Nortel DMS-100 Series Maintenance Manual page 213

Scan points are used to detect alarm conditions such as loss of loop, ground,
or battery. Distribution points report alarm conditions audibly (bells) or
visually (lights).
Each SD point consists of two wires that can be normally open or closed.
When the SD point is set, it closes or opens the loop (depending on what the
normal state is). The external equipment detects either the open or shorted
circuit. Operating company personnel determine what the normal state is by
defining the state in the software alarm tables.
The type of distribution point is a two-contacts type. The SC and SD points
are testable. If the SC or SD points are faulty, the UMP fails diagnostics tests.
The following table lists the SC and SD point alarms.
Table 7-8 Scan point alarms
Scan point Definition
0 Major alarm
1 Fuse failure, power is below 41 V, or an
absence of ABS voltage
2 Critical alarm
3 At least one of the talk battery breakers is
open
4 NTTR74AA Alarm card missing
5-16 User defined
Note: The SuperNode switch detects each scan point as a separate entity so
the switch can differentiate between remote alarms.
Table 7-9 Distribution point alarms (Sheet 1 of 2)
Distribution
point Definition
0 Critical lamp and main distribution frame
(MDF)
1 Major lamp and MDF
Note: The minor alarm is not connected to the MDF since minor alarms are not
connected to the maintenance center.
Star Remote System manual maintenance 7-9
DMS-100 Family NA100 Star Remote System XPM15 and up
Location
RCP
RCP
RCP
RCP
RCP
UMP
Location
RCP
RCP