Chapter 2 Alarm Troubleshooting

Alarm Procedures

The Span Switch is Active West Side (SPAN-SW-WEST) condition occurs when a span switch occurs at the west side of a BLSR span. The condition clears when the switch is cleared.

Note SPAN-SW-EAST is an informational condition. It does not require troubleshooting.

2.6.158 SQUELCH

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

The Ring Squelching Traffic (SQUELCH) condition occurs in a BLSR when a node that originates or terminates STS circuits fails or is isolated by multiple fiber cuts or maintenance FORCE RING commands. The isolation or failure of the node disables circuits that originate or terminate on the failed node. Squelch alarms appear on one or both of the nodes on either side of the isolated/failed node. The AIS-P condition (see page 2-17)also appears on all nodes in the ring except the isolated node.

Warning Invisible laser radiation might be emitted from the end of the unterminated fiber cable or connector. Do not stare into the beam directly with optical instruments. Viewing the laser output with certain optical instruments (for example, eye loupes, magnifiers, and microscopes) within a distance of 100

mmmight pose an eye hazard. Use of controls or adjustments or performance of procedures other than those specified might result in hazardous radiation exposure.

Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15327. Plug the wristband cable into the ESD jack located between the top high-speed and XTC slots.

Procedure: Clear the SQUELCH Condition

Step 1 Determine the isolated node:

a.In node view, click View > Go to Network View.

b.The grayed out node with red spans is the isolated node.

Step 2 Verify fiber continuity to the ports on the isolated node.

Step 3 If fiber continuity is correct, verify that the proper ports are in service (IS):

a.Confirm that the OC-N card shows a green LED in CTC or on the physical card. A green LED indicates an active card. An amber LED indicates a standby card.

b.To determine whether the OC-N port is in service, double-click the card in CTC to display the card view.

c.Click the Provisioning > Line tabs.

d.Verify that the State column lists the port as in service (IS).

e.If the State column lists the port as OOS, click the column and choose IS. Click Apply.

Step 4 If the correct ports are in service, use an optical test set to verify that a valid signal exists on the line.

For specific procedures to use the test set equipment, consult the manufacturer. Test the line as close to the receiving card as possible.

 

 

Cisco ONS 15327 Troubleshooting Guide, R3.4

 

 

 

 

 

 

March 2004

 

 

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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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