Verilink AS2000: The Basics (880-502981-001) Product Manual Uživatelský manuál stáhnout pdf (Strana 137)

Acronyms and Definitions

Verilink Access System 2000: Basics Glossary-17

E-bits Used in E1 transmissions, each

cyclic redundancy check (CRC)

submultiframe uses one E-bit.

These bits reside in frames 13 and

15 of the

cyclic redundancy

check multiframe

. The bits

indicate to the far end that a CRC-4

error was received. There are two

E-bits—one for each sub-

multiframe.

E1 European standard for a 2.048

Mbit/s digital line containing 32

timeslots.

EFS See

error-free second (EFS)

ELB See

equipment loopback (ELB)

electromagnetic interference (EMI) Radiation leakage from a device

using high-frequency wave energy

and signal level. Acceptable levels

for particular devices and

operating frequency are specified

by such agencies as the Federal

Communications Commission,

British Approvals Board of

Telecommunications, Verband

Deutscher Electrotechniker

(referred to as VDE), and the

Canadian Safety Association.

Electronic Industries Association (EIA) An American association that

defines standards for transmitting

serial data by wire.

EPROM Erasable Programmable Read Only

Memory (EPROM or Flash). A

memory that can be recorded or

erased electronically, and does not

lose its content when electrical

power is removed.

equipment loopback (ELB) A test condition that sends the

signal from the end-user’s

equipment to the CSU’s Equipment

port and back to the equipment

port without passing through the

CSU circuitry.

error-free second (EFS) A second with no detected errors.

errored second (ES) A second with one or more error

events.

errored seconds-line The number of seconds with one

or more code violation-lines. See

code violation—line (CV-L)

errored seconds-path The number of seconds in which a

bipolar violation occurs on the

network line. See

code

violation—path (CV-P)

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