Specifications

1-32
Cisco ONS 15530 Planning Guide
OL-7708-01
Chapter 1 System Overview
System Components
Switch Fabric
The Cisco ONS 15530 CPU switch module has a 32-port by 32-port, nonblocking switch fabric, which
can carry up to 3.125 Gbps of traffic per port (for data traffic and the remainder for control traffic). The
switch fabric connects signals from client side line cards, such as the ESCON aggregation card, to ITU
side line cards, such as the 10-Gbps ITU trunk card (see Figure 1-19). When a shelf is configured for
CPU switch module redundancy, the redundant switch fabric increases system availability by protecting
against switch fabric failures.
Figure 1-19 Redundant Switch Fabrics
Note Transponder line cards contain both client and ITU optics and do not interface with the switch fabric.
CPU Switch Module Redundancy and Online Insertion and Removal
When the Cisco ONS 15530 is powered up, the two CPU switch modules engage in an arbitration
process to determine which will be the active and which will be the standby. Previous power state
information is stored in the CPU non-volatile random access memory (NVRAM). The CPU that was
previously active reassumes the active role. During operation, the two CPU switch modules remain
synchronized (application states, running and startup configurations, system images). The operational
status of each CPU switch module is monitored by the CPU switch module redundancy controller of the
other CPU switch module through the backplane Ethernet. In the event of a failure or removal of an
10-port ESCON card
10-Gbps ITU trunk card or
10-Gbps uplink card
Active signal
Standby switch
fabric
Electrical backplane
connection
2.5 -Gbps
aggregated
signal
SRC
LRCLRC
79312
Redundant
CPU switch
modules