Nashville Electric Service
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Specification: 31-EC-477-4
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Description: Single-Mode Fiber Optic Cable
1.0
Scope…………….……………………………………...…………..2
2.0
Inquiry Letter…………………...……………………………...........2
3.0
General Requirements…………..…………………………...........2
4.0
Detailed Fiber Requirements……………………………………...2
5.0
Information to be Returned………………………….…................4
6.0
NES Policy……………….………………………………………….5
7.0
Revision History………….…...…………………………………….7
8.0
Approval Signatures…………………..……………………………7
The Electric Power Board of the Metropolitan Government of Nashville and Davidson County
Specification 31-EC-477-4
1.0
SCOPE
1.1
2.0
INQUIRY LETTER
2.1
3.0
The requirements of the request for quotation (RFQ) take precedence
over this specification. The cable shall contain the number of fibers
requested in the RFQ.
GENERAL REQUIREMENTS
3.1
4.0
This specification covers the requirements for furnishing single-mode
(monomode) optical glass fiber cables to the Electric Power Board of the
Metropolitan government of Nashville and Davidson County.
The Cable furnished under this specification shall be suitable for
transmission of low to high-speed data and telephone signals. It shall be
of such construction that it can be used for both aerial installations lashed
to a messenger and underground duct installation. Manufacturing and
testing should be carried out in accordance with accepted EIA/TIA
standards and industry practices.
DETAILED FIBER REQUIREMENTS
4.1 Fiber Specifications
4.1.1
Optical fibers shall be non-dispersion shifted single-mode fiber with a
glass core and glass cladding. (EIA/TIA Class IVa)
4.1.2
The cable shall contain the number of fibers requested on the ITB.
4.1.3
Nominal cladding diameter shall be 125 +/- 0.7
4.1.4
Nominal overall colored coated diameter shall be 250 +/- 15 μm.
4.1.5
Bandwidth between 1260nm and 1625nm shall be equal to or greater
than that required to pass a SONET OC-48 signal.
4.1.6
Attention difference from 1310 nm value at any wavelength 1285-1330
nm - < 0.03. Attention difference from 1550 nm value at any wavelength
1525-1575 nm - < 0.02.
4.1.7
Core-clad concentricity error < 0.5 μm.
4.1.8
Coating concentricity error < 12 μm.
4.1.9
Zero dispersion wavelength 1302-1322 nm.
m.
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Specification 31-EC-477-4
4.1.10 Dispersion slope < 0.090 ps/km/nm2.
4.1.11 Maximum dispersion from 1285 to 1330 nm < 3.4 ps/km/nm.
4.1.12 Maximum dispersion at 1550 < 18 ps/km/nm.
4.1.13 Maximum dispersion at 1625 < 22 ps/km/nm.
4.1.14 Macrobend attenuation (1 turn – 32 mm diameter) < 0.05 at 1550, 1625
nm.
4.1.15 Macrobend attenuation (100 turn – 50 mm diameter) < 0.05 at 1310, 1550
nm.
4.1.16 Macrobend attenuation (100 turn – 60 mm diameter) < 0.05 at 1550, 1625
nm.
4.1.17 PMD, LDV < 0.06 LDV
4.1.18 PMD, Max individual < 0.1 Max ind.
4.1.19 Cable cutoff wavelength <1260 nm.
4.1.20 Proof test >100.
4.2 Cabled Fiber Specifications
4.2.1
In loose tube cable spectral attenuation shall not exceed:
• 0.34 db/km @1310
• 0.31 db/km @1383 (aged)
• 0.24 db/km @1490
• 0.21 db/km @1550
• 0.24 db/km @1625
4.2.2
Point discontinuity at 1310 and 1550 < 0.05 dB
4.3 Cable Materials
4.3.1
The cable shall be loose buffer tube. The buffer tube shall be filled with a
non-toxic, hydrocarbon-based gel that contains anti-oxidant additives.
4.3.2
The cable shall have a central strength member made up of a dielectric
material and may be covered with a polyethylene overcoat to provide
proper core geometry.
4.3.3
The cable filling compound shall be a non-toxic, antifungal, nonhygroscopic, electrically nonconductive, water blocking material that can
be easily removed using ordinary, readily available solvents without
damage to cable or fiber.
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Specification 31-EC-477-4
4.4
5.0
4.3.4
The protective, waterproof jacket shall be polyethylene, UV protected,
with fiberglass strength elements immediately covering the core. Jackets
should be manufactured in accordance with good commercial practice to
be smooth, concentric, and free from cracks, bubbles, holes, or other
imperfections. A ripcord shall be provided for easy removal of the
protective outer jacket.
4.3.5
The cable shall be clearly and permanently marked with the
manufacturer, month and year of manufacture, cable type, fiber count,
NES (Nashville Electric Service), and symbols conforming to NESC
section 350G at incremental intervals along the entire length of the cable
4.3.6
The black cable jacket shall be permanently marked with a white
identifying marker running longitudinally the entire cable length. The
identifying markers shall be UV resistant for aerial applications. For
cables with an outer diameter of one inch or less, each identifying marker
and separation between the identifying markers shall be a nominal 1/8
inch. For cables with an outer diameter greater that one inch, each
identifying marker and separation between identifying markers shall have
a nominal width equal to 1/8 of the outer cable diameter.
Cable Construction
4.4.1
Completed buffer tubes are stranded around the overcoated central
member in a reverse oscillating lay to provide easy mid-span access.
4.4.2
Filler rods made of polyethylene shall be placed in core stranding
positions where buffer tubes are not used to fill out the core construction.
4.4.3
The tubes and fibers shall be color coded according to EIA/TIA 598with
twelve (12) fibers per tube.
4.4.4
The cable shall have a tensile load rating of no less than 600 lbs. during
installation and a life tensile rating of 200 lbs.
4.4.5
The cable shall be supplied on a non-returnable reel(s). The length will
be determined on the ITB. The reels must be less the 69” in overall
diameter, 44” in overall width, and have a minimum center hole diameter
2 3/4”. Each reel shall have a unique identification, which allows
matching of test reports.
INFORMATION TO BE RETURNED
5.1
Test Report
5.1.1
A test report shall be generated at the factory based on EIA/TIA
standard tests and checks made on each reel of cable. The report
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Specification 31-EC-477-4
should include results of tests and checks showing compliance
with all items in DETAILED FIBER REQUIREMENTS, 4.1, and a
certification that all other portions of this specification have been
complied with unless specifically noted as an approved exception.
5.2
Exceptions
5.2.1
5.3
List all exceptions to this specification and give a detailed
explanation for the exception with your bid response.
Final
5.3.1
Be sure your bid is signed and is FOB Nashville. Include all
information available on your material for evaluation purposes.
Also provide a contact name and telephone number in case there
are questions that we may need to resolve.
You must answer all items on APPENDIX A and submit your answers with your proposal
or your bid will not be considered.
6.0
NES POLICY
NES reserves the right to reject any or all proposals.
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Specification 31-EC-477-4
APPENDIX A
1. Manufacturer and type of cable _________________________________________________
2. Time required for shipment after receipt of order _____________________________________
3. Fiber count___________________________________________________________________
4. Cable weight (lbs/1000’) _______________________________________________________
5. Cable diameter (inches)_________________________________________________________
6. Length of cable per reel in feet___________________________________________________
7. Minimum bend radius of cable (inches) _____________________of fiber (inches) __________
8. Short term bend radius of cable (inches) ___________________Long term (inches) _________
9. List all toxic components of product, if any_________________________________________
10. Short term maximum tensile loading of cable (lbs.) ____________ Long term (lbs.) _________
11. Composition of central strength member__________________________________________
12. Continuous load tensile strength of central strength member____________________________
13. Installation tensile strength of central strength member ________________________________
14. Fiber core diameter in μm _______________________________________________________
15. Overall diameter of coated fiber in μm_____________________________________________
16. Concentricity error of core and cladding (distance between core center and cladding center divided by core
diameter) _______________________________________________________
17. Spectral attenuation (dB/km) 1300 nm ___________, 1310 nm ___________, and 1550 nm __________
18. Type of identifying marker _____________________________________________________
19. Telephone number(s) and contacts available for possible questions ______________________
20. An itemized list of exceptions to this specification, if any: _____________________________
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