17120.pdf
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- MDC Guaynabo - Upgrade Control Center Federal contract opportunity
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- IFBP0306JPZ50004
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Technical Design Guideline 17120
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FBOP TECHNICAL DESIGN GUIDELINES ISSUE DATE: JANUARY 20, 2009
SENSITIVE - LOU
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-1
SECTION 17120 - FIBER OPTIC CABLE DISTRIBUTION SYSTEM
PART 1 - GENERAL
1.1 SUMMARY
A. This section covers the facility wide fiber optic distribution system as shown on the drawings or as required to support the systems defined in these specifications.
The work under this section consists of furnishing materials and equipment, performing labor and services necessary for the installation of the facility wide fiber optic distribution system required for the security electronics, communications, and fire alarm system.
B. Related Work Specified Elsewhere: Refer to all other Division 17 specification sections and drawings, and to the specifications and drawings under the General Construction Contract to ascertain the extent of work included.
1.2 SUBMITTALS
A. Since the Division 17 systems must be reviewed by the Contracting Officer as a system, no individual, specific submittal shall be made for this section.
Submittals shall be packaged in groups and shall be made in accordance with the General Provisions (Section 17000) of these specifications.
B. When making the submittal as required by Section 17000, include this additional information.
1. Submit Quality Assurance data sheets prepared by the cable supplier for each cable reel.
2. Submit final test results for tests conducted on each installed fiber. Data shall include power through loss meter test results.
3. Test results shall be bound in a single binder titled "Fiber Optic Cable Distribution Performance Measurements". In addition to the data sheets for each fiber test, the data shall be organized in tables with the fiber identifier on the left hand column and columns for average loss, measured link length, and link loss.
1.3 SYSTEM DESCRIPTION
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-2
A. GENERAL
1. A facility wide fiber optic cable system shall be furnished and installed to support the following systems or functions:
a. Closed circuit television video and control data (FCI, USP only)
b. Sentry LAN system
c. Commissary LAN System
d. Programmable Logic Controllers (FCI, USP only)
e. Inmate Telephone Monitoring System (FCI, USP only)
f. UNICOR LAN System (FCI, USP only)
g. Guard Tower Special System (USP only)
h. Perimeter System (FCI, USP only)
2. Cable system shall consist of multi and single mode, tight buffer cables designed for underground duct, riser applications, and horizontal cable runs.
3. Cables shall be installed in the facility riser conduit system and routed in accordance with the fiber optic site distribution riser diagram shown in the drawings. (FDC only)
4. Cables shall be installed in the site duct bank system and routed in accordance with the fiber optic site distribution riser diagram shown in the drawings. (FCI, USP only)
5. Cables shall be terminated in Light Cable Terminals (LCT) as shown on the drawings.
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-3
6. Cables shall be installed point-to-point in accordance with Table 17120-1 titled "Fiber Optic Cable Distribution System Schedule". This schedule designates the two terminals for the cable and number of fibers within each cable.
B. Table 17120-2 titled "Fiber Optic Cable Assignments" shows the functional assignments for each fiber within the specific cable.
C. All cable shall be continuous between the terminals with no splicing.
D. The loss performance of each fiber terminated connector shall be measured and recorded. The loss shall not exceed the loss as shown in Table 17120-3 titled "Cable Light Loss Schedule".
E. All fiber strands shall be terminated with "ST" type connectors. Interface to fiber optic transceivers and other fiber optic equipment shall be made at the bulkhead connectors utilizing patch cables.
PART 2 - PRODUCTS
2.1 FIBER CABLE
A. All fiber optic cable shall be tight buffered optical cable with a color coded UV cured acrylate buffer primary coating. The secondary buffer coating shall consist of tight buffer high performance PVC. Each optical cable shall contain rod fillers and synthetic yarn for strength and rigidity. The rod fillers shall consist of a central dielectric strength member surrounded by an extruded elastic polymer coating. The synthetic yarn shall be individually tensioned and held helically over the cable core.
1. All of the fiber optic cable shall conform to the following specifications as a minimum:
a. Primary Coating: 250 +/- 15 microns
b. Secondary Coating: 900 microns
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-4
c. Minimum Bend Radius During Installation: 20 X Cable O.D.
Long Term: 10 X Cable O.D.
d. Operating Temperature: -40°C to +85°C
e. Storage Temperature: -55°C to +85Ec
f. Crush Resistance: 1,800 N/cm
g. Proof Test: 100 kpsi (Minimum)
h. Tensile Strength:
(Minimum)
Fiber Count During Installation Long Term 6 fiber or less 1600 N 500 N 8 fiber 1800 N 525 N 10 to 12 fiber 2100 N 700 N 14 to 18 fiber 2700 N 1000 N 20 to 24 fiber 3000 N 1000 N 24 and greater 3000 N 1000 N
2. All of the multi-mode fiber strands shall conform to the following specifications as a minimum:
a. Fiber Type: Multimode, Graded Index
b. Core Diameter: 62.5 microns
c. Cladding Diameter: 125 microns
d. Maximum Attenuation @ 850 nm: 3.0 dB/km @ 1300 nm: 1.0 dB/km
e. Minimum Bandwidth @ 850 nm: 300 MHz-km @ 1300 nm: 800 MHz-km
3. All of the single mode fiber strands shall conform to the following
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-5
specifications as a minimum:
a. Fiber Type: Single-Mode
b. Core Diameter: 9 microns
c. Cladding Diameter: 125 microns
d. Maximum Attenuation @ 1310 nm: 0.4 dB/km @ 1550 nm: 0.3 dB/km
B. OUTDOOR CABLES (FCI, USP only)
1. The outer jacket shall consist of PVC having a wall thickness of 1 mm and a minimum wall thickness of 0.75 mm at any point. (FCI, USP only)
2. The cables shall be rated for buried exterior use and shall meet the requirements of TIA/EIA-455-82B. (FCI, USP only)
3. The cables outside diameter shall be:
48 fibers or less less than 10.5mm 49 to 84 fibers less than 13.0mm (FCI, USP only)
4. Cable shall be Optical Cable DX series or approved equal. (FCI, USP only)
C. INTERIOR RISER CABLES
1. The outer jacket shall consist of flame-retardant PVC (OFNR rated) having a wall thickness of 1 mm and a minimum wall thickness of 0.75 mm at any point.
2.
The fiber optic cable shall be UL-listed riser-rated OFNR and shall meet
NEC sections 770-51(b) and 770-53(b) for use in vertical runs in building riser shafts or from floor to floor.
3. Cable shall be Optical Cable DX series or approved equal.
D. HORIZONTAL DISTRIBUTION AND BREAKOUT CABLES
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-6
1. The outer jacket shall consist of flame-retardant PVC (OFNR rated) having a wall thickness of 1 mm and a minimum wall thickness of 0.75 mm at any point.
2. The cables outer jacket and cable core shall be designed for installation survivability.
3. The cables shall be suitable for indoor and outdoor use.
4. The cables fiber strands shall be designed for direct termination with standard connectors.
5. Cable shall be Optical Cable BX series or approved equal.
2.2 PATCH CABLES
A. Flexible jumpers and patch cords utilized to extend optic signals from the LCT to the fiber optic transceivers and equipment. Cables shall be cut to length and factory terminated utilizing terminations compatible with the specified equipment. Cable shall be simplex or duplex zipcord type as required and shall include a high-performance tight-buffer coating on each optical fiber. Cable jacket shall be a flame-retardant flexible PVC that is OFNR rated and color coded per TIA-598-A.
B. Patch cables shall conform to the following specifications as a minimum:
1. Attenuation: 0.2 dB typical
2. Bandwidth: 160 MHz/km @ 850 nm 500 MHz/km @ 1300 nm
3. Cladding Diameter: 125 microns
4. Core Diameter: 62.5 microns
5. Fiber Type: Multi-mode
6. Insertion Loss: 0.3 dB typical, 0.5 dB max
7. Minimum Bend Radius: 5 cm
2.3 MISCELLANEOUS
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-7
A. Connectors shall be "ST" type with ceramic ferrules. Connector characteristics shall be compatible with cable characteristics listed in this section.
B. Light Cable Terminals (LCT) shall be configured for termination of fiber optic cable with the use of bulk head "ST" terminations. The main equipment room LCT shall be 19 inch rack mounted. In the remote equipment rooms, the LCT's shall be either wall mounted and equipped with a lock keyed like the SCC cabinets, or rack mounted in the SCC cabinets. Each LCT's shall be equipped for the intended cable quantities.
C. All fiber optic cable located in the exterior ductbank shall be installed in innerduct. Innerduct shall be Pyramid polyethylene Innerduct, SDR-11 series as manufactured by Pyramid, Endot, or another product approved by the Contracting Officer. (FCI, USP only)
PART 3 - EXECUTION
3.1 INSTALLATION
A. All fiber optic cable shall be inspected prior to installation.
B. All cable shall be factory tested on a reel basis for each cable supplied to the Government.
1. The attenuation in dB/km units shall be recorded for each fiber. Tests shall be conducted at 850 nm and 1300 nm for multimode fiber and at 1310 nm and 1550 nm for single-mode fiber.
2. Bandwidth shall be recorded for each multi-mode fiber.
C. Cable shall be installed in accordance with the fiber optic TIA/EIA 568-B standards and with the manufacturer's recommended practices for field installation.
D. Patch cords shall be installed as shown on the drawings to interconnect fibers at the main LCT.
E. Each LCT port that is used to terminate a strand of fiber shall be labeled with a nomenclature that indicates the location from which the fiber strand originated.
The nomenclature shall include the originating LCT name, as indicated in the Tables, and port number where the strand originated. Where fusion splices are
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-8
required as indicated in the Contract Documents they shall not be included in the nomenclature scheme.
F. At the fiber cable bundle entrance of each LCT, the cable sheath shall be labeled with a nomenclature that indicates the fiber cable bundle originating SCC. The nomenclature shall indicate the name of the originating SCC and the number of fiber strands included in the fiber cable bundle.
G. At the fiber cable bundle entrance of each LCT, the cable sheath shall be labeled with a nomenclature indicating intended use. Nomenclature shall be from the Legend of the Fiber Optic Cable Fiber Assignment table. Examples of such nomenclature would be: Sentry LAN, Commissary LAN, etc.
3.2 COMPLETION
A. General: Upon completion of the work, remove excess debris, materials, equipment, apparatus, tools and the like and leave the premises clean, neat and orderly.
B. Testing: The completed system shall be tested by the Contractor prior to the acceptance test.
1. Each installed fiber cable, including the cable for the perimeter system, shall be tested for power through loss to reflect the following: (FCI, USP only)
2. Each installed fiber cable shall be tested for power through loss to reflect the following: (FDC only)
a. Total end-to-end loss including connectors.
b. All tests shall be based at 850 nm and 1300 nm for multimode fiber and at 1310 nm and 1550 nm for single-mode fiber.
1) The horizontal fiber optic cable installed between the equipment closet and the workstation may be tested at a single wavelength.
c. End-to-end loss shall be measured from bulkhead-to-bulkhead to include cable splice jumper and connector losses. Loss for the multi-mode cables shall not exceed 3.5 dB/km at 850 nm and 1.5 dB/km at 1300nm. Loss for the single-mode cables shall not
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-9
exceed 0.5 dB/km at 1310 nm and 0.5 dB/km at 1550 nm. Cable loss measurements shall be made in conformance with the fiber optic TIA/EIA 568-B standards and with the cable manufacturer's recommendations. Measurements shall be recorded on a per cable basis with loss measured for each strand.
3.3 TABLES:
A. Installation shall conform to the following tables:
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-10
FIBER OPTIC CABLE
DISTRIBUTION SYSTEM SCHEDULE
TABLE 17120-1 USP
CABLE TERMINAL TERMINAL
DESIGNATION "A" "B"
GT1 LCT-AO LCT-GT1
GT2 LCT-AO LCT-GT2
GT3 LCT-AO LCT-GT3
GT4 LCT-AO LCT-GT4
GT5 LCT-AO LCT-GT5
GT6 LCT-AO LCT-GT6
GT7 LCT-AO LCT-GT7
SG LCT-GT1 LCT-SG
AO2 LCT-AO LCT-COM-AO
H1 LCT-AO LCT-H1
H2 LCT-AO LCT-H2
H3 LCT-AO LCT-H3
H4 LCT-AO LCT-H4
H5 LCT-AO LCT-H5
H6 LCT-AO LCT-H6
RE LCT-AO LCT-RE
EM LCT-AO LCT-EM
SH LCT-AO LCT-SH
AI LCT-AO LCT-AI
MS LCT-AO LCT-MS
UF LCT-AO LCT-UF
UF1 LCT-UF LCT-UF1
UP LCT-AO LCT-UP
MW LCT-AO LCT-MW
MW1 LCT-MW LCT-MW1
CH LCT-AO LCT-CH
CC LCT-AO LCT-CC
LG LCT-AO LCT-LG
NOTES:
1) None.
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-11
LEGEND
CCTV - Closed Circuit Television
FUTURE CCTV - Fiber for cameras furnished and installed by the Owner
PLC - Programmable Logic Controller
TL - TRULINCS; UNICOR - UNICOR LAN
ITS - Inmate Telephone Monitoring System
RADIO - Fiber for Government Furnished Trunked Radio System
TWR - Guard Tower Special System
MIN SPR - Minimum Spare Fiber Optic Cable.
SGL MODE – Single Mode Fiber Strands provided for Government Future Use. (Unless noted otherwise all other fiber strands shall be multimode.)
CABLE S-LAN C-LAN CCTV
FUTURE
CCTV
PLC TL UNI
COR
ITS RADIO TWR
MIN
SPR
SGL
MODE
MIN
TOTAL
GT1 4 0 7 0 4 0 0 4 0 2 11 8 40
GT2 0 0 0 0 4 0 0 4 0 2 10 4 24
GT3 0 0 2 0 4 0 0 4 0 2 10 4 26
GT4 0 0 0 0 4 0 0 4 0 2 10 4 24
GT5 0 0 0 0 4 0 0 4 0 2 10 4 24
GT6 0 0 0 0 4 0 0 4 0 2 10 4 24
GT7 0 0 17 0 4 0 0 4 0 2 11 4 42
SG 4 0 0 0 0 0 0 0 0 0 10 4 18
A0 0 6 0 0 0 4 0 28 0 0 10 0 48 * H1 4 0 22 0 4 4 0 0 0 0 10 12 56 * H2 4 0 26 0 4 4 0 0 0 0 10 12 60 * H3 4 0 22 0 4 4 0 0 0 0 10 12 56 * H4 4 0 22 0 4 4 0 0 0 0 10 12 56 * H5 4 0 26 0 4 4 0 0 0 0 10 12 60 * H6 4 0 22 0 4 4 0 0 0 0 10 12 56 *
RE 4 0 22 0 4 0 0 0 0 0 10 12 52
EM 4 0 33 0 4 4 0 0 0 0 11 12 68 *
SH 4 0 45 0 4 4 0 0 0 0 11 12 80 *
AI 4 0 26 0 4 0 0 0 0 0 10 12 56
MS 4 2 32 0 4 0 0 0 0 0 10 12 64
UF 4 0 12 8 4 0 16 0 0 0 10 12 66
UF1 0 0 0 0 0 0 16 0 0 0 10 0 26
UP 4 0 0 0 4 0 0 0 26 0 10 12 56
MW 4 2 0 0 4 0 8 0 0 0 10 12 40
MW1 0 0 0 0 0 0 8 0 0 0 10 0 18
CH 4 0 0 0 4 4 0 0 0 0 10 12 34 *
CC 4 2 0 0 4 4 0 0 0 0 10 12 36 *
LG 4 0 0 0 4 0 0 0 0 0 10 12 30
FIBER OPTIC CABLE FIBER ASSIGNMENTS
TABLE 17120-2 USP
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-12
CABLE LIGHT LOSS SCHEDULE
TABLE 17120-3 USP
CABLE CABLE LOSS CONNECTOR
MAXIMUM LOSS
DESIGNATION at 850nm (dB) LOSS (dB) at 850nm (dB)
REMARKS
GT1
1.50 1 2.50
GT2 0.64 1 1.64
GT3 0.79 1 1.79
GT4 1.65 1 2.65
GT5 2.70 1 3.70
GT6 2.10 1 3.10
GT7 1.65 1 2.65
SG 0.38 1 1.38
SG-GT1-AO 1.88 1.25 3.13 3
AO2 0.19 1 1.19
H1 0.45 1 1.45
H2 1.32 1 2.32
H3 1.32 1 2.32
H4 2.10 1 3.10
H5 2.76 1 3.76
H6 2.50 1 3.50
RE 2.21 1 3.21
EM 2.21 1 3.21
SH 1.28 1 2.28
AI 0.41 1 1.41
MS 1.24 1 2.24
MS-AO-COM 1.42 1.25 2.67 1
UF 1.80 1 2.80
UF1 0.19 1 1.19
UF1-UF-AO 2.00 1.25 3.25 2
UF1-UF-AO-MW-MW1 4.70 1.75 6.45 2
UP 1.50 1 2.50
MW 2.48 1 3.48
MW1 0.19 1 1.19
CH 3.19 1 4.19
CC 3.19 1 4.19
CC-AO-COM 3.40 1.25 4.65 1
LG 2.68 1 3.68
REMARKS:
1.
See Commissary LAN Network Functional Diagram.
2. See UNICOR data circuits Function Diagram
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-13
3. See Sentry LAN Network Function Diagram
FIBER OPTIC CABLE
DISTRIBUTION SYSTEM SCHEDULE
TABLE 17120-1 FCI
CABLE TERMINAL TERMINAL
DESIGNATION "A" "B"
AO2 LCT-AO LCT-COM-AO
H1 LCT-AO LCT-H1
H2 LCT-AO LCT-H2
H3 LCT-AO LCT-H3
AI LCT-AO LCT-AI
HS LCT-AO LCT-HS
SH LCT-AO LCT-SH
FS LCT-AO LCT-FS
PS LCT-AO LCT-PS
UF LCT-AO LCT-UF
UF1 LCT-UF LCT-UF1
EM LCT-AO LCT-EM
SG LCT-AO LCT-SG
UP LCT-AO LCT-UP
MW LCT-AO LCT-MW
MW1 LCT-MW LCT-MW1
LG LCT-AO LCT-LG
CC LCT-AO LCT-CC
CH LCT-AO LCT-CH
NOTES:
1) None.
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-14
FIBER OPTIC CABLE FIBER ASSIGNMENTS
TABLE 17120-2 FCI
FUTURE MIN SGL MIN
CABLE S-LAN C-LAN CCTV CCTV PLC UNICOR ITS RADIO TL SPR MODE TOTAL
AO
0 8 0 0 0 0 0 0 4 10 0 22 * *
H1 4 0 32 0 4 0 0 0 4 10 12 66 * * H2 4 0 32 0 4 0 0 0 4 10 12 66 * * H3 4 0 32 0 4 0 0 0 4 10 12 66 * *
AI 4 0 16 0 4 0 0 0 0 10 12 46
HS 4 2 4 0 4 0 0 0 0 10 12 36
SH 4 0 22 0 4 0 0 0 4 10 12 56 * *
FS 4 0 18 0 4 0 0 0 0 10 12 48
PS 4 2 2 0 4 0 0 0 0 10 12 34
UF 4 0 2 8 4 16 0 0 0 10 12 56
UF1 0 0 0 0 0 16 0 0 0 10 0 26
EM 4 0 12 0 4 0 0 0 4 10 12 46 * *
SG 4 0 4 0 4 0 0 0 0 10 12 34
UP 4 0 0 0 4 0 0 26 0 10 12 56
MW 4 2 0 0 4 8 0 0 0 10 12 40
MW1 0 0 0 0 0 8 0 0 0 10 0 18
CH 4 0 0 0 4 0 0 0 4 10 12 34 * *
CC 4 2 0 0 4 0 0 0 4 10 12 36 * *
LG 4 0 0 0 4 0 0 0 0 10 12 30
LEGEND:
S-LAN - Sentry LAN
C-LAN - Commissary LAN
CCTV - Closed Circuit Television
FUTURE CCTV - Fiber for cameras furnished and installed by the Owner
PLC - Programmable Logic Controller
UNICOR - UNICOR LAN
ITS - Inmate Telephone Monitoring System
RADIO - Fiber for Government Furnished Trunked Radio System
TL - TRULINCS
MIN SPR - Minimum Spare Fiber Optic Cable.
SGL MODE - Single Mode Fiber Strands provided for Government Future Use. (Unless noted otherwise all other fiber strands shall be multi-mode)
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-15
CABLE LIGHT LOSS SCHEDULE
TABLE 17120-3 FCI
CABLE CABLE LOSS CONNECTOR
MAXIMUM LOSS
DESIGNATION at 850nm (dB) LOSS (dB) at 850nm (dB) REMARKS
AO2
0.19 1 1.19
H1 2.51 1 3.51
H2 1.99 1 2.99
H3 1.50 1 2.50
AI 0.41 1 1.41
HS 0.56 1 1.56
HS-AO-COM 0.76 1.25 2.01 1
SH 1.09 1 2.09
FS 1.88 1 2.88
PS 1.91 1 2.91
PS-AO-COM 2.11 1.25 3.36 1
UF 0.94 1 1.94
UF1 0.19 1 1.19
UF1-UF-AO 1.14 1.25 2.39 2
UF1-UF-AO-MW-MW1 3.74 1.75 5.49 2
EM 0.68 1 1.68
SG 1.61 1 2.61
UP 2.96 1 3.96
MW 2.40 1 3.40
MW1 0.19 1 1.19
LG 3.49 1 4.49
CC 3.49 1 4.49
CC-AO-COM 3.69 1.25 4.94 1
CH 3.49 1 4.49
REMARKS:
1.
See Commissary LAN Network Functional Diagram.
2. See UNICOR data circuits Function Diagram
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-16
FIBER OPTIC CABLE
DISTRIBUTION SYSTEM SCHEDULE
TABLE 17120-1 FDC
CABLE TERMINAL TERMINAL
DESIGNATION "A" "B"
FDC TABLES ARE SIMILAR BUT DIFFERENT TO THE
USP AND FCI TABLES. REVIEW TABLES CAREFULLY
WITH FBOP PRIOR TO DEVELOPING FOR
CONSTRUCTION DOCUMENTS.
LEGEND
LCT - LIGHT CABLE TERMINAL
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-17
FIBER OPTIC CABLE FIBER ASSIGNMENTS
TABLE 17120-2 FDC
MIN MIN
CABLE S-LAN C-LAN SPARES TOTAL
FDC TABLES ARE SIMILAR BUT DIFFERENT TO THE
USP AND FCI TABLES. REVIEW TABLES CAREFULLY
WITH FBOP PRIOR TO DEVELOPING FOR
CONSTRUCTION DOCUMENTS.
LEGEND:
S-LAN - Sentry LAN C-LAN - Commissary LAN
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-18
CABLE LIGHT LOSS SCHEDULE
TABLE 17120-3 FDC
CABLE CABLE CONNECTOR MAXIMUM
DESIGNATION LOSS (dB) LOSS (dB) LOSS (dB)
FDC TABLES ARE SIMILAR BUT DIFFERENT TO THE
USP AND FCI TABLES. REVIEW TABLES CAREFULLY
WITH FBOP PRIOR TO DEVELOPING FOR
CONSTRUCTION DOCUMENTS.
Note: Loss measured at 850 nm wavelength.
FIBER OPTIC CABLE DISTRIBUTION SYSTEM 17120-19
3.4
COMPLETION
A. Upon completion of the work, remove excess debris, materials, equipment, apparatus, tools and the like and leave the premises clean, neat and orderly.
END OF SECTION 17120
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