Chapter 1 General Troubleshooting

Fiber and Cabling

c.Determine the power level of fiber with the fiber-optic power meter.

d.Verify that the power meter is set to the appropriate wavelength for the optical card being tested (either 1310 nm or 1550 nm depending on the specific card).

e.Verify that the power level falls within the range specified for the card; see the “1.8.2.3 Optical Card Transmit and Receive Levels” section on page 1-77.

Step 4 If the power level falls below the specified range:

a.Clean or replace the fiber patch cords. Clean the fiber according to site practice or, if none exists, follow the procedure in the Cisco ONS 15327 Procedure Guide. If possible, do this for the OC-N card you are working on and the far-end card.

b.Clean the optical connectors on the card. Clean the connectors according to site practice or, if none exists, follow the procedure in the Cisco ONS 15327 Procedure Guide. If possible, do this for the card you are working on and the far-end card.

c.Ensure that the far-end transmitting card is not an ONS intermediate-range (IR) card when an ONS long-range (LR) card is appropriate.

IR cards transmit a lower output power than LR cards.

d.Replace the far-end transmitting card to eliminate the possibility of a degrading transmitter on this card.

e.If the power level still falls below the specified range with the replacement fibers and replacement card, check for one of these three factors that attenuate the power level and affect link loss (LL):

•Excessive fiber distance—Single-mode fiber attenuates at approximately 0.5 dB/km.

•Excessive number or fiber connectors—Connectors take approximately 0.5 dB each.

•Excessive number of fiber splices—Splices take approximately 0.5 dB each.

Note These are typical attenuation values. Refer to the specific product documentation for the actual values or use an optical time domain reflectometer (OTDR) to establish precise link loss and budget requirements.

Step 5 If no power level shows on the fiber, the fiber is bad or the transmitter on the optical card failed:

a.Check that the Tx and Rx fibers are not reversed. LOS and EOC alarms normally accompany reversed Tx and Rx fibers. Switching reversed Tx and Rx fibers clears the alarms and restores the signal.

b.Clean or replace the fiber patch cords. Clean the fiber according to site practice or, if none exists, follow the procedure in the Cisco ONS 15327 Procedure Guide. If possible, do this for the card you are working on and the far-end card.

c.Retest the fiber power level.

d.If the replacement fiber still shows no power, replace the optical card.

Step 6 If the power level on the fiber is above the range specified for the card, ensure that an ONS long-range (LR) card is not being used when an ONS intermediate-range (IR) card is appropriate.

LR cards transmit a higher output power than IR cards. When used with short runs of fiber, an LR transmitter is too powerful for the receiver on the receiving card.

Receiver overloads occur when maximum receiver power is exceeded.

Cisco ONS 15327 Troubleshooting Guide, R3.4

 

April 2003

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Cisco Systems ONS 15327 manual General Troubleshooting Fiber and Cabling
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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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