Operating default group selectable data communication equipment
Apparatus for connecting data processing equipment to a communication network Patent #: 4868863
ApplicationNo. 582526 filed on 09/14/1990
US Classes:379/93.29, Reconfigurable379/93.05, Terminal interface circuitry379/399.02, Circuitry to provide a coder and decoder function379/441TERMINAL ACCESSORY OR AUXILIARY EQUIPMENT
ExaminersPrimary: Dwyer, James L.
Assistant: Chan, Wing F.
Attorney, Agent or Firm
Foreign Patent References
International ClassH04M 011/00
Foreign Application Priority Data1989-09-15 FR
AbstractA modem (200) for connecting a computer (100) or the like to a telephone network for data transmission purposes, the modem being of the type including a modulation/demodulation circuit for converting the digital signals of the computer into analog signals capable of being conveyed by the telephone network and vice versa, a computer interface circuit, and a telephone line interface circuit specially designed for a telephone network of a given type. The modem is characterized in that it comprises: a main circuit (210) designed to be placed inside the computer box (102) and incorporating the modulation/demodulation circuit (214) and the computer interface circuit (216); an auxiliary circuit (220) situated in a box (225) external to the computer box and incorporating the telephone line interface circuit; and disconnectable connection means (Cl, 230, 232) between the auxiliary circuit and the main circuit. The modem further includes means for at least periodically transferring an identification code from the auxiliary circuit to the main circuit, the identification code being stored in said auxiliary circuit and being representative of said given type of telephone network, means being provided in the main circuit for adapting the operating characteristics of said main circuit to said given type of network.