Specifications
Chapter 3 Testing & Diagnostics
3-8
TROUBLESHOOTING AN ACCESS BANK
Problem Indication Corrective Action
No LED's Lit on the Access Bank. Status LED
off.
The Access Bank has no power.
1. Check all Power connections.
2. The AB-115 Power converter cube may have tripped its
circuit breaker. Reset it.
4. A power source greater than -70 Vdc is or has been
connected to the Access Bank. There are no power fuses
internal to the Access Bank. Remove power at the Access
Bank -48V/+RET connector to automatically reset internal
solid-state protection devices. These devices will only
interrupt operation (for safety reasons) if an excessive
voltage has been applied continuously to the -48V/RET
input to the Access Bank. Check supply voltages and
wiring between the power supply and the Access Bank with
a volt meter to isolate problems.
4. There may be no power to the outlet to which the AB-
115 Power is plugged into. Check supply voltages with a
voltmeter to be sure the proper power is available.
5. The power supply has failed, replace power supply.
The Status LED is RED 1. The Access Bank controller card has failed internally.
Contact CAC.
The Status LED is YELLOW The Access Bank is in a Trunk Processing state.
1. A Yellow Status indication may also have been set by
the Network Loopback test switch on the front of the
Access Bank being turned on, which causes the Channel
Cards to be held in the Trunk Processing state. (all voice
channels are suspended). Turn Network Loopback switch
to Normal
2. The T1 signal received from the network is in one of the
following alarm conditions: Loss of Signal, AIS (unframed
all ones received), or Yellow Alarm received. Call your
carrier.
The Status LED is Flashing The Alarm Cut-Off Switch is in the
Alarm Cut-Off position. Turn the Switch to the Normal
position to return to a solid color indication.
The Test LED is Green Self Test Switch is Activated, T1 Self Test Passed: T1
Signal Received, In Frame (ESF or SF as configured),
Proper Line Code Received, no ESF or BPV errors
received.
1. Return Self Test Switch to Normal position