Cisco Cisco ONS 15454 M2 Multiservice Transport Platform (MSTP) Hoja De Datos

 

 

© 2011

–2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. 

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Nonlinear Impairments: Four-wave mixing (FWM), self phase modulation (SPM), and cross-phase 

modulation (XPM) 

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Interface properties: Bit rate, Forward Error Correction (FEC) scheme, modulation, sensitivity, etc. 

With these comprehensive capabilities, creation of an optical path is extremely simple and reliable. The operator 

needs to select the endpoints of the service, and the control plane determines an optically feasible path across the 

DWDM network. This path is calculated using all the benefits of Cisco hardware and optical flexibility. With the 

availability of omnidirectional and colorless wavelength switching, it becomes very easy for an operator to handle 

network failures and to optimize wavelength paths as the network evolves, as illustrated in Figure 3. The hardware 

allows a service to be introduced using a new wavelength and provides a new path either automatically (in the 

case of 1+R or 1+1+R restoration) or at the click of a button (in the case of manual restoration) using the rerouting 

capabilities of the DWDM control plane. 

Figure 3.    40 Gbps Service with Cisco WSON Path Computation and Restoration 

 

Traditionally, DWDM networks are managed by a centralized network management system (NMS). The 

impairment-aware computation can also follow a centralized model, with an NMS application helping to make the 

traffic path computations, but this approach has major drawbacks. The NMS needs to have a large amount of 

information from all the nodes. This information is aggregated over multiple links, and the network elements have 

to collect and pass the information from remote nodes, while adding their own information. This cumulative 

information collection puts a huge load on the data communication network (DCN). The DCN becomes a mission-

critical bottleneck in this case, with a very stringent SLA requirement. A mismatch of information between the 

network and NMS can result, leading to incorrect path computations that result in service disruptions, which can 

also be very hard to troubleshoot.  

Cisco’s distributed control plane implementation avoids the need for a powerful central server, because 

computations are handled at network elements. As service providers introduce new network elements, add or 

remove facilities, or activate new circuits, the control plane automatically distributes the new information to update