Cisco Cisco HGA9N HighGain Omni-Directional Antenna for N-Type Connectors 관리 매뉴얼

Cisco HGA9N Administration Guide

9

 

Wireless coverage depends on several factors, including power and transmission. 
You can calculate exact coverage distance by gathering the specifications of the 
access point and the Omni-Directional Antenna and using the equation below. 

This equation is not required, but it may be beneficial in optimizing use of your 
Omni-Directional Antenna and access point.

In this formula, everything is in dBm or dB. 

S

r

 is the received power. Here we plug in the receiver sensitivity to calculate the 

maximum distance. For example, -82dBm for 11Mbps.

S

t

 is the transmitted power. For example, 18dBm for 11Mbps.

G

t

 is the transmitter antenna gain and 

G

r

 is the receiver antenna gain (9dBi for this 

Omni-Directional Antenna). 

λ

 is the wavelength of the signal. The product of 

λ

 and frequency equals to speed 

of light (c). 

d

 is the distance. 

LinkBudget

 is the lump sum of additional loss (compared to free space) in the path.