Chapter 2 Alarm Troubleshooting

2.7.148 LOS (EC1)

Step 3 If the port is not currently assigned, place the port out of service using the following steps:

a.In node view, double-click the card to display the card view.

b.Click the Maintenance > DS3 tabs.

c.In the Admin State column, click OOS,DSBLD.

d.Click Apply.

Step 4 If the port is assigned, verify that the correct port is in service by completing the following steps:

a.To confirm this physically, confirm that the green ACT LED is on.

b.To determine this virtually, double-click the card in CTC to display the card view and complete the following substeps:

•Click the Provisioning > DS3 > Line tabs.

•Verify that the Admin State column lists the port as IS.

•If the Admin State column lists the port as OOS,MT or OOS,DSBLD, click the column and choose IS. Click Apply.

Note If ports managed into IS administrative state are not receiving signals, the LOS alarm is

either raised or remains, and the port service state transitions to OOS-AU,FLT.

Step 5 Use a test set to confirm that a valid signal exists on the line. Test the line as close to the receiving port as possible. For specific procedures to use the test set equipment, consult the manufacturer.

Step 6 Ensure that the transmit and receive outputs from the DSx panel to your equipment are properly connected. For more information about cable connections and terminations, refer to the “Install Hardware” chapter in the Cisco ONS 15310-CL and Cisco ONS 15310-MA Procedure Guide.

Step 7 If a valid signal is not present and the transmitting device is operational, replace the cable connecting the transmitting device to the port. To do this, refer to the “Install Hardware” chapter in the

Cisco ONS 15310-CL and Cisco ONS 15310-MA Procedure Guide for procedures. For more information about the cards, refer to the Cisco ONS 15310-CL and Cisco ONS 15310-MA Ethernet Card Software Feature and Configuration Guide.

Step 8 Repeat Steps 1 to 7 for any other port on the card that reports the LOS.

Step 9 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.

2.7.148 LOS (EC1)

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

SONET Logical Object: EC1

LOS on a 15310-CL-CTX, DS1-28/DS3-EC1-3, or DS1-84/DS3-EC1-3 card EC-1 port occurs when a SONET receiver detects an all-zero pattern for 10 microseconds or longer. An LOS (EC1) most likely means that the upstream transmitter has failed. If an EC1 LOS alarm is not accompanied by additional alarms, a cabling problem (such as an incorrect attachment, a fiber cut, or another fiber error) usually causes this alarm. The condition clears when the problem is corrected, allowing two consecutive valid frames to be received.

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 LOS EC1, Click the Maintenance DS3 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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