Simple modem log-on authentication

Details Simple modem log-on authentication Simple modem log-on authentication

1994-04-11

1995-08-08

Chan, Wing F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 98, 379 97, H04M 1100

Patent

active

054406170

ABSTRACT:
After receiving an answer tone from a receiver modem, a sender modem transmits a series of DTMF pulses of predetermined tone, duration, and spacing. If the receiver modem does not verify that the pulses have the correct tone, duration and spacing, it simply hangs up.

REFERENCES:
patent: 4672533 (1987-06-01), Noble et al.
patent: 4763351 (1988-08-01), Lipscher et al.
patent: 4905281 (1990-02-01), Surjaatmadja et al.
patent: 5131025 (1992-07-01), Hamasaki
patent: 5198806 (1993-03-01), Lord
patent: 5333152 (1994-07-01), Wilber

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