Chapter 2 Alarm Troubleshooting

2.7.133 LOF (DS3)

f.Verify that the reporting Line Coding matches the signal source line coding (AMI and AMI or B8ZS and B8ZS). If the signal source line coding does not match the reporting port, click the Line Coding cell and choose the correct type from the drop-down list.

g.Click Apply.

Note On the Line tab, the B8ZS coding field is normally paired with ESF in the Line Type field. AMI coding is normally paired with SF (D4) in the Line Type field.

Step 2 If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport for more information or call Cisco TAC (1-800-553-2447) in order to report a Service-Affecting (SA) problem.

2.7.133 LOF (DS3)

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

SONET Logical Object: DS3

The DS-3 LOF alarm indicates that the receiving 15310-CL-CTX, DS1-28/DS3-EC1-3, or DS1-84/DS3-EC1-3 port has lost frame delineation in the incoming DS-3 data stream. The framing of the transmitting equipment could be set to a format that differs from the receiving system. On DS-3 ports, the alarm occurs only on when the provisionable line type format set to C bit or M13.

Clear the LOF (DS3) Alarm

Step 1 Change the line type of the non-ONS equipment attached to the reporting port to C bit by completing the following steps:

a.Double-click the 15310-CL-CTX, or DS1-28/DS3-EC1-3, or DS1-84/DS3-EC1-3 port to display the card view.

b.Click the Provisioning > DS3 > Line tabs.

c.Verify that the line type of the reporting port matches the line type of the signal source.

d.If the signal source line type does not match the reporting port, click Line Type and choose C Bit from the drop-down list.

e.Click Apply.

Step 2 If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport for more information or call Cisco TAC (1-800-553-2447) in order to report a Service-Affecting (SA) problem.

2.7.134 LOF (EC1)

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

SONET Logical Object: EC1

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

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Cisco Systems ONS 15310-MA, ONS 15310-CL manual LOF EC1, Clear the LOF DS3 Alarm
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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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