Lucent Technologies Release 7 User Manual
DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Architecture
1-16
SPE Duplication
1
SPE Duplication
The Switch Processing Element (SPE) consists of the following circuit packs.
These circuit packs reside on the A carrier (control carrier) of the PPN in all
systems, except for the UN330B which is found only in high and critical reliability
systems. In high and critical reliability systems, the PPN B carrier duplicates
exactly the configuration of the A carrier, making two identical SPE complexes.
This duplication allows the system to recover from many faults, and enables
troubleshooting and repairing of SPE components without interrupting service.
systems, except for the UN330B which is found only in high and critical reliability
systems. In high and critical reliability systems, the PPN B carrier duplicates
exactly the configuration of the A carrier, making two identical SPE complexes.
This duplication allows the system to recover from many faults, and enables
troubleshooting and repairing of SPE components without interrupting service.
The Tone-Clock circuit pack also resides on the control carrier, and is also
duplicated. However, it is not considered a part of the SPE. Although the
SPE-Select switches control Tone-Clock selection, its duplication strategy differs
from that of the SPE. See the
duplicated. However, it is not considered a part of the SPE. Although the
SPE-Select switches control Tone-Clock selection, its duplication strategy differs
from that of the SPE. See the
‘‘TDM-CLK (TDM Bus Clock)’’
(Tone-Clock Circuit Pack)’’
sections in
Chapter 9, ‘‘Maintenance Object Repair
Procedures’’
for details.
Duplicated SPEs employ an active/standby strategy. At any one time, one SPE, A
or B, is designated active and controls the switch services network. The other
SPE, designated standby, is not required for switch service but remains ready to
become active and resume control of service should a service-affecting failure
occur in the active SPE. This action is termed an SPE interchange. It is important
that the standby SPE be kept as available as possible to allow for a rapid
interchange.
or B, is designated active and controls the switch services network. The other
SPE, designated standby, is not required for switch service but remains ready to
become active and resume control of service should a service-affecting failure
occur in the active SPE. This action is termed an SPE interchange. It is important
that the standby SPE be kept as available as possible to allow for a rapid
interchange.
Table 1-4.
SPE Circuit Packs and Maintenance Objects
Apparatus
Code
Circuit Pack Name
Associated
Maintenance Objects
TN1648
System Access and
Maintenance
Maintenance
SYSAM
UN330B
Duplication Interface
DUPINT,
DUP-CHL
DUP-CHL
UN331B
Processor
PROCR
TN1650B
Memory
MEM-BD
TN1655
Packet
PKT-INT
UN332
Mass Storage System/
Network Control (MSSNET)
Network Control (MSSNET)
H-ADAPTR,
SW-CTL
SW-CTL
TN1657
Disk Drive
DISK
TN1656
Tape Drive
TAPE
STBY-SPE
STO-DATA
STBY-SPE
STO-DATA