Verilink AS2000: The Basics (880-502981-001) Product Manual Manual de usuario descargar pdf (Pagina 139)

Acronyms and Definitions

Verilink Access System 2000: Basics Glossary-19

FAIS Framed Alarm Indication Signal.

Framed all-ones signal, a type of

keep-alive signal (11111111). See

AIS

facility data link (FDL) The T1 facility data link is used to

transmit framing information,

error events, and loopback

controls. FDL uses 4 kbit/s of

bandwidth to transmit data. If

your installation plans to use FDL,

make sure you have selected ESF

framing format. FDL is only

available on ESF T1 circuits.

failed second (FS) See

unavailable second (UAS)

failed signal state (FSS) A failed signal state is declared

whenever 10 SESs occur

consecutively. (The FSS will not

clear until 10 consecutive seconds

of data are processed with no SESs

present.) New standards refer to a

failed signal state as an

unavailable signal state (UASS)

far-end (FE) This refers to a circuit element at

the remote end of a network

circuit.

Far-end Alarm and Control Channel

(FEAC Channel)

A DS3 C-bit subframe used to send

alarm or status information from

the far-end terminal to the near-

end terminal. The channel is also

used to initiate loopbacks at the

far-end terminal from the near-end

terminal.

far-end block error (FEBE) A maintenance signal transmitted

in the overhead that a bit error has

been detected in the physical layer

at the far end of the link. Used to

monitor bit error performance of

the link.

FAS See

frame alignment signal

(FAS)

FASER See

frame alignment signal

error rate (FASER)

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Verilink AS2000: The Basics (880-502981-001) Product Manual Manual de usuario Pagina 139

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