[802.3_100GNGOPTX] Reach on MMF
Hi
It great to get some end users feedback on MMF reach, as you know 40Gbase-SR4 has reach of
-100 m on OM3
- 150 m on OM4
Single mode PMD is also with in the scope of 100GNGOPTX study group, when the days come that
single mode PMDs are low cost, power, and size then I expect MMF ribbon reach could get limited to
10's meters. I have my finger crossed for that day!
Now with reality and unknown in front of us if the ultimate PMD could be developed, what should the reach of
100Gbase-SR4 be?
Historically single mode PMDs have been larger, higher power, and higher cost. For example 100GBase-SR10
is supported in the CXP form factor and 100Gbase-LR4 is supported in the CFP form factor, the CFI presentation slide 11
http://www.ieee802.org/3/100GNGOPTX/public/jul11/CFI_01_0711.pdf
shows 32 ports of CXP and only 4 ports of CFP! So for some period of time we could find ourself that
the MMF PMD is the only option on the highest density platform. This is why we need to carefully
study this subject specially with in the context of larger data centers see slide 7
http://www.ieee802.org/3/100GNGOPTX/public/sept11/ghiasi_01_a_0911_NG100GOPTX.pdf
Thanks,
Ali