Lucent Technologies Release 7 Figure 9-91. Switch Control Connectivity

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 critic al system timing
signals and informs the SPE when these signals fail. For example, if the timing
sign als fro m a Tone/C lock c ircu it pa ck fai l, the Switch Contro l will inform the SPE
and t he SPE can then s witch to a st andb y Tone/Cl ock c ircu it pac k, (if
Tone-Clocks are duplicated).
On Hig h and Criti cal Rel iabi lity sy stems (dup licat ed SPE), a MAJOR a larm f ailure
of the Switch Contro l circ uit on the ac tive SPE re sults i n an SPE int ercha nge, i f the
health of the standby SPE permits. (Refer to Chapter 1for more informati on about
dup licat ed SPEs. ) The fo llowin g sec tion s assum e that if the SPEs are d uplic ated ,
and if a Switch Control circuit has a MAJOR alarm, the MSSNET circuit pack
associated with that Switch Control c ircuit is located in the stand by SPE.
As mentioned above, the MSSNET circuit pack c ontains both the Switch Control
circuit and the MSS Host Adap ter circuit. A failure of either circ uit will light the red
LED on t he MSSNET c ircu it pac k.
The test mssnet command tests both the Switch Control circuit and the MSS
Host Adapter circ uit on the MSSNET circuit pack. Whenever the MSSNET circuit
pack is replaced, test mssnet should be used to verify that both circuits are
operating correc tly.
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