Cisco ONS 15454 Troubleshooting Manual page 413

Chapter 2 Alarm Troubleshooting
The SD 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 such as a faulty fiber
connection, a bend in the fiber that exceeds the permitted bend radius, or a bad fiber splice. SD can also
be caused by repeated XC10G card switches that in turn can cause switching on the lines or paths.
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
Some levels of BER errors (such as 1E–9 dBm) take a long period to raise or clear, about 9,000 seconds,
Note
or 150 minutes. If the SD threshold is provisioned at 1E–9 dBm rate, the SD alarm needs at least one
and a half hours to raise and then another period at least as long to clear.
The recommended test set for use on all SONET ONS electrical cards is the Omniber 718. For specific
Note
procedures to use the test set equipment, consult the manufacturer.
Clear the SD (E1) Condition
Complete the
Step 1
Always use the supplied electrostatic discharge wristband when working with a powered ONS 15454.
Caution
Plug the wristband cable into the ESD jack located on the lower-right edge of the shelf assembly.
Ensure that the fiber connector for the card is completely plugged in. For more information about fiber
Step 2
connections and card insertion, refer to the "Install Cards and Fiber-Optic Cable" chapter in the
Cisco ONS 15454 Procedure Guide.
Step 3 If the BER threshold is correct and at the expected level, use an optical test set to measure the power
level of the line to ensure it is within guidelines. For specific procedures to use the test set equipment,
consult the manufacturer.
If the optical power level is good, verify that optical receive levels are within the acceptable range.
Step 4
If receive levels are good, clean the fibers at both ends according to site practice. If no site practice exists,
Step 5
complete the procedure in the "Maintain the Node" chapter of the Cisco ONS 15454 Procedure Guide.
If the condition does not clear, verify that single-mode fiber is used.
Step 6
If the fiber is of the correct type, verify that a single-mode laser is used at the far-end node.
Step 7
Clean the fiber connectors at both ends for a signal degrade according to site practice.
Step 8
If the problem does not clear, the transmitter at the other end of the optical line could be failing and
Step 9
require replacement. Refer to the
on page
November 2009
"Clear Other Electrical Card or Ethernet Card Loopbacks" procedure on page
"2.9.4 Physical Card Reseating, Resetting, and Replacement" section
2-272.
Cisco ONS 15454 Troubleshooting Guide, R8.5
2.7.357 SD (E1)
2-277.
2-219