sec on followed by 3 sec off. (Each switch position contributes 1/2 sec to the ring cadence and
the cycle repeats every 4.5 seconds). The switch 2 setting allows for 5 ring cycles before the
ringing will stop.

Upon answer, the ring will stop and communication is established with the visitor. Communication
may be established at any time by accessing the telephone system port even if ringing was not
initiated by the call button.

Level Controls

On the rear of the control unit two controls are provided. Spkr Volume adjusts the speaker volume
and is maximum when fully clockwise. This control may be adjusted to suit but should not be
turned down to minimum when door control functions are used. The factory setting is ideal for most
installations.

The Mic Sensitivity control should not normally be adjusted. This control is factory set for
optimum performance and any adjustment may prevent proper switching of the speakerphone

circuits.

Option Switches

There are two option switches of 8 positions each exposed through the bottom of the control unit.
Switch 1 controls ring cadence pattern and switch 2 controls the number of ring cycles provided in
response to the call button.

Switch 1:

Each position contributes 0.5 seconds to the ring cycle which repeats every 4.5 seconds. The
switch is scanned each cycle and for every switch position that is on, ring is output. For switch
positions that are off, no ring is output. There are 256 ring cadence possibilities to distinguish the
Doorphone from other incoming lines when ring cadence is repeated by the telephone system to
station locations.

Switch 2:

The number of ring cycles can be selected as follows. If more than one switch is in the on position,
the lowest position will control the ring cycles.

Position Position
1 (No ring cycles) 5 Four ring cycles
2 One ring cycle 6 Five ring cycles
3 Two ring cycles 7 Six ring cycles
4 Three ring cycles 8 Nine ring cycles

NONE - NO LIMIT, RING UNTIL ANSWERED

Door Control

The 3026 Doorphone includes a door control relay for telephone systems that provide tone dialing.
Upon detection of the digit 6 from the telephone system the door control relay will operate for 3
seconds. (This time can be adjusted by opening the control unit and adjusting an orange control.
Time can be adjusted from momentary to about 10 seconds.)

When idle the C (common) terminal is connected to the NC (normally closed) terminal. When the
relay is activated, the C (common) terminal is connected to the NO (normally open) terminal. The
relay can switch up to 30VDC or 30VAC at 5 Amps. Do not use these contacts to directly switch

mains power such as 120 or 240VAC.

These relay contacts are normally used to switch a customer supplied power supply to a customer
provided door solenoid or similar mechanism.

Compatible Telephone Systems

The Doorphone is designed to emulate a central office line from the public switched telephone
network. Do not connect the Doorphone to a telephone line. The Doorphone works with any
device with tone dialing that is normally connected to a loop start trunk from a central office. The
current revision C design is compatible with all known brands of PBX and key telephone systems
including Northern Telecom Meridian Universal Trunk Cards.

The Doorphone can also be used on standard telephones, answering machines, and cordless
phones provided that these devices connect only to the Doorphone. No line sharing is possible
without additional equipment to allow use of these devices for both Doorphone and telephone
network, unless a two line device is used.

Algo manufactures Doorphones for station port applications that provide telephone emulation, as
well as a variety of products in rack mountable configuration for prison, university, airport and other
applications that require many units.

Electrical Specifications:

Power Supply 120V 60Hz 9W plug in adapter. CSA and UL approved.

Output to Control Unit 24Vdc 200mA 2.1mm female plug center negative.
Maximum input to Control Unit 26Vdc.

Talk Battery 24V nominal, 20mA current limited.

Impedance 600 ohm nominal

Maximum Distance Tip and Ring DC loop limited to 600 ohms including telephone.
Tip and Ring Maximum recommended distance is 1 km (3200 ft) twisted pair 24 AWG.

Maximum Distance Maximum recommended distance is 300 m (1000 ft) twisted pair 24 AWG.
Door Station

Door Control Relay Maximum voltage 30Vdc or 30Vac Maximum current 5 A.

P.2

P.3

Algo Communication Products Ltd. 4500 Beedie Street, Burnaby, B.C. Canada V5J 5L2

Tel: [phone] Fax: [phone] http://www.algo.ca

Algo Communication Products Ltd. 4500 Beedie Street, Burnaby, B.C. Canada V5J 5L2

Tel: [phone] Fax: [phone] http://www.algo.ca