DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-983MAINT (EPN Maintenance Circuit Pack)
9
9
MAINT (EPN Maintenance Circuit
Pack)
The TN775B EPN Maintenance circuit pack monitors and supports environmental
maintenance for EPN multicarrier or single-carrier cabinets. The EPN
Maintenance circuit pack provides switch software with a mechanism to activate
or deactivate Emergency Transfer in the EPN. Control by the system of
Emergency Transfer can be overridden by the Emergency Transfer Switch on the
faceplate of the circuit pack. The EPN Maintenance circuit pack invokes
Emergency Transfer when the EPN loses contact with the PPN or when the EPN
Maintenance circuit pack loses contact with all Expansion Interface circuit packs.
The EPN Maintenance circuit pack handles loss of AC power in the EPN
multicarrier cabinet by supplying battery power for 15 seconds to the EPN
cabinet and then an additional 10 minutes of power to just the control carrier in
the EPN. When power fails in a single-carrier EPN cabinet, no such power
holdover is available. In the event that an Expansion Interface circuit pack goes
insane and is reset six times within 15 minutes, the EPN Maintenance circuit pack
will hold the Expansion Links reset preventing the Expansion Interface circuit
pack from running.
The EPN Maintenance circuit pack has alarm LED s which indicate the presence
of Major, Minor, and Warning alarms. A flashing LED indicates the presence of
an alarm within the cabinet. A continuously lit LED indicates the presence of an
alarm elsewhere in the system.
A management terminal (G3-MT) can be directly connected to the TN775B EPN
Maintenance circuit pack. This link operates at 9600 baud, but system software
throttles the rate of data flow to the TN775B for display on the G3-MT to about
1200 baud. All system commands can be executed via the EPN G3-MT login.
However, due to the slow speed at which the EPN login operates, it is
recommended that it be used only for maintenance sessions and not for system
administration.
The PPN communicates with the EPN Maintenance circuit pack via the following
path; uplink messages from the EPN Maintenance circuit pack to the PPN take
exactly the reverse path. Messages flow from the UN331B Processor circuit pack
in the SPE to the TN1655 Packet Interface circuit pack, over the Lan Bus to the
Active PPN Expansion Interface circuit pack, across the fiber link to the Active
EPN Expansion Interface circuit pack, and over a serial link to the EPN
Maintenance circuit pack.
MO Name (in
Alarm Log)
Alarm
Level
Initial Command to
Run Full Name of MO
MAINT MINOR test maintenance sh EPN Maintenance Circuit Pack
MAINT MAJOR test maintenance l EPN Maintenance Circuit Pack
