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Select the power supply configuration
Power source
The M5317TX is powered using one of the following power sources:
•
phantom power (PS1) conducted over the T line card or the NT1
•
auxiliary dc power (PS2) conducted over a third pair in the line
cord (can be provided independently of the NT1 or line card)
•
local dc power (PS2) conducted over a third pair from a power
pack
Restricted powering
You can designate one telephone on the loop to operate in the event of a
power failure. When power fails, the NT1 or line card reverses the
polarity of the power output to the "designated" telephone and use at a
reduced power can continue. Note that only one telephone on the loop
can be designated for restricted powering-check your service order or
ask the System Administrator to see whether the telephone should be
designated for restricted powering.
Set the power switches
13. Pry open the power switch hatch underneath the set using a 3/16
inch (5mm) screwdriver.
14. Use the Power Alternatives Table shown below to set the power
switches.
Power source and designation
Phantom Supply PS1-non-designated
Phantom Supply PS1-designated
Remote Third Pair Supply PS2-non-designated
Remote Third Pair Supply PS2-designated
Local Third Pair supply PS2
15. Close the power switch hatch.
Preparing to install the M5317TX
M5317TX and CustomNet Installation Guide
17
V
-
1
+/-
1
-
2
+/-
2
- or +/-
2
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