User's Manual

Table Of Contents
Wireless LAN Array
Installing the XS-3900 31
Power Planning
This section discusses the AC and DC power options.
AC Power
The AC power option requires a direct connection between the XS-3900 and a
dedicated AC power outlet. The power cord is provided with the unit.
Remote Distributed DC Power
To deliver DC power to the XS-3900, you must have the optional Xirrus Remote
DC Power System (XP-3100) and a Xirrus Array that supports DC power—see
Figure 4 on page 8 . The XP-3100 provides DC power to multiple XS-3900 units
from a single source, and requires only one AC power outlet.
Depending on the type of cable used, XS-3900 units can be located up to 600 feet
from the XP-3100. In addition, the XP-3100 can be plugged into a UPS to prevent
power failure to all XS-3900 units in the network.
When using CAT5 cable, DC power can be provided up to a distance of 300 feet.
Security Planning
This section offers some useful guidelines for defining your preferred encryption
and authentication method. For additional information, go to the Security section
of “Frequently Asked Questions” on page 186.
Wireless Encryption
Encryption ensures that no user can decipher another user’s data transmitted
over the airwaves. There are three encryption options available to you, including:
z WEP-40bit or WEP-128bit
Because WEP is vulnerable to cracks, we recommend that you only use
this for legacy devices that cannot support a stronger encryption type.
z Wi-Fi Protected Access
This is much more secure than WEP and uses TKIP for encryption.