2.4.3.3 Central Processor Intervention (CPI)
Central Processor Intervention (CPI) is a high priority method of communication
between the workstation and the SM-2000 that bypasses the normal communication
protocol.
CPI messages are sent over the workstation’s RS-232 ports (ports 0/1) to the CPI
paddleboards (982YN) on the SM-2000 backplane. The CPI is a square circuit board
that contains circuitry and connects through the SM-2000’s backplane into its
respective circuit pack. Additionally, on its outside edge there are two modular
telephone jack receptacles. One is used to terminate the cable connected to the
Serial/Parallel patch panel and the other is used to terminate a cable connecting the
CPI paddleboard equipped in MCTSI 0 to the CPI paddleboard equipped in MCTSI 1.
The CPI’s primary functions are to control forcing/clearing conditions on the MCTSI,
control the sanity timer and provide for TMS switching. Refer to Figure 2-8.
The CPI paddleboards’ top jacks are cross-connected between service groups to allow
for mirroring of information being sent to it.
For more information about CPI, see 235-100-125, 5ESS Switch System Description,
235-600-700, Input Messages Manual or 235-600-750, Output Messages Manuals.
Figure 2-8 —
Ethernet
and CPI Interface
235-200-150
Feburary 2007
5ESS
®
SWITCH DISTINCTIVE REMOTE MODULE
Issue 3.00O Page 2-11
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