Certifying Fiber Optic Cabling
Essentials for Reliable Fiber Test Results
7-11
7
After you set the reference, you can enter the lengths of
the reference test cords used for reference and test
connections. The lengths are included with saved results to
meet TSB-140 reporting requirements for fiber test results.
Selecting Reference Test Cords
The DTX Fiber Modules come with high-quality reference
test cords.
To ensure that your measurements are accurate and
repeatable, use reference test cords provided by Fluke
Networks or cords of the same quality. See "Replacing Fiber
Reference Test Cords" on page 13-7.
Testing Your Reference Test Cords
You should test your reference test cords before each job.
Use another set of known-good cords to set a reference and
run an Autotest on other cords in Smart Remote or
Loopback mode. See pages 7-18 and 7-26 for details on
running these tests.
Using Mandrels for Testing Multimode Fiber
You should use mandrels when testing multimode fiber
with the DTX-MFM2 fiber modules. Mandrels can improve
measurement repeatability and consistency. They also allow
the use of LED light sources to certify 50 µm and 62.5 µm
fiber links for current and planned high bit-rate
applications, such as Gigabit Ethernet and 10 Gigabit
Ethernet.
WCaution
Do not use mandrels when testing with the
DTX-GFM2 fiber modules.
The gray mandrels included with the DTX-MFM2 are
compliant with TIA/EIA-568-B for 62.5 μm fiber with a
3 mm jacket. Mandrels for 50 μm fiber are available from
Fluke Networks. Refer to the appropriate standard for
mandrel requirements if you follow other standards.
Table 7-1 shows a partial list of mandrel requirements for
TIA and ISO standards.
Figure 7-6 shows how to wrap the fiber around a mandrel.
Place mandrels on the tester’s output fibers, as shown in the
figures for reference and test connections.
In the reference and test connection diagrams shown on
the tester, mandrels are indicated by a loop in the fiber.
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