MIL-PRF-29504/4D
Inspections of termini in a multiple termini connector:
Test sample configuration: Four test samples (mated connector assemblies) shall be used for group
I inspections except for interoperability. Two of these four mated connector assemblies shall be
used for group II inspections and two for group III inspections. Each mated connector assembly
shall be comprised of a cable assembly with termini placed into MIL-DTL-38999 shell size 17, series
III connectors. These termini/connectors are located in the middle of the cable assembly. Termini,
selected from the group that passed inspections for un-terminated termini, shall be used and
inserted into MIL-DTL-38999 shell size 17, series III connector as part of the cable assembly that
comprises each test sample. Cable assembly length shall be 10 meters with the connector mated
pair inserted 5 meters from the cable ends. Cable length may be longer (with added cable at the
optical source end) if cut-backs are performed to verify insertion loss. Each connector shall be fully
populated with termini. At least 8 randomly selected termini pairs in each cable assembly shall be
monitored for optical transmittance after and when specified, during environmental and mechanical
testing. Insertion loss shall be performed on all termini pairs in each cable assembly. Connectors
used in the cable assembly, both the plug and receptacle types, are to include backshells. Selection
of the backshell is to include assurance of proper strain relief for each single fiber cable and not
cause degradation in optical performance. Test sample configurations, fabrication methods and the
specific test methods and practices shall be as specified in NAVSEA Drawing 8283255.
Interoperability. Applicable, except test for terminus insertion and removal forces is not required.
Testing shall be performed using two separately designated cable assemblies with fully populated,
MIL-DTL-38999, series III, shell size 17 connectors. Test performance and test sample
configurations/fabrication shall conform to NAVSEA Drawing 8283255. As part of the interoperability
inspection, terminus on the end of single fiber cable, shall be inserted and removed from the
connector to verify that the strain relief is compatible with the tools listed in table II. At the discretion
of the preparing activity, selected configurations may be specified to undergo inspections for shock,
vibration and mating durability. Interoperability is applicable only for termini among vendors with the
same TICC (fiber size, ferrule hole diameter, and ferrule material (see table I)) with one addition.
Termini shall be interoperable regardless of the style. All termini of the same PIN shall be
interoperable with one exception. Terminus shall be interoperable regardless of the style.
Qualification by similarity will be given to a terminus in the same row in table I as the terminus tested
for interoperability. This qualification by similarity is valid if the only difference between the terminus
tested for interoperability and the terminus configuration in the same row in table I is a different cable
strain relief capture mechanism and TICC markings.
Optical source wavelength. Termini with single mode fiber shall be tested using an optical source at
the 1,310 nm wavelength. Termini with multimode fiber can be tested using an optical source at
either the 850 nm or the 1,300 nm wavelength.
Launch conditions shall conform to NAVSEA Drawing 8283255.
Insertion loss. The initial insertion loss and the insertion loss verification for the various fiber sizes
and ferrule materials shall be as specified in table IV. The insertion loss limits specified are the
maximum allowed values for each measurement (each mating with respect to the pre-cut back
measurement). It is not intended to average the ten matings or use other averaging schemes.
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