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Cisco ONS 15454 Reference Manual, R7.0
78-17191-01
Chapter 3 Electrical Cards
3.10 3.10.5 Protection Modes
3.10.5 Protection Modes
The DS3XM-12 card supports 1:1 and 1:N protection groups, where N <= 5. However, N <= 7 if one of
the following conditions is true:
• Only portless connections are used.
• A combination of ported and portless connections is used but all the ported cards being protected
are on the same side of the chassis as the protecting card.
These protection groups can be implemented in the ONS 15454 SONET platform for both the A and B
sides and do not require a special protect card.
Note A DS3XM-12 card cannot protect a DS3XM-6 card, except during a card upgrade.
In 1:N protection, the protect card must be in Slot 3 or 15. In 1:1 protection, the working and protect
cards must be in adjacent slots. The protection switches cause a traffic hit of no more than 50 ms. See
the “7.2 Electrical Card Protection and the Backplane” section on page 7-5 for more information about
electrical card slot protection and restrictions.
3.10.6 Card Features
Table 3-14 summarizes the DS3XM-12 features.
Table 3-14 DS3XM-12 Features
Feature Description
Protection 1:1 and 1:N protection (“ported” and “portless”)
Upgrade • Errorless software upgrade
• In-service upgrade of legacy DS3XM-6 to DS3XM-12 (> 60 ms hit)
Performance
Monitoring
• DS-3 M2-3 near-end performance monitoring (PM) parameters
• DS-3 C-bit near end and far end PM parameters
• DS-1 near end PM parameters
• DS-1 Extended Super Frame (ESF) PM far end parameters based on FDL
PRM messages
• 1989 AT&T TR 54016 DS1 ESF PM
• SPRM and NPRM DS1 PM parameters
Loopbacks • DS3 terminal and facility
• DS1 facility
• DS1 terminal
• FEAC based DS1 and DS3 loopbacks (TX and RX)
• DS1 ESF-FDL TX line and payload loopbacks
• DS1 SF (D4) “in-band” TX loopbacks
• AT&T TR 54016 ESF DS1 TX line and payload loopbacks