2.1.1.1
Multi Mode Fiber Media
Provide FO media with outer sheath jacket,[ strength member,] ripcords,
water blocking material,[ optional steel shield,] core tube, and core
fibers as installed in a permanent underground pathway system as shown on
the construction drawings. FO media shall have an all glass, graded index
material with a nominal core diameter of [62.5][____] microns. Provide a
cladding material for the fiber which is compatible with the core. Media
transmission window shall be centered at 850 and 1300 nanometer
wavelengths, attenuation at 1300 nanometers shall be less than [2.0][___]
dB per kilometer. Minimum bandwidth shall be 500 mHz-Km.
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NOTE: The designer shall specify the number of
fiber strands. The minimum number of fiber to a
facility or building shall be 12 plus 25 percent
spare capacity. Designer shall specify loose tube
or tight tube design. In general gelatin filled
media should be used unless tight tube is required
to interface with customer terminal equipment. The
loose tube construction is more appropriate where
media is subject to numerous bends along the cable
route. This includes aerial and long distance runs
(over one Km). Tight tube design may be used for
exterior direct burial in ducts below the frost
line. For Navy projects the preferred underground
installation is within a pathway system compliant
with EIA/TIA-569. Direct burial installations shall
comply with EIA/TIA-590. Media for Defense
Information System Agency (DISA) equipment
connection shall comply with Mil-Std-188-176.
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2.1.1.2
Single Mode Fiber Media.
Provide FO single mode media with outer sheath jacket,[ strength member,]
ripcords, water blocking material,[ optional steel shield,] core tube, and
core fibers as installed in a permanent underground pathway system as shown
on the construction drawings. Media shall have all glass, dual window,
graded index material with a core diameter of [____][8.7] microns. Fiber
shall be coated with a cladding material which is concentric with the core.
Fiber cladding diameter shall be nominal 125 microns. Media shall have a
transmission window centered at 1300 and 1550 nanometer wavelengths,
attenuation at 1550 nanometers shall be less than 0.5 dB per kilometer. FO
media shall comply with EIA TIA/EIA-472DAAA,and EIA TIA-758.
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NOTE: Designer shall specify splice materials and
enclosures for fiber optic splices. The number of
fiber splices must be minimized to preserve the
transmission system signal. RUS 7CFR part 1753.f401
provides information on fiber optic splices.
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2.2
FIBER OPTIC SPLICES
Provide FO splices and splicing materials for [fusion][ or ][mechanical]
SECTION 16713N
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