Browse Prior Art Database

Optical Signal Connection

IP.com Disclosure Number: IPCOM000049541D
Original Publication Date: 1982-Jun-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Leak, DD: AUTHOR

Abstract

Communications line 1 is connected to a terminal 2 by an optical plug 3, employing light emitting diode (LED)-phototransistor pairs. Terminal 2 includes a socket 4 for receiving plug 3. An LED 5, in socket 4, is aligned with a phototransistor 6 of plug 3. Similarly, an LED 7 of plug 3 is aligned with phototransistor 8 of the socket 4. When plug 3 is positioned in socket 4, LED 5 communicates with phototransistor 6 for one-way communications and LED 7 communicates with phototransistor 8 for communications in the opposite direction. Appropriate circuitry in both the terminal 2 and plug 3 converts the electrical signals required for the LEDs and produced by the phototransistors into the electrical signals which would be directly communicated in a conventional electrical communication system.

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Optical Signal Connection

Communications line 1 is connected to a terminal 2 by an optical plug 3, employing light emitting diode (LED)-phototransistor pairs. Terminal 2 includes a socket 4 for receiving plug 3. An LED 5, in socket 4, is aligned with a phototransistor 6 of plug 3. Similarly, an LED 7 of plug 3 is aligned with phototransistor 8 of the socket 4. When plug 3 is positioned in socket 4, LED 5 communicates with phototransistor 6 for one-way communications and LED 7 communicates with phototransistor 8 for communications in the opposite direction. Appropriate circuitry in both the terminal 2 and plug 3 converts the electrical signals required for the LEDs and produced by the phototransistors into the electrical signals which would be directly communicated in a conventional electrical communication system.

When plug 3 is removed from socket 4, LED 5 is capable of communicating to phototransistor 8, thus allowing terminal 2 to wrap its communications simply by unplugging plug 3. By employing the circuits shown, phototransistor 6 can be shielded when plug 3 is removed from socket 4, thereby leaving the connection of communication cable 1 unbroken so as not to affect the operation of other terminals on the communications loop.

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