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)

MQJ1

Cable topology link under test

MQJ

Light source

connectors

Power meter

FIGURE 6E1-6. Test setup (typical). Step 3 - Record the power (in dBm) at the meter (P2).

NOTE: The value obtained for the test power, P2, should be less than the

value obtained for the reference power. A value of the test power

greater than the value of the reference power indicates that either a

defective or dirty MQJ was used for the reference measurement. If a

value for the test power greater than the value of the reference power

is obtained, clean or replace the reference MQJ and repeat Step 2 and

Step 3.

Step 4 - Calculate the FOCT end-to-end attenuation using the following formula and record the results:

BTL = ( P1 - P2 )

Where: BTL = Total FOCT end-to-end attenuation in dB P1 = Reference power in dBm

P2 = Test power in dBm

NOTE: Some optical power meters will automatically calculate the end-to-end attenuation when the meter is referenced or zeroed after the reference power measurement. The reference and test optical powers may be measured and the loss calculated using the formula above or the calculation capability of the optical power meter may be used. In either case, the end-to-end attenuation value should be a positive number and the value of the optical reference power shall be recorded.

NOTE: The cable assembly link loss value should be a positive number.

Step 5 - Repeat steps 1, 2, 3, and 4 for each fiber in the FOCT link.

Step 6 - Identify the connectors/splices by type and proceed to 3.3.2 below.

3.3.2 Calculations

Step 1 - Compare the measured end-to-end attenuation to the specified maximum allowable link loss. If the maximum allowable link loss is not specified, compare the measured end-to-end attenuation to the maximum allowable loss calculated from the maximum component loss values shown in table 6E1-IV using the following formula:

6E1-7

METHOD 6E1