| 摘要 |
A bi-directional communications system for bypassing a telco local exchange carrier telephone system for conveying data between at least one terminal unit and a switching unit that has the functionality of a Class 5 central telephone office switch that is connected to a public switched telephone network. The system includes a relay transceiver where the signals from the terminal units are converted bi-directionally between the signal format of the terminal units and fixed length compliant ATM cells when the signal format of the terminal units is other than a fixed length compliant ATM cell format. In a transmission interface unit there is a bi-directional conversion of the fixed length compliant ATM cells to time division multiplexed signals in the upstream direction and from time division multiplexed signals to fixed length compliant ATM cells in the downstream direction, wherein the upstream signal direction is toward the transmission interface unit and the downstream signal direction is toward the terminal units. Further, the system includes the transfer of the time division multiplexed signals to the switching unit. In another embodiment of the present invention there can be at least two terminal units each designed to transmit and receive in different signal formats from each other and a programmable relay transceiver unit.
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