I know that before you use the fiber optic cable you should calculate the power budget and make sure that the total power should be below the Transceiver power budget margin to be sure that the system will work as it designed. If I'm using a 1G, it will run without any problem smoothly.
1) But my question is, let us say that we are using a 1G GBIC card, and after calculating the power budget for my system it shows that it is above the margin. what will happen ? will it works but with lower speed, or it will not work at all since its beyond the margin and the receiver can't receive it ?
ex: using a 1000BASE-LX cisco card that have a 10.5 dbm power margin and my system is having a 12dB. will it work but with lower speed than 1G ? or it will not work at all ?
2)If it will work with lower speed,then can I use a card and I exceed the budget margin and use it with lower speed, rather than buying a new card ? or it will damage the system ? Because I may don't need that high speed.
Sorry for my lot of question. but I need to understand that power budget better.