Chapter 2 Alarm Troubleshooting

2.7.135 LOF (OCN)

The EC1-1 LOF alarm occurs when a port on the reporting EC-1 port has an LOF condition. LOF indicates that the receiving ONS 15310-CL or ONS 15310-MA has lost frame delineation in the incoming data. LOF occurs when the SONET overhead loses a valid framing pattern for 3 milliseconds. Receiving two consecutive valid A1/A2 framing patterns clears the alarm.

Clear the LOF (EC1) Alarm

Step 1 Verify cabling continuity to the port reporting the alarm. To verify cable continuity, follow site practices.

Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15310-CL or ONS 15310-MA.

Step 2 If cabling continuity is good, clean the fiber according to site practice. If no site practice exists, complete the procedure in the “Maintain the Node” chapter in the Cisco ONS 15310-CL and

Cisco ONS 15310-MA Procedure Guide.

Step 3 If the alarm does not clear, see the “1.1 Network Troubleshooting Tests” section on page 1-2to isolate the fault causing the LOF alarm.

Step 4 If the alarm does not clear, or if you need assistance conducting network troubleshooting tests, call Cisco TAC to report a Service-Affecting (SA) problem (1-800-553-2447).

2.7.135 LOF (OCN)

Default Severity: Critical (CR), Service-Affecting (SA)

SONET Logical Objects: OCN, STSTRM

The LOF alarm occurs when a port on the reporting port has an LOF condition. The alarm indicates that the receiving ONS 15310-CL or ONS 15310-MA has lost frame delineation in the incoming data. LOF occurs when the SONET overhead loses a valid framing pattern for 3 ms. Receiving two consecutive valid A1/A2 framing patterns clears the alarm.

When the alarm is raised on an OC-3 or OC-12 port, it is sometimes an indication that the OC-3 or OC-12 port expects a specific line rate and the input line rate source does not match the input line rate of the optical receiver.

Clear the LOF (OCN) Alarm

Step 1 Complete the “Clear the LOF (EC1) Alarm” procedure on page 2-88.

Step 2 If the alarm does not clear, or if you need assistance conducting network troubleshooting tests, call Cisco TAC to report a Service-Affecting (SA) problem (1-800-553-2447).

2.7.136 LOF (STSTRM)

Default Severity: Critical (CR), Service-Affecting (SA)

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

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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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