MIL-DTL-83522E
3.5.1.4 Signal discontinuities. When measured in accordance with 4.7.9, no discontinuity shall occur. A discontinuity is
considered to be a reduction of optical transmittance of 0.5 dB or more for a duration of 50 microseconds or more.
3.5.1.5 Return loss (type II). The minimum return loss shall be 30 dB per mated pair, or as specified see 3.1.
3.5.2 Mechanical requirements. All connector assemblies specified herein and in the appropriate specification sheet (see 3.1)
shall satisfy the mechanical requirements as specified herein.
3.5.2.1 Cable retention (see 4.7.11). The connector plug hardware shall have a secure mechanical retention of the cable
strength members where cable has strength members, allowing the cable assembly to withstand the tensile and twist loads as specified
herein. Variations of this mechanism to accommodate various cable configurations shall be identified in the specification sheets (see
3.1).
3.5.2.1.1 Tensile loading When tested as specified in 4.7.11.1, the connector plug (receptacle and adapter exempt) shall be
capable of sustaining a static tensile load of at least 180 N (40 lb) applied to the cable behind the back end of the plug without evidence
of physical damage to the connector of fiber optic cable. The optical performance of the connector shall remain within the limits
specified in 3.5.1.2.
3.5.2.1.2 Cable strain relief. The design of the connector shall include a strain relief. When tested as specified in 4.7.11.2,
the connector plug shall show no evidence of physical damage.
3.5.2.1.3 Flex life. When tested as specified in 4.7.11.3, the connector plug (receptacle and adapter exempt) shall show no
evidence of physical damage and the optical performance of the connector shall remain within the limits specified in 3.5.1.2 during the
test.
3.5.2.1.4 Twist. When tested as specified in 4.7.11.4, the connector plug shall show no evidence of physical damage and
the optical performance of the connector shall remain within the limits specified in 3.5.1.2 after the test.
3.5.2.2 Force to engage/disengage. When tested as specified in 4.7.12, the torque necessary to completely couple or
uncouple the connectors shall not exceed that specified (see 3.1). Also the longitudinal force necessary to initiate the engaging or
disengaging cycle shall not exceed that specified (see 3.1).
3.5.2.3 Coupling proof tongue. When tested as specified in 4.7.13, the coupling mechanism (plug only) (threaded types) shall
not be dislodged. The interface dimensions of the connector shall remain as specified (see 3.1).
3.5.2.4 Coupling mechanism retention force. When tested as specified in 4.7.14, the coupling mechanism (plug only) shall
not be dislodged from the connector.
3.5.2.5 Engagement of connectors.
3.5.2.5.1 Mating durability. When tested as specified in 4.7.15, the connectors shall be capable of withstanding 500 mating
cycles, unless otherwise specified (see 3.1), without evidence of mechanical damage or physical deterioration. The optical
performance of the connectors shall remain within the limits specified in 3.5.1.2 after each 100 cycles during and after the test and
within the limits specified in 3.5.1.5 after the test. Re-polishing the ferrule end face after the test to meet 3.5.1.5 is allowed. There shall
be no evidence of mechanical damage to the coupling device or physical deterioration of controlling surfaces or component parts.
Minor damages such as scratches or abraded finishes at non-optical surfaces or at surfaces not employed as part of optical contact
guides shall not be cause for rejection.
3.5.2.5.2 Polarization. Connectors shall be keyed when specified (see 3.1). When specified, polarization of connector
shells or connector-to-adapter shells shall be accomplished by means of integral key(s) and suitable matching keyway(s) on the
counterpart (see 4.7.2.4). Polarization shall be accomplished before initial engagement of the coupling ring or other attachment device
(such as bayonet). During axial engagement, mating ferrule end faces shall not touch until polarization has been achieved.
3.5.2.5.3 Interchangeability and intermateability. The connector material and hardware shall be specified
(see 3.1) to ensure interchangeability and intermateability. All connectors, backshells, accessories and replaceable parts having the
same part number shall be physically and functionally interchangeable without need for modification of such items or of the mating
equipment (see 4.7.2.1).
3.5.2.5.4 Safety wires (when specified) (see 3.1). The connectors specified herein shall include the facility to use safety
wires for high vibration environments (see 3.1). Safety wires shall not be required to satisfy the vibration requirements specified in
3.5.2.5.5 Impact. When tested as specified in 4.7.16, connectors shall not be damaged or otherwise rendered unfit for
operational use. The connector shall meet the optical requirements as specified in 3.5.1.2.
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