Verilink AS2000: The Basics (880-502981-001) Product Manual Manual de usuario descargar pdf (Pagina 133)

Acronyms and Definitions

Verilink Access System 2000: Basics Glossary-13

D4 See

Superframe (SF/D4)

DACS Digital Access and Cross-connect

System—a digital switching device

for routing and switching T1/E1

lines, and DS0 portions of lines

among multiple T1/E1 ports. Used

within the network backbone.

data Digitally represented information

(1’s or 0’s) falling into one of four

groups: voice, text, facsimile, and

video.

data carrier detect (DCD) Control lead used to indicate

data

circuit- terminating equipment

(DCE)

is receiving a valid framed

signal.

data channel A portion of bandwidth of a

communications channel which is

configured to support a

synchronous serial interface.

data circuit- terminating equipment

(DCE)

In a digital communications link,

equipment at which a network

circuit terminates; either at the end

user’s site or within the network.

Examples include DSUs, CSUs.

Data Interface Unit (DIU) A high speed device that interfaces

data equipment ports with a CSU

(Verilink’s name for a

Data

Service Unit (DSU)

data link A general term referring to the

transmission of data from one

location to another using

predetermined hardware, and

protocols. Data links can be

attained using telephone lines,

coaxial cables, radio and/or

microwave signals, or fiber-optic

cables and lasers.

data port AS2000 interface to

data terminal

equipment (DTE)

, mounted at the

connector interface modules

(CIM)

Data Service Unit (DSU) Converts a

synchronous

asynchronous

serial data interface into the

formatted data stream required by

a digital service. Signal is then

passed to a

Channel Service

Unit (CSU)

for transmission to the

network.

data set ready Control lead indicating the

data

circuit- terminating equipment

(DCE)

is ready to operate.

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