Cisco 15310-MA Průvodce řešením problémů stáhnout pdf (Strana 264)

2-134

Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, Release 9.0

78-18394-01

Chapter 2 Alarm Troubleshooting

Alarm Procedures

2.7.211 SF

Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)

SONET Logical Objects: DS1, DS3

A Signal Fail condition occurs when the quality of the signal has exceeded the BER signal failure

threshold. Signal failure is defined by Telcordia as a “hard failure” condition. The SD and SF conditions

both monitor the incoming BER error rate and are similar conditions, but SF is triggered at a higher BER

than SD.

The BER threshold is user-provisionable and has a range for SF from 1E–5 to 1E–3.

Warning

Invisible laser radiation could 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 mm could pose an eye hazard.

Statement 1056

Warning

Use of controls, adjustments, or performing procedures other than those specified could result in

hazardous radiation exposure.

Statement 1057

Clear the SF (DS1, DS3) Condition

Step 1 Complete the “Clear the SD (DS1, DS3) Condition” procedure on page 2-131.

Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15310-CL

or ONS 15310-MA.

Step 2 If the condition 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).

2.7.212 SF-L

Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)

SONET Logical Objects: EC1, OCN

An SF Line condition applies to the line layer B2 overhead byte of the SONET signal. It can trigger a

protection switch. The SF-L 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.

The condition is superseded by higher-priority alarms such as 2.7.139 LOF (OCN) or 2.7.154 LOS

(OCN).

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