Protocol-control information
From Wikipedia, the free encyclopedia
In telecommunication, the term protocol-control information or 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.
This article contains material from the Federal Standard 1037C, which, as a work of the United States Government, is in the public domain.
