Verilink AS2000: The Basics (880-502981-001) Product Manual Manual do Utilizador descarregar pdf (Página 168)

Acronyms and Definitions

Glossary-48 Verilink Access System 2000: Basics

UART Universal Asynchronous Receiver

Transmitter—an integrated circuit

that converts parallel data to serial

data and vice versa.

UAS See

unavailable second (UAS)

UL See

Underwriters Laboratory

(UL)

unavailable second (UAS) Counted for every second in which

an unavailable signal state occurs.

This term is used by new

standards in place of

failed

second (FS)

unavailable signal state (UASS) Declared whenever 10 consecutive

severely errored second (SES)

occur. The unavailable signal state

will not clear until 10 consecutive

seconds of data are processed with

no SESs present.

Underwriters Laboratory (UL) A company that tests equipment

for electronic safety. If the

instrument passes this company’s

tests, it is underwritten and given

the “UL” seal.

unipolar A signal stream in which all one

bits are the same polarity.

universal power supply (PWR 2940) The Verilink brick power supply

unit for the dual-line shelf that

accepts AC or DC inputs.

unprivileged password A Craft interface (ASCII) password

that permits an ASCII operator to

perform limited operations on a

module.

user register Any of various statistics kept in a

CSU for the previous 24 hours

according to

Extended

Superframe Format (ESF)

specifications.

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