Chapter 1 General Troubleshooting

Identify Points of Failure on a DS-N Circuit Path

1.2.1 Perform a Facility Loopback on a Source XTC Port

The facility loopback test is performed on the node source port in the network circuit; in this example, the test is routed through the MIC card and performed on the XTC port in the source node. Completing a successful facility loopback on this port isolates the cabling, MIC card, and XTC card as possible failure points. Figure 1-7shows an example of a facility loopback on a source node XTC port.

Figure 1-7 Facility Loopback on a Source XTC Port

ONS 15327

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ONS 15327

Destination

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76187

Facility loopback

Caution Performing a loopback on an in-service circuit is service-affecting.

Note Loopbacks operate only on ports in the out of service-maintenance (OOS_MT) state.

Procedure: Create the Facility Loopback on the Source XTC Port

Step 1 Connect an electrical test set to the port you are testing.

Use appropriate cabling to attach the transmit (Tx) and receive (Rx) terminals of the electrical test set to the MIC card, which interfaces with the XTC card. Both Tx and Rx connect to the same port. Adjust the test set accordingly.

Step 2 Use CTC to create the facility loopback on the port being tested:

a.In node view, double-click the card where you are performing the loopback.

b.Click the Maintenance > Loopback tabs.

c.Choose OOS_MT from the State column for the port being tested. If this is a multiport card, select the appropriate row for the port being tested.

d.Choose Facility (Line) from the Loopback Type column for the port being tested. If this is a multiport card, select the appropriate row for the port being tested.

e.Click the Apply button.

f.Click the Yes button in the Confirmation Dialog box.

Note It is normal for a LPBKFACILITY condition to appear during loopback setup. The condition clears when you remove the loopback.

Cisco ONS 15327 Troubleshooting Guide, R3.4

 

April 2003

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Cisco Systems ONS 15327 manual Perform a Facility Loopback on a Source XTC Port, Click the Maintenance Loopback tabs

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.

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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.

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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.