ATEIS IDA8 - Manual (Page 152)

ATEIS - IDA8 152
© 2012 ATEÏS
4.2 Consoles and Accessories
4.2.1 Redundancy Unit
4.2.1.1 Overview
PAVA systems in very highly sensitive places like nuclear power centrals, underground industrial
systems or places where people have to thrust on a 100% availability of a PAVA system, may require
for redundancy on any part of the PAVA system. Redundancy is a very widely-spread expression that
needs to be further specified into a required level of redundancy. In normal PAVA systems where other
communication means are available, spare amplifiers and surveillance of essential components is more
than enough. Higher levels of redundancy may require for A/B wiring of the loudspeaker lines where loss
of the A or B line or system still ensures a minimum coverage of 50% of the venue. (Such requirement is
detailed described in the BSI-5839 -part 8). But even that could not be enough in situations where the
PAVA is the only and last means of communication. In this case an even higher level of redundancy
may be required. At this level, not only the amplifiers have redundancy by means of active spare
amplifiers, also the central equipment will have a full back-up.
This is what we call: Full-Redundancy. AteÏs RU provides this high level of redundancy. RU is a thorough
switching device that acts as a Primary / Secondary switching device