| 摘要 |
An improved backplane apparatus for transmitting signals to and from a modem system. The modem system includes more than one modem for transmitting data via at least one telephone line and via at least one network. The modem system has a first bus for management signal communication with the modems at a predetermined first data rate, and a second bus for transmitting data between the telephone line and the modems at a predetermined second data rate greater than the first data rate. The modem system also has a third bus for transmitting data between the modems and the network at a predetermined third data rate greater than the second data rate, and a fourth bus for distributing DC power and ground potential. The modem system defines a first impedance for terminating the first bus, a second impedance for terminating the second bus, and a third impedance for terminating the third bus. Finally, the modem system has structure for spacing the busses in layers in the backplane dependent on the data rate of the bus, and a plurality of connector assemblies for interconnecting circuit boards with the busses. Each connector assembly comprises an array of connectors arranged in rows and columns. The connectors are coupled to the busses according to a predetermined pattern dependent on the data rate of the bus, whereby the number of connector assemblies coupled to the first, second and third busses can be increased.
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