Chapter 1 General Troubleshooting

1.5.1 FEAC Send Code

Note The term "Far End" refers to the equipment connected to the WBE card and not to the far end of a circuit.

1.5.1 FEAC Send Code

The Send Code column on the WBE-28/WBE-84 card Maintenance tab only applies to OOS-MA,MT ports configured for ESF framing. The column lets a user select No Code (the default) or line loop code. Selecting line loop code inserts a line loop activate Far End Loopcode in the ESF overhead transmitting to the connected facility. This code initiates a loopback from the facility to the ONS 15454. Selecting No Code sends a line-loop-deactivate Far End Loopcode to the connected equipment, which will remove the loopback.

1.5.2 WBE-28/WBE-84 Inhibit FEAC Loopback

WBE-28/WBE-84 DS1 ports initiate loopbacks when they receive Far End line loop codes. If the Inhibit FE Lbk check box is checked for a DS1 port, that port ignores any Far End line loop codes it receives and will not loop back. If you inhibit a DS1 port's far end loopback response, this DS1 port is not restricted from terminal or facility loopbacks.

1.6 Troubleshooting Ethernet Circuit Paths With Loopbacks

Facility loopbacks, terminal loopbacks, and cross-connect loopback circuits are often used together to test the circuit path through the network or to logically isolate a fault. Performing a loopback test at each point along the circuit path systematically isolates possible points of failure.

When performing this testing on networks that contain intermediate nodes, you will test the OC-N connection at intermediate nodes rather than CE100T-8 card connections. (The CE100T-8 is a mapper card and is only capable of supporting point-to-point circuits.)

You can use these procedures on CE100T-8 cards but not on ML-100T-8 Ethernet cards. Using a series of facility loopbacks and terminal loopbacks, the example scenario traces the circuit path, tests the possible failure points, and eliminates them. The logical progression contains six network test procedures:

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

1.A facility loopback on the source-node Ethernet port

2.A terminal loopback on the source-node Ethernet port

3.A facility loopback on the intermediate-node OC-N port

4.A terminal loopback on the intermediate-node OC-N port

5.A facility loopback on the destination-node Ethernet port

6.A terminal loopback on the destination-node Ethernet port

Note Facility and terminal loopback tests require on-site personnel.

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 Troubleshooting Ethernet Circuit Paths With Loopbacks
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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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