Axell BSF-3302 61-200001 Series Repeater
Product Description and U
ser’s Manual
© Axell Wireless Ltd
Doc. No. PN 3302 61-200001 Series-UM Rev. 1.0
27
BTS
AC Supply
Circuit
Breaker
OMU
Directional
Coupler
Optical Fiber
Equipotential
Grounding Bar
Primary
Protection
Device
Antenna
The top of the mast
must be higher than
the antenna and
grounded properly
The grounding path
must have reliable
continuity and be
dimensioned correctly
BSF
Repeater
RF to/from
DAS
BTS Area
Repeater Area
Fiber Optic Link
4.4 Ensure Good Electromagnetic Vulnerability (EMV) Protection
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 4-9: 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.
The primary protective device is part of the site installation and is not supplied by Axell Wireless.
Coaxial lightning protection is normally one of these three types: Gas capsule, High-pass and
Bandpass.
There also needs to be a protective device (circuit breaker) installed on the power supply cord (see
section 4.7).
