H04J MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
Introduced: September 1968
Description
H04J covers multiplex communication systems and techniques that enable simultaneous transmission of multiple signals or information streams over a single communication channel or medium. This includes time-division multiplexing (TDM), frequency-division multiplexing (FDM), code-division multiplexing (CDM), and wavelength-division multiplexing (WDM), along with associated synchronization, signaling, and channel allocation methods. The classification encompasses technologies for telecommunications networks, data transmission systems, and integrated communication infrastructures where efficient bandwidth utilization through signal combining is essential. Related switching, routing, and network management aspects specific to multiplex systems are also included, distinguishing this from broader electrical communication techniques covered in H04.
Title
Titles differ between systems:
IPC: MULTIPLEX COMMUNICATION
CPC: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
Full Title
Full titles differ between systems:
MULTIPLEX COMMUNICATION
MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
Of 11 combined children, 9 exist in both systems.
2 codes are CPC-only extensions.
Note: 2 CPC extensions are marked as secondary classification only.
5 shared codes have differing titles between IPC and CPC.
Child Classifications
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- H04J 1/00 Frequency-division multiplex systems (H04J14/00 takes precedence) IPC+CPC Available in IPC and CPC
- H04J 11/00 Orthogonal multiplex systems, (H04J13/00 takes precedence) since 1974 +4 CPC IPC+CPC Available in IPC and CPC
- H04J 13/00 Code division multiplex systems (for frequency hopping H04B1/713) since 1974 +5 CPC IPC+CPC Available in IPC and CPC
- H04J 2203/00 Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07 2nd only +1 CPC CPC only CPC only
- H04J 2211/00 Orthogonal indexing scheme relating to orthogonal multiplex systems 2nd only +2 CPC CPC only CPC only
- H04J 3/00 Time-division multiplex systems (H04J14/00 takes precedence; relay systems H04B7/14; selecting techniques H04Q) IPC+CPC Available in IPC and CPC
- H04J 4/00 Combined time-division and frequency-division multiplex systems (H04J13/00 takes precedence ) since 1974 +1 CPC IPC+CPC Available in IPC and CPC
- H04J 7/00 Multiplex systems in which the amplitudes or durations of the signals in individual channels are characteristic of those channels IPC+CPC Available in IPC and CPC
- H04J 9/00 Multiplex systems in which each channel is represented by a different type of modulation of the carrier IPC+CPC Available in IPC and CPC
- H04J 99/00 Subject matter not provided for in other groups of this subclass since 2009 IPC+CPC Available in IPC and CPC