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Link Loss Budget Worksheet

Step One - Distance
Cable Distance 
(Distance as measured in the system.)
  
Loss per Km 
(This value should be obtained from the cable manufacturer.)
  dB/Km
Total Fiber Loss 
(Cable Distance x Loss per Km)
 dB
Step Two - Total Connector Loss
Connector Pair Loss 
(the maximum connector pair loss permitted for installation. This value should be determined by the system designer. ANSI/TIA/EIA-568-B.3 recommends a maximum value of 0.75 dB.)
 dB
Number of Connector Pairs 
(This does not include the connectors that plug into the end equipment.)
Total Connector Loss 
(Connector Pair Loss x Number of Connector Pairs)
 dB
Step Three - Total Splice Loss
Individual Splice Loss 
(The maximum splice loss permitted for installation. This value should be determined by the system designer. ANSI/TIA/EIA-568-B.3 recommends a maximum value of 0.3 dB for a fusion or mechanical splice.)
dB
Number of Splices 
(This includes fusion and mechanical splices.)
Total Splice Loss 
(Individual Splice Loss x Number of Splices)
 dB
Step Four - Total Other Components Loss
Optical Bypass Switch Loss 
(This value should be obtained from the switch manufacturer.)
 dB
Optical Splitter Loss 
(This value should be obtained from the splitter manufacturer.)
 dB
Other Optical Components Loss
(An example of other optical components are passive concentrators. Enter the value here for any optical components other than the switch and splitter. These values should be obtained from the the component manufacturer.)
 dB
Total Other Components Loss 
(Optical Bypass Switch Loss + Optical Splitter Loss + Other Optical Components Loss)
 dB
Step Five - Manufacturer's Electronics Specifications
Average Transmitter Output
(This value should be obtained from the transmitter manufacturer. If a specification for Average Transmitter Output is not available, use the specification for Minimum Output Power.)
 dBm
Minimum Receiver Sensitivity
(This value should be obtained from the receiver manufacturer.)
 dBm
System Gain 
(= Average Transmitter Output - Minimum Receiver Sensitivity)
 dB
Step Six - Total Power Penalties
Power Penalties
(This value should be obtained from the equipment manufacturer. If no value is provided, use 2.0 dB.)
 dB
Repair Margin
(A value of 0.6 dB (2 splices x 0.3 dB loss per splice) is typically used.)
 dB
Total Power Penalty 
(= Power Penalties + Repair Margin)
 dB
Step Seven - Link Loss Budget
System Gain 
(= Average Transmitter Output - Minimum Receiver Sensitivity)
 dB
Total Power Penalty
(= Power Penalties + Repair Margin)
 dB
Total Link Loss Budget 
(= System Gain - Power Penalties)
 dB
Step Eight - System Performance Margin
Total Link Loss Budget 
(= System Gain - Power Penalties)
 dB
Total Cable System Attenuation
(= Total Fiber Loss + Total Connector Loss + Total Splice Loss + Total Other Components Loss)
 dB
System Performance Margin 
(= Total Link Loss Budget - Total Cable System Attenuation)
 dB
A System Performance Margin value of "zero" or any "negative number" is not recommended by Corning Optical Communications. For a quick hands-on solution to an immediate problem, call 1.800.743.2673 and ask for a Duty Engineer.

 

Corning Optical Communications has made every effort to ensure that accurate calculations are produced by using this calculator. However, Corning Optical Communications assumes no liability for damages that may arise from using these calculations in telecommunications system design. This calculator should be used as a tool in conjunction with standard industry methodology for figuring a Link Loss Budget.