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Chapter 3
Electrical Cards
3.11.5 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:
•
•
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.
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
electrical card slot protection and restrictions.
In 1:1 or 1:N protection group with DS3XM12 cards having different backplane bandwidths, when a
protection switch moves traffic from the working/active card to the protect/standby card or vice versa, it
causes a traffic hit of greater than 50ms.
3.11.6 Card Features
Table 3-15
Table 3-15
Feature
Protection
Upgrade
Performance
Monitoring
Loopbacks
78-18106-01
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.
summarizes the DS3XM-12 features.
DS3XM-12 Features
Description
1:1 and 1:N protection ("ported" and "portless")
•
Errorless software upgrade
In-service upgrade of legacy DS3XM-6 to DS3XM-12 (> 60 ms hit)
•
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
•
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
•
3.11.5 Protection Modes
for more information about
Cisco ONS 15454 Reference Manual, R8.5
3-29
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