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The sender and receiver are usually not connected directly to the transmission medium (or network). |
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An interfacing device usually stands in the middle between the sender and the transmission medium. |
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Similarly, another interfacing device mediates between the transmission medium and the receiver. |
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This is illustrated in Figure 10.1. |
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A communicating component such as each of the computers in Figure 10.1 is termed Data Terminal Equipment (DTE). |
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The interfacing device is termed Data Circuit-Terminating Equipment (DCE). An example of a DCE is a modem. |
