DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Architecture
1-24SPE Duplication
1
Locking the Active SPE
Duplication Interface hardware supports the ability to lock the active SPE in
active mode by means of the SPE-Select switches. The procedure for safely
doing this is described in
Chapter 5, ‘‘Alarms, Errors, and Troubleshooting’’
, and
in
‘‘STBY-SPE (Standby SPE Maintenance)’’
in
Chapter 9, ‘‘Maintenance Object
Repair Procedures’’. In locked mode, the system operates as if it is simplex:
■ The standby SPE is inaccessible to the active SPE and active G3-MT
login.
■ No SPE-interchange is possible.
■ Handshake is down and memory shadowing is off.
The locked state is intended for temporary use to prevent interchanges during
maintenance sessions. No alarm is raised when the switches are locked.
However, alarms against SPE-SELE are raised later if the switches are left out of
the AUTO position for an extended length of time.
Memory Shadowing
Memory shadowing is used to keep the standby SPE’s memory content
up-to-date relative to the active SPE’s memory. Memory shadowing is turned on
automatically when the standby SPE has booted up and completed its own
memory testing. Each write operation in active memory is replicated in the
corresponding location in standby memory.
Table 1-6. Testability Requirements for Standby Components
Component Required Condition
PROCR handshake up
MEM-BD handshake up
SW-CTL handshake up
SYSAM handshake up
PKT-INT handshake up and Stby Refreshed
DUPINT handshake up
DUP-CHL handshake up
HOST-ADAPTER handshake up
DISK handshake up and Stby Refreshed
TAPE handshake up and Stby Refreshed
