Annex B- Troubleshooting - Televes 7664 Manuel D'utilisation

ETHERNET-COAXIAL ADAPTOR 128 Mbps
Annex B - Troubleshooting
If there are problems in the connections of the data network, please check the following points:
1. Check that there is only one master in the network.
2. Check that the slave adaptors have the Sync Mode led on permanently.
3. Chack that the return channel is available in your coaxial network.
The return channel in the frequencies 4-21MHz must be able to operate in your coaxial
network in a downwards direction (headend-socket) and in an upwards direction (socket-
headend).
4. Check that the attenuation between adaptors does not surpass 50 dB in the opera-
ting channel: 4-21 MHz.
5. Check the TV signal filtering in the headend
To avoid interference from the TV headend in the data signal it is advisable to use diple-
xor filters. The diplexor filter (ref. 7653, 7654 or 7668) is recommended to mix the data
signal with the TV and to stop the headend from interfering in the data signal.
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Ref. 7664