MIL-STD-2042-6 Fiber Optic Cable Topology Installation Standard Methods For Naval Ships Tests Part 6 Of 7 PartsThis standard practice provides detailed methods for testing optical fiber cable installations.

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MIL-STD-2042-6B(SH)

NOTE:        If the optical light source is stable over the period of time required to measure all of the fibers in the optical fiber cable, steps 2 and 3 do not have to be repeated for each fiber.

Step 8 - For multimode optical fiber cable assemblies, measure the cable assembly link loss in the opposite direction, repeating steps 2, 3, 4,

5, 6, and 7.

Step 9 - Identify the connectors/splices by type and proceed to 3.3.2 below.

3.3.2  Calculations.

NOTE:    If this test is part of an Acceptance Test, proceed to step l below.

If this test is part of a Pre-Installation or Installation Test,

proceed to step 2 below.

Step l - The optical fiber cable assembly is considered satisfactory if the measured loss (in each direction for multimode optical fiber cable assemblies) does not exceed the loss specified by the vendor for the optical fiber cable assembly.  If the measured loss (in each direction for multimode optical fiber cable assemblies) is greater than the vendor specified loss, proceed to step 2 below.

Step 2 - Compare the measured loss (in each direction for multimode optical fiber cable assemblies) to the maximum allowable loss.  The maximum allowable loss is calculated from the maximum component loss values shown in table 6Cl-IV using the following formula:

MAL

=   A ca    L  +

N  co

L co        +

N  s  L s

Where:   MAL= Maximum acceptable loss

Aca   = Maximum attenuation of the cable

L  = Length of the cable

Ns   = Number of splices

Ls   = Maximum loss of a splice

Nco   = Number of connectors

Lco   = Maximum loss of a connector

The optical fiber cable assembly is considered acceptable if the measured loss (in each direction for multimode optical fiber cable assemblies) is equal to or less than the maximum acceptable loss.  If the measured loss (in both direction for multimode optical fiber cable assemblies) is acceptable, proceed to step 4 below. If measured loss (in either direction for multimode optical fiber cable assemblies) is greater than the maximum acceptable loss, proceed to step 3 below.

NOTE:        If the length of the optical fiber cable is not known, a value of zero may be used for the cable length.

NOTE:        The maximum attenuation rate of some MIL-PRF-85045 optical fiber cables is greater than the values identified in table 6Cl-IV.  If the optical fiber cable used has a maximum attenuation rate greater than that shown in table 6Cl-IV, the actual maximum attenuation rate of the optical fiber cable may be used to calculate the MAL.

6Cl-8

METHOD 6Cl