Televes Coaxdata 1Gbps-HDTV COAX+PLC 1ETH+1SFP - Manual (Page 32)

CoaxData 1Gbps-HDTV Ref.769201/Ref.769202
32
In MxU installations verify that there is only one master in the network
Verify that there is only one master in the network and that is installed in the head of your coaxial
installation. The presence of more than one master modem in the network may cause system
malfunction. Make sure there is only one master in the network.
You can check device configuration with CoaxManager ™ .
Verify that the return channel is available in whole coaxial network.
The return channel, which includes data operation bandwith 2 to 67,5 MHz, must be operating at whole
coaxial network, and can send signals in a two direction; from downstream (head to sockets) and from
upstream (sockets to headend).
Check the presence of line amplifiers with active return path channel. As far as possible, replace by
amplifiers with passive return path or by a bypass with diplexer filters as shown in this manual.
Consider all elements of coaxial network like outlets, taps or splitters and check support operating
bandwith 2 to 65Mhz.
Check coaxial network attenuation on return path
The attenuation between modems should not exceed 85 dB in the operating channel: 2 to 67,5 MHz;
Calculate estimated attenuation and check that all the connections have been made properly. You can
also use the application CoaxManager
™ that can estimate attenuation between installed modems.
Filter TV signal on headend with diplexer
Check master links and If there is an asymmetry in the performance of the uplink and downlink; perhaps
this is due to return path noise introduced by headend. This detection can be accomplished by querying
the status of links in CoaxManager:
To avoid interference, it is recommended use filters diplexers that mixes data with TV signal, according
the following scheme.
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