in-band signaling - meaning and definition. What is in-band signaling
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What (who) is in-band signaling - definition

SENDING CONTROL FLOW INFORMATION IN THE SAME CHANNEL AS DATA
In-band signalling; In-band; Inband

in-band signaling         
in-band signalling         
<communications> (Or CAS, channel associated signaling) Transmission of control signals in the same channel as data. This is commonly used in the {Public Switched Telephone Network} where the same pair of wires carry both voice and control signals (e.g. dialling, ringing). Another example is the use on a computer serial line of Control-S and Control-Q characters for flow control as opposed to {hardware flow control} which would be out-of-band signalling. In digital communications, in-band signalling often uses "bit-robbing" where, for example, one bit in each frame is used for signalling instead of data. This is the reason why a D1 channel in the T-carrier system can only carry 56 Kbps of usable data instead of the 64 Kbps carried by the D0 channel in the E-carrier system. (2007-01-26)
Norwegian railway signaling         
RAIL TRAFFIC CONTROL SYSTEMS USED IN NORWAY
Norwegian railway signals; Norwegian railway signal; Norwegian railway signalling; Railway signaling in Norway
The signalling system used on the rail transport in Norway is regulated by the Regulations of December 4, 2001 no. 1336 about signals and signs on the state's railway network and connected private tracks.

Wikipedia

In-band signaling

In telecommunications, in-band signaling is the sending of control information within the same band or channel used for data such as voice or video. This is in contrast to out-of-band signaling which is sent over a different channel, or even over a separate network. In-band signals may often be heard by telephony participants, while out-of-band signals are inaccessible to the user. The term is also used more generally, for example of computer data files that include both literal data, and metadata and/or instructions for how to process the literal data.