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Connecting up
6.9 Connecting external antennas
The following figure shows the interfaces of a SCALANCE W786-2 with the housing cover
removed:
Figure 6-8
For each WLAN port, there are three R-SMA sockets on a SCALANCE W786 to connect
external antennas. The figure above shows how the R-SMA sockets are assigned to the
WLAN ports. On device variants with only one WLAN interface (W786-1), there is only one
row of sockets labeled "R1".
Perform the following steps to connect a cable for an external antenna to a SCALANCE
W786:
1. Insert the connector on the antenna cable into the R-SMA socket and tighten the sleeve
nut on the socket (key size SW8), tightening torque 0.6 Nm. First connect the cable for
the "R2" interface if you want to use both interfaces. Once the cable for interface "R1" is
connected, it is difficult to reach socket "R2".
2. Screw a terminating resistor to the unused socket if you use only one antenna on a port.
3. Secure the antenna cable(s) with a strain relief clamp. For more detailed information on
this topic, refer to the section "Connecting the cables".
Note
Terminating resistor
Each WLAN interface has three antenna connectors. Connectors that are not used must
have a terminating resistor fitted.
The antennas R1A1 and R2A1 must be always be connected as soon as the associated
WLAN Interface is turned on. if no antenna is connected, the relevant interface must also
be disabled for RX and TX. Otherwise, there may be transmission disruptions.
You will find information on the configuration of the antennas in the following documents:
• SCALANCE W786
• SCALANCE W786C
54
R1: Interface for the first wireless card
R2: Interface for the second wireless card. On devices with only one IWLAN interface
(W786-1), this interface does not exist.
SCALANCE W700 configuration manual, section "Configuring antennas"
SCALANCE WLC711 User Guide, section "Configuring wireless AP radio properties"
Operating Instructions, 11/2014, A5E03678337-07
SCALANCE W786-x
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