Chapter 7 Circuits and Tunnels

7.2.3 Circuit States

Table 7-2

ONS 15600 Circuit Status (continued)

 

 

 

Status

 

Definition/Activity

 

 

DISCOVERED_TL1

A TL1-created circuit or a TL1-like, CTC-created circuit is

 

 

complete. A complete path from source to destination(s)

 

 

exists.

 

 

 

PARTIAL_TL1

 

A TL1-created circuit or a TL1-like, CTC-created circuit is

 

 

missing a cross-connect or circuit span (network link), and

 

 

a complete path from source to destination(s) does not exist.

 

 

CONVERSION_PENDING

An existing circuit in a topology upgrade is set to this state.

 

 

The circuit returns to the DISCOVERED state when the

 

 

topology upgrade is complete. For more information about

 

 

topology upgrades, see Chapter 8, “SONET Topologies and

 

 

Upgrades.”

 

 

PENDING_MERGE

Any new circuits created to represent an alternate path in a

 

 

topology upgrade are set to this status to indicate that it is a

 

 

temporary circuit. These circuits can be deleted if a topology

 

 

upgrade fails. For more information about topology

 

 

upgrades, see Chapter 8, “SONET Topologies and

 

 

Upgrades.”

 

 

DROP_PENDING

A circuit is set to this status when a new circuit drop is being

 

 

added.

 

 

 

Note If an ONS 15600 node is running Software R5.0.2, it is in a BLSR with an ONS 15454 node running Software R7.0 or later, and the login node is running Software R7.0 or later, the Protection column in the CTC Circuits window will show “Unknown” and the Status column will show “CONVERSION_PENDING.” This status occurs until the ONS 15600 node is running Release 7.0 or later software.

7.2.3 Circuit States

The circuit service state is an aggregate of the cross-connect states within the circuit.

•If all cross-connects in a circuit are in the IS-NR service state, the circuit service state is In-Service (IS).

•If all cross-connects in a circuit are in an OOS service state, such as OOS-MA,MT; Out-of-Service and Autonomous, Automatic In-Service (OOS-AU,AINS); or Out-of-Service and Management, Disabled (OOS-MA,DSBLD) service state, the circuit service state is Out-of-Service (OOS).

•PARTIAL is appended to the OOS circuit service state when circuit cross-connects state are mixed and not all in IS-NR. The OOS-PARTIAL state can occur during automatic or manual transitions between states. OOS-PARTIAL can appear during a manual transition caused by an abnormal event such as a CTC crash or communication error, or if one of the cross-connects could not be changed. Refer to the Cisco ONS 15600 Troubleshooting Guide for troubleshooting procedures.

You can assign a service state to circuit cross-connects at two points:

•During circuit creation, you can set the state on the Create Circuit wizard.

Cisco ONS 15600 Reference Manual, R7.2

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Cisco Systems ONS 15600 manual Circuit States
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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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