Cabletron Systems 9033073 manual Which Antenna do You Need, Calculating Range & Clearance

Calculating Range & Clearance

Which Antenna do You Need

Which Antenna do You Need

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.

NOTE

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.

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.

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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-sightclearance

—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.

D-10 Outdoor Antenna Installation Guide