Telecommunications Policies on Specifications, Acceptable Materials, and Standard Contract Forms, 20559-20577 [E9-9763]

Agencies

• DEPARTMENT OF AGRICULTURE
• Rural Utilities Service

[Federal Register Volume 74, Number 85 (Tuesday, May 5, 2009)]
[Rules and Regulations]
[Pages 20559-20577]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E9-9763]



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Federal Register / Vol. 74, No. 85 / Tuesday, May 5, 2009 / Rules and 
Regulations

[[Page 20559]]



DEPARTMENT OF AGRICULTURE

Rural Utilities Service

7 CFR Part 1755


Telecommunications Policies on Specifications, Acceptable 
Materials, and Standard Contract Forms

AGENCY: Rural Utilities Service, USDA.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: The Rural Utilities Service, an agency delivering the United 
States Department of Agriculture's (USDA) Rural Development Utilities 
Programs, hereinafter referred to as USDA Rural Development or the 
Agency, is revising its regulation: on fiber optic cable specifications 
used by borrowers, their consulting engineers, and cable manufacturers; 
updates the specifications to meet current industry standards; includes 
additional requirements in the specifications to meet the construction 
requirements of fiber-to-the-home construction; clarifies certain 
existing definitions; separates the regulation into two distinct 
specifications for cables covering backbone and distribution plant, as 
well as for service entrance cables covering subscribers' drops; and 
includes new definitions.

DATES: Effective Date: This final rule will become effective May 5, 
2009
    Incorporation by Reference: The incorporation by reference of 
certain publications listed in this rule is approved by the Director of 
the Federal Register as of May 5, 2009.

FOR FURTHER INFORMATION CONTACT: Norberto Esteves, Chair, Technical 
Standards Committee ``A'' (Telecommunications), Advanced Services 
Division, USDA Rural Development Telecommunications Program, STOP 1550, 
Washington, DC 20250-1550. Telephone: (202) 720-0699; Fax: (202) 205-
2924; e-mail: norberto.esteves@wdc.usda.gov.

SUPPLEMENTARY INFORMATION:

Executive Order 12866

    This rule is exempt from the Office of Management and Budget (OMB) 
review for purposes of Executive Order 12866 and, therefore, has not 
been reviewed by OMB.

Executive Order 12988

    This final rule has been reviewed under Executive Order 12988, 
Civil Justice Reform. USDA Rural Development has determined that this 
final rule meets the applicable standards provided in section 3 of the 
Executive Order. In addition, all state and local laws and regulations 
that are in conflict with this proposed rule will be preempted; no 
retroactive effect will be given to the rule, and, per section 212(e) 
of the Department of Agriculture Reorganization Act of 1994 (7 U.S.C. 
6912(e)), administrative appeals procedures, if any are required, must 
be exhausted before an action against the Department or its agencies 
may be initiated.

Regulatory Flexibility Act Certification

    USDA Rural Development has determined that this final rule will not 
have a significant economic impact on a substantial number of small 
entities, as defined by the Regulatory Flexibility Act (5 U.S.C. 601 et 
seq.). The standard USDA Rural Development telecommunications loan 
documents contain provisions on procurement of products and 
construction of telecommunications facilities purchased with loan 
funds. This ensures that the telecommunications systems financed with 
loan funds are adequate to serve the purposes for which they are to be 
constructed and that loan funds are adequately secured. USDA Rural 
Development borrowers, as a result of obtaining Federal financing, 
receive economic benefits that exceed any direct cost associated with 
complying with USDA Rural Development regulations and requirements.

Information Collection and Recordkeeping Requirements

    The information collection and recordkeeping requirements contained 
in this final rule are cleared under control number 0572-0059 pursuant 
to the Paperwork Reduction Act of 1995 (44 U.S.C. Chapter 35, as 
amended).

Executive Order 13132

    This regulation will not have substantial direct effects on the 
States, on the relationship between the national government and the 
States, or on distribution of power and responsibilities among the 
various levels of government. Under Executive Order 13132, this final 
rule does not have sufficient federalism implications requiring the 
preparation of a Federalism Assessment.

Catalog of Federal Domestic Assistance

    The program described by this final rule is listed in the Catalog 
of Federal Domestic Assistance Programs under No. 10.851, Rural 
Telephone Loans and Loan Guarantees and No. 10.857, Rural Broadband 
Access Loans and Loan Guarantees. This catalog is available on a 
subscription basis from the Superintendent of Documents, the United 
States Government Printing Office, Washington, DC 20402 or at https://www.cfda.gov. Telephone: (202) 512-1800.

Executive Order 12372

    This final rule is excluded from the scope of Executive Order 
12372, Intergovernmental Consultation, which may require consultation 
with State and local officials. See the final rule-related notice 
titled ``Department Programs and Activities Excluded from Executive 
Order 12372'' (50 FR 47034), advising that USDA Rural Development 
Utilities Programs loans and loan guarantees are excluded from the 
scope of Executive Order 12372.

Unfunded Mandates

    This final rule contains no Federal Mandates (under the regulatory 
provisions of Title II of the Unfunded Mandates Reform Act of 1995 (2 
U.S.C. Chapter 25)) for State, local, and tribal governments or the 
private sector. Thus, this final rule is not subject to the 
requirements of sections 202 and 205 of the Unfunded Mandates Reform 
Act of 1995.

National Environmental Policy Act Certification

    The Agency has determined that this final rule will not 
significantly affect the quality of the human environment as defined by 
the National Environmental

[[Page 20560]]

Policy Act of 1969 (42 U.S.C. 4321 et seq.). Therefore, this action 
does not require an environmental impact statement or assessment.

Background

    On July 17, 2007, the Agency published a proposed rule [72 FR 
39028] revising the current requirements for fiber optic cables of 7 
CFR 1755.900 codified in 1995. The comment period ended on September 
17, 2007. Comments were received from three companies by the due date. 
No changes in the regulations requirements have been made, except those 
in response to comments received.
    This final rule revises the current requirements for fiber optic 
cables of 7 CFR 1755.900 codified in 1995 as well as minor editorial 
changes. The final rule sets the minimum performance requirements based 
on current industry standards. This revision was initiated to resolve 
problems the rural telecom industry is experiencing with cables 
manufactured under the existing specifications and reported by rural 
carriers and their consulting engineers. It addresses the buffer tube 
shrinkage caused by storage at low temperatures, which impairs fiber-
to-the-home system performance, and sets new requirements for drop 
cables (cables with 12 or fewer fibers operating up to 100 meters (300 
feet)).
    Cables manufactured to these revised specifications will have lower 
average bi-directional loss at fusion splices, about 0.1 decibels (dB) 
instead of the 0.2 dB currently required. For fiber-to-the-home 
applications the specification requires a maximum mid-span length of 
6.1 meters (20 feet) for cables used on mid-span applications with 
buffer tube storage. From a polarization mode dispersion standpoint, 
the maximum Statistical Parameter of Polarization Mode Dispersion 
(PMDQ) of 0.20 Picosecond per nanometer times kilometer (ps/
[radic]km) specified will allow the deployment of higher-speed 
transmission systems at longer distances: 3,000 kilometers (km) (1,864 
miles) for digital systems operating at 10 Gigabits per second (Gbps) 
and 80 km (50 miles) operating at 40 Gbps. These performance 
refinements are necessary because end-users deploying cable meeting 
this level of performance expect it to deliver high bit rate services 
during the useful economic life of these cables.
    The comments, recommendations, and responses are summarized as 
follows:
    The National Telecommunications Cooperative Association (NTCA) 
submitted one comment in support of the proposed rulemaking.
    Response: Rural Development appreciates the recommendations given 
by NTCA to this proposed regulation.
    Draka Comteq submitted one comment that addressed the following 
issues:
    (1) ``To address proper field usage of optical fiber cable, we 
recommend adding the following statement in this specification: 
Installed cable must be properly terminated. This includes properly 
securing rigid strength members (i.e. central strength member) and 
clamping the cable and jacket. It is important that cable components be 
secured to prevent movement of the cable or components over the 
operating conditions. Positive stop central strength member (CSM) 
clamps must be used and the CSM must be routed as straight and as short 
as practical to prevent bowing or breaking of the CSM. The cable and 
jacket retention must be sufficient to prevent jacket slippage over the 
operating temperature range.''
    Response: The Agency agrees with this comment from Draka Comteq. 
The statement has been added to the specification under Sec.  1755.900, 
(c)(1)(viii).
    (2) ``Section 5, Fiber Optic Service Entrance Cable (1755.901): Due 
to the product and application differences, Draka recommends that a 
separate specification be used for drop cable. We recommend using the 
Rural Development Utilities Programs Specification for Fiber Optic 
Service Entrance Cables that was finalized last year. Key drop 
specification differences include:

--Midspan tube storage should not be required
--Jacket thickness specifications are different: 0.5 mm minimum 
thickness, 0.30 mm over optional toning elements, 0.20 mm over any 
radial strength member not used as a primary strength member
--Reel wrap: applies to only reels weighing more than 75 lbs.
--Cable core: cylindrical core is not required (i.e. flat drop cable)
--Figure 8 drop will use a small messenger.''
    Response: The Agency agrees with Draka Comteq's comments. Section 
1755.901 has been added to make the cable requirements for drop cables 
a stand alone section based on the Rural Development Utilities Programs 
Specification for Fiber Optic Service Entrance Cables draft 
specification.
    TRW, Inc., submitted one comment which addressed the items as 
follows and expressed its support to the proposed regulation:
    1. ``Reference Sec.  1755.900(t)(15) Mid Span Test. Rural Fiber-to-
the-Home systems in low density applications may include as many as 15 
to 20 mid-span openings and in much of the USA are exposed to extreme 
temperature variations in the outside plant environment. Furthermore, 
an adequate length of fiber needs to be available to facilitate 
splicing in the confined space of pedestals and splice closures. It is 
also known that the various components of fiber cable are made of 
several types of materials and when such cables are opened at splice 
points the various materials are subject to differential expansion and 
contraction. It is essential that fiber optic cable be designed and 
proof tested to perform without degradation from temperature cycling 
throughout a service life of 20 to 30 years. Therefore, in order not to 
jeopardize service due to increased attenuation over the life other 
plant, the maximum increase in optical attenuation allowed after cycle 
testing should not exceed .1 dB pre mid-span opening as proposed by 
RUS.''
    Response: The Agency agrees with this comment. It is the Agency's 
viewpoint that the buffer tube needs to be designed so no attenuation 
losses occur due to micro-bending of the fibers caused by shrinking of 
the buffer tube in low temperature conditions that are within the cable 
operating temperatures range. The mid-span test has been revised and 
now calls for a maximum average loss of 0.05 dB.
    2. ``Reference Sec.  1755.900(t)(15)(iv)(c)--Mid-Span Test. For the 
reasons stated in the preceding paragraph, the mid-span lengths 
specified for testing should not be less than 16 feet as proposed by 
RUS.''
    Response: The Agency agrees with this comment. The 16-foot mid-span 
opening was set originally based on the maximum opening recommended for 
use in the Agency accepted pedestals. The Agency has received test data 
from various manufacturers that performed this mid-span test using a 
20-foot mid-span opening. To allow a buffer, the specification has been 
changed to allow only a minimum mid-span opening of 20 feet.
    3. ``Reference Sec.  1755.900(t)(15)(iv)(E)--Mid-Span Test. For the 
reasons stated above the cable sample tested should be subjected to not 
less than 5 complete cycles as proposed by RUS.''
    Response: The Agency agrees. The Mid-Span Test now calls for 5 
complete cycles.
    4. ``Reference Sec.  1755.900(b)(15)--Matched Cable: Should the 
wavelength 1310, 1550 nm or both be stated?''
    Response: No, by not stating the wavelength, the requirement 
applies to

[[Page 20561]]

both the 1310 nm MFD and 1550 nm MFD.
    5. ``Reference Sec.  1755.900(b)(15)--Matched Cable: Is the average 
bi-directional loss of .1 dB, expected at 1310 nm, 1550 nm, or both? 
This question will come up as actual splice data is evaluated in the 
field.''
    Response: At both wavelengths, however, the fiber normally is 
tested at the wavelength that will be used for transmission. For local 
loop applications splice loss measurements should be conducted at 1310 
nm since losses measured at this wavelength are generally higher than 
losses measured at 1510 nm. For long haul application using non-zero-
dispersion shifted fiber cable, such as ITU G.655 fiber, the splice 
loss measurement should be conducted at 1510 nm. The average bi-
directional loss of a fusion splice to be <= 0.1 dB is a goal and not 
every splice needs to meet this goal as long as the total budget loss 
for the link is met.
    6. ``Reference Sec.  1755.900(c)(4)--ADSS cables. Per NESC C2-2007, 
Table 232-1, the typical minimum sagged ground clearance should be 
stated as 4.7 m (15.5 feet) rather than 4.3 m (14 feet) as proposed.''
    Response: The ``typical minimum sagged'' ground clearance has been 
changed to 4.7 m (15.5 feet).
    7. ``Reference Sec.  1755.900(g)(3)--Optical Fiber Ribbon: There 
appears to be a typographical error in the paragraph, ``manufactures'' 
should be ``manufacturer.''
    Response: A correction was made.
    8. Reference Sec.  1755.900(o) --Armor. Typographical errors, 
``mills'' should be ``mils.''
    Response: A correction was made.
    9. ``Reference Sec.  1755.900(s)(1)--Zero Dispersion Optical Fiber 
Cable. Typographical errors, should be ``Table2/G.652.B'' and ``Table4/
G.652.D.''
    Response: A correction was made.
    10. Reference Sec.  1755.900(y)(1)--Packaging * * * Typographical 
error, ``continues'' should be ``continuous.''
    Response: A correction was made.
    11. Clarification of definitions.
    Response: The Agency has added language to indicate reference 
materials available online and in a bulletin format on the Agency 
acceptance process and has added the definitions of the ``List of 
Acceptable Materials'' and ``Accept/Acceptance.'' Additionally, the 
definition of ``polarization mode dispersion'' was revised for clarity 
and the definition of ``birefringence'' has been defined separately, 
rather than being incorporated into the definition of polarization mode 
dispersion.

List of Subjects in 7 CFR Part 1755

    Incorporation by reference, Loan programs--communications, 
Reporting and recordkeeping requirements, Rural areas, 
Telecommunications, Telephone.

0
For reasons set forth in the preamble, chapter XVII of title 7 of the 
Code of Federal Regulations, is amended as follows:

PART 1755--TELECOMMUNICATIONS POLICIES ON SPECIFICATIONS, 
ACCEPTABLE MATERIALS, AND STANDARD CONTRACT FORMS

0
1. The heading of part 1755 is revised to read as set out above.


0
2. The authority citation for part 1755 continues to read as follows:

    Authority:  7 U.S.C. 901 et seq., 1921 et seq., 6941 et seq.


0
3. Section 1755.900 is revised and Sec. Sec.  1755.901, 1755.902, and 
1755.903 are added to read as follows:


Sec.  1755.900  Abbreviations and Definitions.

    The following abbreviations and definitions apply to Sec. Sec.  
1755.901 and 1755.902:

(a) Abbreviations.
(1) ADSS All dielectric self-supporting;
(2) ASTM American Society for Testing and Materials;
(3) [deg]C Centigrade temperature scale;
(4) dB Decibel;
(5) CSM Central strength member;
(6) dB/km Decibels per 1 kilometer;
(7) ECCS Electrolytic chrome coated steel;
(8) EIA Electronic Industries Alliance;
(9) EIA/TIA Electronic Industries Alliance/Telecommunications 
Industry Association;
(10) FTTH Fiber-to-the-Home;
(11) Gbps Gigabit per second or Gbit/s;
(12) GE General Electric;
(13) HDPE High density polyethylene;
(14) ICEA Insulated Cable Engineers Association, Inc.;
(15) Km kilometer(s;)
(16) LDPE Low density polyethylene;
(17) m meter(s;)
(18) Max. Maximum;
(19) Mbit Megabits;
(20) MDPE Medium density polyethylene;
(21) MHz-km Megahertz-kilometer;
(22) Min. Minimum;
(23) MFD Mode-Field Diameter;
(24) nm Nanometer(s;)
(25) N Newton(s;)
(26) NA Numerical aperture;
(27) NESC National Electrical Safety Code;
(28) OC Optical cable;
(29) O.D. Outside Diameter;
(30) OF Optical fiber;
(31) OSHA Occupational Safety and Health Administration;
(32) OTDR Optical Time Domain Reflectometer;
(33) % Percent;
(34) ps/(nm [middot] km) Picosecond per nanometer times kilometer;
(35) ps/(nm\2\ [middot] km) Picosecond per nanometer squared times 
kilometer;
(36) PMD Polarization Mode Dispersion;
(37) RUS Rural Utilities Service;
(38) s Second(s);
(39) SI International System (of Units) (From the French 
Syst[egrave]me international d'unit[eacute]s); and
(40) [micro]m Micrometer.

    (b) Definitions.
    (1) Accept; Acceptance means Agency action of providing the 
manufacturer of a product with a letter by mail or facsimile that the 
Agency has determined that the manufacturer's product meets its 
requirements. For information on how to obtain Agency product 
acceptance, refer to the procedures listed at https://www.usda.gov/rus/telecom/listing_procedures/index_listing_procedures.htm, as well as 
additional information in RUS Bulletin 345-3, Acceptance of Standards, 
Specifications, Equipment Contract Forms, Manual Sections, Drawings, 
Materials and Equipment for the Telephone Program, available for 
download at https://www.usda.gov/rus/telecom/publications/bulletins.htm.
    (2) Agency means the Rural Utilities Service, an Agency which 
delivers the United States Department of Agriculture's Rural 
Development Utilities Programs.
    (3) Armor means a metal tape installed under the outer jacket of 
the cable intended to provide mechanical protection during cable 
installation and environmental protection against rodents, termites, 
etc.
    (4) Attenuation means the loss of power as the light travels in the 
fiber usually expressed in dB/km.
    (5) Bandwidth means the range of signal frequencies that can be 
transmitted by a communications channel with defined maximum loss or 
distortion. Bandwidth indicates the information-carrying capacity of a 
channel.
    (6) Birefringence means the decomposition of a pulse of light 
entering the fiber into ``two polarized pulses'' traveling at different 
velocities due to the different refractive indexes in the polarization 
axes in which the electric fields oscillate. Different refractive 
indexes in the fiber may be caused by an asymmetric fiber core, 
internal manufacturing stresses, or through external stresses from 
cabling and installation of the fiber optic cable, such as bending and 
twisting.
    (7) Cable cutoff wavelength means the shortest wavelength at which 
only one mode light can be transmitted in any of the single mode fibers 
of an optical fiber cable.

[[Page 20562]]

    (8) Chromatic Dispersion means the broadening of a light pulse as 
it travels down the length of an optical fiber, resulting in different 
spectral components of the light pulse traveling at different speeds, 
due to the fact that the index of refraction of the fiber core is 
different for different wavelengths.
    (9) Cladding means the outer layer of an optical fiber made of 
glass or other transparent material that is fused to the fiber core. 
The cladding concentrically surrounds the fiber core. It has a lower 
refractive index than the core, so light travelling in the fiber is 
maintained in the core by internal reflection at the core-cladding 
interface.
    (10) Core means the central region of an optical waveguide or fiber 
which has a higher refractive index than the cladding through which 
light is transmitted.
    (11) Cutoff Wavelength means, in single mode fiber, the shortest 
wavelength at which only the fundamental mode of an optical wavelength 
can propagate.
    (12) Dielectric Cable means a cable which has neither metallic 
members nor other electrically conductive materials or elements.
    (13) Differential Group Delay means the arrival time differential 
of the two polarized light components of a light pulse traveling 
through the optical fiber due to birefringence.
    (14) Graded Refractive Index Profile means the refractive index 
profile of an optical fiber that varies smoothly with radius from the 
center of the fiber to the outer boundary of the cladding.
    (15) List of Acceptable Materials means the latest edition of RUS 
Informational Publication 344-2, ``List of Materials Acceptable for Use 
on Telecommunications Systems of RUS Borrowers.'' This document 
contains a convenient listing of products which have been determined to 
be acceptable by the Agency. The List of Acceptable Materials is 
available on the Internet at https://www.usda.gov/rus/telecom/materials/lstomat.htm.
    (16) Loose Tube Buffer means the protective tube that loosely 
contains the optical fibers within the fiber optic cable, often filled 
with suitable water blocking material.
    (17) Matched Cable means fiber optic cable manufactured to meet the 
requirement of this section for which the calculated splice loss using 
the formula below is <=0.06 dB for any two cabled fibers to be spliced.

LOSS (dB) = -10 LOG10 [4/(MFD1/MFD2 + 
MFD2/MFD1)\2\],

where subscripts 1 and 2 refer to any two cabled fibers to be 
spliced.

    (18) Mil means a measurement unit of length indicating one 
thousandth of an inch.
    (19) Minimum Bending Diameter means the smallest diameter that must 
be maintained while bending a fiber optic cable to avoid degrading 
cable performance indicated as a multiple of the cable diameter 
(Bending Diameter/Cable Diameter).
    (20) Mode-Field Diameter means the diameter of the cross-sectional 
area of an optical fiber which includes the core and portion of the 
cladding where the majority of the light travels in a single mode 
fiber.
    (21) Multimode Fiber means an optical fiber in which light travels 
in more than one bound mode. A multimode fiber may either have a graded 
index or step index refractive index profile.
    (22) Numerical Aperture (NA) means an optical fiber parameter that 
indicates the angle of acceptance of light into a fiber.
    (23) Optical Fiber means any fiber made of dielectric material that 
guides light.
    (24) Optical Point Discontinuities means the localized deviations 
of the optical fiber loss characteristic which location and magnitude 
may be determined by appropriate OTDR measurements of the fiber.
    (25) Optical Waveguide means any structure capable of guiding 
optical power. In optical communications, the term generally refers to 
a fiber designed to transmit optical signals.
    (26) Polarization Mode Dispersion means, for a particular length of 
fiber, the average of the differential group delays of the two 
polarized components of light pulses traveling in the fiber, when the 
light pulses are generated from a sufficient narrow band source. The 
differential group delay varies randomly with time and wavelength. The 
term PMD is used in the industry in the general sense to indicate the 
phenomenon of birefringence (polarized light having different group 
velocities), and used specifically to refer to the value of time delay 
expected in a specific length of fiber.
    (27) PMDQ means the statistical upper bound for the PMD 
coefficient of a fiber optic cable link composed of M number of 
randomly chosen concatenated fiber optic cable sections of the same 
length. The upper bound is defined in terms of a probability level Q, 
which is the probability that a concatenated PMD coefficient value 
exceeds PMDQ. ITU G recommendations for fiber optic cables 
call for M = 20 and Q = 0.01%. This PMDQ value is the one 
used in the design of fiber optic links.
    (28) Ribbon means a planar array of parallel optical fibers.
    (29) Shield means a conductive metal tape placed under the cable 
jacket to provide lightning protection, bonding, grounding, and 
electrical shielding.
    (30) Single Mode Fiber means an optical fiber in which only one 
bound mode of light can propagate at the wavelength of interest.
    (31) Step Refractive Index Profile means an index profile 
characterized by a uniform refractive index within the core, a sharp 
decrease in refractive index at the core-cladding interface, and a 
uniform refractive index within the cladding.
    (32) Tight Tube Buffer means one or more layers of buffer material 
tightly surrounding a fiber that is in contact with the coating of the 
fiber.


Sec.  1755.901  Incorporation by Reference.

    (a) Incorporation by Reference: The materials listed here are 
incorporated by reference where noted. These incorporations by 
reference were approved by the Director of the Federal Register in 
accordance with 5 U.S.C. 552(a) and 1 CFR part 51. These materials are 
incorporated as they exist on the date of the approval, and notice of 
any change in these materials will be published in the Federal 
Register. The materials are available for purchase at the corresponding 
addresses noted below. All are available for inspection at the Rural 
Development Utilities Programs, during normal business hours at room 
2849-S, U.S. Department of Agriculture, Washington, DC 20250. Telephone 
(202) 720-0699, and e-mail norberto.esteves@wdc.usda.gov. The materials 
are also available for inspection at the National Archives and Records 
Administration (NARA). For information on the availability of these 
materials at NARA, call (202) 741-6030, or go to: https://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
    (b) The American National Standards Institute/Institute of 
Electrical and Electronics Engineers, Inc. ANSI/IEEE C2-2007, The 
National Electrical Safety Code, 2007 edition, approved April 20, 2006, 
(``ANSI/IEEE C2-2007''), incorporation by reference approved for Sec.  
1755.902(a), Sec.  1755.902(p), Sec.  1755.903(a), Sec.  1755.903(k) 
and Sec.  1755.903(n). ANSI/IEEE C2-2007 is available for purchase from 
IEEE Service Center, 445 Hoes Lane, Piscataway, NJ 08854, telephone 1-
800-678-4333 or online at https://standards.ieee.org/nesc/.
    (c) The following Insulated Cable Engineers Association standards 
are

[[Page 20563]]

available for purchase from the Insulated Cable Engineers, Inc. (ICEA), 
P.O. Box 1568, Carrollton, GA 30112 or from Global Engineering 
Documents, 15 Iverness Way East, Englewood, CO 80112, telephone 1-800-
854-7179 (USA and Canada) or 303-792-2181 (International), or online at 
https://global.ihs.com:
    (1) ICEA S-110-717-2003, Standard for Optical Drop Cable, 1st 
edition, September 2003 (``ICEA S-110-717''), incorporation by 
reference approved for Sec.  1755.903(a), Sec.  1755.903(b), Sec.  
1755.903(c), Sec.  1755.903(d), Sec.  1755.903(e), Sec.  1755.903(f), 
Sec.  1755.903(g), Sec.  1755.903(l), Sec.  1755.903(n), Sec.  
1755.903(p), Sec.  1755.903(u); and
    (2) ANSI/ICEA S-87-640-2006, Standard for Optical Fiber Outside 
Plant Communications Cable, 4th edition, December 2006 (``ANSI/ICEA S-
87-640''), incorporation by reference approved for Sec.  1755.902(a), 
Sec.  1755.902(b), Sec.  1755.902(c), Sec.  1755.902(d), Sec.  
1755.902(e), Sec.  1755.902(i), Sec.  1755.902(l), Sec.  1755.902(m), 
Sec.  1755.902(n), Sec.  1755.902(p), Sec.  1755.902(q), Sec.  
1755.902(r), Sec.  1755.902(u), Sec.  1755.903(b), Sec.  1755.903(g), 
Sec.  1755.903(l), Sec.  1755.903(o), Sec.  1755.903(p), and Sec.  
1755.903(s).
    (d) The following American Society for Testing and Materials (ASTM) 
standards are available for purchase from ASTM International, 100 Barr 
Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959. 
Telephone (610) 832-9585, Fax (610) 832-9555, by e-mail at 
service@astm.org, or online at https://www.astm.org or from ANSI, 1916 
Race Street, Philadelphia, PA 19103, telephone (215) 299-5585, or 
online at https://webstore.ansi.org/ansidocstore/default.asp:
    (1) ASTM A 640-97, (Reapproved 2002) [epsiv]1, Standard 
Specification for Zinc-Coated Steel Strand for Messenger Support of 
Figure 8 Cable, approved September 2002 (``ASTM A 640''), incorporation 
by reference approved for Sec.  1755.902(n);
    (2) ASTM B 736-00, Standard Specification for Aluminum, Aluminum 
Alloy and Aluminum-Clad Steel Cable Shielding Stock, approved May 10, 
2000 (``ASTM B 736''), incorporation by reference approved for Sec.  
1755.902(m) and Sec.  1755.903(j);
    (3) ASTM D 4565-99, Standard Test Methods for Physical and 
Environmental Performance Properties of Insulations and Jackets for 
Telecommunications Wire and Cable, approved March 10, 1999 (``ASTM D 
4565''), incorporation by reference approved for Sec.  1755.902(c), 
Sec.  1755.902(m), Sec.  1755.903(c) and Sec.  1755.903(j);
    (4) ASTM D 4566-98, Standard Test Methods for Electrical 
Performance Properties of Insulations and Jackets for 
Telecommunications Wire and Cable, approved December 10, 1998 (``ASTM D 
4566''), incorporation by reference approved for Sec.  1755.902(f), 
Sec.  1755.902(t) and Sec.  1755.903(t); and
    (5) ASTM D 4568-99, Standard Test Methods for Evaluating 
Compatibility Between Cable Filling and Flooding Compounds and 
Polyolefin Wire and Cable Materials, approved April 10, 1999 (``ASTM D 
4568''), incorporation by reference approved for Sec.  1755.902(h).
    (e) The following Telecommunications Industry Association/
Electronics Industries Association (TIA/EIA) standards are available 
from Electronic Industries Association, Engineering Department, 1722 
Eye Street, NW., Washington, DC 20006; or from Global Engineering 
Documents, 15 Iverness Way East, Englewood, CO 80112, telephone 1-800-
854-7179 (USA and Canada) or (303) 792-2181 (International), or online 
at https://global.ihs.com; or from TIA, 2500 Wilson Blvd, Suite 300, 
Arlington, VA 22201, telephone 1-800-854-7179 or online https://www.tiaonline.org/standards/catalog:
    (1) TIA/EIA Standard 455-3A, FOTP-3, Procedure to Measure 
Temperature Cycling on Optical Fibers, Optical Cable, and Other Passive 
Fiber Optic Components, approved May 1989, (``TIA/EIA Standard 455-
3A''), incorporation by reference approved for Sec.  1755.902(r).
    (2) [Reserved]
    (f) The following International Telecommunication Union (ITU) 
recommendations may be obtained from ITU, Place des Nations, 1211 
Geneva 20, Switzerland, telephone +41 22 730 6141 or online at https://www.itu.int/ITU-T/publications/recs.html:
    (1) ITU-T Recommendation G.652, Series G: Transmission Systems and 
Media, Digital Systems and Networks, Transmission media 
characteristics--Optical fibre cables, Characteristics of a single-mode 
optical fibre and cable, approved June 2005 (``ITU-T Recommendation 
G.652''), incorporation by reference approved for Sec.  1755.902(b), 
Sec.  1755.902(q), Sec.  1755.903(b) and Sec.  1755.903(o);
    (2) ITU-T Recommendation G.655, Series G: Transmission Systems and 
Media, Digital Systems and Networks, Transmission media 
characteristics--Optical fibre cables, Characteristics of a non-zero 
dispersion-shifted single-mode optical fibre and cable, approved March 
2006 (``ITU-T Recommendation G.655''), incorporation by reference 
approved for Sec.  1755.902(b) and Sec.  1755.902(q);
    (3) ITU-T Recommendation G.656, Series G: Transmission Systems and 
Media, Digital Systems and Networks, Transmission media 
characteristics--Optical fibre cables, Characteristics of a fibre and 
cable with non-zero dispersion for wideband optical transport, approved 
December 2006 (``ITU-T Recommendation G.656''), incorporation by 
reference approved for Sec.  1755.902(b) and Sec.  1755.902(q);
    (4) ITU-T Recommendation G.657, Series G: Transmission Systems and 
Media, Digital Systems and Networks, Transmission media 
characteristics--Optical fibre cables, Characteristics of a bending 
loss insensitive single mode optical fibre and cable for the access 
network, approved December 2006 (``ITU-T Recommendation G.657''), 
incorporation by reference approved for Sec.  1755.902(b) and Sec.  
1755.902(q); and
    (5) ITU-T Recommendation L.58, Series L: Construction, Installation 
and Protection of Cables and Other Elements of Outside Plant, Optical 
fibre cables: Special Needs for Access Network, approved March 2004 
(``ITU-T Recommendation L.58''), incorporation by reference approved 
for Sec.  1755.902(a).


Sec.  1755.902  Minimum Performance Specification for Fiber Optic 
Cables.

    (a) Scope. This section is intended for cable manufacturers, Agency 
borrowers, and consulting engineers. It covers the requirements for 
fiber optic cables intended for aerial installation either by 
attachment to a support strand or by an integrated self-supporting 
arrangement, for underground application by placement in a duct, or for 
buried installations by trenching, direct plowing, and directional or 
pneumatic boring.
    (1) General.
    (i) Specification requirements are given in SI units which are the 
controlling units in this part. Approximate English equivalent of units 
are given for information purposes only.
    (ii) The optical waveguides are glass fibers having directly-
applied protective coatings, and are called ``fibers,'' herein. These 
fibers may be assembled in either loose fiber bundles with a protective 
core tube, encased in several protective buffer tubes, in tight buffer 
tubes, or ribbon bundles with a protective core tube.
    (iii) Fillers, strength members, core wraps, and bedding tapes may 
complete the cable core.
    (iv) The core or buffer tubes containing the fibers and the 
interstices

[[Page 20564]]

between the buffer tubes, fillers, and strength members in the core 
structure are filled with a suitable material or water swellable 
elements to exclude water.
    (v) The cable structure is completed by an extruded overall plastic 
jacket. A shield or armor or combination thereof may be included under 
the jacket. The jacket may have strength members embedded in it, in 
some designs.
    (vi) Buried installation requires armor under the outer jacket.
    (vii) For self-supporting cable, the outer jacket may be extruded 
over the support messenger and cable core.
    (viii) Cables for mid-span applications for network access must be 
designed for easy mid-span access to the fibers. The manufacturer may 
use reversing oscillating stranding (SZ) described in section 6.4 of 
ITU-T Recommendation L.58, Construction, Installation and Protection of 
Cables and Other Elements of Outside Plant, 2004 (incorporated by 
reference at Sec.  1755.901(f)). The cable end user is cautioned that 
installed cable must be properly terminated. This includes properly 
securing rigid strength members (i.e., central strength member) and 
clamping the cable and jacket. It is important that cable components be 
secured to prevent movement of the cable or components over the 
operating conditions. Central strength member (CSM) clamps must prevent 
movement of the CSM; positive stop CSM clamps are recommended. The CSM 
must be routed as straight and as short as practical to prevent bowing 
or breaking of the CSM. The cable and jacket retention must be 
sufficient to prevent jacket slippage over the operating temperature 
range.
    (2) The normal temperature ranges for cables must meet paragraph 
1.1.3 of ANSI/ICEA S-87-640, Standard for Optical Fiber Outside Plant 
Communications Cable (incorporated by reference at Sec.  1755.901(c)).
    (3) Tensile Rating. The standard installation tensile rating for 
cables is 2670 N (600 1bf), unless installation involves micro type 
cables that utilize less stress related methods of installation, i.e., 
blown micro-fiber cable or All-Dielectric Self-Supporting (ADSS) cables 
(see paragraph (c)(4) of this section).
    (4) ADSS and Other Self-Supporting Cables. Based on the storm 
loading districts referenced in Section 25, Loading of Grades B and C, 
of ANSI/IEEE C2-2007, National Electrical Safety Code, 2007 
(incorporated by reference at Sec.  1755.901(b)) and the maximum span 
and location of cable installation provided by the end user, the 
manufacturer must provide a cable design with sag and tension tables 
showing the maximum span and sag information for that particular 
installation. The information included must be for Rule B, Ice and Wind 
Loading, and when applicable, information on Rule 250C, Extreme Wind 
Loading. Additionally, to ensure the proper ground clearance, typically 
a minimum of 4.7 m (15.5 feet), the end user should factor in the 
maximum sag under loaded conditions, as well as, height of attachment 
for each application.
    (5) Minimum Bend Diameter. For cable under loaded and unloaded 
conditions, the cable must have the minimum bend diameters indicated in 
paragraph 1.1.5, Minimum Bend Diameter, of the ANSI/ICEA S-87-640 
(incorporated by reference at Sec.  1755.901(c)). For very small 
cables, manufacturers may specify fixed cable minimum bend diameters 
that are independent of the outside diameter. For cables having a non-
circular cross-section, the bend diameter is to be determined using the 
thickness of the cable associated with the preferential bending axis.
    (6) The cable is fully color coded so that each fiber is 
distinguishable from every other fiber. A basic color scheme of twelve 
colors allows individual fiber identification. Colored tubes, binders, 
threads, strippings, or markings provide fiber group identification.
    (7) Cables must demonstrate compliance with the qualification 
testing requirements of this section to ensure satisfactory end-use 
performance characteristics for the intended applications.
    (8) Optical cable designs not specifically addressed by this 
section may be allowed if accepted by the Agency. Justification for 
acceptance of a modified design must be provided to substantiate 
product utility and long term stability and endurance. For information 
on how to obtain Agency product acceptance, refer to the procedures 
listed at https://www.usda.gov/rus/telecom/listing_procedures/index_listing_procedures.htm, as well as additional information in RUS 
Bulletin 345-3, Acceptance of Standards, Specifications, Equipment 
Contract Forms, Manual Sections, Drawings, Materials and Equipment for 
the Telephone Program (hereinafter ``RUS Bulletin 345-3''), available 
for download at https://www.usda.gov/rus/telecom/publications/bulletins.htm.
    (9) All cables sold to RUS telecommunications borrowers for 
projects involving RUS loan funds must be accepted by the Agency's 
Technical Standards Committee ``A'' (Telecommunications). Any design 
change to existing acceptable designs must be submitted to the Agency 
for acceptance. As stated in paragraph 8 above, refer to the procedures 
listed at https://www.usda.gov/rus/telecom/listing_procedures/index_listing_procedures.htm as well as RUS Bulletin 345-3.
    (10) The Agency intends that the optical fibers contained in the 
cables meeting the requirements of this section have characteristics 
that will allow signals having a range of wavelengths to be carried 
simultaneously.
    (b) Optical Fibers.
    (1) The solid glass optical fibers must consist of a cylindrical 
core and cladding covered by either an ultraviolet-cured acrylate or 
other suitable coating. Each fiber must be continuous throughout its 
length.
    (2) Zero-dispersion. Optical fibers must meet the fiber attributes 
of Table 2, G.652.B attributes, found in ITU-T Recommendation G.652 
(incorporated by reference at Sec.  1755.901(f)). However, when the end 
user stipulates a low water peak fiber, the optical fibers must meet 
the fiber attributes of Table 4, G.652.D attributes, found in ITU-T 
Recommendation G.652; or when the end user stipulates a low bending 
loss fiber, the optical fibers must meet the fiber attributes of Table 
7-1, G.657 class A attributes, found in the ITU-T Recommendation G.657 
(incorporated by reference at Sec.  1755.901(f)).
    (3) Non-zero-dispersion. Optical fibers must meet the fiber 
attributes of Table 1, G.656 attributes, found in ITU-T Recommendation 
G.656 (incorporated by reference at Sec.  1755.901(f)). However, when 
the end user specifies Recommendation A, B, C, D, or E of ITU-T 
Recommendation G.655 (incorporated by reference at Sec.  1755.901(f)), 
the optical fibers must meet the fiber attributes of ITU-T 
Recommendation G.655.
    (4) Multimode fibers. Optical fibers must meet the requirements of 
paragraphs 2.1 and 2.3.1 of ANSI/ICEA S-87-640 (incorporated by 
reference at Sec.  1755.901(c)).
    (5) Matched cable. Unless otherwise specified by the buyer, all 
single mode fiber cables delivered to a RUS-financed project must be 
manufactured to the same MFD specification. However, notwithstanding 
the requirements of paragraphs (d)(2) and (d)(3) of this section, the 
maximum MFD tolerance allowed for cable meeting the requirements of 
this section must be of a magnitude meeting the definition of ``matched 
cable,'' as defined in paragraph (b) of Sec.  1755.900. With the

[[Page 20565]]

use of cables meeting this definition the user can reasonably expect 
that the average bi-directional loss of a fusion splice to be <=0.1 dB.
    (6) Buyers will normally specify the MFD for the fibers in the 
cable. When a buyer does not specify the MFD at 1310 nm, the fibers 
must be manufactured to an MFD of 9.2 [micro]m with a maximum tolerance 
range of 0.5 [micro]m (362  20 microinch), 
unless the end user agrees to accept cable with fibers specified to a 
different MFD. When the end user does specify a MFD and tolerance 
conflicting with the MFD maximum tolerance allowed by paragraph (d)(5) 
of this section, the requirements of paragraph (d)(5) must prevail.
    (7) Factory splices are not allowed.
    (8) Coating. The optical fiber must be coated with a suitable 
material to preserve the intrinsic strength of the glass having an 
outside diameter of 250  15 micrometers (10  
0.6 mils). Dimensions must be measured per the methods of paragraph 
7.13 of ANSI/ICEA S-87-640 (incorporated by reference at Sec.  
1755.901(c)). The protective coverings must be free from holes, splits, 
blisters, and other imperfections and must be as smooth and concentric 
as is consistent with the best commercial practice. The diameter of the 
fiber, as the fiber is used in the cable, includes any coloring 
thickness or the uncolored coating, as the case may be. The strip force 
required to remove 30  3 millimeters (1.2  0.1 
inch) of protective fiber coating must be between 1.0 N (0.2 pound-
force) and 9.0 N (2 pound-force).
    (9) All optical fibers in any single length of cable must be of the 
same type, unless otherwise specified by end user.
    (10) Optical fiber dimensions and data reporting must be as 
required by paragraph 7.13.1.1 of ANSI/ICEA S-87-640 (incorporated by 
reference at Sec.  1755.901(c)).
    (c) Buffers.
    (1) The optical fibers contained in a tube buffer (loose tube), an 
inner jacket (unit core), a channel, or otherwise loosely packaged must 
have a clearance between the fibers and the inside of the container 
sufficient to allow for thermal expansions of the tube buffer without 
constraining the fibers. The protective container must be manufactured 
from a material having a coefficient of friction sufficiently low to 
allow the fibers free movement. The loose tube must contain a suitable 
water blocking material. Loose tubes must be removable without damage 
to the fiber when following the manufacturer's recommended procedures.
    (2) The tubes for single mode loose tube cables must be designed to 
allow a maximum mid-span buffer tube exposure of 6.096 meters (20 
feet). The buyer should be aware that certain housing hardware may 
require cable designed for 6.096 meters of buffer tube storage.
    (3) Optical fibers covered in near contact with an extrusion (tight 
tube) must have an intermediate soft buffer to allow for thermal 
expansions and minor pressures. The buffer tube dimension must be 
established by the manufacturer to meet the requirement of this 
section. Tight buffer tubes must be removable without damage to the 
fiber when following the manufacturer's recommended procedures. The 
tight buffered fiber must be strippable per paragraph 7.20 of ANSI/ICEA 
S-87-640 (incorporated by reference at Sec.  1755.901(c)).
    (4) Both loose tube and tight tube coverings of each color and 
other fiber package types removed from the finished cable must meet the 
following shrinkback and cold bend performance requirements. The fibers 
may be left in the tube.
    (i) Shrinkback: Testing must be conducted per paragraph 14.1 of 
ASTM D 4565 (incorporated by reference at Sec.  1755.901(d)), using a 
talc bed at a temperature of 95 [deg]C (203 [deg]F). Shrinkback must 
not exceed 5 percent of the original 150 millimeter (6 inches) length 
of the specimen. The total shrinkage of the specimen must be measured. 
(Buffer tube material meeting this test may not meet the mid-span test 
in paragraph (t)(15) of this section).
    (ii) Cold Bend: Testing must be conducted on at least one tube from 
each color in the cable. Stabilize the specimen to -30  1 
[deg]C (-22  2 [deg]F) for a minimum of four hours. While 
holding the specimen and mandrel at the test temperature, wrap the tube 
in a tight helix ten times around a mandrel with a diameter to be 
greater than five times the tube diameter or 50 mm (2 inches). The tube 
must show no evidence of cracking when observed with normal or 
corrected-to-normal vision.

    Note to paragraph (c)(4)(ii):  Channel cores and similar slotted 
single component core designs do not need to be tested for cold 
bend.

    (d) Fiber Identification.
    (1) Each fiber within a unit and each unit within the cable must be 
identifiable per paragraphs 4.2.1 and 4.3.1 of ANSI/ICEA S-87-640 
(incorporated by reference at Sec.  1755.901(c)).
    (2) For the following items the colors designated for 
identification within the cable must comply with paragraphs 4.2.2 and 
4.3.2 of ANSI/ICEA S-87-640 (incorporated by reference at Sec.  
1755.901(c)): loose buffer tubes, tight tube buffer fibers, individual 
fibers in multi-fiber tubes, slots, bundles or units of fibers, and the 
units in cables with more than one unit.
    (e) Optical Fiber Ribbon.
    (1) Each ribbon must be identified per paragraphs 3.4.1 and 3.4.2 
of ANSI/ICEA S-87-640 (incorporated by reference at Sec.  1755.901(c)).
    (2) Ribbon fiber count must be specified by the end user, i.e., 2, 
4, 6, 12, etc.
    (3) Ribbon dimensions must be as agreed by the end user and 
manufacturer per paragraph 3.4.4.1 of ANSI/ICEA S-87-640 (incorporated 
by reference at Sec.  1755.901(c)).
    (4) Ribbons must meet each of the following tests. These tests are 
included in the paragraphs of ANSI/ICEA S-87-640 (incorporated by 
reference at Sec.  1755.901(c)), indicated in parenthesis below.
    (i) Ribbon Dimensions (ANSI/ICEA S-87-640 paragraphs 7.14 through 
7.14.2)--measures ribbon dimension.
    (ii) Ribbon Twist Test (ANSI/ICEA S-87-640 paragraphs 7.15 through 
7.15.2)--evaluates the ability of the ribbon to resist splitting or 
other damage while undergoing dynamic cyclically twisting the ribbon 
under load.
    (iii) Ribbon Residual Twist Test (ANSI/ICEA S-87-640 paragraphs 
7.16 through 7.16.2)--evaluates the degree of permanent twist in a 
cabled optical ribbon.
    (iv) Ribbon Separability Test (ANSI/ICEA S-87-640 paragraphs 7.17 
through 7.17.2)--evaluates the ability to separate fibers.
    (5) Ribbons must meet paragraph 3.4.4.6 of ANSI/ICEA S-87-640 
(incorporated by reference at Sec.  1755.901(c)), Ribbon Strippability.
    (f) Strength Members.
    (1) Strength members may be an integral part of the cable 
construction, but are not considered part of the support messenger for 
self-supporting optical cable.
    (2) The strength members may be metallic or nonmetallic.
    (3) The combined strength of all the strength members must be 
sufficient to support the stress of installation and to protect the 
cable in service.
    (4) Strength members may be incorporated into the core as a central 
support member or filler, as fillers between the fiber packages, as an 
annular serving over the core, as an annular serving over the 
intermediate jacket, embedded in the outer jacket, or

[[Page 20566]]

as a combination of any of these methods.
    (5) The central support member or filler must contain no more than 
one splice per kilometer of cable. Individual fillers placed between 
the fiber packages and placed as annular servings over the core must 
contain no more than one splice per kilometer of cable. Cable sections 
having central member or filler splices must meet the same physical 
requirements as un-spliced cable sections.
    (6) In each length of completed cable having a metallic central 
member, the dielectric strength between the shield or armor, when 
present, and the metallic center member must withstand at least 15 
kilovolts when tested per ASTM D 4566 (incorporated by reference at 
Sec.  1755.901(d)). The voltage must be applied for 3 seconds minimum; 
no failures are allowed.
    (g) Cable Core.
    (1) Protected fibers may be assembled with the optional central 
support member, fillers and strength members in such a way as to form a 
cylindrical group.
    (2) The standard cylindrical group or core designs commonly consist 
of 4, 6, 12, 18, or 24 fibers. Cylindrical groups or core designs 
larger than the sizes shown above must meet all the applicable 
requirements of this section.
    (3) When threads or tapes are used in cables using water blocking 
elements as core binders, they must be a non-hygroscopic and non-
wicking dielectric material or be rendered by the gel or water blocking 
material produced by the ingress of water.
    (4) When threads or tapes are used as unit binders to define 
optical fiber units in loose tube, tight tube, slotted, or bundled 
cored designs, they must be non-hygroscopic and non-wicking dielectric 
material or be rendered by the filling compound or water blocking 
material contained in the binder. The colors of the binders must be per 
paragraphs (f)(2) and (f)(3) of this section.
    (h) Core Water Blocking.
    (1) To prevent the ingress of water into the core and water 
migration, a suitable filling compound or water blocking elements must 
be applied into the interior of the loose fiber tubes and into the 
interstices of the core. When a core wrap is used, the filling compound 
or water blocking elements, as the case may be, must also be applied to 
the core wrap, over the core wrap and between the core wrap and inner 
jacket when required.
    (2) The materials or elements must be homogeneous and uniformly 
mixed; free from dirt, metallic particles and other foreign matter; 
easily removed; nontoxic and present no dermal hazards. The filling 
compound and water blocking elements must contain a suitable 
antioxidant or be of such composition as to provide long term 
stability.
    (3) The individual cable manufacturer must satisfy the Agency that 
the filling compound or water blocking elements selected for use is 
suitable for its intended application by submitting test data showing 
compliance with ASTM D 4568 (incorporated by reference at Sec.  
1755.901(d)). The filling compound and water blocking elements must be 
compatible with the cable components when tested per ASTM D 4568 at a 
temperature of 80 [deg]C (176 [deg]F). The jacket must retain a minimum 
of 85% of its un-aged tensile and elongation values.
    (i) Water Blocking Material.
    (1) Sufficient flooding compound or water blocking elements must be 
applied between the inner jacket and armor and between the armor and 
outer jacket so that voids and air spaces in these areas are minimized. 
The use of flooding compound or water blocking elements between the 
armor and outer jacket is not required when uniform bonding, paragraph 
(o)(9) of this section, is achieved between the plastic-clad armor and 
the outer jacket.
    (2) The flooding compound or water blocking elements must be 
compatible with the jacket when tested per paragraphs 7.19 and 7.19.1 
of ANSI/ICEA S-87-640 (incorporated by reference at Sec.  1755.901(c)). 
The aged jacket must retain a minimum of 85% of its un-aged tensile 
strength and elongation values when tested per paragraph 7.19.2.3. The 
flooding compound must exhibit adhesive properties sufficient to 
prevent jacket slip when tested per paragraph 7.30.1 of ANSI/ICEA S-87-
640 and meets paragraph 7.30.2 of ANSI/ICEA S-87-640 for minimum sheath 
adherence of 14 N/mm for armored cables.
    (3) The individual cable manufacturer must satisfy the Agency by 
submitting test data showing compliance with the appropriate cable 
performance testing requirements of this section that the flooding 
compound or water blocking elements selected for use is acceptable for 
the application.
    (j) Core Wrap.
    (1) At the option of the manufacturer, one or more layers of 
dielectric material may be applied over the core.
    (2) The core wrap(s) can be used to provide a heat barrier to 
prevent deformation or adhesion between the fiber tubes or can be used 
to contain the core.
    (k) Inner Jackets.
    (1) For designs with more than one jacket, the inner jackets must 
be applied directly over the core or over the strength members when 
required by the end user. The jacket must be free from holes, splits, 
blisters, or other imperfections and must be as smooth and concentric 
as is consistent with the best commercial practice. The inner jacket 
must not adhere to other cable components such as fibers, buffer tubes, 
etc.
    (2) For armored and unarmored cable, an inner jacket is optional. 
The inner jacket may absorb stresses in the cable core that may be 
introduced by armor application or by armored cable installation.
    (3) The inner jacket material and test requirements must be the 
same as the outer jacket material, except that either black or natural 
polyethylene may be used and the thickness requirements are included in 
paragraph (m)(4) of this section. In the case of natural polyethylene, 
the requirements for absorption coefficient and the inclusion of 
furnace black are waived.
    (4) The inner jacket thickness must be determined by the 
manufacturer, but must be no less than a nominal jacket thickness of 
0.5 mm (0.02 inch) with a minimum jacket thickness of 0.35 mm (0.01 
inch).
    (l) Outer Jacket.
    (1) The outer jacket must provide the cable with a tough, flexible, 
protective covering which can withstand exposure to sunlight, to 
atmosphere temperatures, and to stresses reasonably expected in normal 
installation and service.
    (2) The jacket must be free from holes, splits, blisters, or other 
imperfections and must be as smooth and concentric as is consistent 
with the best commercial practice.
    (3) The jacket must contain an antioxidant to provide long term 
stabilization and must contain a minimum of 2.35 percent concentration 
of furnace black to provide ultraviolet shielding measures as required 
by paragraph 5.4.2 of ANSI/ICEA S-87-640 (incorporated by reference at 
Sec.  1755.901(c)), except that the concentration of furnace black does 
not necessarily need to be initially contained in the raw material and 
may be added later during the jacket making process.
    (4) The raw material used for the outer jacket must be one of the 
types listed below.
    (i) Type L1. Low density, polyethylene (LDPE) must conform to the 
requirements of paragraph 5.4.2 of ANSI/ICEA S-87-640 (incorporated by 
reference at Sec.  1755.901(c)).

[[Page 20567]]

    (ii) Type L2. Linear low density, polyethylene (LLDPE) must conform 
to the requirements of paragraph 5.4.2 of ANSI/ICEA S-87-640 
(incorporated by reference at Sec.  1755.901(c)).
    (iii) Type M. Medium density polyethylene (MDPE) must conform to 
the requirements of paragraph 5.4.2 of ANSI/ICEA S-87-640 (incorporated 
by reference at Sec.  1755.901(c)).
    (iv) Type H. High density polyethylene (HDPE) must conform to the 
requirements of paragraph 5.4.2 of ANSI/ICEA S-87-640 (incorporated by 
reference at Sec.  1755.901(c)).
    (5) Particle size of the carbon selected for use must not average 
greater than 20 nm.
    (6) The outer jacketing material removed from or tested on the 
cable must be capable of meeting the performance requirements of Table 
5.1 found in ANSI/ICEA S-87-640 (incorporated by reference at Sec.  
1755.901(c)).
    (7) Testing Procedures. The procedures for testing the jacket 
specimens for compliance with paragraph (n)(5) of this section must be 
as follows:
    (i) Jacket Material Density Measurement. Test per paragraphs 7.7.1 
and 7.7.2 of ANSI/ICEA S-87-640 (incorporated by reference at Sec.  
1755.901(c)).
    (ii) Tensile Strength, Yield Strength, and Ultimate Elongation. 
Test per paragraphs 7.8.1 and 7.8.2 of ANSI/ICEA S-87-640 (incorporated 
by reference at Sec.  1755.901(c)).
    (iii) Jacket Material Absorption Coefficient Test. Test per 
paragraphs 7.9.1 and 7.9.2 of ANSI/ICEA S-87-640 (incorporated by 
reference at Sec.  1755.901(c)).
    (iv) Environmental Stress Crack Resistance Test. For large cables 
(outside diameter >= 30 mm (1.2 inch)), test per paragraphs 7.10.1 
through 7.10.1.2 of ANSI/ICEA S-87-640 (incorporated by reference at 
Sec.  1755.901(c)). For small cables (Diameter < 30 mm (1.2 inch)), 
test per paragraphs 7.10.2 through and 7.10.2.2 of ANSI/ICEA S-87-640. 
A crack or split in the jacket constitutes failure.
    (v) Jacket Shrinkage Test. Test per paragraphs 7.11.1 and 7.11.2 of 
ANSI/ICEA S-87-640 (incorporated by reference at Sec.  1755.901(c)).
    (8) Jacket Thickness. The outer jacket must meet the requirements 
of paragraphs 5.4.5.1 and 5.4.5.2 of ANSI/ICEA S-87-640 (incorporated 
by reference at Sec.  1755.901(c)).
    (9) Jacket Repairs. Repairs are allowed per paragraph 5.5 of ANSI/
ICEA S-87-640 (incorporated by reference at Sec.  1755.901(c)).
    (m) Armor.
    (1) A steel armor, plastic coated on both sides, is required for 
direct buried cable manufactured under this section. Armor is optional 
for duct and aerial cable, as required by the end user. The plastic 
coated steel armor must be applied longitudinally directly over the 
core wrap or the intermediate jacket and have a minimum overlap of 3.0 
millimeters (118 mils), except for small diameter cables with diameters 
of less than 10 mm (394 mils) for which the minimum overlap must be 2 
mm (79 mils). When a cable has a shield, the armor should normally be 
applied over the shielding tape.
    (2) The uncoated steel tape must be electrolytic chrome coated 
steel (ECCS) and must meet the requirements of paragraph B.2.4 of ANSI/
ICEA S-87-640 (incorporated by reference at Sec.  1755.901(c)).
    (3) The reduction in thickness of the armoring material due to the 
corrugating or application process must be kept to a minimum and must 
not exceed 10 percent at any spot.
    (4) The armor of each length of cable must be electrically 
continuous with no more than one joint or splice allowed in any length 
of one kilometer of cable. This requirement does not apply to a joint 
or splice made in the raw material by the raw material manufacturer.
    (5) The breaking strength of any section of an armor tape, 
containing a factory splice joint, must not be less than 80 percent of 
the breaking strength of an adjacent section of the armor of equal 
length without a joint.
    (6) For cables containing no flooding compound over the armor, the 
overlap portions of the armor tape must be bonded in cables having a 
flat, non-corrugated armor to meet the mechanical requirements of 
paragraphs (t)(1) through (t)(16)(ii) of this section. If the tape is 
corrugated, the overlap portions of the armor must be sufficiently 
bonded and the corrugations must be sufficiently in register to meet 
the requirements of paragraphs (t)(1) through (t)(16)(ii) of this 
section.
    (7) The armor tape must be so applied as to enable the cable to 
pass the Cable Low (-30 [deg]C (-22 [deg]F)) and High (60 [deg]C (140 
[deg]F)) Temperatures Bend Test, as required by paragraph (t)(3) of 
this section.
    (8) The protective coating on the steel armor must meet the 
Bonding-to-Metal, Heat Sealability, Lap-Shear and Moisture Resistance 
requirements of Type I, Class 2 coated metals per ASTM B 736 
(incorporated by reference in Sec.  1755.901(d)).
    (9) When the jacket is bonded to the plastic coated armor, the bond 
between the plastic coated armor and the outer jacket must not be less 
than 525 Newtons per meter (36 pound-force) over at least 90 percent of 
the cable circumference when tested per ASTM D 4565 (incorporated by 
reference at Sec.  1755.901(d)). For cables with strength members 
embedded in the jacket, and residing directly over the armor, the area 
of the armor directly under the strength member is excluded from the 90 
percent calculation.
    (n) Figure 8 Aerial Cables.
    (1) When self-supporting aerial cable containing an integrated 
support messenger is supplied, the support messenger must comply with 
the requirements specified in paragraphs D.2.1 through D.2.4 of ANSI/
ICEA S-87-640 (incorporated by reference at Sec.  1755.901(c)), with 
exceptions and additional provisions as follows:
    (i) Any section of a completed strand containing a joint must have 
minimum tensile strength and elongation of 29,500 Newtons (6,632 pound-
force) and 3.5 percent, respectively, when tested per the procedures 
specified in ASTM A 640 (incorporated by reference in Sec.  
1755.901(d)).
    (ii) The individual wires from a completed strand which contains 
joints must not fracture when tested per the ``Ductility of Steel'' 
p