what is speed and duplex configuration on NSP fiber ports and LAN switches on both sides?
When you attempt to enable the ports do you get a brief green light on either of the ports or displayed on the port configuration screen on the NSM?
If you get a momentary green light on the 1A and nothing on the 1B then the chances are the problem lies between the 1B and the downstream device.
Failing that: pop both SFP out and reseat them and if possible try different SFP (one at a time just so you can see if you have a faulty one)
Check that the fibres you are using are of the same grade (mm, sm)
Check that the devices up steam and downstream of the sensor are using the same power fibre light source. i.e. laser to laser, led to led
Hope that helps
We are checking and the cables and in one gbic is 50 um and in the other is 65 um, i think thats the problem