| Thread Links | Date Links | ||||
|---|---|---|---|---|---|
| Thread Prev | Thread Next | Thread Index | Date Prev | Date Next | Date Index |
|
Pete, Thanks for the loss analysis. Clause 52
says the connection loss allocation for 10GBASE-ER is 2 dB. The maximum link distances for single-mode fiber are
calculated based on an allocation of 2 dB total connection and splice loss at 1310 nm for 10GBASE-L, and 2 dB for 30 km
total connection and splice loss at 1550 nm for
10GBASE-E. Using 1.5 dB would not necessarily ensure
an upgradable channel. Paul From: Anslow, Peter [mailto:panslow@xxxxxxxxx] Hi, As noted in the draft minutes of
yesterday’s SMF Ad Hoc meeting, there were a couple of questions related to the
maximum channel loss: ·
What coverage of
links is the 18 dB loss for 100GBASE-ER4 equivalent to? ·
What loss does
the channel loss for 10GBASE-ER translate to for 40GBASE-ER4 wavelengths? The answer to the first question is that
(18-2)/40 = 0.4 dB/km at 1294.53 nm (lowest wavelength for 100GBASE-ER4) is
equivalent to about 50% of installed links on Figure 10-8 of G.Sup39. The maximum channel insertion loss for
10GBASE-ER from Table 52-24 is 11 dB with 1.5 dB for connectors at 1550
nm. This is (11-1.5)/40 = 0.2375 dB/km This covers about 50% of installed links
on Figure 10-8 of G.Sup39. 0.2375 dB/km at 1550 nm is equivalent to
17.25 dB for a 40km link at 1264.5 nm. If we add 1.5 dB for connectors
(assuming that we are going to upgrade an existing 10GBASE-ER link) we get
18.75 dB which fits well with the proposed 19 dB maximum channel insertion loss
for 40GBASE-ER4. Regards, Pete
Anslow | Senior Standards Advisor |