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Glossary-13160-A2-GB21-50 January 1997
Glossary
ACAMI allocation method Alternate Channel Alternate Mark Inversion. A method of allocating DS0 channels
as a group, so that every alternate DS0 channel does not carry data, but instead
transmits and receives all ones.
ACCULINK A product family and a registered trademark.
ACO Alarm Cut-off command. A command for carrier-mounted DSU/CSUs that forces a
deactivation of the alarm relay on the 3000 Series Carrier.
Activ Active configuration area. The configuration option set that is currently active for
the device. Before a configuration option set becomes active, you must save the set
to the Active configuration area.
adapter Hardware that provides some transitional function between two or more devices.
address A symbol (usually numeric) that identifies the interface attached to a network.
agent (SNMP) A software program housed within a device to provide SNMP functionality. Each
agent stores management information and responds to the manager’s request for
this information.
aggregate A single bit stream that combines two or more bit streams.
AIS Alarm Indication Signal. A signal transmitted instead of the normal signal to
maintain transmission continuity and to indicate to the receiving device that a
transmission fault exists.
AMI Alternate Mark Inversion. A line coding technique used to accommodate the ones
density requirements of T1 lines.
ANSI American National Standards Institute. An organization devoted to the development
of voluntary standards.
application The use to which a device is put.
ASCII American Standard Code for Information Interchange. A 7-bit code which
establishes compatibility between data services.
ASCII terminal/printer Devices that can be attached, either locally or remotely, to the DSU/CSU to display
or print alarm messages.
asynchronous data Data transmission that is synchronized by a transmission start bit at the beginning
of a character (five to eight bits) and one or more stop bits at the end.
authenticationFailure trap An SNMP trap that indicates that the device has received an SNMP protocol
message that has not passed the active security measures.
AUX port The auxiliary communications port on the DSU/CSU.