DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-84Packet Bus Fault Isolation and Repair
5
■TN570 Expansion Interface. A failure of the Expansion Interface typic ally
causes all packet traffic in the connected EPN or Center Stage Switch to
fail. If the failure is on the packet b us interface, the packet b us may be
alarmed as well.
If an active Expansion Interface failure c auses a packet bus disru ption in a
Critical Reliability system (dup licated PNC), a PNC Interchange may
restore service. In other cases, replac ement of the circuit pac k may be
required before servic e is restored.
■TN556 ISDN-BRI Circuit Pack. A failure of the ISDN-BRI circuit pack
typically causes some or all ISDN-BRI sets and data modules and/or an
ASAI adjunct connected to the circuit pac k to stop functioning. If the
failure is on the circuit pac k’s packet bus interfac e, the packet bus may b e
alarmed.
■TN577 Packet Gateway Circuit Pack. A failure of the Packet Gateway
circuit pack d isrupts communicatio ns with the adjunct (for example,
Audix, DCS) connected to the far end of the X.25 link. If the failure is on the
circuit pack’s packet bus interfac e, the packet bus may b e alarmed.
■TN553 Packet Data Circuit Pack. A failure of the Packet Data circuit pack
disrupts System Port traffic. If the failure is on the circ uit pack’s packet b us
interface, the packet b us may also be alarmed. Ap plications that use
System Ports include:
— Saving and restoring announcements
— Call Detail Recording (CDR)
— Journ al Printer for the Property Management System (PMS)
— Wakeup Log Printer for the Property Management System (PMS)
—System Printer
— Data Terminals
— Remote adm inistration terminals
■TN464F Universal DS1 Circuit Pack. A failure of the Universal DS1
Circuit Pack disrupts ISDN-PRI signaling traffic c arried on the D-channel.
The loss of that signaling may impac t the pack’s 23 B-channel s. If the
D-channel support s Non Facility Associated Signaling (NFAS), the
B-channels of up to 20 other DS1 circ uit packs may also be affec ted. In
cases where all 24 channels of the c ircuit pack are B-channels , packet
bus related failures may not affect the B-c hannels, since only D-channel
signaling is carried on the packet bus. If the failure is on the circ uit pack’s
packet bus interfa ce, the packet bus may be alarmed as well.
■TN771D Maintenance/Test. A failure of the Maintenance/Test may cause
an incorrect indic ation of a packet bus failure or the inab ility to detect such
a failure. If the failure is on the packet b us interface, the packet b us may
be alarmed as well.