Specifications

1-30
Cisco ONS 15530 Planning Guide
OL-7708-01
Chapter 1 System Overview
System Components
OADM Module Configurations
In ring configurations, channels that are not supported by a node are passed through that node and sent
out on the ring. Figure 1-17 shows an example of how two OADM modules might be cabled in a
protected ring configuration.
Figure 1-17 OADM Modules in a Protected Ring Configuration
PSMs
The PSM (protection switch module) provides trunk fiber protection for Cisco ONS 15530 systems
configured in point-to-point topologies. The PSM sends the signal from an OADM module, an ITU trunk
card, or a transponder line card to both the west and east directions. It receives both the west and east
signals and selects one to send to the OADM module, ITU trunk card, or transponder line card. Both
nodes in the network topology must have the same shelf configuration.When a trunk fiber cut occurs on
the active path, the PSM switches the received signal to the standby path. Since the PSM occupies one
of the OADM subslots in the shelf, it protects a maximum of four channels and the OSC in a single shelf
configuration (see Figure 1-18).
The PSM also has a optical monitor port for testing the west and east receive signals. This port samples
one percent of the receive signals that can be monitored with an optical power meter.
Table 1-9 OADM Modules and Supported Channel Bands
Cisco ONS 15530
Channels OADM Module
1–4 Band A
5–8 Band B
9–12 Band C
13–16 Band D
17–20 Band E
21–24 Band F
25–28 Band G
29–32 Band H
88515
IN
OUT
Ch 1-4
IN
IN
IN
OUT
OUT
OUT
Ch 1-4
West
East
Thru
Thru
Wdm
Wdm
OADM
OADM