Pulse-address multiple access
Encyclopedia
In telecommunications, pulse-address multiple access (PAMA) is a channel access method
that enables the ability of a communication satellite
to receive signals from several Earth terminals simultaneously and to amplify, translate, and relay
the signals back to Earth, based on the addressing of each station by an assignment
of a unique combination of time
and frequency
slots.
This ability may be restricted by allowing only some of the terminals access
to the satellite at any given time.
Channel access method
In telecommunications and computer networks, a channel access method or multiple access method allows several terminals connected to the same multi-point transmission medium to transmit over it and to share its capacity...
that enables the ability of a communication satellite
Satellite
In the context of spaceflight, a satellite is an object which has been placed into orbit by human endeavour. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as the Moon....
to receive signals from several Earth terminals simultaneously and to amplify, translate, and relay
Relay
A relay is an electrically operated switch. Many relays use an electromagnet to operate a switching mechanism mechanically, but other operating principles are also used. Relays are used where it is necessary to control a circuit by a low-power signal , or where several circuits must be controlled...
the signals back to Earth, based on the addressing of each station by an assignment
Assignment
'Assignment may refer to:* Assignment , a type of modification to a variable* Assignment , a task given to students by their teachers to be completed out of the class time....
of a unique combination of time
Time
Time is a part of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change such as the motions of objects....
and frequency
Frequency
Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency.The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency...
slots.
This ability may be restricted by allowing only some of the terminals access
Access control
Access control refers to exerting control over who can interact with a resource. Often but not always, this involves an authority, who does the controlling. The resource can be a given building, group of buildings, or computer-based information system...
to the satellite at any given time.