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

NOTE – The mandrel diameters are based on nominal values of 20 mm and 25 mm reduced by the
cable diameter and rounded up.
A.3.2 Performance parameters
OLTS field tests required for optical fiber cabling are as follows:
• Length
• Polarity
• Attenuation
A.3.3 Cabling test configuration
ANSI/TIA 568-B.1 specifies the use of a one jumper reference as described in ANSI/TIA-14-A for
multimode cabling and ANSI/TIA 526-7 for single-mode cabling. The following subclauses describe
the process for testing multimode fiber cabling with a one jumper reference and the test jumper
connected to the source having five non-overlapping wraps of multimode fiber on a mandrel. The
procedure is also applicable to single-mode cabling, however, the five non-overlapping wraps of
multimode fiber would be replaced with a single 1.2 inch diameter loop of single-mode fiber.
A.3.3.1 Verifying test jumper quality
To verify that the test jumpers are in acceptable condition, first reference the light source to the optical
power meter . Disconnect test jumper (J1) from the power meter (only) and insert a second test jumper
(J2) by connecting it to the power meter and to (J1) with a mating adapter and record the measurement.
Disconnect both ends of J2, interchange the ends, and reconnect it and record the measurement. The
resulting measurements, P verify , should be within the appropriate connector loss specification. For
example, if the connector used is specified at 0.75 dB, the reading on the power meter should be within
0.75 dB of P1.
Table 6. Acceptable mandrel diameters for common multimode cable types (five wraps)
Fiber
Core/Cladding
Size (µm)
900 µm
Buffered
Fiber
(mm)
2.0 mm
Jacketed
Cable
(mm)
2.4 mm
Jacketed
Cable
(mm)
3.0 mm
Jacketed
Cable
(mm)
50/125 25 23 23 22
62.5/125 20 18 18 17
A.3.3.2 Steps to measure the cabling optical loss
The one jumper reference is used to measure the cabling optical loss. The test jumpers shall be 3.3 ft to
16.4 ft in length and shall be verified to ensure they are of acceptable quality. The basic steps taken to
measure and calculate multimode cabling attenuation include:
1) Verifying test jumper quality (once before testing)
2) Setting the reference (once before testing)
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