Cabletron Systems 9033073 用户手册

Calculating Range & Clearance
Which Antenna do You Need

D-10

Outdoor Antenna Installation Guide

4

If you have not yet purchased a RoamAbout Outdoor Kit, you can 
read the tables in this appendix in 

reverse order to determine the 

type of antenna you will need.

1.

Determine the distance between the two sites that you wish to 
connect via a wireless link.

2.

Determine the line-of-sight clearance that you can achieve for 
the signal path between the two sites.

3.

Look in Table D-4 on page D-9 and select a column that 
matches the value you identified in step 2.

4.

In the Line-of-Sight column in Table D-4, look for a distance 
value equal to, or greater than the required distance to connect 
the two sites.

If the line-of-sight clearance column you selected does not 
include such a value, you may need to:

— Investigate whether another location for the antennas 

might provide a better line-of-sight clearance

— Investigate the possibility of increasing antenna mast 

height

If the Line-of-Sight clearance column does include such a 
value, read the Dynamic Range Budget value from the first 
column in the same row.

5.

Once you have determined the 

minimum Dynamic Range 

Budget, use Table D-1 or Table D-2 to select which 
combination of products provide the Dynamic Range you 
need.

Preferably you should look in Table D-3 and in Table D-4 for 
a Dynamic Range value printed without an asterisk, which 
represents the values for a connection that supports the full 
2 Mbit/s link speed.