Electrical installation and wiring
5-34 Chapter 5: Installation 98-127093-H
5.3.7 Wiring WLAN antenna interface
Before wiring the WLAN antenna interface make sure that your system has the Built-in
Wireless Option TT-5040A-003.
With software 4.00 and SB-Safety voice the WLAN access point must be
disabled in the configuration software.
Overview
The following drawing shows the wiring of the SBU WLAN antenna interfaces.
Figure 5-21: Wiring WLAN antenna interfaces #1 and #2
WLAN low pass filter
The WLAN module in the SBU can in theory transmit in the 5 GHz (802.11a) frequency
range. This is inhibited permanently by the software in the SBU. If the aircraft cannot be
tested to be immune to 5 GHz signals, you can optionally insert a 2.4 GHz low pass filter
into the WLAN Coax to safeguard the aircraft against transmission in the 5 GHz frequency
range.
WLAN pins
The following list shows the pins used for the WLAN antenna interface on the SBU.
Important
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:
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SBU pin Name/description
TPA2 WLAN antenna #1 (coax)
TPA4 WLAN antenna #2 (coax)
TP5 WLAN Enable, Discrete Input (active low)
Table 5-18: SBU pins for WLAN antenna #1 and #2
SB-Lite.book Page 34 Tuesday, September 5, 2017 1:38 PM
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