Line signaling is a class of telecommunications signaling protocols. In Telecommunication, signalling (UK spelling or signaling (US spelling has the following meanings The use of signals for controlling communications In Telecommunication, signalling (UK spelling or signaling (US spelling has the following meanings The use of signals for controlling communications In the field of Telecommunications, a communications protocol is the set of standard rules for data representation signaling authentication and error detection required to Line signaling is responsible for off-hook, ringing signal, answer, ground start, on-hook unidirectional supervision messaging in each direction from calling party to called party and vice versa. In Telephony, the term off-hook has the following meanings The condition that exists when a Telephone or other user instrument is in A ringtone or ring tone is the sound made by a Mobile phone to indicate an incoming call or text message In Telephony, a ground start or GST is a method of signaling from a terminal or subscriber Local loop to a Telephone exchange, in In Telephony, the term on-hook has the following meanings The condition that exists when a Telephone or other user instrument is not The calling party (also called caller, call originator or A-party) is a person who (or device that Initiates a Telephone call over The called party is a person who (or device that answers a Telephone call. After an off-hook, line signaling initiates register signaling to accomplish the exchange of telephone numbers of called party and in more modern line-signaling protocols, the calling party as well. In telecommunications register signaling is concerned with conveying addressing information such as the calling and/or called Telephone number. A telephone number or phone number is a sequence of numbers used to call from one Telephone line to another in a Telephone network. While register signaling occurs, line signaling remains quiescent unless the calling party goes on-hook or an abnormal cessation of the call occurs, such as due to equipment malfunction or shutdown or due to network outage upstream in that call-attempt's series of spanned trunks. A telecommunications network is a network of Telecommunications links and nodes arranged so that messages may be passed from one part of the network to another over
Line signaling can be conveyed in a single DS0 channel of a trunk. Digital Signal 0 ( DS0) is a basic Digital signaling rate of 64 Kbit/s, corresponding to the capacity of one Voice-frequency -equivalent This is about the network-design strategies for riding in auto cargo space see Trunking (auto, and for the UK term for electrical wireways see Electrical conduit#Trunking In modern PCM telecommunications, line signaling is represented by the ABCD bits in DS0 #16 of an E1 or a selected DS0 within a T1. In digital Telecommunications where a single physical wire pair can be used to carry many simultaneous voice conversations worldwide standards have been created and deployed
Line signaling can also be conveyed within the channels being supervised, as in the original T1 scheme which used one out of every eight bits for supervision, or with robbed bits of a superframe format, or as in-band signaling, e. Robbed-bit signaling ( RBS) is a specific type of Channel Associated Signaling in use in North America on T1 trunks and perhaps elsewhere in the world Super Frame is an older framing standard for T1s Also called D4 or D3/D4 framing See also Signalling (telecommunications In Telecommunications, in-band signaling is the sending of Metadata and control information in g. as in L1 signaling where 2280 Hz tone pulses are used.