Packet Radio - definitie. Wat is Packet Radio
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Wat (wie) is Packet Radio - definitie

FORM OF AMATEUR RADIO DATA COMMUNICATIONS USING THE AX25 PROTOCOL
Packet Radio System; Packet Radio
  • Terminal Node Controller 2400 baud packet radio modem

packet radio         
<communications, radio> The use of packet switched communications protocols in large networks (i.e not wireless LANs or Bluetooth) having wireless links to terminals at least. Packet radio is split into {amateur packet radio} (AX25) and General Packet Radio Service (GRPS). (2001-05-12)
packet radio         
¦ noun a method of broadcasting that makes use of radio signals carrying packets of data.
General Packet Radio Service         
PACKET ORIENTED MOBILE DATA SERVICE ON 2G AND 3G
GPRS; General packet radio service; Gprs; GPRS modem; Multislot Class; Coding Scheme; CELLPAC
General Packet Radio Service (GPRS) is a packet oriented mobile data standard on the 2G and 3G cellular communication network's global system for mobile communications (GSM). GPRS was established by European Telecommunications Standards Institute (ETSI) in response to the earlier CDPD and i-mode packet-switched cellular technologies.

Wikipedia

Packet radio

In digital radio, packet radio is the application of packet switching techniques to digital radio communications. Packet radio uses a packet switching protocol as opposed to circuit switching or message switching protocols to transmit digital data via a radio communication link. Packet radio can be differentiated from other digital radio switching schemes by the following attributes:

  • Transmitted data is broken into packets, each of which contains a destination (and typically the source) address
  • A transmitted message may be broken into a sequence of packets before transmission, which are then re-assembled into the original message upon reception
  • Packets for multiple destinations can be transmitted on the same radio link in an asynchronous fashion
  • A packet may be addressed to all possible recipients rather than a specific one (broadcast)
  • A packet may be stored and subsequently forwarded towards its destination by a network node

This is very similar to how packets of data are transferred between nodes on the Internet.

Packet radio is frequently used by amateur radio operators. The AX.25 (Amateur X.25) protocol was derived from the X.25 data link layer protocol and adapted for amateur radio use. Every AX.25 packet includes the sender's amateur radio callsign, which satisfies the US FCC requirements for amateur radio station identification. AX.25 allows other stations to automatically repeat packets to extend the range of transmissions. It is possible for any packet station to act as a digipeater, linking distant stations with each other through ad hoc networks. This makes packet radio especially useful for emergency communications.

Packet radio can be used in mobile communications. Some mobile packet radio stations transmit their location periodically using the Automatic Packet Reporting System (APRS). If the APRS packet is received by an "igate" station, position reports and other messages can be routed to an internet server, and made accessible on a public web page. This allows amateur radio operators to track the locations of vehicles, hikers, high-altitude balloons, etc., along with telemetry and other messages around the world.

Some packet radio implementations also use dedicated point-to-point links such as TARPN. In cases such as this, new protocols have emerged such as Improved Layer 2 Protocol (IL2P) supporting forward error correction for noisy and weak signal links.

Voorbeelden uit tekstcorpus voor Packet Radio
1. Motorola said on Tuesday it would supply global systems for mobile/general packet radio service infrastructure.
2. General Packet Radio Services (GPRS) is a mobile data service available to mobile users.
3. Currently, internet access on mobiles in the region is only viable through general packet radio service (GPRS) technology.
4. A shortcoming of the initial model is that it will use General Packet Radio Service, or GPRS, for data transfer.
5. Mustafa Basharat KABUL, Dec 20 (Pajhwok Afghan News): Officials of the private Roshan mobile company say they are going to launch the General Packet Radio Services (GPRS) to facilitate its customers in Afghanistan.