A public link is a link that uses the public switched telephone network or other public utility or entity to provide the link and which may also be accessible by anyone.A private link is a link that is either owned by a specific entity or a link that is only accessible by a specific entity.Links are often referred to by terms that refer to the ownership or accessibility of the link. Any transmission of data that originates from the central CE is received by all of the peripheral CEs while any transmission of data that originates from any of the peripheral CEs is only received by the central CE. Unlike broadcast links, there is no mechanism to efficiently send a single message to all other nodes without copying and retransmitting the message.Ī point-to-multipoint link (or simply a multipoint) is a specific type of multipoint link which consists of a central connection endpoint (CE) that is connected to multiple peripheral CEs. Also known as general topology networks, these include ATM and Frame Relay links, as well as X.25 networks when used as links for a network layer protocol like IP. Classic Ethernet is an example.Īlso known as a multidrop link, a multipoint link is a link that connects two or more nodes. Sometimes the communications facilities that provide the communication channel that constitutes a link are also included in the definition of link.Ī point-to-point link is a dedicated link that connects exactly two communication facilities (e.g., two nodes of a network, an intercom station at an entryway with a single internal intercom station, a radio path between two points, etc.).īroadcast links connect two or more nodes and support broadcast transmission, where one node can transmit so that all other nodes can receive the same transmission.
The term link is widely used in computer networking to refer to the communications facilities that connect nodes of a network. The link may be a dedicated physical link or a virtual circuit that uses one or more physical links or shares a physical link with other telecommunications links.Ī telecommunications link is generally based on one of several types of information transmission paths such as those provided by communication satellites, terrestrial radio communications infrastructure and computer networks to connect two or more points. In a telecommunications network, a link is a communication channel that connects two or more devices for the purpose of data transmission. Click here to learn more about uplink.Communication channel between two or more devices The transmission of signals from the user's device to the network is called uplink. In wireless networks, ‘downlink' is also used to indicate other terms related to downlink transmissions like downlink channels, downlink frame structures, downlink packets etc. A company may specialize in providing downlink services, uplink services or both. Some companies sell uplink and downlink services to television stations, corporations and other telecommunication carriers. An RF device called a downconverter is used to convert an RF frequency to a baseband frequency for receptions on the downlink side. Satellite networks also use 11.7-12.2 GHz (Ku-Band) and 17.7-21.2 GHz (Ka-band) for downlink. In satellite C-Band communications 3700-4200 MHz is the downlink band. For example, GSM cellular networks use the 935 MHz to 960 MHz band for downlink transmission. Most technologies have different Uplink and Downlink frequency bands. The frequency used for all downlink transmissions is known as downlink frequency. Downlink is used to indicate the transmission route from the network side to mobile or fixed terminals (subscribers). The users access the network through various devices like smartphones, mobile phones, tablets etc. Wireless networks are composed of 2 main parts - the network side and the mobile/fixed subscriber side (users). In RF wireless communications like cellular or satellite networks, the term downlink indicates transmissions from network infrastructure to user devices.
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