Chapter 1 General Troubleshooting

1.2.4 Perform a Hairpin Test on a Destination-Node Port

e.In the Circuit Source dialog box, fill in the source Node, Slot, Port, and Type where the test set is connected and click Next.

f.In the Circuit Destination dialog box, fill in the destination Node, Slot, Port, and Type (the port in the destination node) and click Finish.

Step 4 Confirm that the newly created circuit appears on the Circuits tab list as a two-way circuit. Step 5 Use CTC to set up the destination hairpin circuit on the port being tested.

Note The destination loopback circuit on a port is a one-way test.

For example, in a typical east-to-west slot configuration, a DS-3 port on the source node is one end of the fiber span, and a DS-3 port on the destination node is the other end.

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.Uncheck the Bidirectional check box and click Next.

e.In the Circuit Source dialog box, select the same Node, Slot, Port, and Type where the previous circuit is connected and click Next.

f.In the Circuit Destination dialog box, use the same Node, Slot, Port, and Type used for the Circuit Source dialog box and click Finish.

Step 6 Confirm that the newly created circuit appears on the Circuits tab list as a one-way circuit.

Step 7 Verify that the circuits connect to the correct slots. For example, verify that source node OC-N port (east slot) is connected to the destination node (west slot). If two east slots or two west slots are connected, the circuit does not work. Except for the distinct slots, all other circuit information, such as ports, should be identical.

Step 8 Continue with the “Test the Hairpin Circuit” procedure on page 1-11.

Test the Hairpin Circuit

Step 1 If the test set is not already sending traffic, send test-set traffic on the loopback circuit.

Step 2 Examine the test traffic received by the test set. Look for errors or any other signal information indicated by the test set.

Step 3 If the test set indicates a good circuit, no further testing is necessary; clear the hairpin circuit:

a.Click the Circuits tab.

b.Choose the hairpin circuit being tested.

c.Click Delete.

d.Click Yes in the Delete Circuits dialog box.

e.Confirm that the hairpin circuit is deleted from the Circuits tab list.

f.Continue with the “1.2.5 Perform a Facility Loopback on a Destination Port” procedure on page 1-12.

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

1-11

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Cisco Systems ONS 15310-MA, ONS 15310-CL manual Continue with the Test the Hairpin Circuit procedure on
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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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