Verilink AS2000: The Basics (880-502981-001) Product Manual Uživatelský manuál stáhnout pdf (Strana 122)

Acronyms and Definitions

Glossary-2 Verilink Access System 2000: Basics

alarm declare time The number of seconds between a

CSU receiving an alarm, and the

CSU reporting the alarm.

alarm indication signal (AIS) An unframed bit pattern of ones

(11111111) in all timeslots on the

span. A CSU will interpret two

consecutive frames with less than

three zeros in the data bit stream

as a received AIS. The CSU

transmits AIS to the network when

it receives an AIS or LOS alarm

condition. This is also called a

keep-alive or

red alarm

signal.

Alarm Indication Signal Second (AISS) A second when the CSU receives an

unframed all-ones

alarm

indication signal (AIS)

from the

network.

all-ones See

alarm indication signal

(AIS)

alternate mark inversion (AMI) A digital signal in which successive

ones (pulses) alternate in polarity

and in which zeros (spaces) are of

zero amplitude.

ANSI American National Standards

Institute.

application equipment Router, PBX, etc. connected to

AS2000 data or equipment ports.

ASCII American National Standard Code

for Information Interchange—A

standard governing the character

codes used for data

communications and data

processing.

ASCII interface The port used to connect a module

to a terminal using a

Craft

interface

cable. Labelled

OCAL

RAFT

below the port on the

module front panel.

ASCII screen Module information displayed on

an ASCII terminal windows.

asynchronous A data transmission using one

start bit and one or two stop bits

to frame each character, instead of

using seperate transmit and

receive clock leads (synchronous).

asynchronous transfer mode (ATM) A high-speed transmission using a

high-bandwidth, low-delay, cell-

based switching and multiplexing

technique.

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