Quick Answer: Why Uplink Frequency Is More Than Downlink?

In Cisco Switch, Uplink is used to describe a wireless connection that is made from a Local Area Network (LAN) to a Wide Area Network (WAN).

It can also be referred to as a port that is used to connect toward the core of the network.

Downlink, on the other hand, is the direct opposite of uplink..

The uplink frequency is the frequency which is used for transmission of signals from earth station transmitter to the satellite. The downlink frequency is the frequency which is used for transmission of signals from the satellite to the earth station receiver.

What is meant by frequency reuse?

Frequency Reuse is the scheme in which allocation and reuse of channels throughout a coverage region is done. Each cellular base station is allocated a group of radio channels or Frequency sub-bands to be used within a small geographic area known as a cell.


GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA. WiMAX and LTE use OFDM. Time-division multiple access (TDMA) provides multiuser access by chopping up the channel into sequential time slices.

What frequency is used for mobile communication?

In North America, GSM operates on the primary mobile communication bands 850 MHz and 1900 MHz. In Canada, GSM-1900 is the primary band used in urban areas with 850 as a backup, and GSM-850 being the primary rural band. In the United States, regulatory requirements determine which area can use which band.

What frequency does NASA use?

One of the frequencies we use is the same NASA used to beam TV signals from the Moon. That’s called S band (2–4 GHz), but we also use X band (8–12 GHz) and the Ka band (27–40 GHz). The earliest widely used DSN frequency was S band.

Uplink. In satellite telecommunication, a downlink is the link from a satellite down to one or more ground stations or receivers, and an uplink is the link from a ground station up to a satellite. Basically any signal from the ground to satellite can be known as Uplink.

Answer: Uplink frequency is kept higher than Downlink frequency for the following reasons: At higher frequency attenuation is more hence more power will be required for signal transmission to ensure that it reaches the destination with the required minimum power.

What are the 3 types of satellites?

Types of Satellites and ApplicationsCommunications Satellite.Remote Sensing Satellite.Navigation Satellite.Geocentric Orbit type staellies – LEO, MEO, HEO.Global Positioning System (GPS)Geostationary Satellites (GEOs)Drone Satellite.Ground Satellite.More items…

x Band Satellite Communication operates in the part of the X band or Super High Frequency (SHF) spectrum which is designated by the International Telecommunication Union (ITU) for satellite communication, which is those frequencies in the range 7.25 GHz to 7.75 GHz (Space to Earth) and 7.9 GHz to 8.4 GHz (Earth to …

GSM-900 and GSM-1800 are used in most parts of the world. GSM-900 uses 890 – 915 MHz to send information from 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 to 124) spaced at 200 kHz.

Uplink frequency is the frequency at which, the first earth station is communicating with satellite. The satellite transponder converts this signal into another frequency and sends it down to the second earth station. This frequency is called as Downlink frequency.

Uplink speed is the speed at which data can be transferred from the router to your ISP. This is determined by your ISP. ISPs often specify speed as a downlink/uplink pair; for example, 1.5Mbps/284kbps. … Alternatively you can test your uplink speed with a service such as www.dslreports.com.

LTE works on two different types of air interfaces (radio links), one is downlink (from tower to device), and one is uplink (from device to tower). … For the uplink, LTE uses the DFTS-OFDMA (discrete Fourier transform spread orthogonal frequency division multiple access) scheme to generate a SC-FDMA signal.

What frequencies do satellites use?

Satellite frequency bandsL-band (1–2 GHz) Global Positioning System (GPS) carriers and also satellite mobile phones, such as Iridium; Inmarsat providing communications at sea, land and air; WorldSpace satellite radio. … C-band (4–8 GHz) … X-band (8–12 GHz) … Ku-band (12–18 GHz) … Ka-band (26–40 GHz)

Uplink. … Traffic and signalling flowing within the BSS and NSS may also be identified as uplink and downlink. Pertaining to computer networks, an uplink is a connection from data communications equipment toward the network core. This is also known as an upstream connection.

Why is high frequency used in satellite communication?

The high frequency radio waves used for telecommunications links travel by line of sight and so are obstructed by the curve of the Earth. The purpose of communications satellites is to relay the signal around the curve of the Earth allowing communication between widely separated geographical points.

The downlink frequency is the frequency which is used for transmission of signals from the satellite to the earth station receiver. … The satellite transmitter generates a signal that would jam its own receiver; if both uplink and downlink shared the same frequency.

In order to avoid interference, the satellite must have distinct uplink and downlink frequencies. The satellite receives the signal on one frequency and it transmits on another frequency, the reason is to avoid the interference of signals. … To obtain clear transmission, the frequency must be distinct between them.

Is GSM digital or analog?

2G networks developed as a replacement for first generation (1G) analog cellular networks. The GSM standard originally described a digital, circuit-switched network optimized for full duplex voice telephony. … “GSM” is a trade mark owned by the GSM Association.

How high are satellites in the sky?

approximately 35,786 kmGeosynchronous orbit (GSO): Orbits with an altitude of approximately 35,786 km (22,236 mi). Such a satellite would trace an analemma (figure 8) in the sky.