Apparatus for electrically isolating a telephone line from a dat

Details Apparatus for electrically isolating a telephone line from a dat Apparatus for electrically isolating a telephone line from a dat

1992-12-17

1994-11-29

Kuntz, Curtis

Telephonic communications

Telephone line or system combined with diverse electrical...

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

379 93, 375 8, H04M 1100

Patent

active

053696875

ABSTRACT:
A data access arrangement circuit (60) for supplying electrical isolation between a telephone line (11) and a data device, such as a data terminal or a computer, connected to a modem (10). An isolation circuit (17) connected between a first modem circuit (15) having a transmitter (19), a receiver (20), and a controller (18), and a second modem circuit (16) connected to the telephone line (11), couples signals between the first modem circuit (15) and the second modem circuit (16), thereby electrically isolating the first modem circuit (15) from the second modem circuit (16). The second modem circuit (16) conditions an incoming analog telephone signal received via the telephone line (11) to supply an incoming digital data signal to the receiver (20). The second modem circuit (16) further conditions an outgoing digital data signal received from the transmitter (19) to supply an outgoing analog telephone signal for transmission over the telephone line (11). The isolation circuit (17) couples the incoming data signal, the outgoing data signal, and control signals between the second modem circuit (16) and the first modem circuit (15) while electrically isolating the second modem circuit (16) from the first modem circuit (15) A first power source (21) supplies operating power to the first modem circuit (15) and a second power source (22) draws power only from the telephone line (11) to supply operating power to the second modem circuit (16). Electrical isolation between the first modem circuit (15) and the second modem circuit (16) is maintained by the use of these separate power sources.

REFERENCES:
patent: 4373117 (1983-02-01), Pierce
patent: 4395590 (1983-07-01), Pierce et al.
patent: 4417099 (1983-11-01), Pierce
patent: 4500754 (1985-02-01), Mackey
patent: 4578533 (1986-03-01), Pierce
patent: 4592069 (1986-05-01), Reeding
patent: 5086454 (1992-02-01), Hirzel
patent: 5224154 (1993-06-01), Aldridge et al.

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