The signals used to operate the communications channel are separate from the user's data channel. ISDN uses out-of-band signaling via the D channel.
Signaling transmismitted using frequencies or channels outside the frequencies or channels normally used for information transfer. Out-of-band signaling often is used for error reporting in situations in which in-band signaling can be affected by whatever problems the network might be experiencing. (source)
Information about the state of a network or device carried outside the normal data paths using a separate channel, often a serial line, i.e., allowing a LAN device to report a malfunction or linebreak. See In-band signaling.
Signaling that is separated from the channel carrying the information and sent over an independent ("out of band") channel.
An exchange access signaling feature which allows customers to exchange call control and signaling information over a communication path that is separate from the message path.
Signaling that uses a portion of the channel bandwidth provided by the transmission medium, e.g., the carrier channel, which portion is above the highest frequency used by, and is denied to, the speech or intelligence path by filters.
Use of a separate data link which is not in the voice circuit to transmit call set-up and automatic number identification (ANI) information from carrier-to-carrier, or from carrier to customer.
Refers to signaling methods where signaling information is carried by a separate channel. In addition to technical advantages, out-of-band signaling helps prevent unauthorized tampering with the network. See also in-band signaling.
Telecommunications signaling on a channel dedicated for that purpose and separate from the channels used for the telephone call itself. Out-of-band signaling is the method used in SS7, the latest standard for the signaling that controls the world's telephone calls.
Signaling in which the conversation and the signaling take place over different paths. A separate digital channel (called a signaling link) is created, where messages are exchanged between network elements at 56Kbps or 64Kbps. Out-of-band signals run no danger of interference from speech or data, which allows signaling to take place during the conversation. However, the out-of-band signal needs extra bandwidth and extra electronics to handle the signaling band.
n. Transmission of some signals, such as control information, on frequencies outside of the bandwidth available for voice or data transfer on a communications channel.