DUPINT (Duplication Interface Circuit Pack)
Issue 4 May 2002
10-703555-233-123
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.
NOTE:
You can ensure that memory shadowing is not active by locking the
active SPE online.
■ does not disrupt system operation.
When the standby Duplication Interface circuit pack is reinserted, it resets the
standby processor. Table 10-257 on page 10-703 details the consequences of
removing either the active or standby DUPINT.
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.
Table 10-257. Standby Duplication Interface circuit pack removal interactions
If Then
A carrier DUPINT removed SAT connection broken
B carrier DUPINT removed System performs as simplex
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