Specifications

2-13
Cisco ONS 15530 Planning Guide
OL-7708-01
Chapter 2 Protection Schemes and Network Topologies
Switch Fabric Based Line Card Protection
Figure 2-9 Client Based Line Card Protection Scheme for 8-Port FC/GE Aggregation Cards and 2.5-Gbps ITU Trunk Cards
Considerations for Client Protection With 2.5-Gbps ITU Trunk Cards or 10-Gbps ITU Trunk Cards
The following considerations apply when using client protection:
• Due to their lower optical loss, we recommend using nonsplitter line cards for configurations with
client protection.
• Client protected configurations allow monitoring of the protection fiber without the OSC.
• Up to two channels can be client protected on a single shelf if the OSC is not supported; if the OSC
is supported, one channel can be client protected on a single shelf.
Switch Fabric Based Line Card Protection
The Cisco ONS 15530 provides facility and trunk or uplink card protection based on the switch fabric
connecting one aggregation card to two 2.5-Gbps ITU trunk cards, two 10-Gbps ITU tunable or non
tunable trunk cards, or two 10-Gbps uplink cards.
With switch fabric protection, when a signal failure occurs on the trunk fiber or on a trunk card or uplink
card, the system switches over to the standby signal. In the case of redundant switch fabrics, a failure in
the switch fabric itself causes a switchover to the standby switch fabric. The ESCON aggregation card,
4-port 1-Gbps/2-Gbps FC aggregation card, or 8-port FC/GE aggregation card sends two 2.5-Gbps
8-port FC/GE card
8-port FC/GE card
2.5-Gbps ITU trunk card
ITU trunk card
OADM
modules
West
East
SRC
LRC
LRC
LRC
LRC
85855
Active signal
Optical fiber
connection
Electrical backplane
connection
Standby
switch fabric
connection
Redundant
CPU switch
modules
Client
switch
2.5-Gbps