PTP 670 QUICK START GUIDE
PAGE 12
PSU
Always use the AC Power Injector or AC+DC Enhanced Power Injector to power the ODU. Failure to use a
Cambium supplied PSU could result in equipment damage and will invalidate the safety certification and may
cause a safety hazard.
Grounding and protective earth
The Outdoor Unit (ODU) must be properly grounded to protect against lightning. It is the user’s responsibility to
install the equipment in accordance with national regulations. In the USA follow the requirements of the National
Electrical code NFPA 70-2005 and 780-2004
Installation of Lightning Protection Systems
. In Canada, follow
Section 54 of the
Canadian Electrical Code
. These codes describe correct installation procedures for grounding
the outdoor unit, mast, lead in wire and discharge unit, size of grounding conductors and connection
requirements for grounding electrodes. Other regulations may apply in different countries and therefore it is
recommended that installation of the outdoor unit be contracted to a professional installer.
DC supply
To power the ODU from a DC supply, use the AC+DC enhanced power injector (PSU) (Cambium part number
C000065L002C). Ensure that the DC power supply meets the requirements specified in the
PTP 670 Series User
Guide.
Powering down before servicing
Before servicing PTP 670 equipment, always switch off the power supply and unplug it from the PSU.
Do not disconnect the RJ45 drop cable connectors from the ODU while the PSU is connected to the power
supply. Always remove the AC or DC input power from the PSU.
Primary disconnect device
The main power supply is the primary disconnect device. The AC-DC enhanced power injector is fused on the DC
input. Some installations will also require an additional circuit breaker or isolation switch to be fitted in the DC
supply.
External cables
Safety may be compromised if outdoor rated cables are not used for connections that will be exposed to the
outdoor environment. For outdoor copper Cat5e Ethernet interfaces, always use Cat5e cable that is gel-filled
and shielded with copper-plated steel. Alternative types of drop cable are not supported by Cambium Networks
for use with PTP 670.
Always use a qualified electrician to install AC cabling.
Drop cable tester
A drop cable tester must NEVER be used at the ODU end connected to the power supply from the PSU. It must
only be used at the bottom of the mast with a multimeter. This is because the PSU voltage exceeds the limit
allowed in some countries for safe handling in wet conditions and therefore may create a safety hazard.
RF exposure near the antenna
Strong radio frequency (RF) fields will be present close to the antenna when the transmitter is on. Always turn
off the power to the ODU before undertaking maintenance activities in front of the antenna.
Minimum separation distances
Ensure that personnel are not exposed to unsafe levels of RF energy. The units start to radiate RF energy as
soon as they are powered up. Never work in front of the antenna when the ODU is powered. Install the ODUs so
as to provide and maintain the minimum separation distances from all persons.
Grounding and lightning protection requirements
