Skip to content
PCE
Search Classifications
Search for IPC and CPC classification codes or keywords
DIFF Subgroup
H04L 12/42

Loop networks

Introduced: January 1990

Full Title

Full titles differ between systems:

IPC:

Data switching networks > characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks] > Loop networks

CPC:

Data switching networks (interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units G06F13/00) > characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks] (wireless communication networks H04W ) > Loop networks

Of 5 combined children, 3 exist in both systems.

2 codes are CPC-only extensions.

Note: 1 CPC extensions are marked as secondary classification only.

IPC defines codes here since 1995.

Child Classifications

Navigate with arrow keys, Enter to open

  • H04L 12/422 CPC only CPC only
  • H04L 12/423 with centralised control, e.g. polling since 1995 IPC+CPC Available in IPC and CPC
  • H04L 12/437 Ring fault isolation or reconfiguration since 1995 IPC+CPC Available in IPC and CPC
  • H04L 2012/421 2nd only CPC only CPC only