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Table 1-2 Antennas for Wireless Network Configurations (continued)
Network Configuration
LAN-to-LAN Point-to-Multipoint
Wireless Infrastructure
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 Enterasys Wireless antennas are described in
•
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.
Directional and omni-directional antennas are often 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 these antennas.
Outdoor Distances with Cables
Table 1-3
lists the outdoor distances for AP2620.
AP3660.
•
All calculations account for outdoor RF links between two APs configured with the same
antenna and cabling on both ends.
•
The transmit power used for each antenna is the minimum allowed power for that antenna in
the frequency band (country is US).
•
The distance between the APs is calculated based on the free space Line of Sight and include
the Fade margin. A Fade margin of 10 dB is used to account for different environmental
conditions.
•
The throughput for the AP2620 is estimated as theoretical throughput with unidirectional
traffic, no retries, and a 15% packet error rate (PER).
Description
In a point-to-multipoint network, up to
nine WDS APs provide wireless links
to connect up to nine LANs. One AP
is designated as the root (multipoint)
AP connected to a wired
infrastructure. The other APs are
called child APs. Child APs establish
a backhaul connection with the root
AP and, at the same time, provide
LAN switching.
This is an inside/outside wireless
network where one or more WDS APs
are used to establish a wireless
backhaul and connect clients or LAN
segments to the wired LAN.
on page 1-4 lists the outdoor distances for AP3620 and AP3640.
Table 1-6
on page 1-9 lists the outdoor distances for AP3765e and AP3767e.
Enterasys Wireless External Antenna Site Preparation and Installation Guide 1-3
Table 1-5
on page 1-6 lists the outdoor distances for
Determining the Antenna Locations
Antenna Type
Omni-Directional antenna -
to which the root AP connects.
Directional antennas -
to which the child APs connect.
An Omni-Directional
or a sectored antenna.
Chapter
3.
Table 1-4
on page 1-5
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