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Cabling and lightning protection
PTP 450 Configuration and User
pmp-0815 (August 2015)
1-11
Cabling and lightning protection
This section describes the cabling and lightning protection components of a PTP 450
installation.
PTP and lightning protection
Due to the full metallic connection to the tower or support structure, it is strongly
recommended to install a 600SS surge suppressor at the Ethernet cable building ingress
and proper grounding to Backhaul Radio as well as antenna (if installed). This suppresses
over-voltages and over-currents as caused by near-miss lightning. The Radio provides a
grounding lug for grounding to the tower or support structure.
The PTP 450 Series is not designed to survive direct lightning strikes. For this reason the
unit must not be installed as the highest point in a localized area.
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 BHM/BHS, surge suppressors
(if installed), uGPS receivers (if installed) and the power supply injector.
The following practices are essential to the reliability and longevity of cabled connections:
Use only shielded cables and connectors to resist interference and corrosion.
For vertical runs, provide cable support and strain relief.
Include a 2 ft (0.6 m) service loop on each end of the cable to allow for thermal
expansion and contraction and to facilitate terminating the cable again when needed.
Include a drip loop to shed water so that most of the water does not reach the
connector at the device.
Properly crimp all connectors.
Use dielectric grease on all connectors to resist corrosion.
Use amalgamating tape on all N-type connectors.