Repeater Backup Application Notes
1. Overview
1.1 Definition
The Repeater Backup feature is a mechanism that guarantees the smooth operation of the repeater in
the event of a breakdown. The two repeaters are deployed in the system. When one repeater in
normal operation (Work Repeater) fails, the other available repeater in backup state (Backup Repeater)
will automatically take over the repeating function.
1.2 Applicable Repeater
This feature is available for DMR digital repeater and XPT repeater, including RD62X, RD96X, RD98X,
and RD98XS.
1.3 Principle
The work repeater and backup repeater are connected using a backup cable, as shown below.
When the work repeater operates properly, it outputs low level through Pin 3.This low level is routed
to Pin 12 of the backup repeater through the backup cable, making the backup repeater enter backup
state. In this case, the backup repeater is automatically disabled except for detecting the status of the
work repeater through the backup cable.
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