Multi-mode modem for automatically switching between data transm

Details Multi-mode modem for automatically switching between data transm Multi-mode modem for automatically switching between data transm

1992-04-16

1994-10-04

Chan, Wing F.

Telephonic communications

Telephone line or system combined with diverse electrical...

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

375 8, 375114, H04M 1100

Patent

active

053533380

ABSTRACT:
A modem including an identification signal detection section for detecting a specific identification signal during data transmission, a mode switching section for switching the mode from data transmit mode to control command accept mode when the identification signal is detected singly, and an identification signal deleting section for deleting one identification signal from the transmit data when successive identification signals are detected. During data transmission, the mode can be switched over to the control command accept mode by sending a specific identification signal from the data terminal equipment.

REFERENCES:
patent: 3825905 (1974-07-01), Allen, Jr.
patent: 4549302 (1985-10-01), Heatherington
patent: 4700358 (1987-10-01), Duncanson et al.
patent: 4926448 (1990-05-01), Kraul et al.
patent: 5107518 (1992-04-01), Petty, Jr.

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