8
Section 61180008L1-5, Issue 2
61180008L1-5B
Alarm Processing
The SCU monitors the status of each line card and
provides necessary alarm processing to determine the
overall alarm state of the system.
Alarm Outputs
The SCU determines alarm states and reports these
results via onboard alarm interfaces and through
active user access channels. Each onboard alarm
interface consists of Form-C relay contacts to provide
Common (COM), Normally Open (NO), and
Normally Closed (NC) functionality. Physical access
to the relay contacts is attained by way of wire-wrap
posts per alarm function. These posts are located on
the rear panel of the Total Access 1500 shelf. The
following alarm outputs are supported:
Alarm
Wire-wrap Header
• Major Audible
MAJ-A
• Minor Audible
MIN-A
• Major Visual
MAJ-V
• Minor Visual
MIN-V
The SCU provides front panel LEDs (See Table 2) to
indicate the status of the shelf and Alarm Cut Off
(ACO) state.
Alarm Inputs
The SCU supports external alarm, status, or control
inputs. Circuitry on the SCU accepts a -48V signal as
an active state. Physical access to these inputs is
attained by way of two wire-wrap posts per input
function located on the rear panel of the Total Access
1500 shelf. The following alarm inputs are supported:
Alarm
Wire-wrap Header
• Auxiliary 1
AUX 1
• Auxiliary 2
AUX 2
• Alarm Cut Off
AUX 3
• Remote
AUX 4
NOTE
The front panel mounted ACO switch is used to
cut off an alarm.
Configuring Alarms
To configure alarms the user will need to perform the
following:
1. Logon to the system.
2. From the Total Access 1500 main menu, select
option 1, System Controller, and press ENTER.
3. From the System Controller menu, select option
4, Alarms, and press ENTER.
4. Provision the alarms as desired.
The following items may be configured:
• Alarm Relay Mapping – allows the user to select
T1 or D4 alarm relay mapping
• Log MLT Alarms – enables/disables the logging
of MLT alarms
• Ringer Alarms – enables/disables ringer alarms
• AUX1 Alarm – enables/disables AUX1 alarm
input
• AUX2 Alarm – enables/disables AUX2 alarm
input
• RMT Alarm – enables/disables RMT alarm input
• Primary Power Alarm – enables/disables alarm
condition associated with having primary power
feed removed
• Secondary Power Alarm – enables/disables alarm
condition associated with having secondary
power feed removed
• PSU Configuration – choose single or dual PSU
according to whether redundant equipment is
installed in the Total Access 1500 chassis
• LIU Configuration – choose single or dual LIU
according to whether redundant equipment is
installed in the Total Access 1500 chassis
