[802.3ae_Serial] Questions on additional allowable insertion losses
A question - my
understanding of the values in "additional insertion loss allowed" (for example
in Table 52-10) is that they are determined by the difference between
unallocated margins from their cable plant type and the one with the least
unallocated margin. Is this correct?
That is, if 50
micron 2000 MHz-km has 0.8 dB unallocated margin (and it is the least of all -S
variants), and if 50 micron 500 MHz-km has 1.3 dB unallocated margin, then 50
micron 500 MHz-km can allow up to 0.5 dB (the difference) of addtional insertion
loss.
If this is true,
then I find that the unallocated margin differences change considerably across
the triple-tradeoff curves. For example, the differences become quite small
at longer wavelengths and narrower spectral widths.
Three simple
proposals:
1. Eliminate the row entirely, as the values become quite small in
some cases.
2. Use the
values determined by max center wavelength and most narrow spectral
width.
3. Explain to me how
I am confused by this (preferred option).
Note that unless all
rows are determined by the same spectral conditions, some of these options will
affect how the rows add up to equal the power budget.
Comments?
Tom
Stratos
NW
425/672-8035 x105
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