Lucent Technologies DEFINITY Enterprise Communications Server Release 6 Instructions Manual

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Maintenance Architecture 
Page 1-15 SPE Duplication 
1
nIf the two SPEs have different SOH, the SPE with the better SOH becomes 
or remains the active SPE.
These descriptions apply to SOH levels on the standby SPE. Four possible levels 
of SPE SOH are supported and maintained by system hardware and software.
Standby SPE Maintenance Architecture
The maintenance strategy for the standby...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Maintenance Architecture 
Page 1-16 SPE Duplication 
1
As shown in Figure 1-7, all maintenance capabilities for the standby SPE are built 
upon these three strategies.
Figure 1-7. Components of Standby Maintenance
Standby SPE maintenance software is designed to attempt to self-correct 
problems. If a problem occurs, this software automatically tries to address the 
problem, bring the...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Maintenance Architecture 
Page 1-17 SPE Duplication 
1
SPE software. SMM also ensures that when handshake communication has been 
down for an extended period, the standby SPE will transition into the SPE-down 
state.
Handshake Communication
Every 30 seconds, the active SPE sends a handshake request message to SMM 
and waits for SMM to respond with a handshake response message. This...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Maintenance Architecture 
Page 1-18 SPE Duplication 
1
Figure 1-8. Handshake Communication Path
Maintenance of Standby Components
When handshake communication is up, maintenance for individual components 
of the standby SPE is the same as that for the active (except in some details for 
PKT-INT). The same commands are used to test standby and active circuit 
packs, and the error and...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Maintenance Architecture 
Page 1-19 SPE Duplication 
1
alarms, minor alarms and warning alarms have no effect on memory shadowing 
or on the SOH of the standby SPE.
When handshake communication is down, but the standby SPE is not in 
SPE-down mode (SOH is not 
nonfunctional), autonomous testing of standby SPE 
components by the SMM occurs on the standby SPE. If a component fails a test...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Maintenance Architecture 
Page 1-20 SPE 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, ‘‘
Responding to Alarms and Errors’’, and in 
‘‘
STBY-SPE (Standby SPE Maintenance)’’ in Chapter 9, ‘‘Maintenance...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Maintenance Architecture 
Page 1-21 SPE Duplication 
1
When shadowing into the standby SPE has been off (as when the system first 
comes up), system software checks to see if it is safe to restore shadowing. 
Handshake communication must be up. Then software verifies (with Test #920) 
that the SPEs have identical hardware configurations. If this passes and there are 
no shadow-relevant...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Maintenance Architecture 
Page 1-22 Power Interruptions 
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5. If memory shadowing is successfully turned on, initiates the process of 
overall memory refresh
6. When refresh completes, if there are no critical component major alarms, 
raises the standby SPE’s SOH to level 
functional
Standby SPE initialization is a lower priority than initializing the active SPE and is 
therefore...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Maintenance Architecture 
Page 1-23 Power Interruptions 
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Nominal Power Holdover
AC-powered multicarrier cabinets are equipped with an internal battery, 
powered by its own charger, that provides a short term holdover to protect the 
system against brief power interruptions. This feature, known as the Nominal 
Power Holdover, is optional on cabinets supplied by a UPS and required on...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Maintenance Architecture 
Page 1-24 Protocols 
1
power is restored, taking up to 15 minutes, depending on the size of the system. 
Human intervention may be required if central office equipment has been busied 
out.
EPN Cabinet with Power Holdover
When power is interrupted to an EPN MCC for less than 15 seconds, no service 
effect results. If the interruption exceeds 15 seconds, only...