DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1551SW-CTL (Switch Control)
9
The Switch Control also contains hardware to monitor critical system timing
signals and informs the SPE when these signals fail. For example, if the timing
signals from a Tone/Clock circuit pack fail, the Switch Control will inform the SPE
and the SPE can then switch to a standby Tone/Clock circuit pack, (if
Tone-Clocks are duplicated).
On High and Critical Reliability systems (duplicated SPE), a MAJOR alarm failure
of the Switch Control circuit on the active SPE results in an SPE interchange, if the
health of the standby SPE permits. (Refer to Chapter 1for more information about
duplicated SPEs.) The following sections assume that if the SPEs are duplicated,
and if a Switch Control circuit has a MAJOR alarm, the MSSNET circuit pack
associated with that Switch Control circuit is located in the standby SPE.
As mentioned above, the MSSNET circuit pack contains both the Switch Control
circuit and the MSS Host Adapter circuit. A failure of either circuit will light the red
LED on the MSSNET circuit pack.
The
test mssnet
command tests both the Switch Control circuit and the MSS
Host Adapter circuit on the MSSNET circuit pack. Whenever the MSSNET circuit
pack is replaced,
test mssnet
should be used to verify that both circuits are
operating correctly.
Figure 9-91. Switch Control Connectivity
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EXP-INTF
Circuit Pack
Port
Circuit Pack
Port
Circuit Pack
Port
Circuit Pack
UN332
MSSNET
Circuit
Pack
Switch
Control
Circuit
. . . . . . . . . . . . . . . . .
Switch
Processing
Element
A
TDM Bus
UN332
MSSNET
Circuit
Pack
Switch
Control
Circuit
. . . . . . . . . . . . . . . . .
Switch
Processing
Element
B
(if SPEs are
duplicated)
PPN
