| 摘要 |
Modems for data transmission between a terminal (PC) and a network are disclosed. To improve modem control or modem use with a smart card, the modem may be provided with a housing (80) for a smart card (120) with a card connector (110) and a card interface circuit (100), and the modem microcontroller (50) controlling communication with the network under the control of the PC may also be designed to control the card interface circuit. Said microcontroller is thus at the core of both the modem and a smart card reader. Communication with the card is performed using so-called 'AT' commands, and the systematic prefix sequence 'AT' (whereby the microcontroller recognises that it must perform an operation) is combined with a subsequent second systematic prefix sequence when a communication operation is to be performed between the terminal and the card. The second prefix sequence is preferably '+G'.
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