Cisco ONS 15454 SDH Specifications Page 231

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GL-1
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
GLOSSARY
Numerics
1:1 protection
An electrical card protection scheme that pairs a working card with a protect card of the same type in an adjacent slot (DS-1
and DS-3 speeds). 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 to the working card.
1+1 protection
An optical (OC-N) card protection scheme that pairs a single working port/card with a single dedicated protect port/card. All
OC-N cards can use this protection type (OC-3, OC-12, OC-48, and OC-192 speeds).
1:N protection
An electrical card protection scheme that allows a single protect card to provide protection for several working cards (DS-1
and DS-3 speeds). If a 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 to the working card.
10BaseT
Standard 10 Mbps local area network over unshielded twisted pair copper wire.
100BaseT
Standard 100 Mbps local ethernet network.
100BaseTX
Specification of 100BaseT that supports full duplex operation.
A
Access drop
Points where network devices can access the network.
ACO
Alarm cutoff.
Active card
A card that is working or carrying traffic. A card provisioned as working can be an active card or, after a protection switch, a
protect card can be an active card.
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