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LBI-38965
Figure C.1 shows the architecture for a fault tolerant EDACS billing system.
Console
Terminal
Redundant MIM processors are added to each RF System interface within the IMC. A duplicate CAM is added, which
connects to the redundant BCU/CAL and tape drive.
REDUNDANT OPERATION
The primary and redundant MIM processors operate in a hot standby configuration, i.e., once primary unit failure is
detected, the backup becomes the active processor with minimal disruption to calls in progress. The redundant CAM,
BCU/CAL and tape drive are operated as on-line mirror duplicates. This eliminates any changeover operation; in the event of
failure of one BCU/CAL, or its associated components; the remaining unit continues to operate and process call activity.
C-2
Console
Terminal
BCU
BCU
Figure C.1 - EDACS Billing Fault Tolerant Architecture
RF
System
Primary
Backup
Downlink
Downlink
MIM
MIM
(Backup)
(Primary)
C
A
M
AREA
IMC
C
A
M
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