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Dear Mr. Walter,
Thanks for your September presentation. I am very interesting
in BM CDR for the EPON system.
From your presentation, guard time is necessary to upstream
transmitting, and it was strongly dependent on both optical P1(Strong optical
power) and P1/P2(ratio of strong power to weak power, or dynamic range), when
P1/P2<3 dB, guard time can be 0, regardless of P1. But I am afraid that
I can not agree with you.
In my opinion, guard time is not only dependent
on "Dynamic range",but also dependent on "Range Resolution"
. When range resolution is +/- 2 bits, guard time should be at
least 4 bits. Do you think so?
Best regards.
Quinn.Zhao
October 25,2001. PM.
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