United Data Corporation

A Proctor Company


Long Loop Adapters


Telephone Demonstrators

Privacy Modules

Telephone Power Supply



Off Premise Extension (OPX) Line

46222 LLA
Model 46222 & 46224 Long Loop Adapters

The Proctor Model 46222 Long Loop Adapter provides Off Premise Extension (OPX) and dial long line capabilities for both PBX and key system applications. The self-contained unit can be used wherever common 115 AC power is available. It provides 48 volt line feed and 20 Hz ringing for operating a standard DTMF telephone device without using telco facilities or special equipment and power. The unit uses low loss, balanced transmission circuitry to provide a high-quality talk path over long loops, up to 30,000 feet in length. The unit corrects and transmits hookswitch flash to allow activation of system features from the remote device. The 46222 is ideal for facilities requiring reliable, independent off-premises or on-premises communications, such as military bases, entry gates and guard posts, and large school campuses or business complexes.

LineSep.gif (1382 bytes)

How It Works

46222 Schematic

The 46222 is a stand-alone long loop telephone circuit that works independently of the public switched telephone network. The user simply plugs the unit into the nearest standard AC outlet, plugs in the line cords of the remote device and the PBX system or KSU, and it's ready to work. Each 46222 extends the loop length of the line out to 30,000 feet (24 AWG wire). The unit works with systems that use standard 2-wire ringing and also converts 3-wire DC ringing to standard 2-wire bridged, 20 hz ringing. It includes RJ11 modular jacks for quick connection of the line cords (special modular adapters are available for retro-fitting bare wires to the jacks). In addition to providing on- or off-premise extensions, the 46222 can be used to interconnect key systems, to allow sharing of system features, and to convert low-voltage system lines to telco standards, for use with voice mail, facsimile and other special equipment.

Typical Applications

46222 Application

LineSep.gif (1382 bytes)

Key Benefits

    Provides a single 48Vdc OPX line
    without using telco facilities.
    Completely self contained; includes its own
    power supply and ringing generator.
    Extends loop length to 30,000 feet.
    Works with any standard or cordless DTMF
    phone device.
    Works on short or long wiring loops.
    Standard 115 VAC operation.
    Modular jacks allow quick connection of
    OPX device and phone system.
    Can be used as a tie line between key
    UL Listed; FCC Registered.

Model 46222 Specifications

    • Modular RJ11 Jacks
    • Operating Voltage: 95 to 130 VAC, 60 Hz
      250 mA maximum, 30 watts
    • DC Loop Length: Up to 30,000 feet, 24 AWG wire
      1900 Ohms maximum (including phone)
    • Loop Current: 20 mA @ 1.5K Ohms loop
      and Type 2500 telephone; 60 mA max at 0 Ohms
    • Loop Voltage: 50 VDC nominal
    • Ringing Generator: 105 VRMS at 20 Hz nominal
      (5.0 REN load)
    • Dialing: DTMF
    • Flash Timing: Hook flashes from 200 to 500ms,
      increased to 500ms
    • DC Loop Length: Limited only by PBX
      or key system.
    • Loop Voltage: Accepts 0 to 60 Vdc, either polarity
    • Internal Resistance: Seized, 200 Ohms (nominal)
    • Voice Coupling: 1:1 Transformer 600 ohm
      impedance, idle termination
    • Ringing Detector: 50 to 160 Vac, 16 to 67 Hz bridged,
      or 3-wire DC signaling protocol.
    • System Ringer Equivalence: 0.3 REN
    • Operating Temperature:  0 to 50C (32 to 122F)
    • Storage Temperature:  -20 to 85C (-4 to 185F)
    • Humidity: 0% to 95% (Non-Condensing)
    • Dimen: 9.13" (23.19cm) W x 2.36" (5.99cm) H
      x 8.0" (20.32cm) D
    • Wt: 4 lbs, 9 oz (2.06 kg) 



Copyright United Data Corporation, Inc.


Dial-Up Test Set (51200-S)

Dial-Up Test Set (51200F23)

Leased Line Test Set

PBX Test Set

Call Collector



Production Equipment

Lab Equipment

Plastic Housings