| 摘要 |
A media adapter (110) for data communication over a twisted pair telephone network (150). The media adapter has a first interface (355) for receiving a first data signal and transmitting a second data signal. An encoder (360) coupled to the first interface generates a first reduced bandwidth signal in a data band from the first data signal. The bandwidth of the reduced bandwidth signal is less than the bandwidth of the first data signal. A decoder (330)coupled to the interface receives a second reduced bandwidth signal in the data band and generates the second data signal from the second reduced bandwidth signal. A second interface (305), which is coupled to the encoder and the decoder, transmits the first reduced bandwidth signal to and receiving the second reduced bandwidth signal from a twisted pair telephone network at frequencies within the data band. The data band (230) is at higher frequencies than a voice band (210) used for voice transmission on the twisted pair network. A collision signal generator (370) generates a collision signal when the media adapter is transmitting the firstreduced bandwidth signal to the twisted pair network. The collision signal is transmitted to the twisted pair network at frequencies within a collision band that is at higher frequencies than the voice band. The media adapter also includes a collision signal detector (340) that detects signals within the collision band on the twisted pair network indicating that a device connected to the twisted pair network is transmitting a signal within the data band.
|
