Chapter 2 Alarm Troubleshooting

2.7.132 LOF (DS1)

b.Find the coding and framing formats of the external BITS timing source. The formats should be in the user documentation for the external BITS timing source or on the timing source itself.

c.Click the Provisioning > Timing > BITS Facilities tabs.

d.Verify that the Coding setting matches the coding of the BITS timing source, either B8ZS or AMI.

e.If the coding does not match, click Coding and choose the appropriate coding from the drop-down list.

f.Verify that Line Type matches the line type of the BITS timing source, either ESF or SF (D4).

g.If the line type does not match, click Line Type and choose the appropriate framing from the drop-down list.

Note On the timing subtab, the B8ZS coding field is normally paired with ESF in the Line Type field and the AMI coding field 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.

2.7.132 LOF (DS1)

Default Severity: Major (MJ), Service-Affecting (SA)

SONET Logical Object: DS1

The DS-1 LOF alarm indicates that the receiving ONS 15310-CL or ONS 15310-MA has lost frame delineation in an incoming DS-1 data stream. If the LOF appears on a DS-1 port, the transmitting equipment could have its line type set to a format that differs from the receiving node.

Note When the ONS 15310-MA raises an LOF (DS1) or LOS (DS1) alarm, a path protection switch will occur, but a PDI-P alarm will not be generated due to hardware limitations.

Clear the LOF (DS1) Alarm

Step 1 Verify that the line type and line coding match between the DS-1 port and the signal source by completing the following steps:

a.In CTC, note the slot and port reporting the alarm.

b.Find the coding and line type formats of the signal source for the port reporting the alarm. You might need to contact your network administrator for the format information.

c.Display the card view of the reporting DS-1 card (15310-CL-CTX, DS1-28/DS3-EC1-3, or DS1-84/DS3-EC1-3).

d.Click the Provisioning > DS1 > Line tabs.

e.Verify that the line type of the reporting port matches the line type of the signal source (DS4 and DS4, unframed and unframed, or ESF and ESF). If the signal source line type does not match the reporting port, click the Line Type cell to reveal a drop-down list and choose the matching type.

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 Clear the LOF DS1 Alarm, Click the Provisioning Timing Bits Facilities tabs
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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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