Cabletron Systems 42T User Manual

a.

Check that the device at the other end of the link has power.

b.

Verify that the fiber strands are properly “crossed-over” between 
the ports on the module and on the fiber optic device at the other 
end of the fiber optic link segment.

c.

Verify that the fiber connection meets the dB loss limit 
specifications outlined in Chapter 2.

d. Check that the port is enabled through MicroMMAC-T Local 

Management.

e.

If a link still can not be established, contact Cabletron Systems 
Technical Support.

1. Trace the ring path through the network to be sure that there are no 

breaks in the ring and that it is free from logical design errors.

a.

 Check that each cable connection is secure and logically correct.

b.

Verify the pinouts for each connection.

c.

Use a cable tester to check the cable conductors for continuity. 

2. Check that all devices operating on the same network are set to the 

same ring speed.

3. Ensure that the maximum number of stations is not exceeded.

4. Ensure that the maximum cable length to each station is not exceeded.

5. Ensure that the networking software is configured properly to match 

the installed network.

When these checks are successfully cleared, the MicroMMAC-T is ready 
for normal operation. If errors or other problems are encountered, see 
Chapter 5, Troubleshooting, for information about diagnosing operational 
problems.

If problems still occur, contact your Cabletron Technical Support 
representative.