Chapter 1 General Troubleshooting

Identify Points of Failure on a DS-N Circuit Path

Across-connect loopback tests a circuit path as it passes through the cross-connect card and loops back to the port being tested. Testing and verifying circuit integrity often involves taking down the whole line; however, a cross-connect loopback allows you to create a loopback on any embedded channel at supported payloads at the STS-1 granularity and higher. For example, you can loop back a single STS-1, STS-3c, STS-6c, etc., on an optical facility without interrupting the other STS circuits.

You can create a cross-connect loopback on all working or protect optical ports unless the protect port is used in a 1+1 protection group and is in working mode. If a terminal or facility loopback exists on a port, you cannot use the cross-connect loopback. Figure 1-6shows a cross-connect loopback on an OC-N port.

Figure 1-6 Cross-Connect Loopback Process on an OC-N Port

 

OC-Nx

XTC

OC-Ny

Test Set

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1.2 Identify Points of Failure on a DS-N Circuit Path

Note

Note

Note

Facility loopbacks, hairpin circuits, and terminal loopbacks are often used to test a circuit path through the network or to logically isolate a fault. Performing a loopback test at each point along the circuit path systematically isolates possible points of failure.

The example in this section tests an DS-N circuit on a two-node bidirectional line switched ring (BLSR). Using a series of facility loopbacks, hairpin circuits, and terminal loopbacks, the path of the circuit is traced and the possible points of failure are tested and eliminated. A logical progression of network test procedures applies to this scenario:

1.Facility loopback on the source-node XTC port

2.Hairpin on the source-node XTC port

3.Terminal loopback to the destination-node XTC port

4.Hairpin on the destination-node XTC port

5.Facility loopback to the destination XTC port

The test sequence for your circuits differs according to the type of circuit and network topology.

All loopback tests require on-site personnel.

These procedures are performed when power connections to the node(s) or site(s) are assumed to be within necessary specifications. If the network tests do not isolate the problems, troubleshoot outward for power failure.

Cisco ONS 15327 Troubleshooting Guide, R3.4

1-4

April 2003

 

 

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Cisco Systems ONS 15327 Identify Points of Failure on a DS-N Circuit Path, Cross-Connect Loopback Process on an OC-N Port
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ONS 15327 specifications

Cisco Systems ONS 15327 is a high-performance optical networking solution tailored for service providers and enterprises looking to enhance their optical communication infrastructure. This versatile platform is recognized for its robust performance, scalability, and flexibility, making it suitable for a wide array of applications ranging from broadband access to metropolitan area networking.

One of the standout features of the ONS 15327 is its ability to handle multiple data types over a single platform. It supports a rich array of protocols, including Ethernet and SONET/SDH, allowing service providers to deliver a diverse portfolio of services to their customers. This multiservice capability simplifies the network architecture, reducing operational complexity and costs.

The ONS 15327 is designed with a modular architecture, which enables operators to customize and scale their network as demand grows. It supports a variety of card options for different media types, wavelengths, and capacity requirements. This modularity not only facilitates straightforward upgrades but also allows for efficient network management.

In terms of technology, the ONS 15327 leverages dense wavelength division multiplexing (DWDM) capabilities to maximize the utilization of available fiber bandwidth. This allows for an impressive increase in transmission capacity without the need for additional fiber installations, making it a cost-effective solution for expanding networks.

Another significant characteristic of the Cisco ONS 15327 is its advanced performance monitoring and management features. Built-in diagnostic tools provide real-time visibility into network performance, enabling prompt identification and troubleshooting of potential issues. This proactive approach to network management enhances service reliability and customer satisfaction.

Security is also paramount in the ONS 15327. The platform integrates various security features and protocols to protect the data traversing the network, ensuring compliance with industry standards and safeguarding sensitive information.

Furthermore, the equipment is designed for easy integration into existing infrastructures. Its compatibility with Cisco’s broader networking solutions allows for seamless interconnection with routers, switches, and other devices, facilitating comprehensive network solutions.

In conclusion, Cisco Systems ONS 15327 stands out as a powerful optical networking platform that combines versatility, scalability, and advanced management features. Its ability to support various protocols and harness optical technologies makes it an essential tool for organizations aiming to optimize their telecommunications infrastructure while minimizing costs and complexity.
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