Cisco ONS 15327 User Documentation page 525

G L O S S A R Y
Numerics
1:1 protection
A card protection scheme that pairs a working card with a protect card of the same type in an adjacent slot. If the working card
fails, the traffic from the working card switches to the protect card. When the failure on the working card is resolved, traffic
reverts back to the working card if this option is set. This protection scheme is specific to electrical cards.
1:N protection
An electrical-card protection scheme that allows a single card to protect several working cards. When the failure on the working
card is resolved, traffic reverts back to the working card.
1+1 protection
An optical-card protection scheme that pairs a single working card with a single dedicated protect card.
A
Access drop
Points where network devices can access the network.
Address mask
Bit combination used to describe the portion of an IP address that refers to the network or subnet and the part that refers to the
host. Sometimes referred to as mask. See also subnet mask.
ADM
Add/drop multiplexer. ADM allows a signal to be added into or dropped from a SONET span.
Agent
1. Generally, software that processes queries and returns replies on behalf of an application.
2. In a network management system, a process that resides in all managed devices and reports the values of specified variables
to management stations.
AID
Access Identifier. An access code used in TL1 messaging that identifies and addresses specific objects within ONS nodes.
These objects include individual pieces of equipment, transport spans, access tributaries, and others.
Cisco ONS 15327 User Documentation, R3.3
GL-1
June 2002