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AUTHORIZED & EXCLUSIVE DISTRIBUTOR
Head Office
Suite 202, The Colonnade Building, 27 Nguyen Trung Truc St.,
District 1, Hochiminh City, Vietnam
Tel: 84.8 823-1693 Fax: 84.8 823-1665

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Email:
ANSI/TIA/EIA 758

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Table of ContentsCabling Infrastructure

Introduction
Building Entrance Terminals

Cabling


ANSI/TIA/EIA 758

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CABLING INFRASTRUCTURE

General

Outside Plant Definition

Outside plant is defined as those communications pathways, spaces and media which
are located outside of the building walls. This includes, but is not limited to the cable
(copper and fiber), splices, conduit, manholes, handholes, poles and hardware related
to the attachment and support of the various forms of media.

Function

The function of customer-owned OSP cabling infrastructure is to provide connections
between building entrance facilities, structures in a campus environment, or
telecommunications pedestals or cabinets. Customer-owned OSP cabling consists of
the backbone cables, splices, terminations, and patch cords or jumpers used for
backbone-to-backbone connection. The customer-owned OSP cabling infrastructure
shall meet the requirements of the local authority(s) and local codes.



The recommended topology for customer-owned OSP cabling is a star configuration.
This is the same type of star topology that is recommended for a local area network.
In the case where a star topology cannot be used, consider a hierarchical star. By
implementing a star, or hierarchical star the system can be managed and maintained
easier than other topologies. The same advantages of a LAN star topology can be
found in a campus star topology.

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In a star topology one of the buildings will act as the MC and feed out the backbone
cables to the various buildings. In a hierarchical star there may be a building acting as
an MC, and the another group of buildings is served by a building acting as an IC.

Other types of topologies that may be used are a bus or tree and branch topology,
physical wired star/virtual ring and a ring. A ring topology may be a single path ring,
a counter rotating redundant ring or several attached rings.

Each type has its disadvantages and advantages depending on the layout of the
network, media chosen and applications being run, and as well, the overall goal of the
network.

Recognized Cables

Bonding and grounding shall meet the appropriate requirements and practices of
applicable authorities and codes. Additionally, grounding and bonding within buildings
shall conform to ANSI/TIA/EIA-607 requirements, and the National Electrical Safety
Code (NESC) between buildings. Failure to follow these standards and codes can
result in interference, improper operation and possible harm to those operating the
system.ANSI/TIA/EIA 758

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BUILDING ENTRANCE TERMINALS

General

This portion of the standard covers the requirements for building entrance terminals
located at the cabling entrance to building facilities where the transition between
inside and outside environments occur. Building entrance terminals can be used on
the outside of the building or on the inside, with the inside being the primary choice.
Building entrance terminals are available in sizes such as 2-pair, 4-pair, 6-pair, and
multiples of 10- and 25-pair. It is desirable that terminal blocks for be of the IDC
type, such as 110.

Terminal Protection


Aerial (self-support and lashed)

Aerial cables come in two major classifications, self supporting and non self
supporting. Self-supporting cable has a steel support messenger designed into the
cable. This type of cable is more sometimes referred to as "Figure 8" cable because its
cross sectional view looks like an "8". OSP cable intended for aerial use without a
support messenger shall be lashed to a support messenger.

Direct Buried Cable

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Direct buried cables are placed directly into the ground through a variety of methods
such as vibratory plough or trenching. These cables shall have a moisture barrier
compound within the cable to prevent moisture from entering the cable should the
outer sheath be penetrated.

Underground Cable

Underground cables are placed in a duct system rather that directly into the ground.
This helps prevent against rodent and environmental damage. Cables placed in a duct
system may, or may not contain a moisture barrier compound.


ANSI/ICEA S-85-625

Broadband Filled OSP (BBOSP)

ANSI/ICEA S-99-689

Broadband Air Core OSP

ANSI/ICEA S-98-688

Filled Screened Cable

ANSI/ICEA S-84-608

Air Core Screened Cable

ANSI/ICEA S-85-625

Buried Service Wire*

ANSI/ICEA S-86-634**

Aerial Service Wire*

ANSI/ICEA S-89-648**

Notes
* The performance requirements of the cable should be verified to ensure
they meet the overall design criteria.

Mechanical and electrical requirements for 75 ohm trunk, feeder and distribution
coaxial cable are found in the Society of Cable Television Engineers (SCTE) document
IPS-SP-100.

Connecting Hardware

Connecting hardware used with OSP Coaxial Cable is referred to as "N" type
connecting hardware, and it is designed to fit each particular cable size and type.
Connecting hardware includes connectors, taps and splitters. The designer should
verify with the cable manufacturer regarding connecting hardware that is compatible
with their cable.

Installation Requirements

The SCTE document "Recommended Practices for Coaxial Cable Construction and
Testing, Issue 1, Section 1" provides the necessary information required for proper
installation practices.

Testing

The minimum test requirements for 75 Ohm coaxial cable shall include a continuity
test for the center conductor and shield. The installer may test the following
parameters;

• Attenuation

• Length

• Characteristic impedanceQuang Dung Technology Distribution Company Page 8 of 35
Both multimode fibers and singlemode fibers or a combination of these fiber types are
acceptable. When both types of optical fibers are combined, some means of
segregating the fibers by type shall be used.

Cable Performance

OSP optical fiber cable shall meet the performance requirements of ANSI/ICEA S-83-
640 and ANSI/TIA/EIA-568-B.3.

Cable Construction Types

OSP optical fiber cable shall meet the physical requirements of ANSI/ICEA S-83-640.
Optical fiber cables come in several designs with many construction options.

Duct Cables

Duct cables are generally non-armored cables. All-dielectric versions (no metallic
components), which incorporate a nonmetallic central member, are available and are
suitable for duct, aerial or conduit placement.

Armored Cables

Armored cables have a steel armor layer added under the outer cable jacket. The
armor is added to improve the rodent resistance capability of a direct-buried cable,
and also provides an extra layer of protection against other factors, such as rocky
soil.


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Some cables can be installed in both outdoor and indoor locations. This type of cable
combines the attributes of an outdoor cable, ie: water blocking and UV resistance, as
well as a flame resistant jacket (riser rated)suitable for indoor applications. This
avoids transitioning to an indoor fiber, thereby reducing costs and system losses due
to splicing and/or connectorization. However, the designer should be aware that the
cost of this type of fiber is higher than regular outdoor fiber, and that there is a cost
point where using the two individual fiber types is more advantageous.

Drop Cables

Drop cables are typically small diameter, low fiber count cables with limited
unsupported span distances. They are used to feed a small number of fibers from a
higher fiber count cable into a single location.CONNECTING HARDWARE

OSP Twisted-Pair Connecting Hardware

General

The connecting hardware includes terminal blocks that are used for transition from

cable

• non-corrosive to metals

• resist deterioration when exposed to chemical pollutants and UV radiation.

Transmission

ANSI/TIA/EIA 758

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The transmission requirements of connecting hardware used in the OSP shall comply
with connecting hardware requirements of ANSI/TIA/EIA 568-B.2. It should be noted
here that ANSI/TIA/EIA-B generally applies to the intra building components.
However, these components are the same ones used to terminate and splice OSP
cable. The testing performed on OSP cable is not subject to the same testing for the
permanent link or channel tests of the intra building cable, unless the OSP cable is a
category rated cable which is part of the loop being tested. An example may be a
school having a portable classroom located within the 100 meter channel limitation
that uses a category rated OSP cable to go from the main building to the portable.

Terminal Block Requirements

General

Test Points

Terminal blocks shall allow access to test points for each pair without disconnecting
the service wire from the terminal or puncturing the wire insulation.
NOTE - High impedance probes are needed to use the test access points for live
high frequency applications.

Stub cable

The stub cable shall use standard color coding to indicate individual pairs and tip and
ring.

Cross-Connect Block Requirements

General

Cross-connect blocks are used in OSP to connect feeder pair to distribution pair. Cross
connect blocks may be located in cabinets, on walls or possibly even a rack designed
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for high density applications. In a cross connect scenario the incoming feeder lines
pairs are each terminated on a feeder cross connect block, following the appropriate
color codes. The distribution cable for the building is also terminated on a distribution


• provide a means for identifying individual terminal pairs either on the block or
an adjacent surface

• have removable red markers available for attachment to a pair termination to
designate special circuits

• have markers withstand all environmental exposure required for the block
without becoming unserviceable

• be designed to eliminate the possibility of electrical shorts between any two
terminals during jumper wire placement

Test Points

All terminals shall allow access to test points for each pair without disconnecting the
jumper wire from the terminal or puncturing the wire insulation.

Terminal Density

Terminals shall be arranged to allow for a neat and compact installation, and allow for
proper jumper terminations.

Wiring Harness

When a wiring harness is used to connect the cross-connect block to the distribution
cable, the cable shall use standard color coding to indicate individual pairs and to
indicate tip and ring polarity.

Optical Fiber Connectors

times the cable diameter.

Optical Fiber Cable Testing

Testing of OSP optical fiber cabling shall be conducted according to ANSI/TIA/EIA-
568-B.1.11.SPLICING
Overview

Splicing can be defined as the joining of two conductors or fibers together to restore
the conductor continuity between two points. Since most cables are constructed of
more than one or two conductors or fibers, splicing generally involves more than one
or two pairs, and generally involves restoring the integrity of the cable sheath, armor
and shield.

Splicing begins with the joining of the conductors with a single splice. In copper
splicing one of the types of splices used is the 3M Scotchlok. Once all of the
conductors have been spliced they will be inserted into the splice enclosure which is
selected by the location of the splice enclosure. In a fiber optic splice, the fibers are
joined by a mechanical or fusion splice and then inserted into a splice tray.

For the purpose of this Standard, the term splice closure shall include bonding
hardware, sealing materials and the closure housing.COPPER SPLICING
General



Due to the variety of connectors, manufacturers shall provide all of the necessary
tooling required to terminate their connectors.

Materials

Metal components shall:

• resist corrosion, cracking and pitting

• not produce significant galvanic corrosion effects on other metals likely to be
present in their use environment

Insulating materials:

• shall be resistant to fungi, heat, and cable cleaning solvents.

• must be compatible with metals and other materials such as conductor
insulation and filling compounds used in the manufacture of cable.Plastic materials shall:

• be non-corrosive to metals

• resist deterioration when exposed to chemical pollutants and sunlight.

Connector filling compounds shall:

• be compatible with other connector and cable materials

smaller gauge splices is 75% of the wire breaking strength.

Insulation Resistance

Splicing connectors that are to be used in severe service conditions shall be tested for
moisture resistance. This test involves immersing the moisture filled or resistant
connector tap water for a period of one week. The insulation resistance shall then be
measured between each conductor and the water bath with 250 Vdc applied. No more
than 10 percent of the conductors shall be less than 10
6
ohms, not more than 25
percent shall be less than 10
8
ohms, and the remainder shall be greater than 10
9

ohms. After drying, the test units shall be restored to greater than 10
9
ohms. Those
that fall below 10
8
ohms shall be inspected for corrosion. If there is evidence of
corrosion, the unit shall be deemed to have failed the test. It should be noted that
this is a criteria for the manufacturer to follow and not the installation contractor.

Salt Fog Exposure

Terminated (or spliced) filled samples shall be exposed to salt fog per ASTM B 117 for
a period of 48 hours. The resistance though each splice shall not increase by more
than 2 milli-ohms as a result of this exposure.

Minimum Bend Radius
During Installation

Minimum Bending Radius
After Installation

Non Gopher Resistant

10

8

Gopher Resistant

15

10