Multiplex communications – Wide area network – Packet switching
Patent
1986-10-01
1988-08-30
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
H04J 300
Patent
active
047681918
ABSTRACT:
A digital data and orderwire combiner employs a first and a second inverting gate amplifiers. The first amplifier receives the orderwire signal which is a low rate digital signal, while the second amplifier receives the data signal which is of a higher rate. The amplifiers have a common ground return where current through the amplifiers is directed through a resistive impedance network. The amplifiers as coupled together providing a 3-level amplitude modulated signal indicative of the combined data and orderwire signal. In order to reduce jitter, a portion of one of the signals is directed from one amplifier to the other. The configuration assure low jitter operation while producing reliable voltage levels indicative of 3-level amplitude modulation.
REFERENCES:
patent: 3943284 (1976-03-01), Nelson
ITT Corporation, Defense Communications Division
Jung Min
Olms Douglas W.
Twomey Thomas N.
Walsh Robert A.
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