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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 2-3 illustrates the ONS 15200 dual-home configuration. Note The physical connection in Figure 2-3 consists of two fiber-optic cables. Figure 2-3 Dual-home configuration CLIENT CLIENT CLIENT ONS 15252 ONS 15252 ONS 15201 ONS 15201 ONS 15201 ONS 15201(TWO) ONS 15201 ONS 15201 ONS 15201 ONS 15201 LEGEND ONS - Optical network system PHYSICAL CONNECTION LOGICAL CONNECTIONS 54630 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 2-4 illustrates the ONS 15200 multichannel, point-to-point configurations. Cisco ONS 15200 Product Description 78-13766-01 2-3 Chapter 2 Product Configurations ONS 15200 Network Configurations Note The physical connection in Figure 2-4 consists of two fiber-optic cables. Figure 2-4 Multichannel point-to-point configurations, single and dual connections ONS 15252 ONS 15252 ONS 15252 ONS 15252 SINGLE PHYSICAL CONNECTION DUAL PHYSICAL CONNECTIONS LEGEND ONS - Optical network system 2.1.5 Ring Configuration with Hubbed and Meshed Traffic In the ONS 15200 ring configuration with hubbed and meshed traffic, two ONS 15201 SCUs communicate with each other. You can use either unit in a direct point-to-point configuration through a control area network (CAN) bus connection as shown in Figure 2-5, or with a noninterfering ONS 15252 MCU. If you use an ONS 15252 MCU, the MCU must have an installed Bridge module (BM). To manage a mesh configuration, use the Maintenance Manager (MM) software and associated hardware or use a CAN bus extension cable to connect one of the ONS 15201 SCUs using the meshed channel to the ONS 15252 MCU. An ONS 15201 SCU connected in this way will be on the same logical CAN bus as the ONS 15252 MCU. In the mesh configuration, you can configure SONET or SDH ADM ring protection on the client side of the meshed channel. If you use client-layer 1+1 APS protection, you must replace each of the ONS 15201 SCUs with a pair of ONS 15201 SCUs transmitting in opposite directions. Figure 2-5 illustrates the ONS 15200 ring configuration with hubbed and meshed traffic. 54632 Note The physical connection in Figure 2-5 consists of two fiber-optic fiber cables. 2-4 Cisco ONS 15200 Product Description 78-13766-01 Chapter 2 Product Configurations Figure 2-5 Ring configuration with hubbed and meshed traffic ONS 15252 PHYSICAL ONS 15200 Network Configurations ONS 15201 ONS 15201 CONNECTION LOGICAL CONNECTIONS ONS 15201 ONS 15201 ONS 15201 ONS 15201 ONS 15201 ONS 15201 LEGEND ONS - Optical network system 2.1.6 Full-Mesh Configuration In the ONS 15200 full-mesh configuration, all ONS 15252 MCUs communicate with each other. A single Network Control Board (NCB) module located in one of the ONS 15252 MCUs manages the full-mesh configuration. The NCB modules in the other ONS 15252 MCUs are not used; an NCB front cover replaces them. In the full-mesh configuration, you can configure SONET or SDH ADM ring protection on the client side of the units. Layer-3 load sharing is supported. To implement client-layer 1+1 APS protection, you must replace each of the units with a pair of units transmitting in opposite directions of the ring. Figure 2-6 illustrates the ONS 15200 full-mesh configuration. 54633 Note The physical connection in Figure 2-6 consists of two fiber-optic cables. Cisco ONS 15200 Product Description 78-13766-01 2-5 Chapter 2 Product Configurations Network Protection Figure 2-6 Four ONS 15252 MCUs in a full-mesh configuration ONS 15252 PHYSICAL CONNECTION LOGICAL CONNECTIONS ONS 15252 ONS 15252ONS 15252 LEGEND ONS - Optical network system 2.2 Network Protection Release 1.1 provides the Forward Defect Indication (FDI) switch (fdi_switch), which can be enabled or disabled. When fdi_switch is enabled, the FDI alarm causes the traffic to switch paths. A CLIP receives the FDI alarm if and only if its companion CLIP loses its client-side input signal. The severity of the FDI alarm is minor. 54646 2-6 Cisco ONS 15200 Product Description 78-13766-01 CHAPTER 3 CHAPTER 3 Product Hardware This chapter describes the Cisco ONS 15...