SELECTING

**Definition:** This place 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:

**Limiting references (this place does not cover):** - Electric switches; Relays; Selectors -> H01H - Wireless communication networks -> H04W

**Glossary:** - 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.