DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Architecture
1-22SPE Duplication
1
Figure 1-8. Handshake Communication Path
Maintenance of Standby Components
When handshake communication is up , maintenance for individ ual components
of the stand by SPE is the sa me as t hat fo r the ac tive (exc ept i n some d etai ls for
PKT-INT). The same commands are used to test standby and active circuit
packs, and the error and alarm logs maintained on the ac tive side record data for
both.
If a major on-board alarm is raised against a standby SYSAM, Processor,
Memory, MSSNET, or Packet Interface board , the standby SPE’s SOH is lowered
to
partially-functional
. Once that board’s p roblem is fixed and the ala rm cleared,
syste m soft ware au tomat ical ly rais es the stand by SPE’s SOH to

not-refreshed

or
functional
, depending on whether its memory is up to date.
Standby component faults c an also affect memory shadowing . Certain faults can
have negative effects on system op eration if memory shadowing is left on. When
these components get major alar ms, memory shadowing is automatic ally kept off
by system software. These are referred to as

shadowing relevant

components.
Roughly, these include the hardware that provide shadowing or the hardware into
which shadowed writes oc cur.
Table 1-5 below shows the effect often major on-b oard alarms against standb y
components on standb y SOH and on memory shadowing. Note th at off-board
. . . . . . . . . . .
. . . . . . . . . . .
P
R
O
C
R
SMM
software
SMM: Standby Maintenance Monitor
Request
Response
MAP: Maintenance Action Process
Duplication
Interface Cable
D
U
P
I
N
T
Standby
SPE
Active
SPE
DUP
Driver
P
R
O
C
R
MAP
software
D
U
P
I
N
T