TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

Child Classifications

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• H04L 1/00 Arrangements for detecting or preventing errors in the information received +5 CPC IPC+CPC Available in IPC and CPC
• H04L 101/00 Indexing scheme associated with group since 2022 −2 IPC IPC only IPC only
• H04L 12/00 Data switching networks (interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units G06F13/00) since 1990 IPC+CPC Available in IPC and CPC
• H04L 13/00 Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00 IPC+CPC Available in IPC and CPC
• 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 H01H21/86) IPC+CPC Available in IPC and CPC
• 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 IPC+CPC Available in IPC and CPC
• H04L 19/00 Apparatus or local circuits for step-by-step systems IPC+CPC Available in IPC and CPC
• H04L 21/00 Apparatus or local circuits for mosaic printer telegraph systems IPC+CPC Available in IPC and CPC
• H04L 2101/00 Indexing scheme associated with group H04L61/00 2nd only +2 CPC CPC only CPC only
• H04L 2201/00 Algorithms used for the adjustment of time-domain equalizers 2nd only +4 CPC CPC only CPC only
• H04L 2203/00 Characteristics of phase shift key signals 2nd only +2 CPC CPC only CPC only
• H04L 2209/00 Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00 2nd only +21 CPC CPC only CPC only
• H04L 2212/00 Encapsulation of packets 2nd only CPC only CPC only
• H04L 23/00 Apparatus or local circuits for systems other than those covered by groups H04L15/00 - H04L21/00 IPC+CPC Available in IPC and CPC
• H04L 2463/00 Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00 2nd only +15 CPC CPC only CPC only
• H04L 25/00 Baseband systems −1 IPC IPC+CPC Available in IPC and CPC
• H04L 27/00 Modulated-carrier systems +7 CPC IPC+CPC Available in IPC and CPC
• H04L 41/00 Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks since 2022 +5 CPC IPC+CPC Available in IPC and CPC
• H04L 43/00 Arrangements for monitoring or testing data switching networks since 2022 +1 CPC IPC+CPC Available in IPC and CPC
• H04L 45/00 Routing or path finding of packets in data switching networks (routing or path finding in wireless networks H04W40/00) since 2022 +17 CPC IPC+CPC Available in IPC and CPC
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