Browse Prior Art Database

Simultaneous Transmission of Master and Slave Channel Data

IP.com Disclosure Number: IPCOM000096367D
Original Publication Date: 1963-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 83K

Publishing Venue

IBM

Related People

Rumble, DH: AUTHOR

Abstract

The system transmits digital data from a master channel and simultaneously transmits in, e.g., a common microwave channel, data from a slave channel. This is whenever a transition does not occur in the master channel for at least three bit periods.

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 53% of the total text.

Page 1 of 3

Simultaneous Transmission of Master and Slave Channel Data

The system transmits digital data from a master channel and simultaneously transmits in, e.g., a common microwave channel, data from a slave channel. This is whenever a transition does not occur in the master channel for at least three bit periods.

Master channel data input pulses P are applied to pulse width modulator 10, e.g., a trigger circuit. This produces waves A having a transition only when a pulse P indicative of a 1 is applied to modulator 10. Waves A are delayed three bit periods, as indicated by waves B, in a three-bit delay 12 before they pass through Or 14 to differentiator 16. Such produces differentiated pulses C. After pulses C pass through Or 18 to transmitter 20, they are transmitted through the microwave link or channel to receiver 22. When an And gate and same-level- detector 24 detects three successive signals of the same signal level in the three- bit delay 12, a voltage is applied to And 26 to fully condition it. And 26 is initially partially conditioned by trigger 28. Since And 26 is now fully conditioned, a given pulse C, delayed by a one-bit delay 30, produces at the output of And 26 a control pulse D of the same polarity as that of the given pulse C. After passing through Or 18, the pulse D is applied to transmitter 20 in the bit period immediately following that of the given pulse C. Control Pulse D is also applied to wave shaper 27 producing pulses E which set trigger 28 to close And 26 and to initially condition an And 32. Pulses E also turn on clock 34. This is used to read out slave data stored in buffer 36.

The slave data from buffer 36 is applied to pulse width |modulator 38. Such is also coupled to transmitter 20 through Or 14, differentiator 16 and Or 18. Transmission of slave data from buffer 36 is terminated by a pulse F from the output of And 32. This turns off clock 34 and resets trigger 28. Pulse F is produced when level shift detector 40 senses a transition in the waves A which is applied to detector 40 through a one-bit delay 42. Pulse F from And 32 is also ap...