Editing Node-to-node data transfer (section)

{{more citations needed|date=July 2022}}
In [[telecommunications]], '''node-to-node data transfer'''<ref>{{Cite web |title=Node-to-Node Data Transfers |url=https://www.intel.com/content/www/us/en/develop/documentation/application-snapshot-user-guide/top/detailed-analyses/mpi-analyses/analysis-charts/node-to-node-data-transfers.html |access-date=2022-07-22 |website=Intel |language=en}}</ref> is the movement of data from one [[node (networking)|node]] of a [[Telecommunications network|network]] to the next. In the [[OSI model]] it is handled by the lowest two layers, the [[data link layer]] and the [[physical layer]].

In most communication systems, the transmitting point applies [[source coding]],<ref>{{Cite web |title=Information and Communication Theory Source Coding Techniques -PART -II Handbook on Source Coding Techniques -Part II |url=https://www.researchgate.net/publication/358285643}}</ref> followed by [[channel coding]], and lastly, [[line coding]]. This produces the [[baseband]] signal. The presence of filters may perform [[pulse shaping]]. Some systems then use [[modulation]] to multiplex many baseband signals into a [[broadband]] signal. The receiver un-does these transformations in reverse order: demodulation, trellis decoding, error detection and correction, decompression.

Some communication systems omit one or more of these steps, or use techniques that combine several of these steps together. For example, a [[Morse code]] transmitter combines source coding, channel coding, and line coding into one step, typically followed by an [[amplitude modulation]] step. [[Barcode]]s, on the other hand, add a checksum digit during channel coding, then translate each digit into a barcode symbol during line coding, omitting modulation.