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Class Information
Number: 370/273
Name: Multiplex communications > Quadruplex
Description: Subject matter for the simultaneous transmission of four messages, two in each direction over the same transmission medium.

Sub-classes under this class:

Class Number Class Name Patents
370/275 Duplex diplex 26
370/274 Repeater 59

Patents under this class:

Patent Number Title Of Patent Date Issued
8681840 Transceivers having loopback switches and methods of calibrating carrier leakage thereof Mar. 25, 2014
8654821 Method and circuit for fractional rate pulse shaping Feb. 18, 2014
8611451 Precoder coefficient optimization method and apparatus for communications systems Dec. 17, 2013
8588285 Method and apparatus for operating a digital subscriber line arrangement Nov. 19, 2013
8576898 SLOC spot monitoring Nov. 5, 2013
8537912 Extremely high speed broadband access over copper pairs Sep. 17, 2013
8514920 Methods and apparatus for pseudo asynchronous testing of receive path in serializer/deserializer devices Aug. 20, 2013
8503517 System and method of an in-band modem for data communications over digital wireless communication networks Aug. 6, 2013
8503515 High speed switch with data converter physical ports and processing unit Aug. 6, 2013
8503514 High speed switch with data converter physical ports Aug. 6, 2013
8477665 Method in a wireless repeater employing an antenna array for interference reduction Jul. 2, 2013
8457244 Antenna and radio arrangement Jun. 4, 2013
8446935 Method and circuit for fractional rate pulse shaping May. 21, 2013
8427983 Techniques for providing uplink feedback for downlink-only RF carriers in a multicarrier system Apr. 23, 2013
8396102 Transmitter and receiver for giga-bps high-throughput wireless communication system with multiple antennas and multiple bands Mar. 12, 2013
8340211 Methods and apparatus to encode bandwidth request message Dec. 25, 2012
8331430 Channel diagnostic systems and methods Dec. 11, 2012
8331478 Transmit diversity using low code rate spatial multiplexing Dec. 11, 2012
8331509 Method and device for cancelling transmitter interference in transceiver, and transceiver Dec. 11, 2012
8300711 Adaptive differential pulse code modulation/demodulation system and method Oct. 30, 2012
8290020 Frequency selection method to mitigate in-band interference from inter-modulation spur of the collocated radio transmitter Oct. 16, 2012
8275025 Methods and apparatus for pseudo asynchronous testing of receive path in serializer/deserializer devices Sep. 25, 2012
8259865 Methods and apparatus for adapting channel estimation in a communication system Sep. 4, 2012
8249134 High impedance state for digital subscriber line transceivers on copper pairs Aug. 21, 2012
8238450 Dynamic transmitter noise level adjustment for digital subscriber line systems Aug. 7, 2012
8204100 Methods and apparatuses for data transmission Jun. 19, 2012
8170166 Methods and systems for combining timing signals for transmission over a serial interface May. 1, 2012
8068537 Communication circuit for a bi-directional data transmission Nov. 29, 2011
8005132 Non-intrusive modem performance analysis Aug. 23, 2011
7907658 Systems and methods for resolving signal-to-noise ratio margin difference in dual latency discrete multi-tone-based xDSL systems under colored noise conditions Mar. 15, 2011
7116644 Data sharing and linkage for IP telephony set-top boxes Oct. 3, 2006
6771675 Method for facilitating simultaneous multi-directional transmission of multiple signals between multiple circuits using a single transmission line Aug. 3, 2004
5781772 Compressed prefix matching database searching Jul. 14, 1998
5636264 Radio telephone system which utilizes an infrared signal communication link Jun. 3, 1997

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