MIL-DTL-55425E
4.7.6 Attenuation. The attenuation of each pair shall be measured on a fifty (50) foot length of cable and
computed to db per mile. The wet readings shall be taken on cable that has been in water at least 96 hours.
Measurements shall be taken at frequencies of 300Hz, 1 kHz and 4 kHz to establish compliance with 3.5.2. If
individual readings do not comply, several samples shall be measured and an average taken. The attenuation shall
be calculated from direct measurements of the parameters R, L, C, and G and using the standard formula for the
attenuation of a two wire transmission line which is as follows:
2
22
2
2 2
2
1/2( (R + ω L )(G + ω C ) + RG - ω LC) db/mile
A = 8.69
Where attenuation is in decibels per mile, 8.69 is a factor to convert nepers to decibels.
R = Resistance in ohms per loop mile of each conductor pair.
L = Inductance in henries per loop mile of each conductor pair.
C = Capacitance in farads per mile.
G = Conductance in mhos per mile.
ω = 2šƒ and ƒ = frequency in hertz.
4.8 Visual and dimensional examination. The telephone cable shall be examined to verify that the characteristics
4.9 Quality conformance inspection.
4.9.1 Materials inspection. All materials to be used in packaging shall be inspected in accordance with the
applicable material specification.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel
need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activities within the Military Service or Defense Agency, or
within the military service's system commands. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature which may be helpful, but is not mandatory).
6.1 Intended use. Cable, Telephone WF-16( )/U is intended for use in loop circuits with automatic electronic
switching.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a. Title, number, and date of this specification.
b. Packaging (see section 5).
c. Marking and shipping of samples.
d. Place of final inspection.
6.3 Definitions.
6.3.1 Unit of product. The unit of product is one continuous length of cable WF-16( ) one (1) mile +2% -0% long
wound on reel DR-5( ). Both ends of the cable on each reel are to be readily accessible.
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