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Glossary
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+1 protection
A card protection scheme that pairs a single working card with a single dedicated protect card. A term
specific to optical cards.
1:N protection
A 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. A term specific to electrical cards.
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.
1.
2. In a network management system, a process that resides in all managed devices and reports the
2.
values of specified variables to management stations.
November 2001
A P P E N D I X
Cisco ONS 15454 Installation and Operations Guide
D
D-1
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