Alarm indication signal, Ais), Second (aiss) – Verilink AS2000: The Basics (880-502981-001) Product Manual User Manual
Page 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
signal.
Alarm Indication Signal Second (AISS)
A second when the CSU receives an
from the
network.
all-ones
See
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
cable. Labelled
L
OCAL
or
C
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.