Black Box LBH240A Manual De Usuario

Black Box

®

 Heavy Duty Edge Switches       Installation and User Guide(07/05) 

 

53

               for Heavy-Duty LBHXXX, Fiber Media 

Receiver Sensitivity and Transmitter Power are the parameters necessary to 

compute the power budget. To calculate the power budget of different fiber media 
installations using Black Box products, the following equations should be used: 
OPB (Optical Power Budget) = P

T

(min) - P

R

(min) 

          

 where P

T 

 = Transmitter Output Power, and P

R

 =  Receiver Sensitivity 

 
     Worst case OPB = OPB - 1dB(for LED aging) - 1dB(for insertion loss) 
     Worst case distance = {Worst case OPB, in dB} / [Cable Loss, in dB/Km] 
where the “Cable Loss” for 62.5/125 and 50/125

µm

 (m.m.) is 2.8 dB/km,   

 

and the “Cable Loss” for 100/140 (Multi-mode) is 3.3 dB/km, 

 

and the “Cable Loss” for 9/125 (Single-mode) is 0.5 dB/km 

 

and the “Cable Loss” for 9/125 (Single-mode) is 0.25 dB/km (SSCX) 

The following data has been collected from component manufacturer’s (Agilent’s, JDS-
Uniphase, stratus, Lucents’) web sites and catalogs to provide guidance to network 
integrators and installers-