Chapter 3: System planning
Link planning
Page 3-23
Equipment Capability (dB)
Calculating Link Loss
The link loss is the total attenuation of the wireless signal between two point-to-multipoint units.
The link loss calculation is presented below:
Link Loss (dB) = Transmit power of the remote wireless unit (dBm)
−
Tx Cable loss
(dB)
−
Received power at the local unit (dBm) – Rx cable loss (dB) +
Antenna gain at the remote unit (dBi) + Antenna gain at the local unit
(dBi)
Calculating Rx Signal Level
The determinants in Rx signal level are illustrated in
Figure 45.
Figure 45 Determinants in Rx signal level
Rx signal level is calculated as follows:
Rx signal level dB = Tx power
−
Tx cable loss + Tx antenna gain
−
free space path loss + Rx antenna gain
−
Rx cable loss
Note
This Rx signal level calculation presumes that a clear line of sight is established
between the transmitter and receiver and that no objects encroach in the Fresnel zone.
Содержание PMP 450d Series
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