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Case history: Central router with line equalizers

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Telekom Austria operates a central router that switches all radio stations to the contribution and distribution lines all over Austria. In addition to the radio studios, Telekom Austria also switches the lines that come from the many concert halls and theatres in Vienna. These houses are connected via copper lines whose frequency response curves have to be equalized. Mandozzi Elettronica SA was the only manufacturer capable of offering and supplying a router that fulfilled Telekom's requirements.

The router contains 240 redundant line equalizers that are adjusted and monitored by two separate operating positions. The equalizers are realized by means of digital signal processors whose parameters are stored in two separate memories. The frequency response curves are controlled by rotary knobs or by drawing the filter curves on touch screens that display the resulting line curves.

The fully redundant router is managed by two separate working positions for redundancy.
It has more than 300 audio inputs and outputs, 64 of which are four-wire connections. It realizes 60 stereo to mono conversions, a level monitoring system that compares the levels to pre-programmable upper and lower thresholds, a system to generate various voice announcements, and a system to listen to the audio signals and to display their levels.

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Case history: Large radio station (Northern country)

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A non disclosed Northern European broadcaster was looking for a central router that serves many existing mixers. Mandozzi realized a fully redundant router with 15 concentrators installed in the various studios to connect the mixers.

The concentrators are connected to the router via redundant optical fibres. Every studio is equipped with a PC that controls that part of the router that corresponds to the lines of this studio ("virtual router").

The access rights of all the control PCs are allocated by the router supervisors.

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Case history: Radio1, Zurich (Switzerland)

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Radio1 is a private radio station in Zurich that operates two studios. Mandozzi supplied a fully redundant router plus two SERIX mixers with 16 motorized faders each.

The mixer concentrators with the mixer cores are installed together with the router in the technical room; the studios have only the mixer surface modules.

The router directly controls Prodys ISDN codecs and DABIS audio workstations. The journalists work with small Jünger mixers that are also served by the router.

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Via Volta, 2 - 6946 Ponte Capriasca - Switzerland
Phone: +41-(0)91-9357800 - Fax: +41-(0)91-9357810

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