TIA/EIA-455-171-A:2001

$29.25

FOTP-171 Attenuation by Substitution Measurement for Short-Length Multimode Graded-Index and Single Mode Optical Fiber Cable Assemblies

Published By	Publication Date	Number of Pages
TIA	2001	54

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Description

These test methods describe procedures for measuring the attenuation
by substitution of short
length multimode graded index and single-mode optical fiber cable
assemblies. The cable assemblies
have a connector on only one end of the cable (pigtail) or have
connectors on both ends of the
cable (patch cord). The connectors on the patch cord may be identical
or different from each other.

These tests are primarily used for multimode cables of 100 meters or
less in length and for
single-mode cables of any length. These tests primarily evaluate
connector loss since the fiber
loss is usually a small portion of the total loss. For those
assemblies that are long enough for
the fiber loss to be a significant portion of the loss, the fiber loss
will have to be taken into
account when specifying limits for the measured loss.

It is important to emphasize that measurement of the loss of a given
cable assembly during a
factory test will not necessarily be the same as a loss measurement of
the same cable assembly in
actual field use. The actual loss of the cable assembly depends on the
properties of all of the
mating components, the orientation of the components, and the launch
condition of the light as it
enters the connection. In a factory test only the components that are
part of the cable assembly to
be tested are accessible. The connector(s) that will be mated to the
cable assembly in actual field
use are not. Even though factory loss measurements are not necessarily
the same as loss
measurements in actual field use, the concatenation test is presented
here as a suitable
alternative which provides an estimate of average system loss
performance.

NOTE – The results of this test method are not directly comparable
with those of FOTP-34, which is
an interconnection device insertion loss test. This FOTP tests cable
assemblies and FOTP-34 tests a
complete connection (splice, device, connector set, etc.) installed
between two like fibers.

Additional information