Off-line broadband network interface

(57) While receiving packet data from a summary common medium, the network interface which performs signal processing required in order to change a data packet into host computer format data separately from reception of a data packet is offered. This network interface receives a data packet, and an analog signal is changed into a digital signal, and it memorizes a consequential sample packet at memory cue. The off-line processor which may be made into the host computer itself carries out signal processing required in order to インタープリット the above-mentioned sample packet. In transmission, the above-mentioned off-line process memorizes it in transmission queue while changing the above-mentioned host format data into the digitization form of the data packet for transmission. A transmitter changes the above-mentioned data packet for transmission, and transmits the data to the above-mentioned common medium.