Siemens SCALANCE M874-2 Operating Instructions Manual page 40

Connecting up
3.6 Antennas
Danger due to lightning strikes
Installing this lightning protector between an antenna and a SCALANCE M-800 is not
adequate protection against a lightning strike. The LP798-1N lightening protector only
works within the framework of a comprehensive lightning protection concept. If you have
questions, ask a qualified specialist company.
Note
The requirements of EN61000-4-5, "Surge Immunity Test" on power supply lines with 24
VDC are met only when a Blitzductor is used:
24 VDC: BVT AVD 24 type no. 918 422
Vendor: DEHN+SÖHNE GmbH+Co.KG, Hans Dehn Str. 1, Postfach 1640, D -
92306 Neumarkt, Germany
Frequency bands in Europe, China, the USA and other regions
Depending on the frequency bands used by your mobile wireless provider, antennas must be
tuned to the following frequencies:
● In Europe, America, Africa, Asia and Australia:
– GSM 900 MHz
– DCS 1800 MHz
– UMTS 2100 MHz
● In the USA:
Check with your mobile wireless provider for the suitable frequencies.
Signal quality
During installation make sure that there is a good signal strength of > -73 dBm.
If the "Q" LED is lit permanently, the signal quality is good. For more detailed information,
refer to the section "LED display (Page 14)".
Avoid large metal objects in the immediate vicinity.
40
WARNING
– GSM 850 MHz
– PCS 1900 MHz (also for UMTS)
Operating Instructions, 07/2014, C79000-G89760-C331-03
SCALANCE M874, M876