Chapter 7 Circuits and Tunnels

7.8 BLSR STS and VT Squelch Tables

•PCA circuits are routed on working channels when you upgrade a BLSR from one optical speed to a higher optical speed. For example, if you upgrade a two-fiber OC-48 BLSR to an OC-192, STSs 25 to 48 on the OC-48 BLSR become working channels on the OC-192 BLSR.

7.8BLSR STS and VT Squelch Tables

If a ONS 15600 is on a network with ONS 15454 and ONS 15327 nodes, it is possible to display STS and VT squelch tables on the ONS 15454 and ONS 15327 nodes depending on the type of circuits created. For example, if a fiber cut occurs, the BLSR squelch tables show STSs or VTs that will be squelched for every isolated node. Squelching replaces traffic by inserting the appropriate alarm indication signal path (AIS-P) and prevents traffic misconnections. For an STS with a VT-access check mark, the AIS-P will be removed after 100 ms. To view the squelch tables, refer to the “Manage Circuits” chapter in the Cisco ONS 15454 Procedure Guide for detailed instructions. For more information about BLSR squelching, refer to Telcordia GR-1230.

7.8.1 BLSR STS Squelch Table

BLSR STS squelch tables show STSs that will be squelched for every isolated node.

The BLSR Squelch Table window displays the following information:

•STS Number—Shows the BLSR STS numbers. For two-fiber BLSRs, the number of STSs is half the BLSR OC-N, for example, an OC-48 BLSR squelch table will show 24 STSs. For four-fiber BLSRs, the number of STSs in the table is the same as the BLSR OC-N.

•West Source—If traffic is received by the node on its west span, the BLSR node ID of the source appears. (To view the BLSR node IDs for all nodes in the ring, click the Ring Map button.)

•West VT (from the West Source) — A check mark indicates that the STS carries incoming VT traffic. The traffic source is coming from the west side.

•West VT (from the West Destination) — A check mark indicates that the STS carries outgoing VT traffic. The traffic is dropped on the west side.

•West Dest—If traffic is sent on the node’s west span, the BLSR node ID of the destination appears.

•East Source—If traffic is received by the node on its east span, the BLSR node ID of the source appears.

•East VT — (from the East Source) - A check mark indicates that the STS carries incoming VT traffic. The traffic source is coming from the east side.

•East VT — (from the East Destination) - A check mark indicate that the STS carries outgoing VT traffic. The traffic is dropped on the east side.

•East Dest—If traffic is sent on the node’s east span, the BLSR node ID of the destination appears.

Note BLSR squelching is performed on STSs that carry STS circuits only. Squelch table entries will not appear for STSs carrying VT circuits or Ethernet circuits to or from E-Series Ethernet cards provisioned in a multicard Ethergroup.

Cisco ONS 15600 Reference Manual, R7.2

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Cisco Systems ONS 15600 manual Blsr STS and VT Squelch Tables, Blsr STS Squelch Table
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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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