Chapter 1 General Troubleshooting

1.2.4 Perform a Hairpin Test on a Destination-Node Port

Step 3 If the test set indicates a good circuit, no further testing is necessary on the loopback circuit. Clear the terminal loopback:

a.Double-click the 15310-CL-CTX or CTX2500 in the destination node with the terminal loopback.

b.Double-click the appropriate card containing the electrical circuit you are testing, and click the appropriate tab:

•Maintenance > DS1 > Loopback

•Maintenance > DS3 > Loopback

•Maintenance > EC1 > Loopback

c.Select None from the Loopback Type column for the port being tested.

d.Select the appropriate state (IS,AINS,AINS OOS,DSBLD or OOS,MT) in the Admin State column for the port being tested.

e.Click Apply.

f.Click Yes in the confirmation dialog box.

Step 4 Clear the terminal loopback circuit:

a.Click the Circuits tab.

b.Choose the loopback circuit being tested.

c.Click Delete.

d.Click Yes in the Delete Circuits dialog box.

Step 5 If the test set indicates a faulty circuit, the problem might be a faulty port. Continue with the “1.2.4 Perform a Hairpin Test on a Destination-Node Port” procedure on page 1-10.

1.2.4 Perform a Hairpin Test on a Destination-Node Port

The hairpin test is performed on the port in the destination node. To perform this test, you must also create a bidirectional circuit in the transmit direction from the destination ONS 15310-CL or ONS 15310-MA to the source node. Creating the bidirectional circuit and completing a successful hairpin eliminates the possibility that the source port, destination port, or fiber span is responsible for the faulty circuit.

Create the Hairpin Loopback Circuit on the Destination-Node Port

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

Use appropriate cabling to attach the Tx and Rx terminals of the electrical test set to the electrical cabling panel for the port you are testing.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to set up the source loopback circuit on the port being tested:

a.Click the Circuits tab and click Create.

b.Give the circuit an easily identifiable name, such as Hairpin1.

c.Set the circuit Type and Size to the normal preferences, such as STS and STS1.

d.Leave the Bidirectional check box checked and click Next.

Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0

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Cisco Systems ONS 15310-CL, ONS 15310-MA manual Perform a Hairpin Test on a Destination-Node Port
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ONS 15310-CL, ONS 15310-MA specifications

Cisco Systems has long been a leader in networking and telecommunications technology, and among its impressive lineup of products, the Cisco ONS 15310 series stands out as an essential solution for optical networking. This series includes models such as the ONS 15310-MA, ONS 15310-CL, and ONS 15310-CA, each designed to meet the diverse needs of service providers and enterprises seeking to enhance their optical transport networks.

The Cisco ONS 15310-MA is an advanced multi-service platform designed for metropolitan area networks. It facilitates the seamless transport of data, voice, and video over optical networks. One of its main features is its ability to support a variety of interfaces, including Ethernet, SONET/SDH, and Wavelength Division Multiplexing (WDM), allowing users to integrate multiple services into a single platform. Additionally, the ONS 15310-MA supports advanced traffic management and Quality of Service (QoS) features to prioritize critical applications and ensure consistent performance.

The ONS 15310-CL variant is tailored for more specific applications, providing enhanced capabilities aimed at delivering carrier-grade services. It features a robust architecture that accommodates high-capacity traffic without compromising reliability. This model emphasizes low power consumption and a compact design, making it suitable for deployment in space-constrained environments. The ONS 15310-CL also supports a wide range of optical interfaces, making it highly flexible for various network configurations.

In terms of technologies, the Cisco ONS 15310 series leverages Optical Transport Network (OTN) capabilities, providing high efficiency and greater bandwidth utilization. OTN technology enables efficient error correction and adds resilience to the network through its built-in protection mechanisms. Furthermore, the series supports seamless integration with existing IP/MPLS networks, creating a cohesive infrastructure as organizations evolve their networking requirements.

One of the defining characteristics of the ONS 15310 series is its focus on scalability. Network operators can start with a modest deployment and gradually expand capacity as demand grows. This adaptability is complemented by Cisco's comprehensive management and monitoring tools, providing operators with real-time insights into network performance and facilitating proactive management.

In conclusion, the Cisco ONS 15310-MA and ONS 15310-CL models represent sophisticated solutions for modern optical networks. With their versatile features, advanced technologies, and robust design, they empower service providers and enterprises to build resilient, high-capacity networks that meet the demands of today’s data-driven world.
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