Maintenance-Object Repair Procedures
555-233-143
8-1248
Issue 1 May 2002
Duplication Impact
The Packet Interface circuit is a single point of failure in a duplex-reliability system
(with unduplicated IPSIs). If not acceptable, a S8700 Multi-Connect customer can
upgrade to a high- or critical-reliability system (with duplicated IPSIs).
shows a S8700 Multi-Connect configuration with duplicated IPSIs. The following
concepts apply only to duplicated IPSIs.
■
Packet-bus connection
In a high- or critical-reliability system (duplicated IPSIs), the standby IPSI’s
Packet Interface circuit cannot access the packet bus to write data except
during a planned IPSI interchange or when the Peer Link test (#888) is run.
Consequently, the Maintenance Loop-Around test (#886) — requiring
access to the packet bus — is not run on the standby IPSI’s Packet
Interface circuit.
■
IPSI interchange
Severe Packet Interface circuit faults causing system and application links
to go down are detected within 1 second. A fatal fault error message is
generated, and the Packet Interface maintenance software attempts to run
the Packet Interface Reset test. In a high- or critical-reliability system, this
results in a requested IPSI interchange (instead of a Packet Interface
reset) since stable calls are preserved across the interchange.
Maintenance-Object Interactions
■
Packet Bus maintenance
A Packet Interface circuit physically interacts with the PKT-BUS. So, for
certain types of Packet Interface errors, it may be difficult to isolate faults to
one or the other component. In each of these cases, Packet Interface
maintenance forwards an error report to packet-bus maintenance, where it
records a packet-bus fault in the hardware error log and runs appropriate
Packet Bus tests.
■
Packet Interface maintenance
The operation of the IPSI circuit pack’s Packet Interface circuit affects the
operation and maintenance of other circuit packs connected to the packet
bus. This includes:
1. BRI applications (BRI-PT)
2. Universal DS1 applications (UDS1) for ISDN/PRI applications
3. Expansion Interface circuit pack maintenance (EXP-INTF)
Some packet errors may require examination of the Packet Interface
circuit’s operating status. To obtain this information:
■
Examine the Error and Alarm Logs for PKT-INT entries. You must
determine which PKT-INT the link is accessing.
Содержание S8700 Series
Страница 50: ...Maintenance Architecture 555 233 143 1 26 Issue 1 May 2002 ...
Страница 74: ...Initialization and Recovery 555 233 143 3 12 Issue 1 May 2002 ...
Страница 186: ...Alarms Errors and Troubleshooting 555 233 143 4 112 Issue 1 May 2002 ...
Страница 232: ...Additional Maintenance Procedures 555 233 143 5 46 Issue 1 May 2002 ...
Страница 635: ...status psa Issue 1 May 2002 7 379 555 233 143 status psa See status tti on page 7 406 ...
Страница 722: ...Maintenance Commands 555 233 143 7 466 Issue 1 May 2002 ...
Страница 1121: ...CARR POW Carrier Power Supply Issue 1 May 2002 8 399 555 233 143 Figure 8 19 Power Distribution Unit J58890CH 1 ...
Страница 1447: ...E DIG RES TN800 reserve slot Issue 1 May 2002 8 725 555 233 143 E DIG RES TN800 reserve slot See ASAI RES ...
Страница 1735: ...LGATE AJ Issue 1 May 2002 8 1013 555 233 143 LGATE AJ See BRI SET LGATE BD See BRI BD LGATE PT See BRI PT ...
Страница 1846: ...Maintenance Object Repair Procedures 555 233 143 8 1124 Issue 1 May 2002 Figure 8 62 TN787 MMI MULTIMEDIA INTERFACE CIRCUIT PACK ...