Cambium PTP 450 series, Руководство пользователя

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Site planning PTP 450 User Guide
ptp-450 (July 2014)
2-35
Site planning
This section describes factors to be taken into account when choosing sites for the BHM or BHS, power supplies,
CMM4 (if applicable) and GPS antenna (if applicable).
BHM or BHS site selection
When selecting a site for the BHM or BHS, consider the following factors:

Height and location to ensure that people are kept away from the antenna; see Calculated distances and power
compliance margins on page 4-122 .

Height and location to achieve the best radio path.

Ability to meet the requirements specified in Grounding and lightning protection on page 2-71 .

Aesthetics and planning permission issues.

Cable lengths; see Maximum cable lengths on page 2-35 .

The effect of strong winds on the installation; see Wind loading on page 2-36 .
Power supply site selection
When selecting a site for the BHM or BHS power supply, consider the following factors:

Indoor location with no possibility of condensation.

Availability of a mains electricity supply.

Accessibility for viewing status indicator LED and connecting Ethernet cables.

Cable lengths; see Maximum cable lengths on page 2-35 .
Maximum cable lengths
When installing PTP 450 Series BHMs or BHSs, the maximum permitted length of the shielded copper Ethernet
interface cable is 330 feet (100m) from BHM/BHS to their associated power supplies or uGPS.
When receiving synchronization signalling from a uGPS module, see table below for maximum synchronization
cable lengths.
Table 16 Sync cable length specification
Configuration Maximum Cable
Length (feet) Maximum Cable
Length (meters)
UGPS powered via external power
source
330 100