DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-790EXP-INTF (Expansion Interface Circuit Pack)
9
e. This is the normal state for a Standby Expansion Interfac e circuit pack in
both the PPN and EPNs.
NOTE:
In an EPN the TN775C EPN Maintenance (MAINT) circuit pack monitors the
sanity of the Expansion Interface circ uit pack. If the Expansion Interfac e
circuit pack should cycle b etween sane and insane several times, the
Maintenance circuit p ack will hold the Expansion Interfac e circuit pac k
reset. If a new Expansion Interface circ uit pack is installed in the EPN, and
the red LED remains lit, the EPN Maintenance circuit pac k should be
removed because it may b e holding the new Expansion Interfa ce circuit
pack reset. This condition c ould present itself if there is a link p roblem to
the EPN, and the EPN experiences several EPN restarts. The Maintenance
circuit pack ma y be reinstalled after the Expansion Interfac e circuit pac k
has been physically inserte d and the Expansion Interface c ircuit pack’s red
LED has gone off.
The link between two Active Expansion Interfac e circuit pack s or between an
Active Expansion Interface c ircuit pack and an Active Switch Node Interfac e
circuit pack is involved in synchronization. The Expansion Interfa ce circuit pac k
reports slip errors if synchronizatio n is not operating prope rly. When diagnosing
synchronization problems, the Expans ion Interface circuit p acks should be
examined as a possible c ause.
Expansion Interface LEDs
The Expansion Interface circuit p ack has the standard red , green, and yellow
LEDs. The red and green LEDs have the traditional uses: red means s ome alarm
condition and green indicates maintenance testing in progress. The yellow LED
is used to provide useful visual s tatus information. The state of the yellow LED is
very important when executing the Expansion Interface Manual Loop back
Procedure. The possible yellow LED states are shown in Table 9-305.
Upon power-up, the red and green LEDs turn on and off. The yellow LED goes to
its appropriate state.
To determine which PNC (and which EI(s) in a port network) is ac tive and which
is standby, use the status port-network and status PNC command s.
Alternately, visual inspection will show that the ac tive EI circuit packs will have
their yellow LED on solid (for an inter-EPN EI in a direct connec t system) or blink
a pattern of 2 second s on and 200 ms off. The standby PNC EI circuit p acks will
have their yellow LED s off. See T able 9-305 for the possible EI yellow LED states.