Technique for automatic identification of a remote modem

Details Technique for automatic identification of a remote modem Technique for automatic identification of a remote modem

1992-05-07

1994-05-10

Kuntz, Curits

Telephonic communications

Telephone line or system combined with diverse electrical...

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

375 8, H04M 1100, H04B 138

Patent

active

053115783

ABSTRACT:
In the public switched telephone network, an originating modem can identify an answering modem, e.g., as to the type of modem it is, by detection of a low-level identification signal sent from the answering modem. The low-level identification signal is hidden within an industry standard "answer tone," e.g., a CCITT V.25 answer tone of 2100 Hz. If the low-level identification signal is detected by the originating modem, the industry standard "handshaking" procedure is terminated and a non-standard handshaking procedure is implemented. If the identification signal is not detected by the originating modem, the industry standard handshaking procedure is simply completed.

REFERENCES:
patent: 4215243 (1980-07-01), Maxwell
patent: 4680773 (1987-07-01), Amundson
patent: 4782498 (1988-11-01), Copeland, III
patent: 4924456 (1990-05-01), Maxwell et al.
patent: 4931250 (1990-06-01), Greszczuk
patent: 5144651 (1992-09-01), Cooper

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