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FDDI
Reading: F D D eye
Full spelling: Fiber-Distributed Data Interface
Field:
Network technology > optical communication > FDDI |
The standard which almost in similar specification uses the copper wire in transmission media is called CDDI.
The American National Standards Institute with it is standardized in 1987 and after that, has become also the standard of ISO.
The multi-mode optic fiber or the single mode optical fiber are used, as for maximum transmission rate as for 100Mbps and maximum transmission distance it is 2km. As for network topology there is many a thing which is made ring type, but it can select also star type.
Utilizing high-speed characteristic, in the mainstay LAN and the like which connects Ethernet mutually it was utilized, but price of the equipment is high in comparison with Ethernet, is becoming unable to use attendant upon the acceleration of Ethernet.
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FDM <Frequency division multiplex>
Reading: F D m
Full spelling: Frequency Division Multiplexing
Field:
Network technology > connection > FDM |
| Bundling the plural circuits, one of the multiplexing which shares one 1 these circuits. Dividing equally the frequency zone of the common-user circuit, the system which it allots to the plural circuits, |
FDMA <Frequency division multiple access>
Reading: F D m a
Full spelling: Frequency Division Multiple Access
Field:
Portable telephone > communication method > FDMA |
One of multiplex systems of radio communication. Zone the whole frequency is divided into several zones, the individual channel is allotted to each zone, the system where the group of originators do communication simultaneously. NTT system and TACS, AMPS and NMT etc which are portable telephone system of the 1st generation are the technology which uses FDMA. |
FEAL
Reading: Feeling
Full spelling: Fast data Encipherment ALgorithm
Field:
Security > code/hash > FEAL |
| The encryption which NTT developed. FEAL is encryption of the secret key type which uses the same key to encoding and decoding. DES which the IBM corporation developed as the encryption which uses the secret key has spread to be wide, but FEAL DES compared to encoding/is a merit such that it can decode in high speed. |
FED <Field emission display>
Reading: [ehuidei]
Full spelling: Field Emission Display
Field:
Imaging > display > FED
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The display of the principle where electron emission source of plane from it shoots the electron truly in the sky, throws to the fluorescent substance and radiates. With the technology which designates the device which hits against the electron gun of the picture tube as plane, the picture tube it seems the way being bright, the picture whose contrast is high is actualized with large-sized plane surface display.
As for luminous principle being similar to the picture tube, those which it throws to the fluorophor which was applied to the luminous aspect. With the picture tube the electron gun which discharges the electron from the luminous aspect the numbers of ten - several dozen cm is one in the position where it is far, but with FED the electrode of minute projection condition equal to the same number as the pixel has lined up into lattice condition on the glass baseplate, each leaving, several mm facing, directing to the fluorescent substance on the glass baseplate which is arranged, it discharges the electron.
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