A geostationary satellite often provides a point-to-point connection between two locations on the ground (or in the air or on water).
Earth stations A and B in this illustration each transmit an independent signal through the uplink, and likewise receive the signal from the Earth station in the downlink.
The green and blue arrows represent separate transmissions by A and B, respectively, on different multiple-access channels of communication. Multiple access employs different frequencies, time slots, or codes.
In principle, each point to point link requires a separate pair of channels of communication.
Illustration of a Point-to-Point connection between two earth stations