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IPC entry: H04L 5/06 2-dot subgroup [Version 2024.01 (current), Language EN - English]

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Symbol		Title
A		HUMAN NECESSITIES
B		PERFORMING OPERATIONS; TRANSPORTING
C		CHEMISTRY; METALLURGY
D		TEXTILES; PAPER
E		FIXED CONSTRUCTIONS
F		MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
G		PHYSICS
H		ELECTRICITY
H01		ELECTRIC ELEMENTS
H02		GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H03		ELECTRONIC CIRCUITRY
H04		ELECTRIC COMMUNICATION TECHNIQUE
H04B		TRANSMISSION [4]
H04H		BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N)
H04J		MULTIPLEX COMMUNICATION (peculiar to transmission of digital information H04L 5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N 7/08; in exchanges H04Q 11/00)
H04K		SECRET COMMUNICATION; JAMMING OF COMMUNICATION
H04L		TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) [4]
H04L 1/00		Arrangements for detecting or preventing errors in the information received [1, 2006.01]
H04L 5/00		Arrangements affording multiple use of the transmission path [1, 2006.01]
H04L 5/02		. Channels characterised by the type of signal [1, 2006.01]
H04L 5/04		. . the signals being represented by different amplitudes or polarities, e.g. quadriplex [1, 2006.01]
H04L 5/06		. . the signals being represented by different frequencies (combined with time-division multiplexing H04L 5/26) [1, 2006.01]
H04L 5/08		. . . each combination of signals in different channels being represented by a fixed frequency [1, 2006.01]
H04L 5/10		. . . with dynamo-electric generation of carriers; with mechanical filters or demodulators [1, 2006.01]
H04L 5/12		. . the signals being represented by different phase modulations of a single carrier [1, 2006.01]
H04L 5/14		. Two-way operation using the same type of signal, i.e. duplex [1, 2006.01]
H04L 5/16		. . Half-duplex systems; Simplex/duplex switching; Transmission of break signals [1, 2006.01]
H04L 5/18		. . Automatic changing of the traffic direction [1, 2006.01]
H04L 5/20		. using different combinations of lines, e.g. phantom working [1, 2006.01]
H04L 5/22		. using time-division multiplexing [1, 2006.01]
H04L 5/24		. . with start-stop synchronous converters [1, 2006.01]
H04L 5/26		. . combined with the use of different frequencies [1, 2006.01]
H04L 7/00		Arrangements for synchronising receiver with transmitter [1, 2006.01]
H04L 9/00		Arrangements for secret or secure communications; Network security protocols [1, 2006.01, 2022.01]
H04L 12/00		Data switching networks (interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units G06F 13/00) [5, 2006.01]
H04L 13/00		Details of the apparatus or circuits covered by groups H04L 15/00 or H04L 17/00 [1, 2006.01]
H04L 15/00		Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code (teaching apparatus therefor G09B; telegraph tapping keys H01H 21/86) [1, 2006.01]
H04L 17/00		Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code [1, 2006.01]
H04L 19/00		Apparatus or local circuits for step-by-step systems [1, 2006.01]
H04L 21/00		Apparatus or local circuits for mosaic printer telegraph systems [1, 2006.01]
H04L 23/00		Apparatus or local circuits for telegraphic systems other than those covered by groups H04L 15/00-H04L 21/00 [1, 2006.01]
H04L 25/00		Baseband systems [1, 2006.01]
H04L 27/00		Modulated-carrier systems [1, 2006.01]
H04L 41/00		Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks [2022.01]
H04L 43/00		Arrangements for monitoring or testing data switching networks [2022.01]
H04L 45/00		Routing or path finding of packets in data switching networks (routing or path finding in wireless networks H04W 40/00) [2022.01]
H04L 47/00		Traffic control in data switching networks (arrangements for detecting or preventing errors in the information received H04L 1/00) [2022.01]
H04L 49/00		Packet switching elements [2022.01]
H04L 51/00		User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail [2022.01]
H04L 61/00		Network arrangements, protocols or services for addressing or naming [2022.01]
H04L 65/00		Network arrangements, protocols or services for supporting real-time applications in data packet communication (real-time or near real-time messaging, e.g. instant messaging [IM] H04L 51/04; selective video distribution H04N 21/00) [2022.01]
H04L 67/00		Network arrangements or protocols for supporting network services or applications (user-to-user messaging H04L 51/00; network arrangements, protocols or services for supporting real-time applications in data packet communications networks H04L 65/00) [2022.01]
H04L 69/00		Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass (networks security protocols H04L 9/40; wireless communication networks H04W) [2022.01]
H04L 101/00		Indexing scheme associated with group H04L 61/00 [2022.01]
H04L 101/00		Indexing scheme associated with group H04L 61/00 [2022.01]
H04M		TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)
H04N		PICTORIAL COMMUNICATION, e.g. TELEVISION [4]
H04Q		SELECTING (switches, relays, selectors H01H; wireless communication networks H04W) [1, 2009.01]
H04R		LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) [6]
H04S		STEREOPHONIC SYSTEMS [3]
H04W		WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M 1/72) [2009.01]
H05		ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
H10		SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR [2023.01]
H99		SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01]

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