Communications System The communication going from a satellite to ground iscalled downlink, and when it is going from ground to a satellite itis called uplink. When an uplink is being received bythe spacecraft at the same time a downlink is being received byEarth, the communication is called two-way.

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Also to know is, what is uplink transmitter?

It consists of Uplink Transmitter, Satellite Linkand Downlink Receiver, which can be conveniently placed in thelaboratory. The Satellite can be placed at an elevated, position ifneeded. The Transponder receives signal from UplinkTransmitter and retransmits at different frequencies to aDownlink Receiver.

Furthermore, what is uplink and downlink in GSM? GSM-900 and GSM-1800 GSM-900 uses 890 - 915 MHz to send informationfrom the Mobile Station to the Base Transceiver Station(uplink) and 935 - 960 MHz for the other direction(downlink), providing 124 RF channels (channel numbers 1 to124) spaced at 200 kHz. Duplex spacing of 45 MHz isused.

Keeping this in view, why is uplink and downlink frequency different?

It say basically the power at ground stations is more ascompared to power available at satellites.So generallyfrequency for uplink is kept higher than thedownlink. There is greater attenuation due to rain when thesignal frequency is high.so downlink is also kept atlower frequency.

What is difference between uplink and downlink?

The communication going from a satellite to ground iscalled downlink, and when it is going from ground to asatellite it is called uplink. When an uplink isbeing received by the spacecraft at the same time a downlinkis being received by Earth, the communication is calledtwo-way.

Related Question Answers

What is down link?

In satellite telecommunication, a downlink is thelink from a satellite down to one or more groundstations or receivers, and an uplink is the link from aground station up to a satellite. A company can specialize inproviding uplinks, downlinks, or both.

What is the purpose of an uplink port on a switch?

Uplink Port Definition An uplink port is a special port (i.e.,connector) on a network switch or hub that reverses thetransmit and receive circuits of any twisted pair cable connectedto it. Its purpose is to allow the direct connection of twolike devices (i.e., two hubs, two switches or twocomputers).

What is antenna definition?

Definition of antenna. 1 pluralantennae : one of a pair of slender, movable, segmentedsensory organs on the head of insects, myriapods, and crustaceans— see insect illustration. 2 : a usually metallic device(such as a rod or wire) for radiating or receiving radio waves a TVantenna.

What is meant by uplink and downlink in networking?

A downlink is a connection made in the oppositedirection of an uplink, either from a satellite to theground or from an outside network into a localnetwork. Cellular and other wireless broadband serviceproviders sometimes refer to the upstream communication path of anetwork as uplink transmission.

What is the range of downlink frequency of satellite communication?

Ku-band (12–18 GHz) Used for satellite communications. In Europe,Ku-band downlink is used from 10.7 GHz to 12.75 GHz fordirect broadcast satellite services, such asAstra.

What is the frequency range of mobile communication?

In North America, GSM operates on the primary mobilecommunication bands 850 MHz and 1900 MHz.

What is GSM module and how it works?

The SIM card mounted GSM modem upon receivingdigit command by SMS from any cell phone send that data to the MCthrough serial communication. While the program is executed, theGSM modem receives command 'STOP' to develop an output atthe MC, the contact point of which are used to disable the ignitionswitch.