Avaya Definity SI Maintenance Manual page 1489

DUPINT (Duplication Interface Circuit Pack)
Hot plug-in and removal
The standby TN792 circuit can be hot-swapped or removed if the active SPE is
locked online without having first removed carrier power. Inserting or removing a
standby Duplication Interface circuit pack from a control carrier
does not disrupt the EM-Bus of the opposite control carrier if (and only if)
the memory shadow is not active at the time.
does not disrupt system operation.
When the standby Duplication Interface circuit pack is reinserted, it resets the
standby processor.
removing either the active or standby DUPINT.
Table 10-257. Standby Duplication Interface circuit pack removal interactions
If
A carrier DUPINT removed
B carrier DUPINT removed
Control leads on the ICC
Duplication Interface circuit pack A controls a lead that lets the Tone-Clock circuit
packs know which Tone-Clock is supposed to be active and additional leads that
control which SPE is active. The system software can request that either the SPE
Select lead or Tone-Clock lead be changed.
The Duplication Interface circuit packs communicate over the Inter-Carrier Cable
(ICC), which connects the Duplication Interface circuit packs through pin fields on
the backplane. The ICC consists of two 25-pin connector cables known as ICC-A
and ICC-B.
NOTE:
A single-carrier cabinet system also has an ICC-C. The pin fields where
ICC-A and ICC-B connect are clearly labeled on the backplane near the pin
fields for the Duplication Interface circuit packs. The ICC carries several
important leads related to maintaining a High or Critical Reliability system.
ICC-A may be duplicated in both MCC and SCC cabinets with the TN792.
However they may be left in if desired.
555-233-123
NOTE:
You can ensure that memory shadowing is not active by locking the
active SPE online.
Table 10-257 on page 10-703 details the consequences of
Then
SAT connection broken
System performs as simplex
Issue 4 May 2002 10-703