Cisco ONS 15454 SDH Specifications Page 232

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Glossary
GL-2
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
ACT/STBY
Active/Standby.
Address mask
Bit combination used to describe the portion of an IP address that refers to the network or subnet and the portion that refers to
the host. Sometimes referred to as mask. See also subnet mask.
ADM
(Add/drop multiplexers). Linear ADMs allow signals to be added to a SONET span or dropped from a SONET span. An ADM
has three or more nodes.
Agent
1. 1. Generally, software that processes queries and returns replies on behalf of an application.
2. 2. In a network management system, a process that resides in all managed devices and reports the values of specified
variables to management stations.
AIC
Alarm Interface Controller.
AID
(Access Identifier). An access code used in TL1 messaging that identifies and addresses specific objects within the ONS 15454.
These objects include individual pieces of equipment, transport spans, access tributaries, and others. See also TID.
AIP
Alarm Interface Panel.
AIS
Alarm Indication Signal.
AIS-L
Line Alarm Indication Signal.
AMI
(Alternate Mark Inversion). Line-code format used on T1 circuits that transmits ones by alternate positive and negative pulses.
Zeroes are represented by 01 during each bit cell and ones are represented by 11 or 00, alternately, during each bit cell. AMI
requires that the sending device maintain ones density. Ones density is not maintained independently of the data stream.
Sometimes called binary-coded alternate mark inversion.
ANSI
American National Standards Institute.
APS
(Automatic Protection Switching). SONET switching mechanism that routes traffic from working lines to protect lines if a line
card failure or fiber cut occurs.
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