Chapter 2 Product Configurations
ONS 15200 Network Configurations
2.1.3 Dual-Home Configuration
In the dual-home configuration, a pair of ONS 15201 SCUs share the total data traffic load between two different fiber-optic cable (fiber) routes. The pair of ONS 15201 SCUs can use identical or different wavelength channels to communicate with their respective ONS 15252 MCUs. Using identical wavelength channels conserves network resources. In addition to load sharing, the dual-home configuration provides traffic protection in the electronic client-layer domain. If one fiber route is lost, the data traffic shifts to the other fiber route in the client layer.
In addition to protecting traffic at the client layer, the dual-home configuration protects the ONS 15200 system against single MCU or SCU failures. Figure 2-3illustrates the ONS 15200 dual-home configuration.
Note The physical connection in Figure 2-3consists of two fiber-optic cables.
Figure 2-3 Dual-home configuration
PHYSICAL | | | | |
CONNECTION | | | | |
| ONS 15252 | | ONS 15252 |
| LOGICAL CONNECTIONS | | |
ONS 15201 | | | | ONS 15201 |
| ONS 15201(TWO) | | |
ONS 15201 | ONS 15201 | ONS 15201 | ONS 15201 | ONS 15201 |
LEGEND
ONS - Optical network system
2.1.4 Multichannel Point-to-Point Configuration
In the ONS 15200 multichannel, point-to-point configuration, multiple wavelength channels exist between a pair of ONS 15252 MCUs. You can set up the multichannel point-to-point configuration with or without optical-layer protection. Configuring optical-layer protection requires dual fiber routes.
In the ONS 15200 multichannel, point-to-point configurations, dual fiber routes send information along two separate fiber routes. The dual physical route configuration supports SONET or SDH add/drop multiplexer (ADM) protection and client-layer 1+1 APS protection.
Cisco does not recommend implementing layer-3 load-sharing protection in a multichannel point-to-point configuration because the two network fiber routes need to share an ONS 15252 MCU, and any failure of the ONS 15252 MCU would cause both routes to disappear simultaneously. Figure 2-4illustrates the ONS 15200 multichannel, point-to-point configurations.
Cisco ONS 15200 Product Description
