Enterasys Networks RBT-1602 manual Determining the Antenna Locations, Distances with Cables

Determining the Antenna Locations

Determining the Antenna Locations

The following factors determine the locations where you can place the antennas relative to one another and the distances between them:

•Type of antennas. The RoamAbout antennas are described in Antenna Models on page 1‐9.

•Length of cable connecting the antenna to the AP.

•Data rate required.

•In a LAN‐to‐LAN network, the distance between the buildings.

•Obstructions in the signal path.

•In a wireless infrastructure network, the area around the antenna where clients need to communicate with the AP.

Typically, the RoamAbout directional and omni‐directional antennas are installed on rooftops. The directional antenna can also be installed on the side of a building. The following sections describe the factors that affect the range of the antennas.

Distances with Cables

Table 1‐2 lists the distances for the RBT‐4102, RBT‐4102‐EU, and the RBT‐4102 ‐BG. The distances include the cables at both ends. For every 6 dBi of cable loss, divide the distance by two. For every 10 dBi of cable loss, divide the distance by three.

.	Notes:
	• Be sure to calculate the cable loss at both ends, and include the pigtails.

• The distance miles listed are approximate.

•If the RBT-4102-EU uses one 8 dBi (RBTES-BG-M08M) to one or more 14 dBi sector antenna(s), you will get approximately half the distances shown in Table 1-2using the 2.4 GHz band.

Table 1-2 Outdoor Distance Matrix Between Antennas (RBT-4102 LAN to LAN/MultiPoint)

			Signaling
GHz	Antenna	Cables used	Rate	Throughput	Miles

5.7- 5.8 RBT-AH-P23M (23 dBi to 23 dBi)

For use in North America only.

Pigtail and the	54 Mbit/s	21 Mbit/s	2
LMR-600-C25F at	36 Mbit/s	17 Mbit/s	4
each end
	24 Mbit/s	13 Mbit/s	6
	6 Mbit/s	4.5 Mbit/s	8
Pigtail and the	54 Mbit/s	21 Mbit/s	1.2
LMR-600-C50F at	36 Mbit/s	17 Mbit/s	2.4
each end
	24 Mbit/s	13 Mbit/s	3.5
	6 Mbit/s	4.5 Mbit/s	5
Pigtail and the	54 Mbit/s	21 Mbit/s	0.8
LMR-400-C50 at	36 Mbit/s	17 Mbit/s	1.6
each end
	24 Mbit/s	13 Mbit/s	2.3
	6 Mbit/s	4.5 Mbit/s	3.3

RoamAbout Antenna Site Preparation and Installation Guide 1-3