Specifications

Chapter 3 Testing & Diagnostics
3-3
NORMAL / REMOTE SWITCH (AB-24)
This switch, in the third position down on the Access Bank front panel, is used for selecting usage of the
Access Bank Remote Monitoring board. This switch should remain in the Normal position when the
usage of the ABRM is not desired, or when the channel bank is not equipped with the ABRM. When the
switch is in the Remote position, you can utilize the remote dial-up capability of the ABRM.
ALARM CUT OFF
The alarm relay output contacts on the Power/Alarm connector are held in a normally-open condition
when this switch is turned to the Alarm Cut-Off position. This allows users to turn-off alarm buzzers or
auto-dial devices that may be connected to the Access Bank (Tip and Ring Pair 25) after a problem has
been reported. Turning this switch on (to Alarm Cut-Off Position) will cause the Status LED to flash at
one second intervals until the Alarm Cut Off Switch is turned back to the Normal position. When the
Normal/Remote switch is in the Remote position the Alarm Cut-Off switch is NOT active.
LIU LED INDICATORS
Complete visual indication of the network and equipment conditions are available with 4
red/green LEDs on the front of the Access Bank
TM
.
Test LED
Green: Self Test Switch 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.
Yellow: The Access Bank is in Network Loopback - sending the received T1 signal
back toward the line. This may be due to either an in-band five-bit loopback
code of 10000 received from the T1 line (cycling the Self Test switch to the
Self Test position and back to the Normal position will reset this loopback) or
the Network Loopback Switch in the Network Loopback position at the front
of the Access Bank (return this switch to the Normal position).
Red: Self Test Switch Activated, T1 Self Test Failed due to one or more of:
T1 Loss of Signal, Out of Frame, Improper Line Code Received, ESF or BPV
errors received.
Off: The Self Test Switch is in the Normal position and the Access Bank is
in a normal operating mode.
Status LED
Green: Access Bank Power and LIU Card functions are O.K.
Flashing (any color):
The Alarm Cut-Off Switch is in the Alarm Cut-Off position. Turn the back to
Normal to return to a solid green indication.