Maintenance Object Repair Procedures
555-233-123
10-1836 Issue 4 May 2002
LEDs
The LEDs on the faceplate of the TN2242 circuit pack indicate its status as
described in Table 10-666.
Interactions with other MOs
The TN2242 maintenance object directly interacts with these maintenance
objects:
■ ‘‘Synchronization’’
■ ‘‘TN2242 trunk ports’’
■ ‘‘Call processing’’
Synchronization
The DS1 facility plays a vital role in the synchronization subsystem. The
Tone/Clock circuit pack uses either the primary or secondary timing reference,
whether internal (local -- Tone/Clock circuit pack) or external. TN2242 circuit
packs can be administered as “primary” or “secondary” synchronization
references.
The TN2242 circuit pack sends DS1 link status information to the synchronization
reference switching algorithm. This algorithm determines whether timing
references should be switched due to failure or restore conditions.
TN2242 trunk ports
The TN2242 circuit pack MO is responsible for monitoring the health of the DS1
facility. If a DS1 facility goes down, then that facility’s DS1 circuit pack instructs all
DS1 port MOs associated with the facility to place their trunks (or ISDN-PRI
signaling link) in an out-of-service state.
Call processing
The busyout board command tears down all calls and signaling links associated
with a TN2242 circuit pack.
Table 10-666. TN2242 LED interpretation
LED Meaning
Red
■ MAJOR alarm
■ MINOR alarm
■ Firmware initialization during circuit pack insertion
Yellow A port on the circuit pack is in use.
Green Maintenance testing is in progress on the circuit pack or its ports.
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