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 2: Use the ST to ST MQJ with a hybrid adapter (for example, an ST to SC adapter) to connect to optical fiber cable ends terminated with connectors other than the ST and the MIL-C-28876.

NOTE 3: For COTS connectors that cannot be mated to an ST to ST MQJ using a hybrid adapter, a non-standard MQJ may be used.

MQJ

Cable under test

OTDR

FIGURE 6Bl-2. Test setup.

Step l0 -Enter the required parameters in accordance with the OTDR

manufacturer's instructions.

Step ll -Adjust and place the cursor at the beginning (zl) and the end (z2) of the trace for the optical fiber cable under test (see figure 6Bl-3). Record the optical fiber cable length (z2 - zl) and confirm that the measured length matches the length of the optical fiber cable under test.

Optical power (dB)

Z3 Z2

Zl Z4

Distance (Km)

FIGURE 6Bl-3. OTDR Display - (typical).

Step l2 -Adjust and place the cursor at the beginning (z3) and end (z4) of the linear portion of the trace for the optical fiber cable under test (see figure 6Bl-3). Record the optical fiber cable attenuation in dB. The OTDR may automatically calculate the optical fiber cable attenuation. If it does not, calculate the attenuation (B) in dB/km using the following equation:

6Bl-6

METHOD 6Bl