Chapter 8 SONET Topologies and Upgrades

8.2 Point-to-Point and Linear ADM Configurations

8.2 Point-to-Point and Linear ADM Configurations

You can configure ONS 15600s as a line of add/drop multiplexers (ADMs) by configuring one OC-N port as the working path and a second port as the protect path. Unlike rings, point-to-point (two node configurations) and linear (three node configurations) ADMs require that the OC-N ports at each node are in 1+1 protection to ensure that a break to the working path automatically routes traffic to the protect path.

Figure 8-1shows two ONS 15600 nodes in a point-to-point ADM configuration. Working traffic flows from Slot 1/Port 1 at Node 1 to Slot 1/Port 1 at Node 2. You create the protect path by creating a 1+1 configuration with Slot 1/Port 1 and Slot 2/Port 1 at Nodes 1 and 2.

Figure 8-1 Point-to-Point ADM Configuration

Slot 1/Port 1 to Slot 1/Port 1

Slot 2/Port 1 to Slot 2/Port 1

Node 1

98292

Node 2

Working Path

Protect Path

8.3 Bidirectional Line Switched Rings

The ONS 15600 can support up to 32 bidirectional line switched rings (BLSRs). Eight four-fiber BLSR rings can be supported if all ports are OC-192. Because the working and protect bandwidths must be equal, you can create only OC-48 or OC-192 BLSRs. For information about BLSR protection channels, see the “7.7 Protection Channel Access Circuits” section on page 7-15.

Note For best performance, BLSRs should have one LAN connection for every ten nodes in the BLSR.

8.3.1 Two-Fiber BLSRs

In two-fiber BLSRs, each fiber is divided into working and protect bandwidths. For example, in an OC-48 BLSR, STSs 1 to 24 carry the working traffic, and STSs 25 to 48 are reserved for protection (Figure 8-2). Working traffic (STSs 1 to 24) travels in one direction on one fiber and in the opposite direction on the second fiber. Cisco Transport Controller (CTC) circuit routing routines calculate the shortest path for circuits based on many factors, including user requirements, traffic patterns, and distance. For example, in Figure 8-2, circuits going from Node 0 to Node 1 will typically travel on Fiber 1, unless that fiber is full, in which case circuits will be routed to Fiber 2 through Node 3 and Node 2. Traffic from Node 0 to Node 2 (or Node 1 to Node 3) can be routed on either fiber, depending on circuit provisioning requirements and traffic loads.

Cisco ONS 15600 Reference Manual, R7.2

8-2

Page 147 Page 149
Page 148
Image 148
Cisco Systems ONS 15600 Point-to-Point and Linear ADM Configurations, Bidirectional Line Switched Rings, Two-Fiber BLSRs
Page 147 Page 149

ONS 15600 specifications

Cisco Systems ONS 15600 is a highly versatile optical networking platform designed to meet the demands of modern telecommunications and data services. This multiservice edge platform supports various transmission mediums and offers a wide array of features that enable efficient data transport. Ideal for service providers and large enterprises, the ONS 15600 is engineered to provide scalable and reliable optical transport solutions.

One of the notable features of the ONS 15600 is its capability to support multiple protocols, including SONET/SDH, Ethernet, OTN, and legacy TDM services. This flexibility allows users to tailor their networks according to specific service requirements while ensuring interoperability with existing infrastructure. The platform is designed to facilitate seamless service migration, accommodating both legacy and next-generation services.

The modular architecture of the ONS 15600 enhances its scalability. It allows for easy expansion by incorporating additional line cards or interface modules without requiring significant downtime. This modularity ensures that service providers can evolve their networks over time, responding to increasing bandwidth demands and new service offerings with ease.

Incorporating advanced technologies, the ONS 15600 employs Dense Wavelength Division Multiplexing (DWDM), significantly increasing the capacity of fiber networks by allowing multiple signals to be transmitted simultaneously over a single optical fiber. This capability helps to optimize fiber utilization and reduce operational costs. In addition, the platform supports Optical Transport Network (OTN) for improved error detection and correction, contributing to higher reliability and performance.

Another key characteristic of the ONS 15600 is its robust management capabilities. The platform can be managed through Cisco's Optical Networking Manager (ONM), providing a centralized interface for network configuration, monitoring, and troubleshooting. This enhances operational efficiency and minimizes downtime, allowing service providers to focus on delivering quality services to their customers.

The ONS 15600 also prioritizes security, offering various features like encryption and access control to safeguard sensitive data during transmission. With its combination of scalability, flexibility, and security, the Cisco ONS 15600 stands out as a reliable choice for organizations looking to enhance their optical networking capabilities while meeting the evolving demands of the digital landscape. Its commitment to quality and performance makes it a cornerstone of modern optical networks.
Top Page Image Contents