Communication terminal system

Details Communication terminal system Communication terminal system

1991-02-05

1992-10-06

Tarcza, Thomas H.

Cryptography

Cryptanalysis

380 4, H01K 900

Patent

active

051539179

ABSTRACT:
The invention provides an improved communication terminal system which basically works only in an on-line state, that is, when it is connected with a host computer; but, which is also workable for a pre-determined time period even in an off-line state. The communication terminal system includes a terminal unit, measuring means for counting working frequency or time of the terminal unit, and control means for detecting disconnection from the host computer and controlling the terminal unit. The control means activates the counting means when it detects disconnection of the communication lines. The control means then disables the terminal unit when it detects that working frequency or time of the terminal unit amounts to a value previously set on the measuring means.

REFERENCES:
patent: 4937862 (1990-06-01), Kosich
patent: 4941175 (1990-06-01), Enescu et al.
patent: 5032979 (1991-07-01), Hecht et al.

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