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

Introduced: September 1968

Description

Covers the transmission, routing, and processing of digital information over communication networks and systems. Encompasses telegraphic communication, data transmission protocols, network architectures, error detection and correction, signal modulation and coding, and digital signal processing for communication purposes. Includes technologies for packet switching, circuit switching, and modern data communication standards, but excludes specific applications in broadcast television (H04H), telephony systems (H04M), and radio communication (H04B).

Title

Titles differ between systems:

IPC: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION

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

Full Title

Full titles differ between systems:

IPC:

TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION

CPC:

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

Of 31 combined children, 23 exist in both systems.

7 codes are CPC-only extensions, 1 exist only in IPC.

Note: 6 CPC extensions are marked as secondary classification only.

10 shared codes have differing titles between IPC and CPC.

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