Glossary
GL-8
Cisco 6260 Hardware Installation Guide
OL-2365-02
accounting
management
One of five categories of network management defined by ISO for the management of ISO networks.
Accounting management subsystems are responsible for collecting network data that relates to resource
usage. See also
configuration management
,
fault management
,
performance management
, and
security
management
.
address
Data structure or logical convention used to identify a unique entity, such as a particular process or
network device.
ADSL
asymmetric digital subscriber line. An
x
DSL technology in which more bandwidth is delivered
downstream (from the CO to the customer site) than upstream over a single copper twisted pair.
Compare with
IDSL
,
SDSL
, and
SHDSL
. See also
DSL
.
alarm
A notification that a traffic signal has degraded or failed or that equipment is malfunctioning. See also
event
and
trap
.
AM
amplitude modulation. A modulation technique by which information is conveyed through the
amplitude of the carrier signal. Compare with
FM
and
PAM
. See also
modulation
.
American National
Standards Institute
See
ANSI
.
American Wire
Gauge
See
AWG
.
amplitude
modulation
See
AM
.
ANSI
American National Standards Institute. An organization that coordinates, develops, and approves
international and U.S. standards for, among other things, communications and networking. ANSI is a
member of ISO. See also
ISO
.
APS
automatic protection switching. A method that allows transmission equipment to recover automatically
from failures, such as a cut cable.
asymmetric digital
subscriber line
See
ADSL
.
asynchronous
communications
A method of transmitting data in which individual characters are encapsulated in control bits (called
start and stop bits) that designate the beginning and end of each character. Asynchronous transmission
allows communication without precise clocking.
Asynchronous
Transfer Mode
See
ATM
.
ATM
Asynchronous Transfer Mode. The international standard for cell relay in which multiple service types
(voice, video, or data, for example) are transmitted in fixed-length (53-byte) cells. ATM offers fast
packet technology, and real-time, demand-led switching for efficient use of network resources.
ATM adaptation
layer
See
AAL
.
ATU-C
See
xTU-C
.
ATU-R
See
xTU-R
.