User's Guide

PTP 250 User Guide Cabling and lightning protection
phn-2182_003v004 (Oct 2011)
UNDER DEVELOPMENT
1-13
Cabling and lightning protection
This section describes the cabling and lightning protection components of PTP 250
installations.
PTP and lightning protection
The PoE power supply meets the low level static discharge specifications identified in
Electromagnetic compatibility (EMC) compliance on
page 4-8 but does not provide
lightning or surge suppression.
The amount of lightning protection is dependent on regulatory and end user requirements.
The standard ODU is fitted with surge limiting circuits and other features to minimize the
risk of damage due to nearby lightning strikes. To be fully effective, these standard
features require some additional equipment to be configured as part of the system
installation.
The units are not designed to survive direct lightning strike. For this reason they
must not be installed in ‘Zone A’, as defined in Lightning protection zones on page
2-16. Mounting in Zone A may put equipment, structures and life at risk.
Outdoor connections
The term ‘drop cable’ refers to the cable that is used for all connections that terminate
outside the building, for example, connections between the ODU, LPU and PoE power
supply.
For outdoor connections, always use Cat5e cable that is gel-filled and shielded with
copper-plated steel. This is the only type of outdoor drop cable supported in this
application.