Chapter 3. Installation
60
Power and Alarms
Power and alarm contacts are connected with 18-gauge wire, which should be cut to fit. Wire the
multiplexer before installing power supplies or other equipment in the shelf. If equipment arrives with the
common equipment units and line cards already installed, remove the power supply units and T1
Interface units (Dual DSX-1 Interface or Dual CSU Interface) before installing the shelf.
Warning!
Failure to follow safety precautions noted above could result in damage to the equipment,
or injury to the installer.
Talk Battery
Talk battery supplies DC voltage for telephone operation. Foreign Exchange Subscriber (FXS)
cards, and Smart Omni-Orderwire Station cards require talk battery. Connect the talk battery
terminal (TB) on the terminal block (TB1) to an outboard talk battery power supply, or use the DC
power connection on the back of the shelf to supply the talk battery. To do this, connect the DC
power input terminal, labeled BATT, to the talk battery terminal with 18-gauge wire. On some D/I
Mux III models the DC power input terminal is labeled -48 V or BATT.
On shelves shipped after 1993 there is a jumper connecting the talk battery terminal to the DC
power source. This connection can be broken by setting the talk battery strap located on the
back panel to the OUT position.
Note: If using an external talk battery source, ensure that the talk battery strap is set to the
OUT position.
DC Power
Ideally, power should be turned off to the D/I Mux III system before wiring. With a battery
powered system this may not be possible.
If connecting live (hot) power, be certain the D/I Mux III system power supply and T1 Interface
units are removed to prevent current from flowing when connecting to power.
CAUTION!
If connecting hot power, be certain to connect to the D/I Mux III system first and then to the DC
power source. This minimizes the possibility of a hot wire becoming grounded. Coastcom does
not recommend connecting live or hot power.
Use the following procedure for connecting DC power.
1. Remove the power supply units and Dual DSX-1 Interface or Dual CSU Interface Unit, if
already installed.
2. The D/I Mux III has a positive ground. Connect the DC power source ground to the D/I Mux
III positive terminal, labeled GND. On some D/I Mux III models, the positive terminal is
labeled IN+.
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