User's Manual
Table Of Contents
- 1 REGULATORY AND SAFETY INFORMATION
- 2 PREFACE
- 3 SPECIFICATIONS
- 4 GENERAL INFORMATION
- 5 OPERATION
- 5.1 CONVENTIONAL STATION CONFIGURATIONS
- 5.2 ENCRYPTED STATION CONFIGURATIONS
- 5.3 MODES OF OPERATION
- 5.4 ENCRYPTION FORMATS
- 5.5 P25 CONVENTIONAL CONFIGURATIONS
- 5.6 PROGRAMMABLE FEATURES FOR CONVENTIONAL STATIONS
- 5.6.1 Conventional Stations (Setup)
- 5.6.2 Main Station Data
- 5.6.3 Push-to-Talk Options
- 5.6.4 Other Potentiometer Settings
- 5.6.5 Carrier Control Timer
- 5.6.6 Squelch Tail Elimination
- 5.6.7 Drop Out Delay Timer
- 5.6.8 Control Shelf Options
- 5.6.9 Station Remote Control
- 5.6.10 Auxiliary Control Relay
- 5.6.11 Squelch Operated Relay
- 5.6.12 Channel Guard Monitor
- 5.6.13 System Module - Digital Signal Processing
- 6 MASTR III ADC STATION DESCRIPTION
MM102558V1 R1A
5.6.9.1 Two-Wire/Four-Wire Operation
Two-wire describes a single pair of dedicated metallic wires in the form of discrete 600 ohm telephone
wire provided by a customer, 600 ohm dry (quiet line only) telephone line provided by a telephone
company, or the multiplexed equivalent provided by customer or telephone company owned equipment.
This type of circuit will support the bi-directional transmission of audio signals in the nominal 300 to
3000 Hz frequency range. Switched or multiplexed circuits generally will not pass DC Remote control
signaling. Support of DC control signals is available only with physical or metallic equivalent circuits
and may not be available in some areas.
Four-wire describes two pair of (usually) multiplexed dedicated telephone circuits with one pair going
each way. Each pair will support uni-directional transmission of audio signals in the nominal 300 to 3000
Hz frequency range. One pair is usually designated as the SEND pair while the other is designated as the
RECEIVE pair. DC signaling and control is usually not available. These circuits may be obtained for
voice only or for voice and/or data applications.
5.6.9.2 DC Remote
Control current signaling in a DC Remote Control system is achieved when a DC Remote Controller
applies current levels on a wire pair having end-to-end DC continuity. The wire pair may be provided by
the customer or a commercial wire line carrier, such as a telephone company. The overall circuit
resistance of the wire line between the console controller and the station must not exceed the maximum
loop resistance that the controller can support.
The six control current levels recognized by the remote T/R Shelf are:
-11 milliamperes 0 milliamperes
-6 milliamperes +6 milliamperes
-2.5 milliamperes +11 milliamperes
Station functions which can be controlled by these control currents are:
• Repeater Disable
• Channel Guard Monitor
• Transmit Frequency Selection
• Receive Frequency Selection
• Scan
• Receiver Selection (Auxiliary Receiver stations)
Please note that when leasing a wire line from a local wire line carrier, not all leased line services support
DC control applications.
Not all leased line services support DC control applications. Please check with your
wire line carrier before attempting DC control on a leased line.
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