Specifications

2-15
Cisco ONS 15530 Planning Guide
OL-7708-01
Chapter 2 Protection Schemes and Network Topologies
Switch Fabric Based Line Card Protection
Figure 2-11 shows switch fabric based protection with redundant switch fabrics.
Figure 2-11 Switch Fabric Based Protection Example With Redundant Switch Fabrics
Switch Fabric Based Protection Considerations
The following considerations apply when using switch fabric based protection:
• Switch fabric based protection does not protect against failures of the aggregation cards or the client
equipment. To protect against these failures, line card protection should be implemented on the
client equipment itself (see the “Client Based Line Card Protection” section on page 2-9).
• Due to their lower optical power loss, we recommend using the nonsplitter 2.5-Gbps ITU trunk cards
and 10-Gbps ITU trunk cards for configurations with switch fabric protection.
• Because of APS messaging conflicts, you cannot mix switch fabric based protected signals with
y-cable protected signals on a 10-Gbps ITU trunk card.
• The APS software that supports switch fabric protection can be configured as revertive or
nonrevertive. After a switchover, the active traffic can be put back on the previously failed working
fiber, once the fault has been remedied, either automatically (revertive) or through manual
intervention (nonrevertive).
• Switch fabric protected configurations allow monitoring of the protection fiber without the OSC.
• Up to two channels on a single shelf can be protected with switch fabric protection.
10-port ESCON card
ITU trunk card
ITU trunk card
CPU
switch
module
OADM
modules
West
East
Optical
cross connect
Active signal
Standby
signal
10-GE ITU
transceiver
2.5 -Gbps
aggregated
signal
SRC
LRCLRC
LRC
79304
Electrical backplane
connection
10-Gbps
10-Gbps