Loudspeaker Line Monitoring - Loop
From Zenitel Wiki
Loop monitoring provides continuous supervision of a loudspeaker circuit by wiring the speaker line as a closed loop, allowing the amplifier to monitor the entire cable path to and from the final loudspeaker. This enables the system to detect cable faults, such as open circuits and short circuits, while continuously verifying the integrity of the loudspeaker line.
As shown in the diagram, the loudspeaker line leaves the amplifier, passes through each loudspeaker, and returns to the amplifier on a separate conductor, forming a complete loop. The amplifier continuously supervises this loop, and if an open circuit occurs, the LSZDC card provides fault-tolerant recovery by feeding the loudspeaker line from both directions. This ensures that loudspeakers beyond the fault can continue to operate, making loop monitoring an excellent choice where high system availability and redundancy are required.
Key Points
- Loudspeaker line connected from A Cct to B Cct.
- AC surveillance tone (20Hz) used to monitor link.
- In the event of open circuit fault, audio is routed out of B Cct (fed both ways around the loop).
- Does not use signalling down cable screen.
- Compliant to EN54-16.
- Requires connection back to rack.
Configuration
- Please refer to the V2000 page