Programming Documents for Pre-K for SA - The City of San Antonio

11.4 Fiber Termination
In telecommunications, there are two specific types of optical fiber used: multimode and single-mode.
Each specific type of fiber has its own characteristics. Multimode optical fiber has an outside diameter
of 125 μm. The glass core of the fiber, which carries the optical signal, has a diameter of 50 μm or 62.5
μm. Single mode optical fiber has an outside diameter of 125 μm. The glass core of the fiber, which
carries the optical signal, has a diameter of 8-9 μm. The optical fibers within cables are color coded as
shown in Table 5. The City Of San Antonio standard for multimode optical fiber cable is 62.5/125 μm
or unless otherwise identified by the City..
Optical fiber cores shall be precisely aligned between connecting cables to ensure that the maximum
transfer of light energy is obtained. Termination procedures for optical connectors in the field vary by
manufacturer. Listed below are some of the various methods:
• Heat-cured termination: A fiber connector termination method requiring field polishing using an
adhesive that requires heat for curing.
• Crimp termination: A fiber connector termination method requiring field polishing using a
mechanical means to secure the fiber.
• Anaerobic termination: A fiber connector termination method requiring field polishing using an
adhesive and catalyst that cures very quickly.
• Pre-polished connectors: A fiber connector termination method using mechanical means to hold the
fiber against a preinstalled and factory polished fiber sub in the ferrule of the connector.
The City Of San Antonio standard for optical fiber termination is fusion spliced cable assemblies
(pigtails). See section 8.6.
Warning:
1) Care should be used when handling fibers so as not to break them, or to handle them in such a way
that they could penetrate your skin. Safely dispose of fiber shards per the City’s practice.
2) Never look into the ends of an optical fiber as the transmitted light may be invisible and cause
eye damage.
Table 5. Optical fiber color code chart (ANSI/TIA-598-C)
Fiber Color Fiber Color Fiber
Color
No.
No.
No.
1 Blue 13 Blue/Black Tracer 25 Blue/Double Black Tracer
2 Orange 14 Orange/Black Tracer 26 Orange/Double Black Tracer
3 Green 15 Green/Black Tracer 27 Green/Double Black Tracer
4 Brown 16 Brown/Black Tracer 28 Brown/Double Black Tracer
5 Slate 17 Slate/Black Tracer 29 Slate/Double Black Tracer
6 White 18 White/Black Tracer 30 White/Double Black Tracer
7 Red 19 Red/Black Tracer 31 Red/Double Black Tracer
8 Black 20 Black/Yellow Tracer 32 Black/Double Yellow Tracer
9 Yellow 21 Yellow/Black Tracer 33 Yellow/Double Black Tracer
10 Violet 22 Violet/ Black Tracer 34 Violet/Double Black Tracer
11 Rose 23 Rose/Black Tracer 35 Rose/Double Black Tracer
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