Protocol-control information

In telecommunications, the term protocol-control information (PCI) has the following meanings:[1][2][3][4]

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.

## References

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1. ^ "CCITT X.200 – Information technology – Reference Model of Open Systems Interconnection for CCITT Applications". International Telecommunication Union (ITU). 1988.
2. ^ Boait, P.; Neville, G.; Norris, R.; Pickman, M.; Walmsley, J. (1988). "Definition of OSI Terms" (PDF). In Tolhurst, M. (ed.). Open Systems Interconnection. Macmillan Computer Science Series. London: Palgrave. doi:10.1007/978-1-349-10306-5. ISBN 978-0-333-46803-6. Archived (PDF) from the original on 2022-10-09.
3. ^ "ITU-T X.260 | ISO/IEC 14765 – Information technology – Framework for protocol identification and encapsulation". International Telecommunication Union (ITU). 1996.
4. ^ "Federal Standard 1037C – Telecommunications: Glossary of Telecommunication Terms". General Services Administration – Information Technology Service. 1996.

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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