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Steve,
The reach objective of 40km also inherently included meeting the
5 criteria of the PAR, one of those criteria being Economic Feasibility.
Although there are 10G optics that can go 600+ km without electrical
regeneration, they are in a significantly higher cost category.
Note also that the standard in no way limits any offering of a PMD to
the reach objectives. Just like there are 1GE systems running a lot
further than 5 km.
There are only serial PMDs defined for the WAN PHY, 10GBase-LW and
EW.
...Dave
David W. Martin
Nortel Networks
+1 613 765-2901
+1 613 765-0769 (fax)
dwmartin@xxxxxxxxxxxxxxxxxx
=======================
-----Original Message-----
From: Steve King [mailto:steve2100_2000@xxxxxxxxx]
Sent: Friday, November 30, 2001 2:14 PM
To: stds-802-3-hssg@xxxxxxxx
Subject: [802.3ae] WAN distance
Hi,
In WAN PHY , it states that the max distance is 40km.
But now the optical signal can be transmitted over
600km with O/E/O? why limit to 40km?
Is 10GBAse-LW4 still defined?
thanks
Steve
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