Cambium Networks PMP 450 Series, Руководство по установке

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Chapter 3: System planning 139
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Cable lengths; see Ethernet standards and cable lengths.
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The effect of strong winds on the installation; see ODU wind loading.
Pow er sup p ly sit e select ion
When selecting a site for the ODU power supply, consider the following factors:
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Indoor location with no possibility of condensation, flooding or high humidity.
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Availability of a mains electricity supply.
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Located in an environment where it is not likely to exceed its operational temperature rating,
allowing for natural convection cooling.
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Accessibility for viewing status indicator LED and connecting Ethernet cables.
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Cable lengths; see Ethernet standards and cable lengths.
Maxim um cab le leng t hs
When installing PMP/PTP 450i Series ODU, the maximum permitted length of the shielded copper Ethernet
interface cable is 330 feet (100m) from AP/BHM/SM/BHS to their associated power supplies or CMM4.
When installing PMP 450m Series ODU, the maximum permitted length of the shielded copper Ethernet
interface cable is 330 feet (100m) from ODU to the network interface equipment.
The 3 GHz PMP 450M ODU can use a 1.0 mm 984.25 feet (300m) power cable.
Gr ound ing and lig ht ning p r ot ect ion
Warning
Electro-magnetic discharge (lightning) damage is not covered under warranty.
The recommendations in this guide, when followed correctly, give the user the
best protection from the harmful effects of EMD. However, 100% protection is
neither implied nor possible.
Structures, equipment and people must be protected against power surges (typically caused by lightning)
by conducting the surge current to ground via a separate preferential solid path. The actual degree of
protection required depends on local conditions and applicable local regulations. To adequately protect a
PMP/PTP 450 Platform installation, both ground bonding and transient voltage surge suppression are
required.
Full details of lightning protection methods and requirements can be found in the international standards
IEC 61024-1 and IEC 61312-1, the U.S. National Electric Code ANSI/NFPA No. 70-1984 or section 54 of the
Canadian Electric Code.
Warning
Never mount equipment in Zone A. Mounting in Zone A may put equipment,
structures and life at risk.
Light ning prot ect ion zones
Use the rolling sphere method (Rolling sphere method to determine the lightning protection zones) to
determine where it is safe to mount equipment. An imaginary sphere, typically 50 meters in radius, is rolled