A stand-by Ethernet bridge shall be provided for each bridge location. The
bridge shall utilize a hot stand-by protection switch. The bridge may be
manually swapped from primary to backup.
2.2.3
Hot Stand-by Protection Switch
The protection switch shall simultaneously switch all radio functioning
including Ethernet bridge RF, antenna, data, orderwire, diagnostics, and
auxiliary data ports to the stand-by radio whenever there is a hardware
failure indicated. The protection switch shall only require the use of one
antenna for both bridges. The switching time shall be less than 5 seconds.
There shall be status and alarm indicator lights.
2.2.4
Operating Conditions
The environmental operating conditions for the bridge shall be a minimum of
0 to 55 degrees C 32 to 131 degrees F and a maximum of 85% relative
humidity.
2.2.5
Security
The bridges must utilize a security protocol that has a minimum of 128-bit
encryption on all data being transferred from the point-to-point bridges.
2.2.6
Software
Bridges shall utilize integrated web-based network management software or a
direct telnet connection for configuration and diagnostic.
2.3
ANTENNA SYSTEM
**************************************************************************
NOTE: The designer must show the topography on the
drawings and select appropriate environmental
conditions.
**************************************************************************
Antenna system shall be selected to be consistent with the paragraph RADIO
FREQUENCY COMMUNICATION EQUIPMENT (RFCE) SYSTEM REQUIREMENTS. The antenna,
when possible, shall be placed on a tall structure or similar geographical
feature, such as a water tower, tall building, existing radio tower, or
mountain to maintain the needed line of site to each antenna. The antenna
system shall utilize vertical polarization antennas, communication links
between bridges and antennas, and matching networks as needed for the
proper coverage. The antenna system shall be either omni-directional or
shaped-coverage as determined by the Contractor from the topography. The
antenna system and cabling shall be furnished to provide adequate system
gain. The antennas shall be capable of withstanding the environmental
conditions of 201.2 km/hour 125 mph wind and 13 mm 1/2-inch radial ice
without failure. The antenna system shall be selected by the Contractor to
meet the requirements as determined from the topography. Lightning
protection shall comply with NFPA 780. Grounding Conductors Antenna
grounding conductors shall be minimum 32-strand, No. 17 AWG copper.
2.4
GROUND RODS
Ground rods shall be as specified in Section 16402 INTERIOR DISTRIBUTION
SYSTEM.
SECTION 16798A
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