Power Budget Calculation

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Power Budget Calculation
A link's power budget is the maximum amount of power it can transmit. When you calculate the power budget, you use a worst-case analysis to provide a margin of error, even though all the parts of an actual system do not operate at the worst-case levels. To calculate the worst-case estimate of power budget (P_B), you assume minimum transmitter power (P_T) and minimum receiver sensitivity (P_R).

Table 15 lists equations for calculating the power budget for SONET/SDH PIC interfaces. The values are measured in decibels (dB) and decibels referred to one milliwatt (dBm).

Table 15: Calculating Power Budget for SONET/SDH PIC Interfaces

PIC Interface

Power Budget Equation

Multimode

P_B = P_T- P_RP_B= -15 dBm - (-28 dBm) P_B = 13 dB

OC-12 single-mode

P_B = P_T- P_RP_B= -15 dBm - (-28 dBm) P_B = 13 dB

OC-48 single-mode

P_B = P_T- P_RP_B= -5 dBm - (-18 dBm) P_B = 13 dB

PIC Interface	Power Budget Equation
Multimode	`P`_B `= P`_T`- P`_R`P`_B`= -15 dBm - (-28 dBm) P`_B `= 13 dB`
OC-12 single-mode	`P`_B `= P`_T`- P`_R`P`_B`= -15 dBm - (-28 dBm) P`_B `= 13 dB`
OC-48 single-mode	`P`_B `= P`_T`- P`_R`P`_B`= -5 dBm - (-18 dBm) P`_B `= 13 dB`

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