Octel XC1000, Service Manual

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COMPONENT DESCRIPTIONS
10-24 Edition One XC1000 Service
Refer to section 6.3 for procedures if a red alarm is seen on the
PTIC front edge. The cable connections and wiring between the
switch-terminating equipment and XC1000 must be checked. If
the problem remains, call the Octel Communications Technical
Assistance Center.
Yellow Alarms. The yellow alarm LED is the PTIC ALARMS LED
on the left. labeled
Y
. This alarm indicates that the switch (or
other remote device) detected a communication error from
XC1000. All cable connections and wiring between the switch-
terminating equipment and XC1000 must be checked. If the
problem remains, call the Octel Communications Technical
Assistance Center.
Diagnostic Jacks. The three jacks below the alarm LEDs, are used for
diagnosing the PTIC, the switch, and XC1000. These diagnostic jacks
are the same as on the E1 TIC.
Normal Operation LEDs. The L9 through L2 and the PWR LEDs are
the same as on the CPU.
Figure 10-14 shows the LEDs and the test jacks on the front edge of the PTIC.
10.4 POWER SUPPLIES
The XC1000 is a –48 Vdc system, entering the XC1000 at the power-distribu-
tion shelf, which is located toward the top of the cabinet, above the main
backplane and below the auxiliary shelf. A terminal block with two compres-
sion-ring lugs is located on the power-distribution shelf and accepts 2-AWG
cable from the customer-provided power source.
The power source must be capable of delivering up to 30 amperes of –48
Vdc per cabinet. If non-hot-plu5-Vdc and +12-Vdc power supplies
are installed, the customer-provided power source must maintain a
minimum of –42.5 Vdc while supplying XC1000 with an inrush current of
1,000 amperes for a period of up to 50 ms.
The main system circuit breaker is located at the front of the power-distribution
shelf. This circuit breaker trips during overcurrent or red temperature condi-
tions. Tripping the circuit breaker prevents damage to the XC1000. The
XC1000 cannot reboot with a tripped circuit breaker.
Three additional circuit breakers are provided for the +5-Vdc, +12-Vdc, and
–48 Vdc power subsystems. These breakers are located behind the circuit
breaker panel on the front of the XC1000, on the power-distribution shelf.
These circuit breakers can also trip during overcurrent or red temperature
conditions.
The input-power capacitor located on the power-
distribution shelf stores a hazardous charge. Wait 5
minutes for the capacitor to discharge before touching it.
Warning!
SECTION 10.3 – 10.4