Hybrid and Bundled
Cables
As a result of the demand for open office architecture and the need
to support multiple telecommunications applications in a shared
sheath, performance specifications for hybrid cables have been revised.
A new term called "bundled cables" has been introduced
to describe 4-pair cable assemblies that are not covered by an overall
sheath (as specified for hybrid cables), but by any generic binding
method such as "speedwrap" or "cable-ties."
The new hybrid and bundled cable requirements
state that power sum NEXT loss between all non-fiber cable types
within the cable shall be 3 dB better than the specified pair-to-pair
NEXT loss for each cable type. See figure 1.
FIGURE 1:
Pair-to-Pair measurements required to calculate powersum NEXT
loss for pair 1 of a 24-pair hybrid cable.
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