Chapter 2 Alarm Troubleshooting

Alarm Procedures

For UPSR protected circuits, the BER threshold on the ONS 15327 is user provisionable and has a range for SD from 10–9to 10–5. For BLSR 1+1 and unprotected circuits, the BER threshold value is not user provisionable and the error rate is hard-coded to 10–6.

On UPSR, an SD-P condition causes a switch from the working card to the protect card at the path (STS) level. On BLSR 1+1 or on unprotected circuits, an SD-P condition does not cause switching.

The BER increase that causes the alarm is sometimes caused by a physical fiber problem such as a poor fiber connection, a bend in the fiber that exceeds the permitted bend radius, or a bad fiber splice.

Signal degrade and signal fail both monitor the incoming BER and are similar alarms, but SD is triggered at a lower bit error rate than SF. SD causes the card to switch from working to protect. The SD alarm clears when the BER level falls to one-tenth of the threshold level that triggered the alarm.

Procedure: Clear the SD-P Condition

Step 1 Complete the “Clear the SD Condition” procedure on page 2-105.

Step 2 If the condition does not clear, log onto http://www.cisco.com/tac for more information or call TAC (1-800-553-2447).

2.6.151 SF

•Not Alarmed (NA), Non-Service Affecting (NSA)

A Signal Fail (SF) condition occurs when the quality of the signal is so poor that the BER on the incoming optical line passed the signal failure threshold. Signal failure is defined by Telcordia as a “hard failure” condition. The SD condition (see page 2-104)and SF both monitor the incoming BER error rate and are similar conditions, but SF is triggered at a higher BER than SD.

The BER threshold on the ONS 15327 is user provisionable and has a range for SF from 10-5 to 10-3.

SF-L causes a switch from the working card to the protect card at the line (facility) level. A line or facility level SF condition travels on the B2 byte of the SONET overhead.

SF causes a card to switch from working to protect at either the path or line level. The SF condition clears when the BER level falls to one-tenth of the threshold level that triggered the condition. A BER increase is sometimes caused by a physical fiber problem, including a poor fiber connection, a bend in the fiber that exceeds the permitted bend radius, or a bad fiber splice.

Procedure: Clear the SF Condition

Step 1 Complete the “Clear the SD Condition” procedure on page 2-105.

Step 2 If the condition does not clear, log onto http://www.cisco.com/tac for more information or call TAC (1-800-553-2447).

2.6.152 SF-L

•Not Alarmed (NA), Non-Service Affecting (NSA)

 

Cisco ONS 15327 Troubleshooting Guide, R3.4

2-106

March 2004

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Cisco Systems ONS 15327 manual 151 SF, Sf-L, Procedure Clear the SD-P Condition, Procedure Clear the SF Condition, 106
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ONS 15327 specifications

Cisco Systems ONS 15327 is a high-performance optical networking solution tailored for service providers and enterprises looking to enhance their optical communication infrastructure. This versatile platform is recognized for its robust performance, scalability, and flexibility, making it suitable for a wide array of applications ranging from broadband access to metropolitan area networking.

One of the standout features of the ONS 15327 is its ability to handle multiple data types over a single platform. It supports a rich array of protocols, including Ethernet and SONET/SDH, allowing service providers to deliver a diverse portfolio of services to their customers. This multiservice capability simplifies the network architecture, reducing operational complexity and costs.

The ONS 15327 is designed with a modular architecture, which enables operators to customize and scale their network as demand grows. It supports a variety of card options for different media types, wavelengths, and capacity requirements. This modularity not only facilitates straightforward upgrades but also allows for efficient network management.

In terms of technology, the ONS 15327 leverages dense wavelength division multiplexing (DWDM) capabilities to maximize the utilization of available fiber bandwidth. This allows for an impressive increase in transmission capacity without the need for additional fiber installations, making it a cost-effective solution for expanding networks.

Another significant characteristic of the Cisco ONS 15327 is its advanced performance monitoring and management features. Built-in diagnostic tools provide real-time visibility into network performance, enabling prompt identification and troubleshooting of potential issues. This proactive approach to network management enhances service reliability and customer satisfaction.

Security is also paramount in the ONS 15327. The platform integrates various security features and protocols to protect the data traversing the network, ensuring compliance with industry standards and safeguarding sensitive information.

Furthermore, the equipment is designed for easy integration into existing infrastructures. Its compatibility with Cisco’s broader networking solutions allows for seamless interconnection with routers, switches, and other devices, facilitating comprehensive network solutions.

In conclusion, Cisco Systems ONS 15327 stands out as a powerful optical networking platform that combines versatility, scalability, and advanced management features. Its ability to support various protocols and harness optical technologies makes it an essential tool for organizations aiming to optimize their telecommunications infrastructure while minimizing costs and complexity.
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