IBM TotalStorage SAN256N Director 2045-N16, Installation And Maintenance Manual, Page: 139 / 157

Appendix A. Data collection and troubleshooting
119
Note: A smaller numerical value indicates a greater power level, e.g., a power level -
17.0 dBm is greater than a power level of -20.5 dBm.
If a correct reading cannot be obtained, disconnect the test cable and use another fiber
test cable and take a second measurement. If the measured power level is still not within
specification, call IBM Technical Support.
Figure 44. Transmitter output power level test setup
Measuring the receiver (Rx) input power at the TFIO port
1. Disconnect the fiber optic test cable from the TFIO port Tx connector.
2. Reconnect the original fiber optic cable to the TFIO port Tx connector.
3. Disconnect the fiber optic cable from the TFIO port Rx connector.
4. Connect the receiver fiber optic cable to the power meter
5. Connect fiber optic test cable to the TFIO port Rx connector and the power meter.
TFIO Blade
TFIO Port
TX RX
ST Connector
(Duplex LC)
Power Meter
Fiber Optic
Jumper Cable
TFIO Blade
LC to
ST Connector
Duplex LC
Power Meter
“B” Side
ST Cable