Chapter 7 Circuits and Tunnels

7.10 Automatic Circuit Routing

Table 7-6

ONS 15600 Cards Supporting J1 Path Trace

 

 

 

 

Card

 

Receive

Transmit

 

 

 

OC48/STM16 SR/SH 16 Port 1310

Yes

No

 

 

 

OC48/STM16 LR/LH 16 Port 1550

Yes

No

 

 

 

OC192/STM64 SR/SH 4 Port 1310

Yes

No

 

 

 

OC192/STM64 LR/LH 4 Port 1550

Yes

No

 

 

 

ASAP OC-N ports

Yes

No

 

 

 

ASAP Ethernet ports

Yes

Yes

 

 

 

 

SONET J0 section trace is not supported on ONS 15600 cards

The ONS 15600 supports both automatic and manual J1 path trace monitoring to detect and report the contents of the 64-byte STS path trace message (nonterminated) for the designated STS path.

•Automatic—The receiving port assumes that the first J1 string it receives is the baseline J1 string.

•Manual—The receiving port uses a string that you manually enter as the baseline J1 string.

Note When J1 path trace is enabled on a two-fiber BLSR circuit, CTC will not retrieve the path trace information from the card view Maintenance > Path Trace subtab.

7.10 Automatic Circuit Routing

If you select automatic routing during circuit creation, CTC routes the circuit by dividing the entire circuit route into segments based on protection domains. For unprotected segments of circuits provisioned as fully protected, CTC finds an alternate route to protect the segment, creating a virtual path protection. Each segment of a circuit path is a separate protection domain. Each protection domain is protected in a specific protection scheme including card protection (1+1) or SONET topology (path protection or BLSR).

The following list provides principles and characteristics of automatic circuit routing:

•Circuit routing tries to use the shortest path within the user-specified or network-specified constraints.

•If you do not choose fully path protected during circuit creation, circuits can still contain protected segments. Because circuit routing always selects the shortest path, one or more links and/or segments can have some protection. CTC does not look at link protection while computing a path for unprotected circuits.

•Circuit routing does not use links that are down. If you want all links to be considered for routing, do not create circuits when a link is down.

•Circuit routing computes the shortest path when you add a new drop to an existing circuit. It tries to find the shortest path from the new drop to any nodes on the existing circuit.

Cisco ONS 15600 Reference Manual, R7.2

7-18

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Cisco Systems ONS 15600 manual Automatic Circuit Routing, Card Receive Transmit
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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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