User Manual

Troubleshooting: C–CCP Backplane – continued
6-18 1X SC4812T–MC BTS Optimization/ATP 5/21/04
DRAFT
No DC Input Voltage to Power Supply Module
Table 6-22: No DC Input Voltage to Power Supply Module
Step Action
1 Verify DC power is applied to the BTS frame.
2 Verify there are no breakers tripped.
* IMPORTANT
If a breaker has tripped, remove all modules from the applicable shelf supplied by the breaker and
attempt to reset it.
– If the breaker trips again, there is probably a cable or breaker problem within the frame.
– If the breaker does not trip, there is probably a defective module or sub–assembly within the shelf.
3 Verify that the C–CCP shelf breaker on the BTS frame breaker panel is functional.
4 Use a voltmeter to determine if the input voltage is being routed to the C–CCP backplane by
measuring the DC voltage level on the PWR_IN cable.
– If the voltage is not present, there is probably a cable or breaker problem within the frame.
– If the voltage is present at the connector, reconnect and measure the level at the “VCC” power
feed clip on the distribution backplane.
– If the voltage is correct at the power clip, inspect the clip for damage.
5 –48 V configuration only – If everything appears to be correct, visually inspect the power supply
module and verify LEDs are green.
6 –48 V configuration only – If LED is red, then replace the power suppy module with a known good
module and verify LEDs are green.
7 If steps 1 through 5 fail to indicate a problem, a C–CCP backplane failure (possibly an open trace) has
occurred.
No DC Voltage (+5, +6.5, or +15 Volts) to a Specific GLI, BBX,
or Switchboard
Perform the procedure in Table 6-23 to troubleshoot a DC input voltage
to GLI, BBX, or Switchboard failure.
Table 6-23: No DC Input Voltage to any C–CCP Shelf Module
Step Action
1 Verify the steps in Table 6-22 have been performed.
2 Inspect the defective board/module (both board and backplane) connector for damage.
3 Replace suspect board/module with known good board/module.
TX and RX Signal Routing
Problems
Perform the procedure in Table 6-24 to troubleshoot TX and RX signal
routing problems.
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