Chapter 1 General Troubleshooting

1.2.1 Perform a Facility Loopback on a Source-Node Port

Note

Note

Note

The tests in this section can be used to test DS-1, DS-3, or EC-1 circuits on a path protection. 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 port

2.Hairpin on the source-node port

3.Terminal loopback to the destination-node port

4.Hairpin on the destination-node port

5.Facility loopback to the destination-node port

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

Facility and terminal loopback tests require on-site personnel.

These procedures are performed when power connections to the nodes or sites are within necessary specifications. If the network tests do not isolate the problems, troubleshoot outward for power failure.

1.2.1 Perform a Facility Loopback on a Source-Node Port

The facility loopback test is performed on the node source port in the network circuit. Completing a successful facility loopback on this port isolates the cabling and port as possible failure points.

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) administrative state and Out-of-Service and Management, Maintenance (OOS-MA,MT) service state. Brief instructions are given in each procedure for changing the port’s state. For more information about port state, refer to the Cisco ONS 15310-CL and Cisco ONS 15310-MA Procedure Guide.

Create the Facility Loopback on the Source-Node Port

Step 1 Connect an electrical test set to the DS-1, DS-3, or EC-1 port you are testing. For the ONS 15310-CL, this port is located on the 15310-CL-CTX. For the ONS 15310-MA, this port is located on the DS1-28/DS3-EC1-3 or DS1-84/DS3-EC1-3.

Use appropriate cabling to attach the transmit (Tx) and receive (Rx) terminals of the electrical test set to the port.

Step 2 Adjust the test set accordingly.

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 Source-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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