Browse Prior Art Database

Point to Point Communication

IP.com Disclosure Number: IPCOM000093376D
Original Publication Date: 1967-Sep-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Pilost, D: AUTHOR

Abstract

This arrangement provides duplex channelling over one coaxial cable by use of pulse transformers and threshold logic.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Point to Point Communication

This arrangement provides duplex channelling over one coaxial cable by use of pulse transformers and threshold logic.

Data pulses, fed to the line by drivers E1 and E2, have the same polarity. However, due to their opposite directions of propagation and to the winding of the line transformer used, the pulses coming from E2 are fed to the receiver R2 input with a reversed polarity. Pulses coming from E1 are fed to R2 input without polarity reversal. By use of threshold logic, the R2 output is insensitive to any information provided by E2. A similar arrangement allows receiver R1 to be only sensitive to data from E2.

In order to avoid cancellation of information, if coincident pulses, travelling in opposite directions, appear simultaneously in any line transformer primary, transformer T1 is doubled by T'1 while T2 is doubled by T'2 , lambda m/2 apart where lambda m= minimum wavelength of data signals. No information is missing if signals from T'1 are passed through delay line D1 and then ORed in R1 with signals from T1 for receiver R1, while signals from T2 are passed through delay line D2 and then ORed with signals from T'2 in receiver R2.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]