Maintenance Manual

Chapter 2 Fault Tolerance
Peripheral Gateways
2-18
Cisco ICM Enterprise Edition Administrator Guide Release 6.0(0)
Managers (PIMs) typically use the hot standby approach. Figure 2-7 shows how
synchronization and hot standby are employed in a duplexed Peripheral Gateway
(PG).
Figure 2-7 PG Fault Tolerance
The OPC processes communicate with each other via a private network
connection and the Message Delivery Service (MDS). The MDS provides a
synchronizer service which combines the input streams from the PIMs and PG
Agents on both sides of the PG to ensure that both OPC processes see exactly the
same input.
The OPC process is responsible for activating PIMs and PG Agents on each side
of the duplexed PG. The OPC process also supplies uniform message sets from
various PG types to the Central Controller.
The PIMs manage the interface between different types of ACDs and the OPC.
PIMs are duplicated on each side of the system and operate in hot standby mode.
A PIM can be active on either side of the duplexed PG, but not on both sides at
ACD2
PG Side B
PG Agent
OPC
OPC
PG Side A
PG Agent
PIM 1 PIM 2 PIM 3
ACD1
Idle path
Active path
PIM 2PIM 1
PIM 3
ACD3
To Side A
CC Agent
To Side B
CC Agent
To Side A
CC Agent
To Side B
CC Agent
CTI Links
Synchronized Processes
Central Controller
Side A
Central Controller
Side B
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