Access Technologies: DSL and Cable by James H. Green

By James H. Green

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6. If two stations transmit simultaneously, their frames collide and are mutilated. Any station on the network hearing the collision sends a jamming signal. This signals the stations to cease transmitting and back off for a random length of time before attempting to transmit again. The reason for the random time is so that stations don’t immediately attempt to transmit and collide again. As Fig. 4 shows, each Ethernet frame has a 4-byte cyclical redundancy check (CRC) block immediately following the data block.

The products compress the voice signal down to a fraction of the 64-kbps bandwidth of a conventional voice channel. Voice can be compressed to 8 kbps with only a small loss of intelligibility. The quality is equivalent to a solid cell phone connection. The protocols add some overhead, so the number of channels is less than a straight multiple of the compressor output, but the voicecarrying capacity is substantial. Note, however, that faxes and modems require an uncompressed channel. The amount of bandwidth the voice channel occupies depends on the protocol used.

6. If two stations transmit simultaneously, their frames collide and are mutilated. Any station on the network hearing the collision sends a jamming signal. This signals the stations to cease transmitting and back off for a random length of time before attempting to transmit again. The reason for the random time is so that stations don’t immediately attempt to transmit and collide again. As Fig. 4 shows, each Ethernet frame has a 4-byte cyclical redundancy check (CRC) block immediately following the data block.

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