in the following description , for the purpose of illustration , numerous specific details are provided . as will be apparent to the skilled person , however , the invention is not limited to such specific details and the skilled person will be able to devise alternative arrangements . as previously mentioned , high speed home network systems which utilize various cables of the house exist in the art . such prior art systems comprise a residential broadband cable communicator ( rbcc ) which is connected on one hand to any type of home device ( such as computer , tv , tv cable modem , iptv , etc .) or an internet provider modem and on the other hand to one or more of plug sockets within the house . as previously mentioned , the prior art systems suffer from several drawbacks , such as : ( a ) they apply a “ fixed ” selection of the communication over only one type of home cable , and when this cable fails for some reason , the communication fails ; ( b ) they cannot automatically determine and preferring the communication from one type of cable to another , when degradation in the communication quality occurs ; and ( c ) they do not provide a continuous operation while switching between channels . the setting up of such a home network is relatively easy , it requires only connecting a rbcc at each home device spot . each rbcc is typically a plug - and - play device which is capable of connecting automatically to another ( rbcc ) for transfer of high speed data between them . for example , the data rate may reach 85 - 200 mbps . the rbcc device may have an optional wireless / wi - fi interface for providing wireless coverage as well . fig1 illustrates an embodiment of a home network employing the present invention . in this embodiment the network coverage is extended using only existing infrastructure cables 101 of the house 102 . an internet service provider ( isp ) 103 communicates with the house in a conventional manner using isp modem 104 which is located at room a of the house . a rbcc 105 is connected at room a to the isp modem 104 using , for example , a cable 106 , or wirelessly ( for example using a cat - 5 cable , usb cable , wi - fi , etc .). other rbccs are connected similarly to other home devices . for example , rbcc 131 is connected in room c to a phone device 133 and to personal computer ( pc ) 132 . still another rbcc 120 is connected wirelessly at room b to laptop computer 121 , and to an iptv ( internet protocol tv ) 122 . once a rbcc is connected to a home device and / or to an isp modem , it may be connected to any one or more of plug sockets available at the respective location . a plug socket may lead , for example , to a phone line 107 , coaxial cable 108 , or power - line 109 . in this embodiment , the rbcc 105 is connected at room a to sockets 107 - 109 , therefore capable of communicating data to any phone , coaxial or power - line socket respectively available in the house . it can be seen that , for example , rooms a and b are equipped with different types of sockets . in room a , phone 110 is connected to a second rbcc 111 , which is in turn also connected to the power - line socket and coax socket , therefore , data is communicated to phone 110 through the power - line 112 and coax cable 113 . the rbcc 105 , and rbcc 11 , both located in room a , communicate over both the coax and power lines , however , rbcc 111 is adapted to automatically sense the channel providing the better quality and selects the data received through it . as a result , data is automatically received through the best available channel . in one embodiment the rbcc transmits data simultaneously at all the channels available , i . e ., the power lines , the coax lines , and the phone lines . on the receiving side , the corresponding rbcc senses the three channels , determines the channel which provides a best quality signal , and selects receipt the data over said best channel , as determined . it is well known that lines are subjected to noises and other interruptions . a significant advantage of the present invention resides in the capability of automatically sensing and selecting the channel which provides best quality of communication . generally , all the channels that are available at each rbcc location , respectively , are used for communicating data . therefore , even when a channel fails or becomes very noisy , the rbcc detects such degeneration of the channel , and switches to receive data from another channel . the rbcc continuously senses the amplitudes of all the signals received , and switches to receive data from the best quality channel which , provides the signal with the highest amplitude . in another embodiment , another criteria than a highest amplitude signal may be applied for selecting the best quality signal ( and the corresponding channel ). in still another embodiment , the determination of a best quality channel is made periodically . such a manner of operation maintains transmission continuity even when switching between channels is required . referring to room b , rbcc 120 supports the wi - fi protocol and is connected wirelessly to a lap - top 121 and through a coax cable 125 to internet protocol tv ( iptv ) 122 . the rbcc 120 is connected to both coax socket 123 and power socket 124 , and therefore it can communicate with other rbccs over the coax line and / or the power - line respectively . another scenario is illustrated with respect to room c . the rbcc 131 is connected to a personal computer ( pc ) 132 and to a phone device 133 . the rbcc 131 is connected in parallel to both phone socket 135 and to power - line socket 134 . however , the power - line socket 134 in room c belongs to a different phase than the power - line socket 124 of room b . in addition , there is no phone socket in room b , and therefore there is no common wiring that directly connects rooms c and b . in this case , the communication between pc 132 in room c and the lap top computer 121 in room b is performed through the rbcc 105 of room a . then , rbcc 105 of room a transfers the data which received from room c to room b ( rbcc 120 ) through either the respective power or the coax lines which connect between said two rooms . therefore , data can be transferred between two rooms event when there is no direct lines connecting between them . furthermore , data may transfer through power - lines even when there is no electricity in the line . rbcc may comprise build - in qos application which supports smooth and leg - free streaming . the rbcc is also adapted to prioritize the data transferred according to user settings and logical definitions . the system utilizes the unused frequency spectrum , namely , 5 - 30 mhz . the system provides multi - level qos besides high bandwidth . lighting - up the dark unused frequency spectrum , namely , 5 - 30 mhz , prevents interrupting to applications in a lan which are bandwidth consuming and delay sensitive . one may easily view iptv over a power - line or coax and access the internet at the same time fig2 schematically illustrates in block diagram form the general structure of the rbcc 201 according to an embodiment of the present invention . at side 202 the rbcc is connected to the house infrastructure . in this embodiment the rbcc 201 has three ports that are adapted to connect to phone line 203 , coax line 204 , and power line 205 . second side 206 provides connection to one or more of ethernet devices ( iptv , pc , streamer , laptop , phone , hdtv , modem and etc ). generally , this side comprises controllers for connecting to home devices through cat5 , coax , power - line , wi - fi , or twisted pairs . the transmission of the rf signals by the rbcc 201 is broadband and full - duplex . once signals are received from the house infrastructure via one of channels 203 - 205 , they are filtered by filters 207 - 208 , and then enter the rf splitter - combiner 209 . the combined signal is then conveyed to selector 210 of the home plug unit 214 . selector 210 senses the combined signal from which combines a same data which is received simultaneously ( in case that indeed plurality of channels connect between the communicating rbccs with respect to said signal ), determines the best signal from among said combined signal ( as said , each of the signals is received from a different channel ), and conveys the selected signal to the home plug modem 211 . filters 207 - 208 are designed to allow all the plurality of rf signals to run simultaneously on the plurality of channels without collision or mutual interferences . the transformers 212 - 213 are responsible for insulation and impedance matching with the respective channels wires for maximizing the power transfer and minimizing reflections from the ethernet devices connected to the rbccs . fig3 illustrates a circuit diagram of one exemplary embodiment of a rbcc . in this embodiment the capacitance , resistance , and inductance values of the capacitors , resistors and coils have been selected to allow all channels ( power - line , phone , and coax ) transfer data in parallel ( i . e ., simultaneously ). the power - line connectors 301 connect between the home plug modem ( not seen ) and the rf splitter 302 . rf splitter 302 in this embodiment is connected to a high pass filter ( hpf ) 303 for preventing interferences from the home plug modem ( not shown ) to the phone channel 304 , and from the power - line 305 to the coax line 306 . the rf splitter 302 is also connected to a low pass filter ( lpf ) 307 for preventing interferences from the power - line 305 to the coax line 306 . the rbcc operates at low frequency band , namely , 5 - 30 mhz . the upstream frequency ( i . e ., from an ethernet device to the rbcc ), and the downstream frequency ( i . e ., from the rbcc to the ethernet device ) operates at the same 5 - 30 mhz band . the system is capable of supporting up to 256 end - users and supply broadband access to the internet . in this embodiment the system supports 16 rbcc devices . the circuit of fig3 provides filters that support a dynamic range of 90 db . this dynamic range is considered to be 10 db higher than the range of similar prior art systems ( a significant improvement in the logarithmic scale ). as demonstrated , the rbcc of the present invention provides a reliable broadband communication over different types of existing cables in a house . the communication between two rbccs is performed simultaneously on plurality of channels , when available . a selector at the receiving rbcc senses the received signals over the plurality of channels , and automatically selects the best quality signal . the amplitudes of all the signals received are continuously compared and the highest amplitude signal is considered as the best quality signal , and the corresponding channel is selected . said best quality signal is then processed , and the others are ignored . therefore , the invention enables operation also when one of the channels fails , as another one is selected . in such a manner , a continuity of operation is assured . in another embodiment , the determination of the best channel may be made periodically . while some embodiments of the invention have been described by way of illustration , it will be apparent that the invention can be carried out with many modifications , variations and adaptations , and with the use of numerous equivalents or alternative solutions that are within the scope of persons skilled in the art , without departing from the spirit of the invention or exceeding the scope of the claims .