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5.7
Distance
The PTP 500 Series Bridge will operate at ranges from 100 m (330 ft) to 250 km (155 miles).
Operation of the system will depend on obstacles in the path between the units. Operation at
40 km (25 miles) or above will require a near line-of-sight path. Operation at 100m (330 ft)
could be achieved with one unit totally obscured from the other unit, but with the penalty of
transmitting at higher power in a non-optimal direction, thereby increasing interference in the
band. This subject is covered in more detail in Section 6.1.3 "Path Loss Considerations".
5.8
Networking Information
The PTP 500 Series Bridge operates as a transparent Ethernet bridge. Although each unit
requires an IP address, this IP address is for management purposes only, and it plays no part
in the forwarding of bridged Ethernet frames. IP addresses are assigned during initial
configuration as described in 7.2 "Installation Procedure".
5.9
Lightning Protection and Regulations
The amount of lightning protection is dependent on regulatory requirements and the end user
requirements. The standard ODU for the PTP 500 Series Bridge is fitted with surge limiting
circuits and other features to minimize the risk of damage due to nearby lightning strikes.
These standard features may require some additional equipment to be configured as part of
the system installation to be fully effective.
CAUTION: Motorola recommends the use of screened cable and Lightning Protection units to
protect connected equipment from nearby strikes.
NOTE: The PTP 500 Series Bridge is not designed to survive direct lightning strikes. For this
reason the unit should not be installed as the highest point in a localized area, unless specific
precautions are taken. See Section 11 "Lightning Protection".
5.10 Electrical Requirements
The PTP 500 Series Bridge requires one mains supply outlet at each end of the link to plug in
the PIDU Plus units. See Section 3.3.2 "PIDU Plus – PTP 300/500/600 Series Bridge".
5 General Considerations
48
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