On 01/01/2012, at 3:52 AM, Robert Hass wrote: > Tx Power '-4.9' better than '-6.9' (i.e. signal is stronger if TX > Power is '-4.9' comparing to '-6.9') This brilliant NANOG talk will help explain power loss over fibre, amongst other optical topics. http://www.nanog.org/meetings/nanog48/presentations/Sunday/RAS_opticalnet_N48.pdf