Verilink AS2000: The Basics (880-502981-001) Product Manual Uživatelský manuál stáhnout pdf (Strana 156)

Acronyms and Definitions

Glossary-36 Verilink Access System 2000: Basics

off-hook The condition indicating the active

state of a voice circuit.

OID Object identifier—the address of a

Management Information Base

(MIB)

variable.

ones density The requirement for digital

transmission lines in the public

switched telephone network that

eight consecutive zeros cannot

exist in a digital transmission.

There are different ones density

algorithms available to ensure that

enough ones are included in the

bit stream. Required with T1

alternate mark inversion (AMI)

line coding.

on-hook The condition indicating the

inactive state of a voice circuit.

on-line When a device is actively

connected to a network.

OOF See

out-of-frame (OOF)

Open System Interconnection (OSI) Developed by the ISO, the only

internationally standardized

framework for communication

between different systems made

by different vendors.

OSI See

Open System

Interconnection (OSI)

out-of-frame (OOF) A condition when any two of four

or two of five consecutive frame

bits received from the network line

are incorrect or lost. The CSU

attempts to reframe. User data is

lost during an OOF condition.

out-of-frame second (OOFS) A second during which an

out-of-

frame (OOF)

condition exists.

out-of-service (OOS) Equipment removed from service.

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