Munich, Germany (August 31, 2011)–Rohde & Schwarz has added a new redundancy solution to its R&S AEM100 emission multiplexer.
The new option aims to keep ATSC Mobile DTV transmitter networks better protected against faults and outages. A bit-identical signal is applied synchronously to the outputs of two redundant R&S AEM100 multiplexers. If errors occur on one R&S AEM100, the Mobile DTV data stream is switched interrupt-free to the other multiplexer, reportedly without the user noticing anything on the mobile receiver.
Network operators can use the R&S AEM100 multiplexer to expand existing ATSC transmitter networks to include ATSC Mobile DTV. The R&S AEM100 feeds the mobile data into the existing ATSC multiplex. A multiplexer for ATSC Mobile DTV is part of the active signal path, for which failsafe, redundant configurations are common. Rohde & Schwarz has added to the R&S AEM100 accordingly with a 1+1 redundancy option.
The new solution ensures that a bit-identical signal is applied synchronously to the outputs of the two multiplexers. A higher-level redundancy controller is not needed: The two multiplexers check each other’s results. The two instruments communicate with each other. If, due to an error, one of the multiplexers does not receive the input signals completely or processes them incorrectly, the error is immediately detected and eliminated. This ensures interrupt-free transmission.