Cabletron Systems 36 Manual De Usuario

Chapter 3: Testing and Troubleshooting

5. Disconnect the jumpers from the barrel connector.

6. Using the jumper, attach the optical power meter to one end of one 

strand of the link segment.

7. Using the other jumper, attach the other end of the same strand to the 

optical source unit.

8. Note the reading on the optical power meter. This is your test level.

9. Subtract the reference level found in Step 4 from the test level to find 

your dB loss for the fiber optic link segment, i.e., 
dB loss = Test Level - Reference Level.

10. Verify that the reading on the receive unit falls within the range 

indicated by the Receive Sensitivity and Maximum Receive Input 
Power specifications listed in the Fiber Optic Interface section of 
Appendix A.

11. Repeat Steps 6 through 10 for the other strand in the link segment.

If the fiber optic link segment does not meet the specifications, it may be 
contaminated with dust, dirt, or other contaminants. Try cleaning the 
connection at each end of the cable with denatured alcohol, using a soft, 
clean, lint free cloth, then repeat the test.

If this does not work, contact Cabletron Systems technical support.

To verify the physical link between your devices, check the LNK LEDs 
on your FOMIM and receiving device for the applicable port. If the LEDs 
are lit, the proper connection has been made.

If the LEDs are not lit, perform the following procedure, using a 
Cabletron Systems FOT-F3 Fiber Optic Transceiver at the other end of the 
cable.

1. Check that power is being supplied to both the FOMIM in the MMAC 

chassis and the device at the other end of the link.

2. Reverse the fiber optic cable ends at either the applicable port on the 

module or at the device.

3. Check if the LEDs are lit.