Chapter 2 Alarm Troubleshooting

Alarm Procedures

2.6.49 EOC

•Major (MJ), Non-Service Affecting (NSA)

The SONET DCC Termination Failure (EOC) alarm occurs when the ONS 15327 loses its data communications channel. The DCC is three bytes, D1 through D3, in the SONET overhead that convey information about Operation, Administration, Maintenance, and Provisioning (OAM&P). The

ONS 15327 uses the DCC on the SONET section layer to communicate network management information.

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.

Note If a circuit shows an incomplete state when the EOC alarm is raised, it occurs when the logical circuit is in place and will be able to carry traffic when the DCC termination issue is resolved. You do not need to delete the circuit when troubleshooting this alarm.

Procedure: Clear the EOC Alarm

Step 1 If an LOS (DS-1) alarm (see page 2-82)is also reported, complete the “Clear the LOS (DS-1) Alarm” procedure on page 2-82.

Step 2 If the alarm does not clear on the reporting node, verify the physical connections between the cards and the fiber-optic cables that are configured to carry DCC traffic.

Step 3 If the physical connections are correct and configured to carry DCC traffic, verify that both ends of the fiber span have in-service (IS) ports by checking that the ACT LED on each OC-N card is illuminated.

Step 4 If the ACT LEDs on OC-N cards are illuminated, complete the “Verify or Create Node DCC Terminations” procedure on page 2-126to verify that the DCC is provisioned for the ports at both ends of the fiber span.

Step 5 Repeat Step 4 at the adjacent nodes.

Step 6 If DCC is provisioned for the ends of the span, verify that the OC-N port is active and in service:

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).

Cisco ONS 15327 Troubleshooting Guide, R3.4

2-48

March 2004

 

 

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Cisco Systems ONS 15327 manual 49 EOC, Procedure Clear the EOC Alarm, Click the Provisioning Line tabs
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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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