Press Release

Christmas 2006 – 01

Case Communications provide Selex Communications with radio over IP equipment

Radio trunking in Romania

When SELEX-Communications, a Finmeccanica company, won a contract to provide a radio trunked network in Romania, they spoke to Case Communications about using the Case's KMX technology, which the two companies had so successfully used in their radio trunked network previously.

A system for the future

Their customer liked the time division multiplexing (TDM) technology, but asked if it was possible to provide a technology that was more 'future-proof' and also highly cost effective.

A Viper with a twist

Case Communications saw their Viper (Voice Over IP Router) as being the ideal platform for connecting the radio base stations to the main switch site, as it was both future proof, highly flexible and cost effective.

A radio trunked network has different requirements to VoIP (Voice Over-IP), which meant the standard Viper routers would require several changes to make the system operate successfully with radio.

Base connections

A Case Communications Multi-Access Router (a router designed to handle non-IP protocols over IP) was used to transport an HDLC stream between the main switch site and each of the base stations.

Software

Case Communications developed software to handle the 'always on' requirement and used the Viper G.729 compression to compress the radio channel down to 9Kbps. The FFSK channel was supported using 32Kbps ADPC.

For more details, see the SELEX Communications (UK) case study.