Verilink AS2000: The Basics (880-502981-001) Product Manual Instrukcja Użytkownika Pobierz pdf (Strona 131)

Acronyms and Definitions

Verilink Access System 2000: Basics Glossary-11

CPE Customer-provided or customer-

premises equipment.

Craft interface Verilink’s name for accessing

firmware using an ASCII terminal.

See

ASCII interface

CRC-4 See

cyclic redundancy check

(CRC)

CRC-6 See

cyclic redundancy check

(CRC)

CRC error event Occurs when the

cyclic

redundancy check (CRC)

code in

a received

Extended Superframe

Format (ESF)

or E1 signal fails to

match the CRC code calculated

locally by the CSU. A CRC error

event indicates that at least one bit

of the frame has not been received

correctly.

CRC-6 regeneration A mode in which the CRC-6 is

recalculated for incoming data

before it is retransmitted. In this

mode, any incoming CRC-6 errors

are not propagated (although the

data may be corrupted). See

cyclic

redundancy check (CRC)

crosspoint switch A device that switches information

between timeslots.

CSES C-bit Severely Errored Seconds. In

DS3 circuits, a second with 44 or

CCV

s OR one or more

out-

of-frame (OOF)

defects OR a

detected incoming

AIS

CSU See

Channel Service Unit (CSU)

CTS Clear-To-Send (CTS) signal is used

to throttle the flow of data

between a

data terminal

equipment (DTE)

and a

data

circuit- terminating equipment

(DCE)

device. The DCE device (i.e.

DSU) can drop the signal to stop

data coming in from the DTE

device and can later raise this

signal to restart the flow of data.

current The amount of electrical charge

flowing past a specified circuit

point per unit of time. Measured

in Ampere (amp).

customer premises equipment (CPE) The equipment (telephones, key

systems, PBXs, modems, video

conferencing, etc.) connected to a

network and residing at a

customer location.

CV-L See

code violation—line (CV-L)

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