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Protocol-control information

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In telecommunication, the term protocol-control information PCI has the following meanings:

1. The queries and replies among communications equipment to determine the respective capabilities of each end of the communications link.

2. For layered systems, information exchanged between entities of a given layer, via the service provided by the next lower layer, to coordinate their joint operation.

Public Domain This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 2022-01-22.

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