Specifications

1-35
Cisco ONS 15530 Planning Guide
OL-7708-01
Chapter 1 System Overview
System and Network Management
OSC
The OSC is an out-of-band method for providing OAM&P functions on a 33rd wavelength. The OSC
supports a message channel that functions like the DCC for management and provisioning. Messages
transit the network hop-by-hop, and they can be forwarded or routed according to established routing
protocols. The OSC can be used to carry traffic to a network management system, or to carry other
internodal management traffic such as link management, fiber failure isolation, performance monitoring,
alarms, and APS protocol messages.
OSC Considerations
The following considerations apply for the OSC:
• OSC requires a carrier motherboard, which occupies a slot in the shelf, and one or two OSC
modules.
• When a node supports OSC, the neighboring nodes in the topology must also support OSC.
• To manage the network topology, every node must support OSC.
NME
The NME is a 10/100 Ethernet port on the CPU switch module. You can connect this port to a router and
configure the interface to route messages using established routing protocols. The NME can be used to
carry traffic to a network management system.
Note The NME provides little in the way of topology management or fault isolation. We recommend using the
in-band message channel, OSC, or both to manage and troubleshoot your network topology.
NME Considerations
The following considerations apply to the NME:
• To remotely manage nodes in the network topology using the NME, each system must be accessible
through an IP network.
• The NME port is present on every CPU switch module and does not require extra equipment or a
slot in the shelf.
Comparison of In-Band Message Channel, SONET, and OSC
Table 1-10 compares the features provided by the in-band message channel, SONET SDCC, and OSC.
Table 1-10 Comparison of the In-Band Message Channel, SONET, and OSC
Feature OSC
In-Band Message
Channel SONET
1
Management reach Per fiber section Per wavelength Per wavelength
Fault isolation and
topology discovery
Hop-by-hop fiber
(physical topology)
End-to-end wavelength
(logical topology)
End-to-end wavelength
(logical topology)
Payload Separate out-of-band
channel
10-GE, Fibre Channel,
FICON, GE, ESCON
SONET (OC-n)