Wire and Cable Standards

Section VII: Inter-Building Cable (HSDN)

The following specifications describe the installation of the fiber optic cable
for the HSDN backbone.

Fiber Optic Cable Composition

Fiber optic installation shall consist of a component that contains 12 strand
62.5/125 um multi-mode and 10/125 um 12 strand single mode fiber cable.

Fiber Optic Cable

The following fiber optic cable type will be used unless otherwise agreed to
by Harvard:

• cable construction shall be field-proven, double-buffered/double-filled
  type which shall restrict water migration within the cable

• the contractor shall install fiber optic cable rated by the manufacturer
  for temperatures between -40F and +160F

• axial strength member shall be made from a high-strength
  dimensionally-stable, non-conductive composite material,
  buffered with an energy absorber to improve the impact
  and crush characteristics of the fiber optic cable

• intersplices of the fiber optic cable's core will be flooded with a
  non-hygroscopic filling compound for added protection from moisture
  ingress under freeze/thaw or high temperature conditions

• outer jacket shall be made from a proven polyethylene material and
  sequentially marked.

Fiber Optic Cable Termination

Fiber optic cables and fiber strands specified shall be finished and
terminated in termination equipment as specified. Termination equipment
will be fiber optic Patch Panels with "ST" type connectors and be large
enough to accommodate the fiber optic cables and fiber strands. The vendor
will provide and install the fiber optic Patch Panels. All patch panel
enclosures will be large enough to accommodate all fiber optic terminations
possible at the panel. All strands must be terminated on Radiant /Pass & Seymour/Legrand patch panels at both ends. Multimode terminated with a silver or chrome colored connector and the singlemode with a black colored (Siecor TER-516) connector.

Fiber Optic Testing and Acceptance

The vendor will provide Harvard with total individual link test and results
documentation on each fiber run, cable, and strand before acceptance of the
backbone.

Fiber Optic Functional Specifications

10/125 Micron Single-mode Fiber Specification

Functional Specifications - Fiber Cable

	Maximum Attenuation:
               @ 1300nm       0.4dB/km
               @ 1550nm       03.dB/km
        
   Maximum Dispersion:
               @ 1290 - 1330nm 2.6psc/nm-km
               @ 1550nm       20psec/nm-km
        
   Cutoff Wavelength      1030 - 1250nm
        
        
   Specified fiber parameters:
       Mode Field diameter @ 1300nm    8.5 ± 0.5 Microns
       Zero Dispersion Wavelength      1311.5 ± 10nm
       Attenuation Uniformity @ 1300nm and 1550nm  0.1dB
            Core Concentricity                1.0 Microns
            Clad Non-Circularity            Ñ 0.98
            Clad Diameter            125 ± 2.0 Microns
            Coating Diameter              250 ± 15 Microns
            Proff Strength           50 kpsi
            Refractive Index Difference             0.36%
               Core Diameter        10 ± .5 Microns
        
            Other Parameters:
               Index Profile          Step Index
                   Glass Type               Si - Ge
                   Lengths          up to 12.0 km
        
    62.5/1.25 Micron Multimode Fiber Specification  
    Functional Specification 
        
                Maximum Attenuation Range:                   
             @870 nm           3.5 - 3.75dB/km
                @1300 nm              1.5db
        
                Minimum Bandwidth:
                @850nm        160MHz-km
                @1300 nm              500MHz-km
        
        Specified fiber parameters:
                  Core/Cladd Offset   32.00 Microns
                  Cladding Diameter   125 ± 2.0 Microns
                  Core Ovality                6% Max
                  Coating Diameter    250 ± 15 Microns
               Proff Strength          50 kpsi
                  Core Diameter               62.5 ± 3 Microns
                  Numerical Aperture  0.275 ± 0.015
                Refractive Index Difference           2%
        
        Other Parameters:
                  Index Profile               Graded index
                  Glass Type                  Si - Ge
               Lengths         up to 2.0 km continuous reels
               
        
        Fiberoptic Cable  Requirements
        
        Multimode fibers:  
        850 nm  Maximum Attenuation 3.75 dB/km  
               Minimum Transmission 160 MHz-km
        1300 nm Maximum Attenuation 1.5 dB/km
               Minimum Transmission  500 MHz-km
        
        Singlemode fibers:
        1300 nm     Maximum Attenuation  0.4 dB/km
        1550 nm     Maximum Attenuation  0.3 dB/km
               Maximum dispersion at 1550nm - 20psec/nm-km
               Maximum bent loss for a 75mm bend - 0.1db
        

• All multimode fibers must have a core diameter of 62.5um

• All singlemode fibers must have a core diameter between 8.0 and 8.5 um

• The cladding diameter for all fibers must be 125um

• All multimode fiber optic must be listed as FDDI gradev

• The requested fiber counts per route are a minimum, larger fiber counts may be installed at the contractor's option

• For cables listed as single cables with mixed multimode and singlemode fibers, the contractor may substitute multiple cables unless otherwise specified by Harvard.

• The cable must not contain any conductive elements

Fiber Optic Cable

Installation Requirements

1. It is the contractor's responsibility to see that all installations and materials conform to all applicable codes.

2. All fiber optic connectors must be of type ST.

3. All fiber optic terminations must meet the following requirements:
   • maximum attenuation through a cross-connect from any terminated fiber to any other terminated fiber - 2.0dB.

   • maximum optical attenuation through any splice (fusion or mechanical) - 0.3db

    

4. The specific paths of all cables must be approved by Harvard.

5. The specific mounting methods of all cables must be approved by Harvard.

6. All patch panels must be wall mounted type unless noted.

7. All splice boxes must be wall mount type unless noted.

8. All wall mount locations must be selected by Harvard.

9. All patch panels and splice boxes must have covers that can be closed and locked, except where specified by Harvard.

10. All cables must be in innerduct if in conduit unless specifically exempted by Harvard in writing.

11. Cable runs in some open corridors will require innerduct or conduit, these will be specified by Harvard.

12. A cable loop, of at least 10 feet in length, must be provided for every 500 feet of run and/or at each "major transition" along the cable's route. Major transitions are considered to be: appropriate corners, entrances and exits to conduits, and termination points.

13. At all termination points, fiber strands must be in protective tubes from the cable's outer jacket to the connectors.

14. Three innerducts must be installed in any empty conduit unless specifically exempted by Harvard in writing. Pull cords must be left in the unused innerducts.

15. A pull cord must be left in any used conduit where requirement #14
    was not followed unless specifically exempted by Harvard in writing.
    

1. All patch panels must have labels uniquely identifying each fiber including the specific location of the remote end.

2. All cables must be marked with durable tag (such as plastic) at each end of a conduit, at each end of a passage through a wall or floor, in each hand or manhole, at each corner, and at least every 100 feet of run. These marking tags must have enough information to uniquely identity each separate cable.

3. New cable routes must be marked with large metal or plastic CAUTION signs at least every 100', these tags will be provided by Harvard.

4. The covers of all patch panels and splice boxes must be labeled indicating:
   • The presence of fiber optic cable.

   • A phone number to call for questions (496-4736).

Test Requirements

1. Attenuation must be measured in accordance with a procedures detailed in EIA-455-59.

2. All terminated and unterminated fibers must be tested.

3. All fibers must be tested with an OTDR in one direction.

4. All fibers must be tested with an optical power meter in both directions.

5. All multimode fibers are to be tested at 850nm and 1300nm.

6. All singlemode fibers are to be tested at 790nm, 1300nm and 1550nm

Documentation Requirements

1. Two copies of the final documentation must be submitted to Harvard before final job acceptance.

2. The documentation must include:
   • Copies of all test results.

   • Accurate maps of all cable runs.

   • If construction is required, a survey plan must be included. This survey must follow the procedures listed in the Harvard University Planning Group document "Surveying Standards and Recovery Notes"

Warrantee Requirements

All material and workmanship must be covered by a warrantee with a duration of at least one year.

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