A congestion-control technique in which a computer experiencing data traffic congestion sends a message back to the source of the messages or packets causing the congestion, requesting that the source stop transmitting.

The user providing the information to be transferred to a destination user during a particular information transfer transaction. Synonym information source.

SSM uses both the source and the group address to identify the session traffic as noted as (S,G). SSM-enabled protocols are able to differentiate between (SI, G) and (S2, G) as unique multicast groups allowing a group address to be reused by different multicast sources.

Service Provider

In telegraphy, one of the two significant conditions of encoding.
Note 1: The complementary significant condition is called a "mark. "
Note 2: In modern digital communications, the two corresponding significant conditions of encoding are called "zero" and "one. " Synonyms spacing pulse, spacing signal.

A method of transmission or reception, or both, in which the effects of fading are minimized by the simultaneous use of two or more physically separated antennas, ideally separated by one or more wavelengths.

A radiocommunication service concerned exclusively with the operation of spacecraft, in particular space tracking, space telemetry and space telecommand. These functions will normally be provided within the service in which the space station is operating. [NTIA] [RR] [47CFR]

Any radiocommunication involving the use of one or more space stations or the use of one or more reflecting satellites or other objects in space. [NTIA] [RR] [47CFR]

A radiocommunication service in which spacecraft or other objects in space are used for scientific or technological research purposes. [NTIA] [RR]

A station located on an object which is beyond, is intended to go beyond, or has been beyond, the major portion of the Earth's atmosphere. [NTIA] [RR] [47CFR]