Showing 1 - 20 of 81 results
WAN
Wide Area Network ... Read More
On-line
Electronic availability on demand from a computer-based system without mounting removable media such as magnetic tape or disks. ... Read More
Outage
A telecommunication service condition wherein a user is deprived of service due to a malfunction of the communication system. ... Read More
Packet
In data communication, a grouping of a sequence of binary digits, including data and control signals, that is transmitted and switched as a composite whole. The data, control signals, and possibly error control information, are arranged in a specific format. The packet can be of either fixed or variable length. ... Read More
Packet mode
A packet switched operational mode for transferring (transporting and switching) user information through a network without establishing a connection. The packets do not necessarily arrive at their destination in the order they were sent, unlike the circuit mode of transmission. See packet switching. ... Read More
Protocol
Any set of standard procedures that permit devices to intercommunicate. ... Read More
Public Switched Telephone Network (PSTN)
Any common carrier network that provides circuit switching among public users. Note: The term is usually applied to the public switched telephone network, but it could be applied more generally to other switched networks, e.g., packet switched public data networks. ... Read More
Quadrature Phase Shift Keying (QPSK)
Digital modulation scheme used in transmission communications that allows increased sending capacity. ... Read More
Radio Frequency Interference (RFI)
A term used to denote apparent disturbance or distortion to satellite signals. ... Read More
Narrowcasting
Using the electronic media to reach a specific audience ... Read More
MSS
Mobile Satellite Service ... Read More
ISDN
Integrated Services Digital Network ... Read More
k/bs
Kilobit per second ... Read More
Ka-band
A higher frequency than Ku-band, operating from 18 to 31 GHz. ... Read More
Ku-band
The range of frequencies between 11 and 14 GHz used increasingly by communications satellites. ... Read More
LNA
Low Noise Amplifier ... Read More
Local Area Network (LAN)
A data communications system that (a) lies within a limited spatial area, (b) has a specific user group, (c) has a specific topology, and (d) is not a public switched telecommunications network, but may be connected to one. ... Read More
Modem
Acronym for MOdulator-DEModulator. A device that modulates and demodulates signals. Note: Modems are primarily used for converting digital signals into quasi-analog signals for transmission over analog communication channels and for reconverting the quasi-analog signals into digital signals. ... Read More
Modulation
The process of superimposing an information signal onto a carrier for transmission. ... Read More
Shared hub
A satellite communications operations center which is shared among a number of separate network users; often used for VSAT operations. ... Read More
