DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-984MAINT (EPN Maintenance Circuit Pack)
9
The EPN Maintenance circuit pack must be physically inserted into the
dedicated slot marked Maintenance in the A carrier of the EPN. The serial links
from the EPN Maintenance circuit pack to the Expansion Interface circuit packs
are physically connected from this dedicated slot to slots 2A01 and 2B02 (2B02
is used only if there is duplicated Port Network Connectivity). The serial link from
slot 2A01 to the maintenance slot is hard-wired into the backplane of carrier A,
whereas the serial link from slot 2B02 to the maintenance slot is a ribbon cable
connecting the two slots. The serial link from the EPN Maintenance circuit pack to
the terminal is also a ribbon cable which plugs into a connector labeled TERM on
the back of carrier A.
The maintenance strategy for the EPN Maintenance circuit pack consists of
checking the integrity of the communications path to/from the EPN Maintenance
circuit pack, testing individual hardware components on the EPN Maintenance
circuit pack, and keeping the alarm LED s up-to-date. The individual hardware
components include the serial interfaces which handle the serial links connected
to the EPN Maintenance circuit pack. There are three serial interfaces, one for
each possible Expansion Interface circuit pack and one for the terminal.
Since the EPN Maintenance circuit pack supports environmental maintenance in
the EPN, trouble with the EPN Maintenance circuit pack can cause environmental
maintenance to falsely detect problems. In a multicarrier cabinet EPN, these
environmental MOs include: POWER (Battery & Battery Charger), CARR-POW
(Carrier Port Power Unit), AC-POWER (AC Power), CABINET (Cabinet Sensors),
EMG-XFER (Emergency Transfer), EXT-DEV (External Device Alarm), and
CUST-ALM (Customer-Provided Alarming Device). In a single carrier cabinet
EPN, these environmental MOs include DC-POWER (Single Carrier Cabinet
Power), EMG-XFER (Emergency Transfer), EXT-DEV (External Device Alarm),
and CUST-ALM (Customer-Provided Alarming Device).
