Subscriber line interface circuit

Details Subscriber line interface circuit Subscriber line interface circuit

1988-08-16

1989-09-12

Dwyer, James L.

Telephonic communications

Line equalization or impedance matching

379405, 379413, H04M 176, H04M 1900

Patent

active

048667676

ABSTRACT:
The subscriber line interface circuit comprises subscriber nodes, reception nodes and transmission nodes, a power feeding unit, adders, impedance elements, an inverting amplifier, and a feedback element. The subscriber nodes are coupled to a subscriber terminal via a subscriber line, and the reception and transmission nodes are coupled to an exchange via a reception line and a transmission line, respectively. The feeding unit supplied a DC current to the terminal and controls the current. The first adder adds the voltage between the subscriber nodes and the voltage from the reception node. The first impedance element has an impedance corresponding to a real-number multiplication of the impedance between the subscriber nodes, and is applied with the output voltage of the first adder. The amplifier is given with the output of the first impedance element. The second impedance element, inserted in the feedback path of the amplifier, has an impedance corresponding to a real-number multiplication of the impedances of the subscriber line and the terminal. The feedback element supplies, to the feeding unit, a signal corresponding to the current flowing through the first impedance element as a control signal. The second adder adds the output voltage of the amplifier, the output voltage of the first adder and the voltage of the reception nodes, and supplies the resultant signal to the transmission nodes.

REFERENCES:
patent: 4484032 (1984-11-01), Rosenbaum
patent: 4514595 (1985-04-01), Rosenbaum et al.
patent: 4600811 (1986-07-01), Hayashi et al.
Am 7950 Subscriber Line Interface Circuit, Advanced Information; Advanced Micro Devices, Inc., Jun. 1984.
Ericson Review, No. 4, pp. 192-200, 1983, "Line Circuit Component SLIC for AXE 10"; Arne Rydin and Jackie Sundvall.

Affiliated with

Also associated with

Rating

Subscriber line interface circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Subscriber line interface circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Subscriber line interface circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-923226