Chapter 1 General Troubleshooting

1.2.5 Perform a Facility Loopback on a Destination Port

1.2.5 Perform a Facility Loopback on a Destination Port

The final facility loopback test is performed on the last port in the circuit— in this case the port in the destination node. Completing a successful facility loopback on this port isolates the possibility that the destination-node cabling, card, or LIU is responsible for a faulty circuit.

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

Note Loopbacks operate only on ports in the OOS,MT administrative state.

Create a Facility Loopback Circuit on a Destination Port

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

a.If you just completed the “1.2.4 Perform a Hairpin Test on a Destination-Node Port” procedure on page 1-10, leave the electrical test set connected to the electrical port in the destination node.

b.If you are starting the current procedure without the electrical test set connected to the electrical port, use appropriate cabling to attach the Tx and Rx terminals of the electrical test set to the electrical interface panel.

c.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, then click the appropriate tab:

•Maintenance > DS1 > Loopback

•Maintenance > DS3 > Loopback

•Maintenance > EC1 > Loopback

b.Select Facility from the Loopback Type column for the port being tested. If you are creating a loopback on a multiport card, select the row appropriate for the desired port.

c.Click Apply.

d.Click Yes in the confirmation dialog box.

Note It is normal for a 2.7.156 LPBKFACILITY (DS1, DS3) or 2.7.157 LPBKFACILITY (EC1) condition to appear during loopback setup. The condition clears when you remove the loopback.

Step 3 Continue with the “Test the Facility Loopback Circuit” procedure on page 1-13.

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 Facility Loopback on a Destination 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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