Thread Links Date Links
Thread Prev Thread Next Thread Index Date Prev Date Next Date Index

Why I think a variable date rate PHY is important for LAN or WAN

I would like to echo Bruce Tolley's comment that the traditional LAN market
is important as the WAN market.

This is why I think we need a variable data rate PHY ( yes I know this may
be real hard with  PLL).  But maybe we can user interchangable PHY devices
like GBIC connectors.

The problem is that just like in the WAN, there will be a huge installed
base of existing fiber.  A lot of this fiber may not support 10GbE at the
targeted distances, but it may work  very well at speeds of 2GbE, 4GbE,
8GbE, etc

As lasers are the single biggest cost, partularly in the WAN, lower data
rates will allow us to operate our networks at greater distances.  As
bandwidth demand grows users can have a smooth upgrade path by either
increasing laser power, or installing boosters (1R) and or repeaters (3R) or
ultimately installing new fiber


Bill St. Arnaud
Senior Director Network Projects
+1 613 785-0426

Bill St. Arnaud
Senior Director Network Projects
+1 613 785-0426

> -----Original Message-----
> From: owner-stds-802-3-hssg@xxxxxxxxxxxxxxxxxx
> [mailto:owner-stds-802-3-hssg@xxxxxxxxxxxxxxxxxx]On Behalf Of
> Bruce_Tolley@xxxxxxxx
> Sent: September 16, 1999 8:18 AM
> To: Young, Leonard G
> Cc: 'HSSG'
> Subject: RE: York plans
> Leonard:
> We cannot roll out 10 GbE in 2 or 3 years to our customers and
> tell them SORRY
> there is no support for your installed fiber.  We CANNOT tell
> them just pull
> enhanced multimode fiber.
> As it stands 100 meters is not sufficient as a goal for the
> installed base.  10
> GbE will be a backbone technology for campus LANs and must
> support the installed
> cabling.  If we cannot run 10 GbE on installed MM fiber at
> backbone distances,
> we should start telling customers now to pull SM fiber.
> What we really need is a goal that gives us a real backbone
> distance of 200
> meters on the installed MM fiber.
> There has been a plethora of email about support for the WAN on
> this reflector.
> How about some email that communicates support for our
> traditional customer
> base??
> Bruce Tolley
> Manager, Business Development
> 3Com Corporation