Specifications

Headset Port.
The headset port facilitates the connection of an operator’s headset used to achieve quiet
operation at the dispatcher workstation.
Microphone Port.
The microphone port facilitates the connection of a desk stand microphone as may be
employed in a taxi dispatcher work station.
Telephone Port.
The DRC-1 is capable of operating in common headset mode. This mode enables a single
headset to be switched between radio traffic and telephone traffic. By using this facility, the
dispatcher can make and receive telephone calls without missing radio traffic. This
connection is designed to plug into a desktop telephone unit, which has a headset connector.
Line Port.
The line port facilitates connection of the DRC-1 to either a private telephone line, which
connects the dispatch workstation to the radio base station, or any communication port
presented as 4 wire, 2 pair (send and receive). See specifications for levels and frequencies.
Line port connections RJ45
Pin
Number
Signal Notes
1 Line in 0
600Ω balanced
2 Line in 1
600Ω balanced
3 Line Out 0
600Ω balanced
4 TX data + Used with DS32 switch
5 TX data - Used with DS32 switch
6 Line Out 1
600Ω balanced
7 PTT O/p Active low
8 Ground
Telephone Connector RJ8
Pin
Number
Signal Notes
1 Send audio
2 Return audio
3 Return audio
4 Send audio