Verilink AS2000: The Basics (880-502981-001) Product Manual Manual do Utilizador descarregar pdf (Página 141)

Acronyms and Definitions

Verilink Access System 2000: Basics Glossary-21

FE LUAS Far-end Local Unavailable Second.

unavailable second (UAS)

the far-end CSU counted by the

local CSU.

Fiber-Distributed Data Interface (FDDI) A LAN token ring standard

developed by the ANSI X3T9.5

committee. Uses fiber optics cable

operating at 100 Mbit/s, in a dual-

ring topology (up to 500 nodes),

over a maximum distance of 100

kilometers. FDDI was originally

defined for multimode fiber,

although specifications now exist

for copper (CDDI) and single mode

fiber.

firmware A set of instructions embedded

into a semiconductor (any software

residing in silicon).

flash See

EPROM.

fractional E1 A E1 in which less than 31 DS0

timeslots have been leased.

fractional T1 A T1 in which less than 24 DS0

timeslots have been leased.

fractional T3 A T3 in which less than 28 DS1

timeslots have been leased.

FRAD See

Frame Relay Access Device

(FRAD)

frame A group of bits sent serially (one

bit at a time) over a digital network

conforming to a standard format

(for example, number of bits per

frame, speed parameters, and

timeslot apportionment). Each

frame is an organized unit that

aids the transmitting and receiving

ends of the network to

synchronize.

frame alignment signal (FAS) A bit pattern used by the receiving

end to locate the beginning of a

frame.

frame alignment signal error rate

(FASER)

Tracks how often frame alignment

signals are in error within a

specific time interval.

frame bit error (FE) An error in the received framing bit

pattern.

frame bit errored second (FBES) The number of whole seconds that

a framing bit error (LOF) has

occurred.

frame relay A network switching protocol that

uses small packets and requires

less error checking than traditional

forms of packet switching.

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