telecommunications Telecommunication, often used in its plural form or abbreviated as telecom, is the transmission of information over a distance using electronic means, typically through cables, radio waves, or other communication technologies. These means of ...

, the term protocol-control information (PCI) has the following meanings: # The queries and replies among

communication Communication is commonly defined as the transmission of information. Its precise definition is disputed and there are disagreements about whether Intention, unintentional or failed transmissions are included and whether communication not onl ...

s equipment to determine the respective capabilities of each end of the communications link. # For layered systems,

information Information is an Abstraction, abstract concept that refers to something which has the power Communication, to inform. At the most fundamental level, it pertains to the Interpretation (philosophy), interpretation (perhaps Interpretation (log ...

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

References

Reference models Telecommunications standards ISO standards ITU-T recommendations ITU-T X Series Recommendations {{telecom-stub