Data station termination circuit

Details Data station termination circuit Data station termination circuit

1986-12-01

1988-09-13

George, Keith E.

Telephonic communications

Telephone line or system combined with diverse electrical...

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

379402, 379442, H04M 1100

Patent

active

047714492

ABSTRACT:
A data station termination circuit for connecting a four-wire, voice frequency transmission facility to either a four-wire or two-wire subscriber station in a telephone communication system for effecting a four-wire or two-wire mode of operation includes a gain/loss network coupled to a receive-in port for receiving incoming voice frequency data signals from a first signal transmission path of the four-wire transmission facility and for amplifying or attenuating the incoming voice frequency data signals. The gain/loss network is formed of a single operational amplifier, a set of binary weighted resistors, and a plurality of single-pole, single-throw slide switches. Other features disclosed include a battery back-up for use during a loopback condition and an optional equalization network for use in a second signal transmission path.

REFERENCES:
patent: 3943301 (1976-03-01), Ervin
patent: 4037065 (1977-07-01), Nahay
patent: 4419756 (1983-12-01), Cheng-Quispe et al.
patent: 4598172 (1986-07-01), Eriksson
patent: 4607139 (1986-08-01), Froment et al.

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