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 Interface 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 circuit pack. If the Expansion Interface
circuit pack should cycle between sane and insane several times, the
Maintenance circuit pack will hold the Expansion Interface circuit pack
reset. If a new Expansion Interface circuit pack is installed in the EPN, and
the red LED remains lit, the EPN Maintenance circuit pack should be
removed because it may be holding the new Expansion Interface circuit
pack reset. This condition could present itself if there is a link problem to
the EPN, and the EPN experiences several EPN restarts. The Maintenance
circuit pack may be reinstalled after the Expansion Interface circuit pack
has been physically inserted and the Expansion Interface circuit pack’s red
LED has gone off.
The link between two Active Expansion Interface circuit packs or between an
Active Expansion Interface circuit pack and an Active Switch Node Interface
circuit pack is involved in synchronization. The Expansion Interface circuit pack
reports slip errors if synchronization is not operating properly. When diagnosing
synchronization problems, the Expansion Interface circuit packs should be
examined as a possible cause.
Expansion Interface LEDs
The Expansion Interface circuit pack has the standard red, green, and yellow
LEDs. The red and green LEDs have the traditional uses: red means some alarm
condition and green indicates maintenance testing in progress. The yellow LED
is used to provide useful visual status information. The state of the yellow LED is
very important when executing the Expansion Interface Manual Loopback
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 active and which
is standby, use the
status port-network
and
status PNC
commands.
Alternately, visual inspection will show that the active EI circuit packs will have
their yellow LED on solid (for an inter-EPN EI in a direct connect system) or blink
a pattern of 2 seconds on and 200 ms off. The standby PNC EI circuit packs will
have their yellow LED s off. See Table 9-305
for the possible EI yellow LED states.
