Specifications

4-10 Peripheral Cards and Components
Chapter 4 - Maintenance and Troubleshooting
XTS-IP - Installation Manual December 2005
The Power Supply Unit (PSU) provides direct current power to the system in the form of
+30VDC, +5VDC, and -5VDC. LEDs on the PSU in each cabinet show presence of each voltage
type. Each PSU provides connections for batteries and charging current for batteries (optional).
The Miscellaneous Interface Board (MISB)
provides external paging, external contact control, music
on hold and background music inputs.
The DTRU and DTRU4 provides dual tone multi frequency tones associated with dialing
functions.
Table 4-10: Power Supply Unit (PSU)
Problem Possible Solutions
System does not operate (Loss of
+5VDC) …
 Check LEDs on PSU.
 Check power switch.
Analog phones and CO Line do not
operate (Loss of -5VDC) …
 Check LEDs on PSU.
 Check power switch.
Battery Back-up for system not
working …
Check to ensure BATT SW is on.
Table 4-11: Miscellaneous Interface Board (MISB)
Problem Possible Solutions
The external paging port does not
work …
 Check programming.
 Check wiring.
Some or none of the 4/6 external
control contacts do not operate …
 Check programming.
 Check RAU.
Music on hold is not heard … Check music source on MISB and volume
control on music source.
Background music is not heard …
Table 4-12: DTMF Receiver Unit (DTRU/DTRU4)
Problem Possible Solutions
DTMF Single Line Telephones can
not dial out …
 If SLT has dial tone, check for installation
of DTRU.
 If large volume of calls in the system, you
may need to add additional DTRUs.
DISA calls can’t dial system
resources after call connection …
Check DISA programming.
DID lines won’t ring intended
station(s) …
Check DID programming.