IPC Definitions - January 01, 2012

H04Q - Definition fr

Definition statement

This subclass covers:

Methods, circuits, or apparatus for selectively establishing a connection between a desired number of stations (normally two), or between a main station and a desired number of substations (normally one) for the purpose of transferring information via this connection after it has been established; and

Selective calling arrangements over connections already established.

As the scope of H04Q covers a diversity of subject matter, the user is referred to the IPC definitions for the main groups of H04Q.

The following list is intended to assist the user:

References relevant to classification in this subclass

This subclass does not cover:

Electric switches; Relays; Selectors

H01H

Multiplex communication

H04J

Wireless communication networks

H04W

Informative references

Attention is drawn to the following places, which may be of interest for search:

Cables; Conductors

H01B

Installation of communication cables or lines

H02G

Electronic switches

H03K 17/00

Transmission in general

H04B

Broadcast communication

H04H

Transmission of digital information

H04L

Telephonic communication

H04M

Glossary of terms

In this subclass, the following terms or expressions are used with the meaning indicated:

Satellite

A kind of exchange the operation of which depends upon control signals received from a supervisory exchange.

Subscriber

General term for terminal equipment, e.g. telephone for public use.

Substation

Subscriber or monitoring equipment which may connect a single subscriber to a line without choice as to subscriber.

Switching centres

Include exchanges and satellites.