United Data Corporation

A Proctor Company


Long Loop Adapters


Telephone Demonstrators

Privacy Modules

Telephone Power Supply



Group Privacy

41404 Line Guard
Model 41404 Line Guard

The Proctor Model 41404 Line Guard privacy module can be used in the office to assign priority access to a selected group of telephones when two groups of phones connect to the same line. The priority group of telephones is given uninterrupted use of the phone line once one of its phones or devices accesses it. The other group of phones can only use the line when all the priority group phones are on-hook.

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How It Works

41404 Schematic

The 41403 installs in series with the tip and ring at a terminal location common to two groups of telephones or devices. It restricts an entire group of phones or devices from accessing a line already in use by phone devices in the other group. Group '1' phones/devices will always have access to the line; Group '2' phones/devices can only access the line when not already in use by Group '1', or when Group '1' "Hook Flashes" them in. 41404 modules may be cascaded to provide different levels of priority for selected groups.

Typical Group Application

41404 Application

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Key Benefits

    Works with 24Vdc or 48Vdc telephone systems
    No limit to group sizes.
    Single-line modules (41403, 41412)
    can be added to groupings to
    facilitate individual phone priority.
    The modules do not require any external
    power source.
    The modules do not affect transmission,
    signaling, or pulsing characteristics
    of the line circuit.
    Priority group can include other
    non-priority phones in a conference
    call with a hookswitch flash.

Model 41404 Specifications

    • Unterminated Solid Wires
    • Operating Voltage: 24VDC or 48VDC
    • Loop Limits: Up to 1.5k Ohms
    • Insertion Loss - Unoperated: <0.2dB @ 1kHz
    • Insertion Loss - Operated: 100dB minimum
    • Ambient Temperature:  0 to 50C
    • Relative Humidity: 5% to 95% (No Condensation)
    • Dimen: 1.25" (32mm) W x 0.75" (19mm) H
      x 0.6" (15mm)D
    • Wt: 1.0 oz (28 grams) 



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