[c-nsp] Upgrading to 40G

Charles Spurgeon c.spurgeon at austin.utexas.edu
Fri Feb 28 16:38:07 EST 2014

On Fri, Feb 28, 2014 at 04:31:54PM +0100, Benny Amorsen wrote:
> Mikael Abrahamsson <swmike at swm.pp.se> writes:
> > When 40GE and 100GE was standardized it was taken for granted that
> > 40GE would be used to connect servers and perhaps a little
> > inter-building backhaul, because of that only up to 10km was
> > standardized.
> Just in case any vendors read this list:
> There is a market for 40km 40G optics! Even non-standard.

The IEEE has a task force that is defining the specs for long distance
40 Gb/s, "40GBASE-ER4"

5.2.b. Scope of the project: This project is to specify
additions to and appropriate modifications of IEEE Std 802.3 to
add 100 Gb/s Physical Layer (PHY) specifications and
management parameters, using a four-lane electrical interface
for operation on multimode and single-mode fiber optic cables,
and to specify optional Energy Efficient Ethernet (EEE) for 40
Gb/s and 100Gb/s operation over fiber optic cables. In addition,
to add 40 Gb/s Physical Layer (PHY) specifications and
management parameters for operation on extended reach (>
10 km) single-mode fiber optic cables.

Looks like Finisar has a transceiver under development:


Charles E. Spurgeon
University of Texas at Austin / ITS Networking
c.spurgeon at its.utexas.edu / 512.475.9265

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