Ericsson LBI-38965B Manuel d'utilisateur télécharger pdf (Page 64)

LBI-38965 FAULT TOLERANCE

C-2

Figure C.1 shows the architecture for a fault tolerant EDACS billing system.

System

Console

Terminal

MIM

(Primary)

MIM

BCU

AREA

IMC

Console

Terminal

To StarGate

Primary

Downlink

Backup

Downlink

(Backup)

Figure C.1 - EDACS Billing Fault Tolerant Architecture

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.

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Ericsson LBI-38965B Manuel d'utilisateur Page 64