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PCE
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Search for IPC and CPC classification codes or keywords
DIFF Subgroup
H04B 3/46

Monitoring; Testing

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Line transmission systems > Details > Monitoring; Testing

CPC:

Line transmission systems (combined with near-field transmission systems H04B5/00) > Details > Monitoring; Testing

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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  • H04B 3/48 Testing attenuation (H04B3/466 takes precedence) IPC+CPC Available in IPC and CPC
  • H04B 3/487 Testing crosstalk effects since 2015 IPC+CPC Available in IPC and CPC
  • H04B 3/493 Testing echo effects or singing since 2015 IPC+CPC Available in IPC and CPC