Fiber connections are, in some cases, more sensitive than ethernet to negotiation because of the combination of many different Switch, SFP, and Fiber vendors. When you have trouble getting a Fiber connection between an ADTRAN unit and a non-ADTRAN unit to come up, try the following steps.
1. Make sure that the receive end and the transmit ends are in the proper sides of the SFP.
2. Try hard-setting both sides of the connection to the speed you desire the link to come up at.
3. If this is not successful, try hard-setting the speed with this command at the end:
This is a common requirement between ADTRAN switches and Cisco, Nortel, and Dell PowerConnect.