Cryptography – Key management – Having particular key generator
Patent
1985-11-18
1989-03-28
Cangialosi, Salvatore
Cryptography
Key management
Having particular key generator
379 98, 370 32, H04L 902
Patent
active
048171476
ABSTRACT:
An intelligent synchronous modem and data communication systems utilizing the intelligent synchronous modem are provided. The modem comprises: at least one connector having a first and a second port for primary and secondary channels of communication with a host computer, wherein the primary communication channel is for communication of synchronous data and the secondary communication channel is for communication of asynchronous data; a microprocessor for recognizing and executing commands of the host computer, wherein the commands are in the form of asynchronous data received over the secondary communication channel and interface means for interfacing the microprocessor with telephone lines, wherein synchronous data received by the microprocessor is sent to the interface means.
The data communication system of the invention comprises: a host computer including asynchronous and synchronous communication ports, wherein the host computer is arranged to send command mode data through the asynchronous port, and data mode data through the synchronous port; and intelligent synchronous modem as described above; at least one cable for connecting the synchronous port of the host computer with said synchronous port of the modem, and for connecting the asynchronous port of the host computer with the asynchronous port of the modem; and code/decode means for coding data received from the host computer into a synchronous format, and for decoding synchronous format data received from a second computer into data understandable by the host computer.
Preferably, the modem of the invention is arranged to permit the conversion of the modem from an intelligent synchronous modem into an intelligent asynchronous modem through the use of data path logic circuitry which is controlled by the microprocessor of the modem.
REFERENCES:
patent: 4091423 (1978-05-01), Branscome
patent: 4215243 (1980-07-01), Maxwell
patent: 4387440 (1983-06-01), Eaton
patent: 4494232 (1985-01-01), Dambrackas et al.
patent: 4547880 (1985-10-01), De Vita et al.
patent: 4549302 (1985-10-01), Heaterington
patent: 4620294 (1986-10-01), Leung et al.
Fargano Michael J.
Gorniak Andrew M.
Cangialosi Salvatore
General Datacomm, Inc.
Gordon David P.
Gregory Bernarr Earl
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