A busy signal (or engaged tone) in telephony is an audible or visual signal to the calling party that indicates failure to complete the requested connection of that particular telephone call. A signal may refer to: an abstract element of information, or, more exactly, usually a flow of information (in either one or several dimensions). ... The person who (or device that) initiates a telephone call over the public switched telephone network is the calling party. ... The term connection (also rendered connexion - this alternative spelling is now generally considered old-fashioned, but it was the house style of The Times of London until at least the late 1970s) has various uses, including: An act of connecting two or more physical entities in a physical sense or... A telephone call is a connection over a telephone network between the calling party and the called party. ...
a reorder tone, (sometimes called a fast busy signal), indicates that no transmissionpath to the called number is available.
an otherwise unspecified busy signal indicates that the called number is occupied or otherwise unavailable
this tone sometimes occurs at the end of a call to indicate the other party has hung up.
Many different countries have different signalling tones that act as "busy signals". In communications, transmission is the act of transmitting electrical messages (and the associated phenonomena of radiant energy that pass through media). ... The word path has a variety of meanings: a path is a route between two points. ...
Federal Standard 1037C entitled Telecommunications: Glossary of Telecommunication Terms is a U.S. Federal Standard, issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended. ... MIL-STD-188 is a series of U.S. military standards relating to telecommunications. ...
Since a busysignal is included in the transmitting signal, the busysignal detecting circuit 507 of the second repeater 5b detects a busysignal and the busysignal detected signal is applied to the down counter 542.
The receiving direction detecting circuit 518 detects from which end of the power line with respect to the blocking filter 514 the transmitting signal was transmitted, based on determination by the receiving signal determining circuit 502 whether the modulation output is provided from either the first modem portion 515 or the second modem portion 517.
The busysignal generating circuit 516 is responsive to the determination output from the receiving direction detecting circuit 518 to generate a busysignal, which is transmitted from the second modem portion 517 on the other end side onto the power line 3.
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