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UDS1-BD (UDS1 Interface Circuit Pack)
Issue 1 June 2005 2381
LEDs
The LEDs on the faceplate of the TN2242 circuit pack indicate its status as described in
Table 851: TN2242 LED interpretation on page 2381
.
Interactions with Other MOs
The TN2242 MO directly interacts with these MOs:
● Synchronization on page 2381
● TN2242 Trunk Ports on page 2381
● Call Processing on page 2381
Synchronization
The DS1 facility plays a vital role in the synchronization subsystem. The IPSI or Tone-Clock
circuit pack uses either the primary or secondary timing reference, whether internal (local – IPSI
or 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 every MO associated with the
DS1facility to place its trunks (or ISDN-PRI signaling link) in an out-of-service state.
Call Processing
The busyout board command tears down every call and signaling link associated with a
TN2242 circuit pack.
Table 851: TN2242 LED interpretation
LED Meaning
Red
● MAJOR alarm
● MINOR alarm
● Firmware initialization during circuit pack insertion
Amber A port on the circuit pack is in use.
Green Maintenance testing is in progress on the circuit pack or its ports.