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0448-2013

Checking the return channel for CoaxData facilities

Description: 

In many cases, the facilities are not ready to support applications that use the return channel (5-60 MHz). The fact that the signals are on UHF DTT causes forgetfulness of “low frequencies”.

Homeplug CoaxData uses the return channel (7.5 to 30 MHz) to establish a data network in a coaxial facility. It is a Plug&Play system as long as the return channel has a minimum quality for transmissions.

The quality is assessed by a maximum attenuation (80 dB) and a minimum C/N. The better these parameters, higher transmission rate will be achieved.

For checking the network it is necessary to use a noise generator Ref 5930 (or a return channel simulator Ref. 7637).

Thanks to these screens, is detected the presence of a filter which limits the band to 14 MHz, which will result in a real reduction of the bit rate. Without such a filter (that allows connecting CoaxData and TelevesIntegra) the bit rate that could be obtained would be 200 Mbps.

In addition, it is found that the attenuation (if compared with the previous record of the output level of the noise generator) is correct.

CoaxData features a software application (Coaxmanager) which allows knowing the transmission bit rate, in addition to representing a frequency response

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