Operating Manual

Operator’s Manual M365-491
3-14 Chapter 3
March/2006 Installation
3-3.3 RF (Antenna) Output
WARNING
The CAP antenna radiates radio frequency
(RF) power. To avoid exceeding federal
communications commission (FCC) radio
frequency exposure limits, human proximity
to the antenna shall be no less than eight
inches (20 centimeters) while RF is enabled.
The CAP is designed to be used with two indoor antennas when configured as a CWLU (using CAP
operating software) or one outdoor antenna when configured as a TWLU (using WAB operating
software). The two indoor antennas connect to the two RF output connectors shown in
Figure 3-9.
Connector J2 is the RF output for radio 2 and connector J3 is the RF output for radio 1. The outdoor
antenna connects to RF output connector J3 shown in Figure 3-9. Table 3-3 provides the pin
assignments for the RF output connectors.
To comply with Federal Communications Commission (FCC) requirements, attenuation is required
between the CAP and the antenna for IEEE 802.11b and/or IEEE 802.11g operation at maximum
transmit power. This attenuation is typically accomplished by connecting a minimum of six feet of
RG-58 coaxial cable (or alternate coaxial cable with equivalent attenuation characteristics) between
the CAP and the antenna. If no extension cable is connected between the CAP and the antenna, the
applicable radio transmit power must be set to a maximum value of 15 dBm. Refer to the applicable
operating software operator’s manual for instructions for setting radio transmit power.
Table 3-3. RF Output Connectors J2 and J3 Pin Assignments
Connector Component* Signal
Center Conductor RF Signal
Shield RF Return
* Use TNC Plug for mating connector.
3-3.4 Discrete Inputs
Two ground/open type discrete inputs as defined by ARINC 763-2 are provided via I/O connector J1
to enable external control of CAP operation. An external controller or switch panel can be used to
power up the CAP and enable wireless operation. Connecting a ground to on/off control (pin 14)
causes the CAP to power up. When the ground is disconnected, the CAP will power down.
Connecting a ground to RF enable/disable (pin 15) will enable wireless operation. When the ground
is disconnected, wireless operation is disabled. The wired LAN remains operational when wireless
operation is disabled.