Nortel DMS-100 Series Maintenance Manual page 209

Table 7-3 Star Hub component failure and general recovery methods (Sheet 2 of 2)
Hub component failure
C-side speech links
Removing main power
converter in slot 3 or 20
Secondary converter in
slot 5 or 18
Ringing generator
failure
UMP card failure
Star Hub power converter impact on alarms
The followIng table identifies the alarms visible at the MAP terminal for a Star
Hub with two power converters. The alarms raised are based on the states of
the power converters.
Table 7-4 Power converter half configuration (Sheet 1 of 2)
Power
convertor in
slot 3
Installed
Not installed
Installed
Failed
Star Hub response and general recovery methods
Calls on the affected links drop and the C-side capacity is reduced, if the
reason is a C-side link failure.
One unit drops activity and the second unit takes over control of C-side
links, line drawers, and UMPs. Note that even though the Star Hub has
up to two power converters in each unit, removing one of the main power
converters causes the whole unit to drop.
The unit would drop activity if there is at least one drawer in the range of
10-18.
Traffic is routed through the second ringing generator which limits the
number of calls that can ring simultaneously to 30 in each ringing phase
(there are four ringing phases). No service is provided in emergency
stand-alone (ESA) mode.
Note: If automatic number identification (ANI) or coin services are
required, a ringing generator failure causes the entire unit to drop activity.
If one UMP card fails, the second UMP card takes over control of all lines
giving service to all lines. This limits the number of simultaneous lines that
can be treated to one instead of two.
If only one UMP card is provisioned, no lines can be tested and SC and
SD points will fail. In addition, no call processing is supported while the
STAR is in ESA mode.
Power
converter in
slot 20
Installed
Installed
Not installed
Failed
DMS-100 Family NA100 Star Remote System XPM15 and up
Star Remote System manual maintenance 7-5
Unit 0 Unit 1
InSv InSv
SysB InSv
InSv SysB
SysB SysB
Alarms
None
Critical
Critical
Critical