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[8023-10GEPON] As for the Class B+ of ITU-T

Dear 10G-EPON members,

This is Tsutomu TATSUTA from NTT.
As I promised in Dallas meeting, I checked a reason why Class B+ of ITU-T 
was 28dB.

Class B+ loss is derived from Class B loss and WDM losses.
WDM losses are estimated at 3dB (2 WDM couplers are settled in the both 
side of ODN).
So,
28dB (Class B+ loss) = 25dB (Class B loss) + 3dB (WDM coupler loss).

Sincerely yours,
Tsutomu TATSUTA