Lucent Technologies Release 7 Locking the Active SPE, Memory Shadowing

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
Dupl icat ion In terfa ce ha rdwa re sup por ts the abil ity to lock the ac tive SPE i n
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, ‘‘Ma intenance Object
Repair Procedures’’. In locked mod e, the system operates as if it is simplex :
■The standby SPE is inaccessible to the active SPE and active G3-MT
login.
■No SPE-in terc hange is po ssib le.
■Handshake is down and mem ory shadowing is off.
The locked state is intended for temporary use to prevent intercha nges during
maintenance sessions. No alarm is raised when the switches are locked.
Howev er, al arms a gain st SPE-SELE a re rai sed l ater if the sw itch es are left o ut of
the AUTO position for an extended leng th 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 standb y SPE has booted up and comple ted its own
memory testing. Each write operation i n 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 hand shake up
SYSAM handshake up
PKT-INT handshake up and Stby Refreshed
DUPINT handshake up
DUP-CHL handshake up
HOST-AD APTER hand shake up
DISK handshake up and Stby Refreshed
TAPE handshake up and Stby Refreshed