When I put in the transceiver module, and connect it it doesn't show any 'light' and it won't make the connection. distance is 200m+ on a MM 62,5 fiber which works perfectly with the existing 3COM switches & SFP's.
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Yes, the GLC-SX-MMD and GLC-SX-MM are compatible with each other, and the difference between the two is that the GLC-SX-MMD transceiver has additional support for Digital Optical Monitoring (DOM) capability. For more tech support, you can consult with our CCIE expert - Bill, and his e-mail address is as below:
GLC SX MMD Price Cisco SFP Modules GLC SX MMD 3Anetwork com
Can you tell more details, there's various possibilities to cause the switch not work...
You can check your switch from these way:
1 check your cenect cord
2 check the power supply
3 check your network environment
If you also have a standard copper cable (or a second fibre cable) connecting the two switches (for resilience perhaps?), this issue is probably being caused by something called Spanning Tree. This is implemented on switches as a 'loop avoidance' system, and can look like you have described with one end 'ip' and the other end no lights.
On the Cisco switch, get to a telnet/ssh/console session, log in and enter show spanning-tree and press enter.
have a look to see if the fibre interface has a status (sts column) of BLK. If it has, then this is called 'blocking' and will remain like that until you remove the second link to the other switch.