IPC-Stelle: H04L 5/04 [Version 7 (gültig ab 01.2000)]

SymbolTypTitel
HSKELECTRICITY
H04KLELECTRIC COMMUNICATION TECHNIQUE
H04LUKLTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (typewriters B41J; order telegraphs, fire or police telegraphs G08B; visual telegraphy G08B , G08C; teleautographic systems G08C; ciphering or deciphering apparatus per se G09C; coding, decoding or code conversion, in general H03M; arrangements common to telegraphic and telephonic communication H04M; selecting H04Q) [4]
H04L 1/00HGRArrangements for detecting or preventing errors in the information received (correcting synchronisation H04L 7/00; arrangements in the transmission path H04B)
H04L 1/02UGR1
.by diversity reception (in general H04B 7/02)
H04L 1/04UGR2
. .using frequency diversity
H04L 1/06UGR2
. .using space diversity
H04L 1/08UGR1
.by repeating transmission, e.g. Verdan system
H04L 1/12UGR1
.by using return channel
H04L 1/14UGR2
. .in which the signals are sent back to the transmitter to be checked
H04L 1/16UGR2
. .in which the return channel carries supervisory signals, e.g. repetition request signals
H04L 1/18UGR3
. . .Automatic repetition systems, e.g. van Duuren system
H04L 1/20UGR1
.using signal-quality detector [3]
H04L 1/22UGR1
.using redundant apparatus to increase reliability [3]
H04L 1/24UGR1
.Testing correct operation [3]
H04L 5/00HGRArrangements affording multiple use of the transmission path (multiplex communication in general H04J)
H04L 5/02UGR1
.Channels characterised by the type of signal
H04L 5/04UGR2
. .the signals being represented by different amplitudes or polarities, e.g. quadriplex
H04L 5/06UGR2
. .the signals being represented by different frequencies (combined with time-division multiplexing H04L 5/26)
H04L 5/08UGR3
. . .each combination of signals in different channels being represented by a fixed frequency
H04L 5/10UGR3
. . .with dynamo-electric generation of carriers; with mechanical filters or demodulators
H04L 5/12UGR2
. .the signals being represented by different phase modulations of a single carrier
H04L 5/14UGR1
.Two-way operation using the same type of signal, i.e. duplex (conditioning for two-way transmission in general H04B 3/20)
H04L 5/16UGR2
. .Half-duplex systems; Simplex/duplex switching; Transmission of break signals
H04L 5/18UGR2
. .Automatic changing of the traffic direction
H04L 5/20UGR1
.using different combinations of lines, e.g. phantom working
H04L 5/22UGR1
.using time-division multiplexing
H04L 5/24UGR2
. .with start-stop synchronous converters
H04L 5/26UGR2
. .combined with the use of different frequencies
H04L 7/00HGRArrangements for synchronising receiver with transmitter
H04L 7/02UGR1
.Speed or phase control by the received code signals, the signals containing no special synchronisation information
H04L 7/027UGR2
. .extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit [5]
H04L 7/033UGR2
. .using the transitions of the received signal to control the phase of the synchronising-signal- generating means, e.g. using a phase-locked loop [5]
H04L 7/04UGR1
.Speed or phase control by synchronisation signals
H04L 7/06UGR2
. .the synchronisation signals differing from the information signals in amplitude, polarity, or frequency
H04L 7/08UGR2
. .the synchronisation signals recurring cyclically
H04L 7/10UGR2
. .Arrangements for initial synchronisation
H04L 9/00HGRArrangements for secret or secure communication (spread spectrum techniques in general H04B 1/69)
H04L 9/06UGR1
.the encryption apparatus using shift registers or memories for blockwise coding, e.g. D.E.S. systems [5]
H04L 9/08UGR2
. .Key distribution [5]
H04L 9/10UGR1
.with particular housing, physical features or manual controls [5]
H04L 9/12UGR1
.Transmitting and receiving encryption devices synchronised or initially set up in a particular manner [5]
H04L 9/14UGR1
.using a plurality of keys or algorithms [5]
H04L 9/16UGR2
. .the keys or algorithms being changed during operation [5]
H04L 9/18UGR1
.Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems [5]
H04L 9/20UGR2
. .Pseudorandom key sequence combined element-for-element with data sequence [5]
H04L 9/22UGR3
. . .with particular pseudorandom sequence generator [5]
H04L 9/24UGR4
. . . .sequence produced by more than one generator [5]
H04L 9/26UGR4
. . . .producing a nonlinear pseudorandom sequence [5]
H04L 9/28UGR1
.using particular encryption algorithm [5]
H04L 9/30UGR2
. .Public key, i.e. encryption algorithm being computationally infeasible to invert and users' encryption keys not requiring secrecy [5]
H04L 9/32UGR1
.including means for verifying the identity or authority of a user of the system (computer systems G06F; coin-freed or like apparatus with coded identity card or credit card G07F 7/08) [5]
H04L 9/34UGR1
.Bits, or blocks of bits, of the telegraphic message being interchanged in time [5]
H04L 9/36UGR1
.with means for detecting characters not meant for transmission [5]
H04L 9/38UGR1
.Encryption being effected by mechanical apparatus, e.g. rotating cams, switches, keytape punchers [5]
H04L 12/00HGRData switching networks (interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units G06F 13/00) [5]
H04L 12/02UGR1
.Details [5]
H04L 12/04UGR2
. .Switchboards [5]
H04L 12/06UGR2
. .Answer-back mechanisms or circuits [5]
H04L 12/08UGR2
. .Allotting numbers to messages; Counting characters, words or messages [5]
H04L 12/10UGR2
. .Current supply arrangements [5]
H04L 12/12UGR2
. .Arrangements for remote connection or disconnection of substations or of equipment thereof [5]
H04L 12/14UGR2
. .Charging arrangements [5]
H04L 12/16UGR2
. .Arrangements for providing special services to substations [5]
H04L 12/18UGR3
. . .for broadcast or conference [5]
H04L 12/20UGR3
. . .for converting transmission speed from the inherent speed of a substation to the inherent speed of other substations [5]
H04L 12/22UGR2
. .Arrangements for preventing the taking of data from a data transmission channel without authorisation (means for verifying the identity or the authority of a user of a secure or secret communication system H04L 9/32) [5]
H04L 12/24UGR2
. .Arrangements for maintenance or administration [5]
H04L 12/26UGR2
. .Monitoring arrangements; Testing arrangements [5]
H04L 12/28UGR1
.characterised by path configuration, e.g. local area networks (LAN), wide area networks (WAN) [5, 6]
H04L 12/40UGR2
. .Bus networks [5, 6]
H04L 12/403UGR3
. . .with centralised control, e.g. polling [6]
H04L 12/407UGR3
. . .with decentralised control [6]
H04L 12/413UGR4
. . . .with random access, e.g. carrier-sense multiple-access with collision detection (CSMA-CD) [6]
H04L 12/417UGR4
. . . .with deterministic access, e.g. token passing [6]
H04L 12/42UGR2
. .Loop networks [5, 6]
H04L 12/423UGR3
. . .with centralised control, e.g. polling [6]
H04L 12/427UGR3
. . .with decentralised control [6]
H04L 12/43UGR4
. . . .with synchronous transmission, e.g. time division multiplex (TDM), slotted rings [6]
H04L 12/433UGR4
. . . .with asynchronous transmission, e.g. token ring, register insertion [6]
H04L 12/437UGR3
. . .Ring fault isolation or reconfiguration [6]
H04L 12/44UGR2
. .Star or tree networks [5, 6]
H04L 12/46UGR2
. .Interconnection of networks [5, 6]
H04L 12/50UGR1
.Circuit switching systems, i.e. systems in which the path is physically permanent during the communication [5, 6]
H04L 12/52UGR2
. .using time division techniques (in digital transmission systems H04L 5/22) [5, 6]
H04L 12/54UGR1
.Stored and forward switching systems [5, 6]
H04L 12/56UGR2
. .Packet switching systems [5, 6]
H04L 12/58UGR2
. .Message switching systems (permutation- code selecting H04Q 3/02) [5, 6]
H04L 12/60UGR3
. . .Manual relay systems, e.g. push-button switching [5, 6]
H04L 12/62UGR4
. . . .with perforated tape storage [5, 6]
H04L 12/64UGR1
.Hybrid switching systems [5, 6]
H04L 12/66UGR1
.Arrangements for connecting between networks having differing types of switching systems, e.g. gateways [5, 6]
H04L 13/00HGRDetails of the apparatus or circuits covered by groups H04L 15/00 or H04L 17/00
H04L 13/02UGR1
.Details not particular to receiver or transmitter
H04L 13/04UGR2
. .Driving mechanisms; Clutches (in general F16)
H04L 13/06UGR2
. .Tape or page guiding or feeding devices
H04L 13/08UGR2
. .Intermediate storage means
H04L 13/10UGR2
. .Distributors
H04L 13/12UGR3
. . .Non-mechanical distributors, e.g. relay distributors
H04L 13/14UGR4
. . . .Electronic distributors (in general H03K 17/00)
H04L 13/16UGR1
.of transmitters, e.g. code-bars, code-discs
H04L 13/18UGR1
.of receivers
H04L 15/00HGRApparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code (teaching apparatus therefor G09B; keyboard switches in general H01H 13/70 , H03K 17/94; telegraph tapping keys H01H 21/86; coding in connection with keyboards or like devices, in general H03M 11/00)
H04L 15/03UGR1
.Keys structurally combined with sound generators [2]
H04L 15/04UGR1
.Apparatus or circuits at the transmitting end
H04L 15/06UGR2
. .with a restricted number of keys, e.g. separate key for each type of code element
H04L 15/08UGR3
. . .with a single key which transmits dots in one position and dashes in a second position
H04L 15/10UGR3
. . .combined with perforating apparatus
H04L 15/12UGR2
. .with keyboard co-operating with code-bars
H04L 15/14UGR3
. . .combined with perforating apparatus
H04L 15/16UGR2
. .with keyboard co-operating with code discs
H04L 15/18UGR2
. .Automatic transmitters, e.g. controlled by perforated tape
H04L 15/20UGR3
. . .with optical sensing means
H04L 15/22UGR2
. .Apparatus or circuits for sending one or a restricted number of signals, e.g. distress signals
H04L 15/24UGR1
.Apparatus or circuits at the receiving end
H04L 15/26UGR2
. .operating only on reception of predetermined code signals, e.g. distress signals, party-line call signals
H04L 15/28UGR2
. .Code reproducing apparatus
H04L 15/30UGR3
. . .Writing recorders
H04L 15/32UGR3
. . .Perforating recorders
H04L 15/34UGR2
. .Apparatus for recording received coded signals after translation, e.g. as type-characters
H04L 17/00HGRApparatus 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 (keyboard switches in general H01H 13/70 , H03K 17/94; coding in connection with keyboards or like devices, in general H03M 11/00)
H04L 17/02UGR1
.Apparatus or circuits at the transmitting end
H04L 17/04UGR2
. .with keyboard co-operating with code-bars
H04L 17/06UGR3
. . .Contact operating means
H04L 17/08UGR3
. . .combined with perforating apparatus
H04L 17/10UGR2
. .with keyboard co-operating with code-discs
H04L 17/12UGR2
. .Automatic transmitters, e.g. controlled by perforated tape
H04L 17/14UGR3
. . .with optical sensing means
H04L 17/16UGR1
.Apparatus or circuits at the receiving end
H04L 17/18UGR2
. .Code selection mechanisms
H04L 17/20UGR2
. .using perforating recorders
H04L 17/22UGR2
. .using mechanical translation and type-bar printing
H04L 17/24UGR2
. .using mechanical translation and type-head printing, e.g. type-wheel, type-cylinder
H04L 17/26UGR2
. .using aggregate motion translation
H04L 17/28UGR2
. .using pneumatic or hydraulic translation
H04L 17/30UGR2
. .using electric or electronic translation
H04L 19/00HGRApparatus or local circuits for step-by-step systems
H04L 21/00HGRApparatus or local circuits for mosaic printer telegraph systems
H04L 21/02UGR1
.at the transmitting end
H04L 21/04UGR1
.at the receiving end
H04L 23/00HGRApparatus or local circuits for systems other than those covered by groups H04L 15/00 to H04L 21/00
H04L 23/02UGR1
.adapted for orthogonal signalling [2]
H04L 25/00HGRBaseband systems
H04L 25/02UGR1
.Details (circuits in general for handling pulses H03K; in line transmission systems in general H04B 3/02)
H04L 25/03UGR2
. .Shaping networks in transmitter or receiver, e.g. adaptive shaping networks (impedance networks per se H03H) [2]
H04L 25/04UGR3
. . .Passive shaping networks [2]
H04L 25/05UGR2
. .Electric or magnetic storage of signals before transmitting or retransmitting for changing the transmission rate [7]
H04L 25/06UGR2
. .Dc level restoring means; Bias distortion correction
H04L 25/08UGR2
. .Modifications for reducing interference; Modifications for reducing effects due to line faults
H04L 25/10UGR2
. .Compensating for variations in line balance
H04L 25/12UGR2
. .Compensating for variations in line impedance
H04L 25/14UGR2
. .Channel dividing arrangements
H04L 25/17UGR2
. .Interpolating arrangements [4]
H04L 25/18UGR2
. .Arrangements for inductively generating telegraphic signals (induction coil interrupters H01H 51/34; dynamo-electric generators H02K)
H04L 25/20UGR2
. .Repeater circuits; Relay circuits
H04L 25/22UGR3
. . .Repeaters for converting two wires to four wires (in general H04B); Repeaters for converting single current to double current
H04L 25/24UGR3
. . .Relay circuits using discharge tubes or semiconductor devices
H04L 25/26UGR3
. . .Circuits with optical sensing means
H04L 25/28UGR3
. . .Repeaters using modulation and subsequent demodulation
H04L 25/30UGR1
.Non-synchronous systems
H04L 25/32UGR2
. .characterised by the code employed
H04L 25/34UGR3
. . .using three or more different amplitudes, e.g. cable code
H04L 25/36GEL(transferred to H04L 25/05)
H04L 25/38UGR1
.Synchronous or start-stop systems, e.g. for Baudot code
H04L 25/40UGR2
. .Transmitting circuits; Receiving circuits (repeater circuits, relay circuits H04L 25/52)
H04L 25/42UGR3
. . .using mechanical distributors
H04L 25/44UGR3
. . .using relay distributors
H04L 25/45UGR3
. . .using electronic distributors (electronic distributors in general H03K 17/00) [2]
H04L 25/46UGR3
. . .using tuning forks or vibrating reeds
H04L 25/48UGR3
. . .characterised by the code employed (H04L 25/49 takes precedence) [2]
H04L 25/49UGR3
. . .using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels [2]
H04L 25/493UGR4
. . . .by transition coding, i.e. the time-position or direction of a transition being encoded before transmission [3]
H04L 25/497UGR4
. . . .by correlative coding, e.g. partial response coding or echo modulation coding [3]
H04L 25/50GEL(transferred to H04L 25/05)
H04L 25/52UGR2
. .Repeater circuits; Relay circuits
H04L 25/54UGR3
. . .using mechanical distributors
H04L 25/56UGR3
. . .Non-electrical regenerative repeaters
H04L 25/58UGR3
. . .using relay distributors
H04L 25/60UGR3
. . .Regenerative repeaters with electromagnetic switches
H04L 25/62UGR3
. . .using tuning forks or vibrating reeds
H04L 25/64UGR3
. . .Start-stop regenerative repeaters using discharge tubes or semiconductor devices
H04L 25/66UGR3
. . .Synchronous repeaters using discharge tubes or semiconductor devices
H04L 27/00HGRModulated-carrier systems
H04L 27/01UGR1
.Equalisers [5]
H04L 27/02UGR1
.Amplitude-modulated carrier systems, e.g. using on/off keying; Single sideband or vestigial sideband modulation (H04L 27/32 takes precedence) [2, 5]
H04L 27/04UGR2
. .Modulator circuits (in general H03C); Transmitter circuits
H04L 27/06UGR2
. .Demodulator circuits (in general H03D); Receiver circuits
H04L 27/08UGR2
. .Amplitude regulation arrangements
H04L 27/10UGR1
.Frequency-modulated carrier systems, i.e. using frequency-shift keying (H04L 27/32 takes precedence) [5]
H04L 27/12UGR2
. .Modulator circuits (in general H03C); Transmitter circuits
H04L 27/14UGR2
. .Demodulator circuits (in general H03D); Receiver circuits
H04L 27/144UGR3
. . .with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements [6]
H04L 27/148UGR4
. . . .using filters, including PLL-type filters [6]
H04L 27/152UGR4
. . . .using controlled oscillators, e.g. PLL arrangements [6]
H04L 27/156UGR3
. . .with demodulation using temporal properties of the received signal, e.g. detecting pulse width [6]
H04L 27/16UGR2
. .Frequency regulation arrangements
H04L 27/18UGR1
.Phase-modulated carrier systems, i.e. using phase-shift keying (H04L 27/32 takes precedence) [5]
H04L 27/20UGR2
. .Modulator circuits (in general H03C); Transmitter circuits
H04L 27/22UGR2
. .Demodulator circuits (in general H03D); Receiver circuits
H04L 27/227UGR3
. . .using coherent demodulation [6]
H04L 27/233UGR3
. . .using non-coherent demodulation [6]
H04L 27/24UGR2
. .Half-wave signalling systems
H04L 27/26UGR1
.Systems using multi-frequency codes (H04L 27/32 takes precedence) [5]
H04L 27/28UGR2
. .with simultaneous transmission of different frequencies each representing one code element
H04L 27/30UGR2
. .wherein each code element is represented by a combination of frequencies
H04L 27/32UGR1
.Carrier systems characterised by combinations of two or more of the types covered by groups H04L 27/02 , H04L 27/10 , H04L 27/18 , or H04L 27/26 [5]
H04L 27/34UGR2
. .Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems [5]
H04L 27/36UGR3
. . .Modulator circuits; Transmitter circuits [5]
H04L 27/38UGR3
. . .Demodulator circuits; Receiver circuits [5]
H04L 29/00HGRArrangements, apparatus, circuits or systems, not covered by a single one of groups H04L 1/00 to H04L 27/00 (interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units G06F 13/00) [5]
H04L 29/02UGR1
.Communication control; Communication processing (H04L 29/12 , H04L 29/14 take precedence) [5]
H04L 29/04UGR2
. .for plural communication lines [5]
H04L 29/06UGR2
. .characterised by a protocol [5]
H04L 29/08UGR3
. . .Transmission control procedure, e.g. data link level control procedure [5]
H04L 29/10UGR2
. .characterised by an interface, e.g. the interface between the data link level and the physical level [5]
H04L 29/12UGR1
.characterised by the data terminal [5]
H04L 29/14UGR1
.Counter-measures to a fault [5]