(under the class definition) Subject matter for varying an electrical parameter of a telephone channel.
(1) Note. This subject matter is often included to bring a circuit value of a desired or standard value.
SEE OR SEARCH THIS CLASS, SUBCLASS:
22+, for diagnostic testing of a telephone transmission line.
381, for a make busy arrangement.
SEE OR SEARCH CLASS
174, Electricity: Conductors and Insulators, appropriate subclasses for a telephone conductor. 333, Wave Transmission Lines and Networks, appropriate subclasses for a load line.
