Redundancy Funtions

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This article describes different redundancy concepts for PA system in general and for Exigo.

The Exigo system supports several redundancy functions, allowing even a single system to become more redundant.
Depending on different demands that projects may have, there may be a need for one or more redundancy functionality.

Backup Amplifier

This is also refereed to as hot standby amplifier.
The basic concept is that if one amplifier fails, a backup amplifier will take over.
Exigo ENA2200, ENA2400-AC and ENA2400-DC Amplifiers have inbuilt support for backup amplifier switch-over where one amplifier can be designated as backup for up to six other amplifiers.

Backup Amplifier

This functionality is available from Exigo 1.3 and later.
More information about this feature can be found here.

A-B Wiring

To avoid loosing audio coverage in a area if an amplifier fails, it is possible to design the solution with A-B wiring.
The concept is that you design the speaker layout in a given area (typically a zone) so that the speakers are managed from two different amplifiers.
If one of the amplifiers fails you still have audio in 50% of the speakers.

A-B Wiring

Redundant Controller

The Exigo system controller can also be duplicated (hot standby) to ensure full operation of the system in the event of a faulty system controller.

Redundant (hot standby) Controller

More information about this feature can be found here.

A-B System

A complete A-B system consists of two complete PA systems that work together as one system.
Both systems will have a System Controller and a number of amplifiers.
The A and the B system must be physically separated.
If one of the system fail you will still have audio coverage.

A-B System Principle

More information about this feature can be found here

Network in A-B System

For A-B System it is important to have redundancy between the A and B System.

Network A-B System

In order to achieve this there must be 2 or more links between the switches.
The panels connected to both switches do not have the capacity to act as a link between the switches.


These examples are the most typical redundancy functionality that is used in PA systems.
It is also possible to combine two or more for even more redundancy.