Telemedia links up Lesotho


Telemedia has recently completed the first phase of the radio expansion for Lesotho National Broadcasting Service (LNBS).

The LNBS requirement was to provide a downlink solution for 14 remote sites to enable them to provide 16 radio services per site. Each system had to decode the radio services from the DTT (Digital Terrestrial) satellite T2MI distribution signal, as well as provide a backup link for each of the radio services via an IP circuit. Additionally, a return channel for a radio service from each remote site back to the head end was to be made available for contributions from the regions. Until now, LNBS was not able to switch their satellite distribution signal to the T2MI modulation scheme for the DTT transmitters because they weren’t able to extract the radio services from the T2MI feed for the remote FM transmitters.

The Telemedia solution was provided using equipment from Appear Television, Wohler and Comrex.

The solution was implemented by extracting all 16 radio services from the DTT HE (head end), main and standby servers, and packaging each stereo pair to be streamed to the 14 remote sites via IP circuits (supplied by a third-party service provider).

At each remote site, the decoders use the satellite T2MI signal as a primary feed and automatically switch to the IP stream as a backup for each radio service.

The IP network supplied the backup radio services each site, return radio channels, monitoring and control of the remote encoding/decoding equipment and an additional circuit for ancillary remote monitoring applications.

An AES audio distribution and monitoring system was also supplied, which allows LNBS personnel to monitor all incoming radio feeds and split them between the DTT main and standby head ends.

This completes Phase One of the project, whereby equipment for the HE and four remote sites have been completed. Remaining sites are to be implemented as soon as their equipment housings have been completed onsite.

Additionally, a mobile workshop for the engineers servicing the remote sites was supplied. This was based on a Land Cruiser 76 series: the vehicle was modified with extra travel suspension, winch and recovery kit to enable it to reach the extreme remote sites.

The bin section was kitted out with an aluminium canopy with a movable load shelf to mount and transport transmission equipment, with an inverter generator and tools to service the kit onsite.


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