Chapter 7 Circuits and Tunnels

7.1 Overview

Note In this chapter, “cross-connect” and “circuit” have the following meanings: cross-connect refers to the connections that occur within a single ONS 15600 to allow a circuit to enter and exit an ONS 15600. Circuit refers to the series of connections from a traffic source (where traffic enters the ONS 15600 network) to the destination (where traffic exits an ONS 15600 network).

7.1 Overview

You can create circuits across and within ONS 15454 nodes and assign different attributes to circuits. For example, you can:

•Create one-way, two-way (bidirectional), or broadcast circuits.

•Assign user-defined names to circuits.

•Assign different circuit sizes.

•Automatically or manually route circuits.

•Automatically create multiple circuits with autoranging.

•Provide full protection to the circuit path.

•Provide only protected sources and destinations for circuits.

•Define a secondary circuit source or destination that allows you to interoperate an ONS 15600 path protection with third-party equipment path protection configurations.

•Set path protection circuits as revertive or nonrevertive.

You can provision circuits at either of the following points:

•Before cards are installed. The ONS 15600 allows you to provision slot and circuits before installing the traffic cards.

•After you preprovision the small-form factor pluggables (SFPs) (also called provisionable port modules [PPMs]).

•Cards and SFPs are installed and ports are in service. Circuits do not actually carry traffic until the cards and SFPs are installed and the ports are In-Service and Normal (IS-NR); Out-of-Service and Autonomous, Automatic In-Service (OO-AU,AINS); or Out-of-Service and

Management, Maintenance (OOS-MA,MT). Circuits will carry traffic as soon as the signal is received.

7.2Circuit Properties

The ONS 15600 Circuits window (Figure 7-1 on page 7-3), which is available from network, node, and card view, is where you can view information about circuits, including:

•Name—The name of the circuit (user-assigned or automatically generated).

•Type—For the ONS 15600, the circuit type is STS (STS circuit).

•Size—The STS circuit size can be 1, 3c, 12c, 24c, 48c, or 192c. The STS circuit size for ASAP PPM ports also includes 6c and 9c. For time slot availability on concatenated STSs, see the

“7.2.1 Concatenated STS Time Slot Assignments” section on page 7-4.

•Protection—The protection type; see the “7.2.4 Circuit Protection Types” section on page 7-8.

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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.
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