Modem having speed notifying means

A modem which is connectable to terminal equipment and for communicating with an other modem via a transmission line, the other modem connectable to other terminal equipment, said modem comprising:

• data transmission and reception means connectable to the terminal equipment for performing data transmission and reception with the terminal equipment using a transmission signal;
• modem means, connectable to the transmission line, for determining a modulation technique used between said modem and the other modem by handsaking, for modulating the transmission signal using the modulation technique producing a modulated transmission signal, for transmitting the modulated transmission signal to the other modem, for demodulating a modulated reception signal which is received from the other modem and for outputting a reception signal and a communication speed determined from the modulation technique;
• data compression and decompression means, coupled between said data transmission and reception means and said modem means, for determining a compression technique used between said modem and the other modem by negotiation, for compressing data from said data transmission and reception means at a compression rate determined from the compression technique, for supplying the transmission signal received from said data transmission and reception means to said modem means, for decompressing the reception signal received from said modem means forming decompressed data, for supplying the decompressed data to said data transmission and reception means and for outputting the compression rata;
• and
• speed determining means, coupled to said modem means, said data compression and decompression means and said data transmission and reception means, for determining an optimum communication speed between said modem and the terminal equipment in response to the communication speed output from said modem means and the compression rata output from said data compression and decompression means, the optimum communication speed being determined when a communication between said modem and the other modem is established, and when the modulation and the data compression techniques are determined and said speed determining means for notifying the data transmission and reception means of the optimum communication speed, and
• said data transmission and reception means changing a speed of the data transmission and reception with the terminal equipment producing a data communication between the terminal equipment and the other terminal equipment using the optimum communication speed.