| 摘要 |
A PC card modem 1 is connected to a PC 3 by means of a physical port connection 5. Software stored on the PC controls the operation of the modem by means of transferring operational data to and/or from registers of the modem. To facilitate this, two data communications channels 25, 29 are created between the modem and the PC, these channels being configured for use in the modem's operational phase. A COM port data channel is used to transfer conventional operational data, whilst a so-called "auxiliary channel" is used to transfer other forms of data, such as status and configuration data. By configuring the auxiliary channel to be independent of the COM port channel, auxiliary data is transferred independently of the operational data, providing an overall increase in throughput. The auxiliary channel uses a different data transfer protocol, such as an asynchronous data transfer protocol. |
