with NFPA 70 for optical fiber nonconductive riser (OFNR) requirements
for riser cables and vertical shaft installations. Optical fibers
shall be covered in near contact with an extrusion tube and shall have
an intermediate soft buffer to allow for the thermal expansions and
minor pressures. Manufacturers' recommended values for tensile
strength, impact resistance, and crush resistance shall not be
exceeded. Interior cables' insulation and jacketing material shall not
contain any poly vinyl chloride (PVC) compounds.
2.16.4
Pigtail Cables
Cable used for connections to equipment shall be flexible fiber pigtail
cables having the same physical and operational characteristics as the
parent cable. The cable jacket shall be FCP, which complies with NFPA 70
for OFNP applications. Maximum dB loss for pigtail cable shall be 3.5
dB/km at 850 nanometers, and 1.0 dB/km at 1300 nanometers, and [_____]
dB/Km at 1550 nanometers.
2.17
FO CONNECTORS
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NOTE: Available FO connector types include, but are
not limited to, FC, SC, Duplex SE (568SC), ST,
Duplex ST, LC, Duplex LC, ESCON, FDDI, and MT-RJ.
Equipment manufacturers may offer both a
manufacturer's standard termination connector type
and also an optional termination connector type or
types as available on a specific equipment
component, whereas some equipment may only be
available with one termination connector type (as an
example, one manufacturer offers a choice of either
ST, SC, or FC connectors on a specific FO
transceiver).
For equipment additions to existing installation,
the installed base of legacy systems may suggest use
of a certain type of connector be continued and to
be used for new equipment. Alternatively, use of
hybrid adapters or hybrid cables, will allow the use
of cables with different connector types on opposite
cable ends to permit the cable connectors to be
compatible with the equipment termination
connectors. Connectors with a pull-proof feature
are preferable, especially for patch cords.
Nominal and maximum connector pair losses vary by
connector type, by manufacturer, and by cable type
(e.g., multimode or single mode). Nominal connector
pair loss of 0.3 dB, and maximum connector pair loss
of 0.5 dB are common for older types of FO
connectors. Small form factor types and newer
connector types may offer lesser nominal and lesser
maximum loss value.
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FO connectors shall be field installable, self-aligning and centering. FO
connectors shall match the fiber core and cladding diameters. Provide FO
cable connectors at field equipment [of the type to match the field
equipment connectors] [of type [_____]] [as shown]. Provide FO connectors
SECTION 16768A
Page 29
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