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Figure A7: Diagrammatically Showing Typical Wall Installation with the addition of
16.9 Surge Arrestor Wiring
The Andrew Grounding Kit at the ODU is optional, providing a Surge Arrestor Unit is located
at the ODU and is reliably grounded. However, it may be a regulatory requirement to cross-
bond the screened CAT-5 at regular intervals up the mast. Refer to local regulatory
requirements for further details.
The Canopy 150/300 Mb BH E1/T1 cable requires Surge Arrestor ALPU-ORT Units mounted
at both ends of the cable. At the ODU, the Surge Arrestor Unit should be mounted within
0.5m of the ODU and must be grounded to the ODU. All upper tower grounds should be
within 0.3m of the ODU bracket and on the same metal. For mast installations, the Surge
Arrestor Unit should be mounted at the same height as the ODU.
The lower Surge Arrestor Unit should be mounted at the building entry point and must be
grounded.
The termination of the CAT-5 Cable into the Surge Arrestor Unit is illustrated in Table A2,
Table A3 and Figure A8. The screen from the cable must be terminated into the ground
terminal within the unit to ensure the continuity of the screen. Ground (Earth) Sleeving should
be used to cover the shield ground connection to prevent internal shorting within the unit.
Issue 1.1 April 2006
Spectra
Surge Arrestor to
ODU Ground
Connection
Grounding
Cable
Ground Stake
Typical Wall Installation
Optional Ethernet Fibre
connection to ODU
Surge
Arrestors
ALPU-ORT
Power/Ethernet
Connection
E1/T1 Connection
Surge
Arrestors
Spectra PIDU fitted
inside building
E1/T1 Connection
Optional Fibre
Connection to
Network
E1/T1 cable
Copper Connection
to Network
Page 159
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