# US 4,395,596 A · Multi-line controller

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- Number: US 4,395,596 A
- Document ID: US4395596A
- Status: Granted
- Kind: A
- Application number: 06/313,541
- Filed: 1981-11-02
- Granted: 1983-07-26
- Earliest claimed: 1981-11-02
- Inventors: Harold N. Leitman; Walter J. Lange
- Web page: https://patentgrep.com/patent/US4395596A

## CPC

- H04M 9/002: {with subscriber controlled access to a line, i.e. key telephone systems}
- H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)

## Abstract

A multi-line controller device which provides lamp control and ringing control for single line telephone accessory equipment when connected to a multi-line telephone system. Control is selectively provided for any incoming line of the multi-line system through a combination of a multi-position switch and an opto-coupler device.

## Claims

### Claim 1

A multi-line controller for connecting single line telephone accessory equipment to a multi-line telephone system, comprising,
means for selectively connecting said single line telephone accessory equipment to a particular incoming line of sid multi-line telephone system, and
means operative when said single line telephone accessory equipment is connected to said particular line, and responsive to said single line equipment going off hook, for providing an A and A1 closure signal to the multi-line telephone system.

### Claim 2 (depends on 1)

A multi-line controller in accordance with claim 1 wherein said selective connecting means includes a multi-position switch.

### Claim 3 (depends on 1)

A multi-line controller in accordance with claim 1 wherein said providing means includes a diode bridge circuit connected in series with Tip and Ring leads extending to said single line accessory equipment, said diode bridge circuit providing a positive voltage potential when said single line equipment goes off hook, a light-emitting diode, to which said positive potential is applied, for providing a visible light source, a photo-resister, connected between A and A1 leads extending to said single line accesory equipment, said photo-resister decreasing in resistance in response to said visible light source to provide said A and A1 closure signal.