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 typically
causes all packet traffic in the connected EPN or Center Stage Switch to
fail. If the failure is on the packet bus interface, the packet bus may be
alarmed as well.
If an active Expansion Interface failure causes a packet bus disruption in a
Critical Reliability system (duplicated PNC), a PNC Interchange may
restore service. In other cases, replacement of the circuit pack may be
required before service 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 pack to stop functioning. If the
failure is on the circuit pack’s packet bus interface, the packet bus may be
alarmed.
■ TN577 Packet Gateway Circuit Pack
. A failure of the Packet Gateway
circuit pack disrupts communications 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 interface, the packet bus may be alarmed.
■ TN553 Packet Data Circuit Pack
. A failure of the Packet Data circuit pack
disrupts System Port traffic. If the failure is on the circuit pack’s packet bus
interface, the packet bus may also be alarmed. Applications that use
System Ports include:
— Saving and restoring announcements
— Call Detail Recording (CDR)
— Journal Printer for the Property Management System (PMS)
— Wakeup Log Printer for the Property Management System (PMS)
—System Printer
— Data Terminals
— Remote administration terminals
■ TN464F Universal DS1 Circuit Pack
. A failure of the Universal DS1
Circuit Pack disrupts ISDN-PRI signaling traffic carried on the D-channel.
The loss of that signaling may impact the pack’s 23 B-channels. If the
D-channel supports Non Facility Associated Signaling (NFAS), the
B-channels of up to 20 other DS1 circuit packs may also be affected. In
cases where all 24 channels of the circuit pack are B-channels, packet
bus related failures may not affect the B-channels, since only D-channel
signaling is carried on the packet bus. If the failure is on the circuit pack’s
packet bus interface, the packet bus may be alarmed as well.
■ TN771D Maintenance/Test. A failure of the Maintenance/Test may cause
an incorrect indication of a packet bus failure or the inability to detect such
a failure. If the failure is on the packet bus interface, the packet bus may
be alarmed as well.
