User's Manual

AXELL MBF -40 AMERICAS REPEATERS
PRODUCT DESCRIPTION AND USER’S MANUAL
36 Doc. No. 00071UM Rev. 3.4 © Axell Wireless Ltd
3.6 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 3-23: 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.
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