|
H04L 1/00
|
Arrangements for detecting or preventing errors in the information received |
|
H04L 1/02
|
Arrangements for detecting or preventing errors in the information received by diversity reception |
|
H04L 1/04
|
Arrangements for detecting or preventing errors in the information received by diversity reception using frequency diversity |
|
H04L 1/06
|
Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity |
|
H04L 1/08
|
Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system |
|
H04L 1/12
|
Arrangements for detecting or preventing errors in the information received by using return channel |
|
H04L 1/14
|
Arrangements for detecting or preventing errors in the information received by using return channel in which the signals are sent back to the transmitter to be checked |
|
H04L 1/16
|
Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals |
|
H04L 1/18
|
Automatic repetition systems, e.g. van Duuren system |
|
H04L 1/20
|
Arrangements for detecting or preventing errors in the information received using signal-quality detector |
|
H04L 1/22
|
Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability |
|
H04L 1/24
|
Testing correct operation |
|
H04L 5/00
|
Arrangements affording multiple use of the transmission path |
|
H04L 5/02
|
Channels characterised by the type of signal |
|
H04L 5/04
|
Channels characterised by the type of signal the signals being represented by different amplitudes or polarities, e.g. quadriplex |
|
H04L 5/06
|
Channels characterised by the type of signal the signals being represented by different frequencies |
|
H04L 5/08
|
Channels characterised by the type of signal the signals being represented by different frequencies each combination of signals in different channels being represented by a fixed frequency |
|
H04L 5/10
|
Channels characterised by the type of signal the signals being represented by different frequencies with mechanical filters or demodulators |
|
H04L 5/12
|
Channels characterised by the type of signal the signals being represented by different phase modulations of a single carrier |
|
H04L 5/14
|
Two-way operation using the same type of signal, i.e. duplex |
|
H04L 5/16
|
Half-duplex systems; Simplex/duplex switching; Transmission of break signals |
|
H04L 5/18
|
Automatic changing of the traffic direction |
|
H04L 5/20
|
Arrangements affording multiple use of the transmission path using different combinations of lines, e.g. phantom working |
|
H04L 5/22
|
Arrangements affording multiple use of the transmission path using time-division multiplexing |
|
H04L 5/24
|
Arrangements affording multiple use of the transmission path using time-division multiplexing with start-stop synchronous converters |
|
H04L 5/26
|
Arrangements affording multiple use of the transmission path using time-division multiplexing combined with the use of different frequencies |
|
H04L 7/00
|
Arrangements for synchronising receiver with transmitter |
|
H04L 7/02
|
Speed or phase control by the received code signals, the signals containing no special synchronisation information |
|
H04L 7/04
|
Speed or phase control by synchronisation signals |
|
H04L 7/06
|
Speed or phase control by synchronisation signals the synchronisation signals differing from the information signals in amplitude, polarity, or frequency |
|
H04L 7/08
|
Speed or phase control by synchronisation signals the synchronisation signals recurring cyclically |
|
H04L 7/10
|
Arrangements for initial synchronisation |
|
H04L 7/027
|
Speed or phase control by the received code signals, the signals containing no special synchronisation information extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit |
|
H04L 7/033
|
Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal- generating means, e.g. using a phase-locked loop |
|
H04L 9/00
|
Arrangements for secret or secure communication |
|
H04L 9/06
|
Arrangements for secret or secure communication the encryption apparatus using shift registers or memories for blockwise coding, e.g. D.E.S. systems |
|
H04L 9/08
|
Key distribution |
|
H04L 9/10
|
Arrangements for secret or secure communication with particular housing, physical features or manual controls |
|
H04L 9/12
|
Transmitting and receiving encryption devices synchronised or initially set up in a particular manner |
|
H04L 9/14
|
Arrangements for secret or secure communication using a plurality of keys or algorithms |
|
H04L 9/16
|
Arrangements for secret or secure communication using a plurality of keys or algorithms the keys or algorithms being changed during operation |
|
H04L 9/18
|
Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems |
|
H04L 9/20
|
Pseudorandom key sequence combined element-for-element with data sequence |
|
H04L 9/22
|
Pseudorandom key sequence combined element-for-element with data sequence with particular pseudorandom sequence generator |
|
H04L 9/24
|
Pseudorandom key sequence combined element-for-element with data sequence with particular pseudorandom sequence generator sequence produced by more than one generator |
|
H04L 9/26
|
Pseudorandom key sequence combined element-for-element with data sequence with particular pseudorandom sequence generator producing a nonlinear pseudorandom sequence |
|
H04L 9/28
|
Arrangements for secret or secure communication using particular encryption algorithm |
|
H04L 9/30
|
Public key, i.e. encryption algorithm being computationally infeasible to invert and users' encryption keys not requiring secrecy |
|
H04L 9/32
|
Arrangements for secret or secure communication including means for verifying the identity or authority of a user of the system |
|
H04L 9/34
|
Bits, or blocks of bits, of the telegraphic message being interchanged in time |
|
H04L 9/36
|
Arrangements for secret or secure communication with means for detecting characters not meant for transmission |
|
H04L 9/38
|
Encryption being effected by mechanical apparatus, e.g. rotating cams, switches, keytape punchers |
|
H04L 12/00
|
Data switching networks |
|
H04L 12/02
|
Data switching networks - Details |
|
H04L 12/04
|
Switchboards |
|
H04L 12/06
|
Answer-back mechanisms or circuits |
|
H04L 12/08
|
Allotting numbers to messages; Counting characters, words or messages |
|
H04L 12/10
|
Current supply arrangements |
|
H04L 12/12
|
Arrangements for remote connection or disconnection of substations or of equipment thereof |
|
H04L 12/14
|
Charging arrangements |
|
H04L 12/16
|
Arrangements for providing special services to substations |
|
H04L 12/18
|
Arrangements for providing special services to substations for broadcast or conference |
|
H04L 12/20
|
Arrangements for providing special services to substations for converting transmission speed from the inherent speed of a substation to the inherent speed of other substations |
|
H04L 12/22
|
Arrangements for preventing the taking of data from a data transmission channel without authorisation |
|
H04L 12/24
|
Arrangements for maintenance or administration |
|
H04L 12/26
|
Monitoring arrangements; Testing arrangements |
|
H04L 12/28
|
Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks] |
|
H04L 12/40
|
Bus networks |
|
H04L 12/42
|
Loop networks |
|
H04L 12/43
|
Loop networks with decentralised control with synchronous transmission, e.g. time division multiplex (TDM), slotted rings |
|
H04L 12/44
|
Star or tree networks |
|
H04L 12/46
|
Interconnection of networks |
|
H04L 12/50
|
Circuit switching systems, i.e. systems in which the path is physically permanent during the communication |
|
H04L 12/52
|
Circuit switching systems, i.e. systems in which the path is physically permanent during the communication using time division techniques |
|
H04L 12/54
|
Store-and-forward switching systems |
|
H04L 12/56
|
Packet switching systems |
|
H04L 12/58
|
Message switching systems |
|
H04L 12/60
|
Manual relay systems, e.g. push-button switching |
|
H04L 12/62
|
Manual relay systems, e.g. push-button switching with perforated tape storage |
|
H04L 12/64
|
Hybrid switching systems |
|
H04L 12/66
|
Arrangements for connecting between networks having differing types of switching systems, e.g. gateways |
|
H04L 12/70
|
Packet switching systems |
|
H04L 12/403
|
Bus networks with centralised control, e.g. polling |
|
H04L 12/407
|
Bus networks with decentralised control |
|
H04L 12/413
|
Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection (CSMA-CD) |
|
H04L 12/417
|
Bus networks with decentralised control with deterministic access, e.g. token passing |
|
H04L 12/423
|
Loop networks with centralised control, e.g. polling |
|
H04L 12/427
|
Loop networks with decentralised control |
|
H04L 12/433
|
Loop networks with decentralised control with asynchronous transmission, e.g. token ring, register insertion |
|
H04L 12/437
|
Ring fault isolation or reconfiguration |
|
H04L 12/701
|
Routing or path finding |
|
H04L 12/703
|
Route fault prevention or recovery, e.g. rerouting, route redundancy, virtual router redundancy protocol [VRRP] or hot standby router protocol [HSRP] |
|
H04L 12/705
|
Loop or livelock prevention, e.g. time to live [TTL] or spanning tree |
|
H04L 12/707
|
Route fault prevention or recovery, e.g. rerouting, route redundancy, virtual router redundancy protocol [VRRP] or hot standby router protocol [HSRP] using path redundancy |
|
H04L 12/709
|
Route fault prevention or recovery, e.g. rerouting, route redundancy, virtual router redundancy protocol [VRRP] or hot standby router protocol [HSRP] using path redundancy using M+N parallel active paths |
|
H04L 12/711
|
Route fault prevention or recovery, e.g. rerouting, route redundancy, virtual router redundancy protocol [VRRP] or hot standby router protocol [HSRP] using path redundancy using M:N active or standby paths |
|
H04L 12/713
|
Route fault prevention or recovery, e.g. rerouting, route redundancy, virtual router redundancy protocol [VRRP] or hot standby router protocol [HSRP] using node redundancy, e.g. VRRP |
|
H04L 12/715
|
Hierarchical routing, e.g. clustered networks or inter-domain routing |
|
H04L 12/717
|
Centralised routing |
|
H04L 12/721
|
Routing procedures, e.g. shortest path routing, source routing, link state routing or distance vector routing |
|
H04L 12/723
|
Label or tag based routing, e.g. multi-protocol label switching [MPLS] or generalised multi-protocol label switching [GMPLS] |
|
H04L 12/725
|
Selecting a path with suitable quality of service [QoS] |
|
H04L 12/727
|
Selecting a path with minimum delay |
|
H04L 12/729
|
Selecting a path with suitable bandwidth or throughput |
|
H04L 12/733
|
Selecting a path with minimum length or minimum hop count |
|
H04L 12/735
|
Disjoint routing, e.g. path disjoint or node disjoint |
|
H04L 12/741
|
Header address processing for routing, e.g. table lookup |
|
H04L 12/743
|
Header address processing for routing, e.g. table lookup using hashing techniques |
|
H04L 12/745
|
Header address processing for routing, e.g. table lookup using longest matching prefix |
|
H04L 12/747
|
Address caching |
|
H04L 12/749
|
Address processing over inter-domain or inter-network, e.g. mapping different addresses between IPv6 and IPv4 networks for routing |
|
H04L 12/751
|
Topology update or discovery |
|
H04L 12/753
|
Routing tree discovery, e.g. converting from mesh topology to tree topology |
|
H04L 12/755
|
Topology update consistency, e.g. link state advertisement [LSA], time stamping or sequence numbers in the updates |
|
H04L 12/757
|
Synchronised activation of routing updates, e.g. delaying or holding routing table updates |
|
H04L 12/759
|
Dynamic adaptation of update interval, e.g. event-driven updates |
|
H04L 12/761
|
Broadcast or multicast routing |
|
H04L 12/763
|
Shortcut routing, e.g. next hop resolution protocol [NHRP] |
|
H04L 12/771
|
Router architecture |
|
H04L 12/773
|
Router architecture for supporting layer 3 switching, e.g. IP switching, cell switch relay [CSR] or tag switching |
|
H04L 12/775
|
Router architecture multiple routing entities, e.g. multiple software or hardware instances |
|
H04L 12/781
|
Multiprotocol routing, e.g. for protocol adaptation between IPv4 and IPv6 or dual stack |
|
H04L 12/801
|
Flow control or congestion control |
|
H04L 12/803
|
Load balancing, e.g. traffic distribution over multiple links |
|
H04L 12/805
|
Determination of the optimum packet size, e.g. maximum transmission unit [MTU] |
|
H04L 12/807
|
Calculation or update of the congestion window |
|
H04L 12/811
|
Bitrate adaptation in active flows |
|
H04L 12/813
|
Policy-based control, e.g. policing |
|
H04L 12/815
|
Shaping |
|
H04L 12/819
|
Leaky bucket |
|
H04L 12/823
|
Packet dropping |
|
H04L 12/825
|
Adaptive control, at the source or intermediate nodes, upon congestion feedback, e.g. X-on X-off |
|
H04L 12/827
|
Adaptive control, at the source or intermediate nodes, upon congestion feedback, e.g. X-on X-off sent by intermediate network nodes |
|
H04L 12/829
|
Adaptive control, at the source or intermediate nodes, upon congestion feedback, e.g. X-on X-off sent by the destination endpoint |
|
H04L 12/833
|
Marking packets or altering packet priority upon congestion or for congestion prevention |
|
H04L 12/835
|
Bitrate adaptation in active flows using buffer capacity information at the endpoints or transit nodes |
|
H04L 12/841
|
Flow control actions using time consideration, e.g. round trip time [RTT] |
|
H04L 12/851
|
Traffic type related actions, e.g. QoS or priority |
|
H04L 12/853
|
Traffic type related actions, e.g. QoS or priority for real time traffic |
|
H04L 12/855
|
Traffic type related actions, e.g. QoS or priority for signalling traffic, e.g. operations, administration and maintenance [OAM] or acknowledge [ACK] packets |
|
H04L 12/857
|
Mapping QoS constraints between layers or between different networks |
|
H04L 12/859
|
Flow control actions based on the nature of the application, e.g. controlling web browsing or e-mail traffic |
|
H04L 12/861
|
Packet buffering or queuing arrangements; Queue scheduling |
|
H04L 12/863
|
Queue scheduling, e.g. Round Robin |
|
H04L 12/865
|
Priority-based scheduling |
|
H04L 12/867
|
Fair share scheduling |
|
H04L 12/869
|
Multilevel scheduling; Hierarchical scheduling |
|
H04L 12/873
|
Bandwidth-aware scheduling |
|
H04L 12/875
|
Delay-aware scheduling |
|
H04L 12/877
|
Distribution of residual bandwidth, e.g. distribution of unused bandwidth to best effort traffic [BET] |
|
H04L 12/879
|
Single buffer operations, e.g. buffer pointers or buffer descriptors |
|
H04L 12/883
|
Packet storage using a linked list of buffers |
|
H04L 12/885
|
Jitter compensation buffering |
|
H04L 12/891
|
Flow control of aggregated links or flows |
|
H04L 12/893
|
Connection splitting, e.g. IP splitting |
|
H04L 12/901
|
Ingress point selection by the source endpoint, e.g. Internet service provider [ISP] or point of presence [POP] selection |
|
H04L 12/903
|
Selection among a plurality of different networks |
|
H04L 12/905
|
Dynamic network selection or re-selection, e.g. after degradation of quality |
|
H04L 12/911
|
Network admission control and resource allocation, e.g. bandwidth allocation or in-call renegotiation |
|
H04L 12/913
|
Reservation actions involving intermediate nodes, e.g. resource reservation protocol [RSVP] |
|
H04L 12/915
|
Reservation actions involving several network domains, e.g. multilateral agreements or mapping of resources |
|
H04L 12/917
|
Dynamic resource allocation, e.g. in-call renegotiation requested by the user or upon changing network conditions requested by the network |
|
H04L 12/919
|
Dynamic resource allocation, e.g. in-call renegotiation requested by the user or upon changing network conditions requested by the network initiated by the source endpoint |
|
H04L 12/923
|
Dynamic resource allocation, e.g. in-call renegotiation requested by the user or upon changing network conditions requested by the network initiated by the network |
|
H04L 12/925
|
Reservation of resources at the destination endpoint |
|
H04L 12/927
|
Allocation of resources based on type of traffic, QoS or priority |
|
H04L 12/931
|
Switch fabric architecture |
|
H04L 12/933
|
Switch core, e.g. crossbar, shared memory or shared medium |
|
H04L 12/935
|
Switch interfaces, e.g. port details |
|
H04L 12/937
|
Switch control, e.g. arbitration |
|
H04L 12/939
|
Provisions for redundant switching, e.g. using parallel switching planes |
|
H04L 12/943
|
Transferring a complete packet or cell from each plane |
|
H04L 12/945
|
Transferring a part of the packet or cell from each plane, e.g. bit slice |
|
H04L 12/947
|
Address processing within a device, e.g. using internal ID or tags for routing within a switch |
|
H04L 12/951
|
Assembling and disassembling of packets, e.g. segmentation and reassembly [SAR] in asynchronous transfer mode [ATM] |
|
H04L 12/953
|
Packet sequencing arrangements for supporting message reassembly, e.g. packet sequence number |
|
H04L 12/955
|
Padding or de-padding, e.g. inserting or removing dummy data in or from unused packet segments |
|
H04L 13/00
|
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION - Details of the apparatus or circuits covered by groups or |
|
H04L 13/02
|
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION - Details of the apparatus or circuits covered by groups or - Details not particular to receiver or transmitter |
|
H04L 13/04
|
Driving mechanisms; Clutches |
|
H04L 13/06
|
Tape or page guiding or feeding devices |
|
H04L 13/08
|
Intermediate storage means |
|
H04L 13/10
|
Distributors |
|
H04L 13/12
|
Non-mechanical distributors, e.g. relay distributors |
|
H04L 13/14
|
Electronic distributors |
|
H04L 13/16
|
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION - Details of the apparatus or circuits covered by groups or of transmitters, e.g. code-bars, code-discs |
|
H04L 13/18
|
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION - Details of the apparatus or circuits covered by groups or of receivers |
|
H04L 15/00
|
Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code |
|
H04L 15/03
|
Keys structurally combined with sound generators |
|
H04L 15/04
|
Apparatus or circuits at the transmitting end |
|
H04L 15/06
|
Apparatus or circuits at the transmitting end with a restricted number of keys, e.g. separate key for each type of code element |
|
H04L 15/08
|
Apparatus or circuits at the transmitting end with a restricted number of keys, e.g. separate key for each type of code element with a single key which transmits dots in one position and dashes in a second position |
|
H04L 15/10
|
Apparatus or circuits at the transmitting end with a restricted number of keys, e.g. separate key for each type of code element combined with perforating apparatus |
|
H04L 15/12
|
Apparatus or circuits at the transmitting end with keyboard co-operating with code-bars |
|
H04L 15/14
|
Apparatus or circuits at the transmitting end with keyboard co-operating with code-bars combined with perforating apparatus |
|
H04L 15/16
|
Apparatus or circuits at the transmitting end with keyboard co-operating with code discs |
|
H04L 15/18
|
Automatic transmitters, e.g. controlled by perforated tape |
|
H04L 15/20
|
Automatic transmitters, e.g. controlled by perforated tape with optical sensing means |
|
H04L 15/22
|
Apparatus or circuits for sending one or a restricted number of signals, e.g. distress signals |
|
H04L 15/24
|
Apparatus or circuits at the receiving end |
|
H04L 15/26
|
Apparatus or circuits at the receiving end operating only on reception of predetermined code signals, e.g. distress signals, party-line call signals |
|
H04L 15/28
|
Code reproducing apparatus |
|
H04L 15/30
|
Writing recorders |
|
H04L 15/32
|
Perforating recorders |
|
H04L 15/34
|
Apparatus for recording received coded signals after translation, e.g. as type-characters |
|
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 |
|
H04L 17/02
|
Apparatus or circuits at the transmitting end |
|
H04L 17/04
|
Apparatus or circuits at the transmitting end with keyboard co-operating with code-bars |
|
H04L 17/06
|
Contact operating means |
|
H04L 17/08
|
Apparatus or circuits at the transmitting end with keyboard co-operating with code-bars combined with perforating apparatus |
|
H04L 17/10
|
Apparatus or circuits at the transmitting end with keyboard co-operating with code-discs |
|
H04L 17/12
|
Automatic transmitters, e.g. controlled by perforated tape |
|
H04L 17/14
|
Automatic transmitters, e.g. controlled by perforated tape with optical sensing means |
|
H04L 17/16
|
Apparatus or circuits at the receiving end |
|
H04L 17/18
|
Code selection mechanisms |
|
H04L 17/20
|
Apparatus or circuits at the receiving end using perforating recorders |
|
H04L 17/22
|
Apparatus or circuits at the receiving end using mechanical translation and type-bar printing |
|
H04L 17/24
|
Apparatus or circuits at the receiving end using mechanical translation and type-head printing, e.g. type-wheel, type-cylinder |
|
H04L 17/26
|
Apparatus or circuits at the receiving end using aggregate motion translation |
|
H04L 17/28
|
Apparatus or circuits at the receiving end using pneumatic or hydraulic translation |
|
H04L 17/30
|
Apparatus or circuits at the receiving end using electric or electronic translation |
|
H04L 19/00
|
Apparatus or local circuits for step-by-step systems |
|
H04L 21/00
|
Apparatus or local circuits for mosaic printer telegraph systems |
|
H04L 21/02
|
Apparatus or local circuits for mosaic printer telegraph systems at the transmitting end |
|
H04L 21/04
|
Apparatus or local circuits for mosaic printer telegraph systems at the receiving end |
|
H04L 23/00
|
Apparatus or local circuits for telegraphic systems other than those covered by groups |
|
H04L 23/02
|
Apparatus or local circuits for telegraphic systems other than those covered by groups adapted for orthogonal signalling |
|
H04L 25/00
|
Baseband systems |
|
H04L 25/02
|
Baseband systems - Details |
|
H04L 25/03
|
Shaping networks in transmitter or receiver, e.g. adaptive shaping networks |
|
H04L 25/04
|
Passive shaping networks |
|
H04L 25/05
|
Electric or magnetic storage of signals before transmitting or retransmitting for changing the transmission rate |
|
H04L 25/06
|
Dc level restoring means; Bias distortion correction |
|
H04L 25/08
|
Modifications for reducing interference; Modifications for reducing effects due to line faults |
|
H04L 25/10
|
Compensating for variations in line balance |
|
H04L 25/12
|
Compensating for variations in line impedance |
|
H04L 25/14
|
Channel dividing arrangements |
|
H04L 25/17
|
Interpolating arrangements |
|
H04L 25/18
|
Arrangements for inductively generating telegraphic signals |
|
H04L 25/20
|
Repeater circuits; Relay circuits |
|
H04L 25/22
|
Repeaters for converting two wires to four wires; Repeaters for converting single current to double current |
|
H04L 25/24
|
Relay circuits using discharge tubes or semiconductor devices |
|
H04L 25/26
|
Circuits with optical sensing means |
|
H04L 25/28
|
Repeaters using modulation and subsequent demodulation |
|
H04L 25/30
|
Non-synchronous systems |
|
H04L 25/32
|
Non-synchronous systems characterised by the code employed |
|
H04L 25/34
|
Non-synchronous systems characterised by the code employed using three or more different amplitudes, e.g. cable code |
|
H04L 25/38
|
Synchronous or start-stop systems, e.g. for Baudot code |
|
H04L 25/40
|
Transmitting circuits; Receiving circuits |
|
H04L 25/42
|
Transmitting circuits; Receiving circuits using mechanical distributors |
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H04L 25/44
|
Transmitting circuits; Receiving circuits using relay distributors |
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H04L 25/45
|
Transmitting circuits; Receiving circuits using electronic distributors |
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H04L 25/46
|
Transmitting circuits; Receiving circuits using tuning forks or vibrating reeds |
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H04L 25/48
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Transmitting circuits; Receiving circuits characterised by the code employed |
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H04L 25/49
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Transmitting circuits; Receiving circuits using three or more amplitude levels |
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H04L 25/52
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Repeater circuits; Relay circuits |
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H04L 25/54
|
Repeater circuits; Relay circuits using mechanical distributors |
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H04L 25/56
|
Non-electrical regenerative repeaters |
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H04L 25/58
|
Repeater circuits; Relay circuits using relay distributors |
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H04L 25/60
|
Regenerative repeaters with electromagnetic switches |
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H04L 25/62
|
Repeater circuits; Relay circuits using tuning forks or vibrating reeds |
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H04L 25/64
|
Start-stop regenerative repeaters using discharge tubes or semiconductor devices |
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H04L 25/66
|
Synchronous repeaters using discharge tubes or semiconductor devices |
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H04L 25/493
|
Transmitting circuits; Receiving circuits using three or more amplitude levels by transition coding, i.e. the time-position or direction of a transition being encoded before transmission |
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H04L 25/497
|
Transmitting circuits; Receiving circuits using three or more amplitude levels by correlative coding, e.g. partial response coding or echo modulation coding |
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H04L 27/00
|
Modulated-carrier systems |
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H04L 27/01
|
Equalisers |
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H04L 27/02
|
Amplitude-modulated carrier systems, e.g. using on/off keying; Single sideband or vestigial sideband modulation |
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H04L 27/04
|
Modulator circuits; Transmitter circuits |
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H04L 27/06
|
Demodulator circuits; Receiver circuits |
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H04L 27/08
|
Amplitude regulation arrangements |
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H04L 27/10
|
Frequency-modulated carrier systems, i.e. using frequency-shift keying |
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H04L 27/12
|
Modulator circuits; Transmitter circuits |
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H04L 27/14
|
Demodulator circuits; Receiver circuits |
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H04L 27/16
|
Frequency regulation arrangements |
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H04L 27/18
|
Phase-modulated carrier systems, i.e. using phase-shift keying |
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H04L 27/20
|
Modulator circuits; Transmitter circuits |
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H04L 27/22
|
Demodulator circuits; Receiver circuits |
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H04L 27/24
|
Half-wave signalling systems |
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H04L 27/26
|
Systems using multi-frequency codes |
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H04L 27/28
|
Systems using multi-frequency codes with simultaneous transmission of different frequencies each representing one code element |
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H04L 27/30
|
Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies |
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H04L 27/32
|
Carrier systems characterised by combinations of two or more of the types covered by groups , , , or |
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H04L 27/34
|
Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems |
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H04L 27/36
|
Modulator circuits; Transmitter circuits |
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H04L 27/38
|
Demodulator circuits; Receiver circuits |
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H04L 27/144
|
Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements |
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H04L 27/148
|
Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using filters, including PLL-type filters |
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H04L 27/152
|
Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using controlled oscillators, e.g. PLL arrangements |
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H04L 27/156
|
Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width |
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H04L 27/227
|
Demodulator circuits; Receiver circuits using coherent demodulation |
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H04L 27/233
|
Demodulator circuits; Receiver circuits using non-coherent demodulation |
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H04L 29/00
|
Arrangements, apparatus, circuits or systems, not covered by a single one of groups |
|
H04L 29/02
|
Communication control; Communication processing |
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H04L 29/04
|
Communication control; Communication processing for plural communication lines |
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H04L 29/06
|
Communication control; Communication processing characterised by a protocol |
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H04L 29/08
|
Transmission control procedure, e.g. data link level control procedure |
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H04L 29/10
|
Communication control; Communication processing characterised by an interface, e.g. the interface between the data link level and the physical level |
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H04L 29/12
|
Arrangements, apparatus, circuits or systems, not covered by a single one of groups characterised by the data terminal |
|
H04L 29/14
|
Counter-measures to a fault |
