CXR Larus 80-100-400
Issue 1, July 2006
__________________________________________________________
_________________________________________________
page
4-4
4.23
Alarm Cutoff on 54560 Alarm Interface Card
4.2310 In the event of a Major or Minor alarm, the audible alarm relay contacts which
connect to TB1 on the backplane can be disabled. Refer to Section 5, Figure
5-1.
4.2311 Depress the ACO pushbutton to disable the audible alarm.
NOTE:
The yellow ACO LED will turn on but the visual alarm contacts and the LEDs will not be
affected. When the alarm state is retired, the ACO LED will turn off and the audible
alarm relays will be reset to respond to the next alarm.
4.24
Selection of DS1/E1 Input for 54541/54542 Synchronization
Monitor Card
4.2410 When a 54541 or 54542 card is installed, the unit will power up with its default
settings as follows:
54541: Input type = T1
Framing
=
SF
Line
Code
=
AMI
54542: Input type = E1
CRC
disabled
Framing
=
CCS
If a 54512-3 input card is installed in your system, you will need to set the input
type to 2.048 MHz square wave. Refer to Volume 3 for the TL1/ITL1 command
set or Volume 4 for the menu interface.
4.2411 The 54541/54542 powers up in a default mode, scanning all equipped inputs
for 100 seconds each. This will show on the seven segment display.
4.2412 In this scan or default mode, press the MON SELECT pushbutton once to
advance the unit to the next equipped input.
4.2413 The seven segment display on the 54541/54542 card briefly shows which of the
five inputs (two input references, three external inputs) is being monitored when
the input is changed. Otherwise the indicator shows any bit slip between the A
and B track and hold card outputs. The slip indicator rotates clockwise or
counterclockwise only if the input references are different in frequency or if one
of the clocks has a fault. The front panel MON INPUT jack allows the DS1/E1
#5 input signal to be received via front panel access.
4.2414 Observe the front panel LEDs for any error or performance thresholds which
have been exceeded for the input currently being scanned.
NOTE:
The threshold values for the 54541/54542 LEDs are shown in Table 4-A at the end of
this section. Some of these thresholds can be changed through an external terminal, as
