A
XELL
BSF-4004
BSF0038
S
ERIES
R
EPEATER
PRODUCT DESCRIPTION AND USER’S MANUAL
3.4 Ensure Good EMV Protection
CAUTION!
If insufficient Electromagnetic Protection is provided, or if EMV measures are not
taken, warranties issued by Axell Wireless are not valid.
Connect the lightning protection
The lightning hazard to electric and electronic equipment consists in the interferences of direct
lightning current infections and high surge voltages induced by the electromagnetic field of nearby
lightning channels or down conductors. Amplitudes from cloud-to-earth lightning amounts to several
10kA and may last longer than 2ms. The damage caused depends on the energy involved and on the
sensitivity of the electronics systems.
Ensure that lightning protection measures are taken to create a reliable repeater site. Protect all
coaxial cables and power cables from the transients caused by lightning. Fit all cables with suitable
lightning protection devices.
Figure
3-13: Example of EMV protection for a repeater system
For detailed information please refer to IEC 61024-1 and 61312-1 for international standards for
protection of information systems against LEMP (Lightning Electromagnetic Pulse), including radio
transmitters. They define proper planning, installation and inspection of effective lightning protection
systems.
The Axell Wireless repeaters comply with the EN standard ETS 301 498-8 which stipulates demands
on lightning/surge protection for typical infrastructure telecom equipment installations.
Several lightning protection devices should be used in series with declining threshold voltages to help
attenuate the pulse component which makes it through the first layer of protection.
Repeater
Fiber
BTS
-30dB
Coupler
OMU
Antenna
Primary
Protective
Device
Equipotential
Grounding Bar
230VAC/
-48VDC
Protective
Device
The top of
the mast
must be
higher than
the antennas
and be
grounded
properly
The
grounding
path must
have reliable
continuity
and be
dimensioned
correctly
BTS area
Repeater area
8
Doc. No. PN 4004 BSF0038 Series-UM Rev. 1.0
© Axell Wireless Ltd
