Devolo dLAN 200 AVpro - The Deployment of Devolo Dlan Technology in Antenna Networks; Fig. 3-7: Typical Tree Structure Configuration in an Antenna Network

devolo dLAN® 200 AVpro Project Manual
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3.5 The deployment of devolo dLAN technology in antenna
networks
devolo dLAN 200 AVpro technology transports data in 2 to 30 MHz frequency band.
TV or radio signals are not normally allocated to this frequency band in the antenna
network, and it can therefore be used for data traffic. You need to take account of
the fact that the signals are bidirectional here, whereas TV and radio signals only
move in one direction (downstream).
The network topology employed usually takes the form of a tree structure, and in
rarer cases, a star structure. Several endpoints (apartments, rooms etc.) are fitted to
each cable leg in a tree structure. Usually each cable leg has between 8 and 10
endpoints, otherwise the attenuation on the cable leg is too high.
Fig. 3-7: Typical tree structure configuration in an antenna network
Per endpoint, one devolo dLAN 200 AVpro adapter transmits the signals from the
antenna cable to the LAN. The data format complies with the Ethernet standard. A
devolo dLAN 200 AVpro adapter configured as a master converts the signals to
Ethernet at the base of each cable leg, and communicates with the Internet via a
switch (router, etc.). The individual segments are insulated against one other with
high-pass filters (see Section 3.5.7).