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

RE: Proposed WAN vs. LAN Terms (Ethernet HSSG)


Bryan,
In response to this comment you made: 

"I've heard a number of individuals state 
that a directly modulated 10 Gb laser is possible.  Lucent seemed to be 
proposing this at the Austin meeting (I believe their eye pattern was from
one 
of these devices).  If this was a directly modulated uncooled DFB without 
isolator, then I believe it would be by far the lowest cost and the most 
straight forward."

Just wanted clarify that the directly modulated, uncooled DFB that Lucent
discussed at the Austin meeting, DOES have an isolator.  I clarified this
with Lucent after their presentation.  The directly modulated, uncooled FP
that they discussed does not have an isolator.

Lisa Buckman
Hewlett-Packard Laboratories
lbuckman@hpl.hp.com



-----Original Message-----
From: bgregory@molex.com [mailto:bgregory@molex.com]
Sent: Monday, May 10, 1999 2:34 PM
To: BRIAN_LEMOFF@HP-PaloAlto-om16.om.hp.com
Cc: stds-802-3-hssg@ieee.org; xclairardin@molex.com; twhitlow@molex.com
Subject: Proposed WAN vs. LAN Terms (Ethernet HSSG)


Hi All,

Just a quick question, is there a "term" defined for the very long reach
version
of 10GEth?  These definitions seem to be important to our discussion.  As
Brian 
from HP stated, we're not being clear on the specific application
environment.  
I'd suggest something like:

10,000Base-SX
        Multi-mode
        Wavelength ~ 850nm
        I'd guess WWDM only
        300m reach over 62.5um fiber

10,000Base-LX
        Single-mode (maybe also multi-mode)
        Wavelength ~ 1310nm or 1550nm
        WWDM, Serial or MAS
        10km reach

10,000Base-EX   (EX=Extended Length)
        Single-mode
        Wavelength ~ 1550nm 
        DWDM or Serial
        Externally modulated
        Long Reach
        (similar to what Bill St. Arnaud is talking about)

Also, I've seen some comments on the serial version of the 10,000Base-LX
that 
assume it'll be externally modulated.  I've heard a number of individuals
state 
that a directly modulated 10 Gb laser is possible.  Lucent seemed to be 
proposing this at the Austin meeting (I believe their eye pattern was from
one 
of these devices).  If this was a directly modulated uncooled DFB without 
isolator, then I believe it would be by far the lowest cost and the most 
straight forward. Regarding the 10,000Base-EX, I'd (obviously) assume that
this 
was only externally modulated.

Regards,
Bryan Gregory
bgregory@molex.com
630/512-8520