Appendix B
Installing Pro9 system using existing cabling to connect the base station to the DTM located in
the building (Q-P9JB x2)
Using the junction boxes allows existing cabling to be used to carry the audio signals for the speaker
and microphone. Inside each is a small PCB with two sets of screw terminals, A and B as shown. Follow
the steps below to make the correct connections.
1. First, cut the cables on both the speaker and the microphone. Both have fixed cables, factory
terminated with specialist connectors.
2. Strip the cable of all 4 ends and prepare the cores for connection.
3. In the order point connect the microphone and speaker into the connection strip of the junction
box as shown following the colour codes.
4. Connect your existing audio cable to section B of the PCB as shown.
5. Then go to the other end of the audio cable in the building and use the other junction box to
attach the speaker and microphone plugs to it.
page 11
A
B
A
B
Terminal connection Connector A
Installed cable type
Spkr +ve
Spkr -ve
Spkr scrn
Mic +ve
Mic -ve
Mic scrn Notes
Quail speaker & mic
red
black
screen
white
blue
screen
Supplied installation
options
Terminal connection Connector B
Installed cable type
Spkr +ve
Spkr -ve
Spkr scrn
Mic +ve
Mic -ve
Mic scrn Notes
4 core overall screened
22A WG with drain
red
black
nc
white
green
scm
(drain)
As used in many DT
installations
Specialist DT cable 3 pair
individually screened
red
black
nc
white
blue
scm
Specialised cable
designed for DT
Multi pair screened cable
22A WG (use two pairs)
red (pr1)
black
(pr1)
scm (pr2)
white
(pr2)
black
(pr2)
scm (pr2)
General purpose cable
suitable for DT
Figure 15 - Connecting using existing cabling to DTM in building
