User Manual

AXELL MBF MULI-BAND FIBER REPEATER
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd 9
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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 2 ms. 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.
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