Q.Distinguish between uplink and down link signals.

In a satellite link the signal travels up to the satellite and then back down to Earth, and the two directions are given different names and different frequencies. …

[!TLDR]

Uplink = Earth-to-satellite signal; downlink = satellite-to-Earth signal, and the downlink uses a lower frequency.

A satellite communication link works in two directions. The signal sent from the Earth station up to the satellite is called the uplink. The satellite receives this signal, amplifies it and translates it to a different frequency, then retransmits it back to the receiving Earth station; this returning signal is called the downlink. The downlink frequency is usually lower than the uplink frequency: in the widely used C-band system the uplink is typically about 6 GHz and the down …