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)

MAL

= A ca L +

N co

L co +

N s L s

Where: MAL= Maximum acceptable loss

Aca = Maximum attenuation of the cable

L = Total length of the FOCT link

Ns = Number of splices

Ls = Maximum loss of a splice

Nco = Number of connectors

Lco = Maximum loss of a connector

The FOCT link is considered acceptable if the measured end-to-end attenuation is equal to or less than the maximum acceptable loss. If the measured end-to-end attenuation is acceptable, proceed to step 3 below. If measured end-to-end attenuation is greater than the maximum acceptable loss, proceed to step 2 below.

NOTE: If the length of the FOCT link is not known, a value of zero may be used for the FOCT link length.

NOTE: The maximum attenuation rate of some MIL-PRF-85045 optical fiber cables is greater than the values identified in table 6E1-IV. If the optical fiber cable used has a maximum attenuation rate greater than that shown in table 6E1-IV, the actual maximum attenuation rate of the optical fiber cable may be used to calculate the MAL.

TABLE 6E1-IV. Maximum component loss values.

Component

Single mode

Multimode

Cable

1.5 dB/km @ 1300 nm

1.5 dB/km @ 1550 nm

4.5 dB/km @ 850 nm

2.0 dB/km @ 1300 nm

Single terminus (light duty) connectors (mated pair)

0.75 dB

Multiple terminus (heavy duty) connectors (mated pair)

0.75 dB

COTS connectors (mated pair)

0.75 dB

Mechanical splice

0.2 dB tuned

0.6 dB untuned

0.2 dB tuned

0.6 dB untuned

NOTE: If components other than those listed in table 6E1-IV are used, the loss value of these components must be included in the maximum acceptable loss. If the loss value for a component is not known, contact the Naval Surface Warfare Center (see 1.1.1) for assistance in determining the appropriate loss value.

Step 2 - If the measured end-to-end attenuation is 1.0 dB or more above the maximum acceptable loss, reject the FOCT link. If the measured end- to-end attenuation is less than 1.0 dB above the maximum acceptable

6E1-8

METHOD 6E1