271323i Communications Optical Fiber Backbone Cabling - 3 pages.pdf
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- Solicitation number
- 36C26325R0017
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This is Section 27 13 23 - Communications Optical Fiber Backbone Cabling specifications document for the VA Project 636A6-23-101 Construct Steam Tunnel at the Des Moines VAMC.
The document details requirements for three types of optical fiber backbone cables: multimode (OM4/OM5), single mode (OS1/OS2), and hybrid cables. For multimode cables, laser-optimized OM4 (aqua jacket) or OM5 (lime jacket) cables are specified with factory pre-terminated MPO connectors for computer room first-level backbone use, and field-terminated fusion splicing for connections to telecommunications rooms. Single mode cables specify OS1 for inside plant and OS2 for outside plant applications, with yellow jackets and field termination. All cables must pass Tier 1 (OLTS testing) and Tier 2 (OTDR testing) requirements, use CMP rating for plenum spaces or CMR for other areas, and be bundled in 12 or 24 strand subunits. Installation requires overhead cable tray and fiber raceway systems within telecommunications spaces, with labeling per VA Infrastructure Standards.
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Text version
Des Moines VAMC, Des Moines IA VA Project 636A6-23-101
Construct Steam Tunnel 02/07/2025
3600 30th Street REVISION 1
Des Moines, IA 50310
27 13 23 - 1
SECTION 27 13 23
COMMUNICATIONS OPTICAL FIBER BACKBONE CABLING
PART 1 - GENERAL
1.1 DESCRIPTION:
This section specifies requirements for telecommunications optical fiber backbone cabling.
1.2 SUMMARY
Section Includes:
A. Multimode Optical Fiber Backbone Cables.
B. Single Mode Optical Fiber Backbone Cables.
C. Hybrid Optical Fiber Backbone Cables.
1.3 REFERENCES
A. VA Infrastructure Standard for Telecommunications Spaces.
1.4 RELATED WORK:
A. Computer room structured cabling: Section 27 10 00, STRUCTURED CABLING.
B. Termination equipment: Section 27 11 19, COMMUNICATIONS TERMINATION
BLOCKS AND PATCH PANELS.
B. Cable labeling requirements: Section 27 05 53, IDENTIFICATION FOR
COMMUNICATIONS SYSTEMS.
1.5 SUBMITTALS:
A. Submit in accordance with Section 27 05 00, COMMON WORK RESULTS FOR
COMMUNICATIONS SYSTEMS.
PART 2 - PRODUCTS
2.1 MULTIMODE OPTICAL FIBER BACKBONE CABLES.
Multimode fiber optic backbone cables are specified for inside plant use, for data center backbone use as well as for intrabuilding campus backbone.
A. Performance Category. Laser-optimized OM4 or OM5 cables are specified.
B. Testing. All fiber optic backbone media shall pass all Tier 1 requirements (attenuation with an Optical Loss Test Set or OLTS, verification of cable length and polarity) and all Tier 2 requirements
(characterization by an Optical Time Domain Reflectometer or OTDR resulting in indication of the uniformity of cable attenuation and connector insertion loss).
C. Termination. For computer room first level backbone usage, factory pre-terminated cables with MPO connectors are required. Fiber will be field
3600 30th Street REVISION 1
Des Moines, IA 50310
27 13 23 - 2 terminated (fusion spliced) when used to connect the computer room to
Telecommunications Rooms (TRs) and other telecommunications spaces.
1. Polarity. For pre-terminated MPO-MPO cables, the polarity of the cables shall be matched to the type of fiber optic distribution cassettes specified.
D. Jacket Color.
1. OM4. Aqua.
2. OM5. Lime.
E. Jacket Rating. Communications Multipurpose Cable, Plenum (CMP) shall be specified if any portion of the cable passes through an NEC-defined plenum. Communications Multipurpose Cable, Riser (CMR) shall be specified for all other applications. CMP may be used as a substitute for CMR.
F. Bundling and Construction. Bundles consisting of multiples of sub-bundles (subunits) of 12 or 24 strands of fiber. Cables shall be dielectric and tight-buffered. Construction shall match the rear entry requirements of the fiber optic distribution or splice cassette such that the sub-bundle (subunit) remains jacketed into the cassette.
G. Length. Backbone cabling for computer room first level backbone use
(pre-terminated) shall be procured to the specific length required by the design (horizontal and vertical paths) with no more than 1 meter of excess length on each end.
2.2 SINGLE MODE OPTICAL FIBER BACKBONE CABLES.
Single mode fiber optic backbone cables are specified for inside and outside plant use, for campus backbone (interbuilding and intrabuilding) use.
A. Performance Category. OS1 is specified for inside plant applications.
Inside/outside rated OS2 is specified for applications where the pathway transits an outside plant path.
B. Testing. All fiber optic backbone media shall pass all Tier 1 requirements (attenuation with an Optical Loss Test Set or OLTS, verification of cable length and polarity) and all Tier 2 requirements
(characterization by an Optical Time Domain Reflectometer or OTDR resulting in indication of the uniformity of cable attenuation and connector insertion loss).
3600 30th Street REVISION 1
Des Moines, IA 50310
27 13 23 - 3
C. Termination. Fiber will be field terminated (fusion spliced) when used to connect the computer room to Telecommunications Rooms (TRs) and other telecommunications spaces.
D. Jacket Color. Yellow.
E. Jacket Rating. Communications Multipurpose Cable, Plenum (CMP) shall be specified if any portion of the cable passes through an NEC-defined plenum. Communications Multipurpose Cable, Riser (CMR) shall be specified for all other applications. CMP may be used as a substitute for CMR.
F. Bundling and Construction. Bundles consisting of multiples of sub-bundles (subunits) of 12 or 24 strands of fiber. Cables shall be dielectric and tight-buffered for OS1, and loose-tube gel-filled for OS2.
2.3 HYBRID OPTICAL FIBER BACKBONE CABLES.
Hybrid cables containing multiple 12 or 24 strand bundles (subunits) of multimode and/or single mode fiber are acceptable.
PART 3 - EXECUTION
3.1 IMPLEMENTATION.
A. A. All cabling and equipment shall be labeled per the requirements of the VA Infrastructure Standard for Telecommunications Spaces.
B. Interior to telecommunications spaces, install fiber optic backbone cabling in overhead cable tray and fiber raceway systems.
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