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E-carrier
Technology of transmiting voice, replaced by the Ethernet
FDM
Multiplexation that divides stream of data into different frequencies carried by a transmission medium
FDMA
Sharing one FDM network between many transmitters
T1
The digital telephone standard which is able to transmit up to 24 multiplexed voice
WDM
Multiplexation that divides stream of data into several rays with different wavelengths. Commonly used in fiber-optic networks
Jitter
Deviation from true periodicity of signal resulting in local change of amplitude, frequency or phase
ADM
A kind of multiplexer used in in fiber-optic networks. Based on FP interferometer used to separate or join beams of light
ROADM
The configurable version of ADM multiplexer. Often used in metropolitan area networks (MANs)
Wander
The phenomenon similar to Jitter, but it cannot be damped. It concers clock signals
MIMO
Communication channel created using signal polarization. It allows transmission of more than one data streams through one medium. Commonly used in SatTV
Polarization
The property applying to transverse waves that specifies the geometrical orientation of the oscillations
FHSS
The technology of multiplexation which uses rapidly changing frequency of the carrier signal in pseudorandom manner. Transmitter and receiver know the order of frequencies, but for other devices this transmission is a noise
DMZ
The subnetwork that separate LAN from other networks. Servers and services are located inside it, so there is access from internet but the local network is unreachable
ISP
The company that provides access to the Internet for a fee.
NAT
It is a process where a network device, usually a NAT server, assigns a public address to a computer (or group of computers) inside a private network