----- Original Message -----
Sent: Wednesday, July 19, 2000 10:41
Subject: MMF PMD Selection
In the interest of making progress on the MMF PMD
selection, and in
response to Bill's
request for system vendor input, I'll paint a bright
red target on myself. Here goes.
Consider the following four distinct
- Dark fiber/SMF runs up to 40km & WAN
- Dark fiber/SMF runs up to 10km & WAN
interconnect (campus backbone)
- MMF horizontal/vertical runs up to 100/300m
- New fiber (any type: ribbon, MMF, SMF) runs up
to 300m (intra-office)
It is easiest to explain to customers what to
deploy when there is a PMD
match each application (or ideally one that does all). I voted
serial 1550 for app-1, serial 1310 for app-2, 1300
WWDM for app-3 and
left app-4 for the OIF
VSR work activity (as we don't have a general intra-
office interconnect objective, but could adopt/adapt their
results in a later
So why pick 1300 WWDM for app-3? My
- It is the only solution which addresses up to
300m for all installed base.
That is really the end of the rationale. However,
considering cost arguments:
- 1300 VCSELs are supposedly only 6 months away
(or up to 6 years
away depending on the source), which should make
1300 WWDM cost
competitive with 850 VCSEL
Now I'll duck & cover.
David W. Martin
+1 613 765-2901
+1 613 763-2388 (fax)
Bill Wiedemann [SMTP:billw@xxxxxxxxxxx]
Sent: Monday, July 17,
2000 9:34 PM
Subject: RE: what's next ?
Jonathan, Thanks for your clarification on
expectations for the interim
I think it would be very helpful to have a
discussion as to the "systems"
For example their interest in the current
candidates for the 100 meter and
meter objectives. 1300WWDM, 850CWDM, 850 serial.
What they would "need" to see/understand for
these to gain their support,
they never will support one or all of these. My reason for
initiating this is that it will be very
difficult to get any of these
unless we meet their expectations. I hope any of these aren't
approved as the lesser of evils.
Regarding 850CWDM we are planning to make first
implementations with duplex
SC moving to
LC with small form factors. Our expectation is that small form
factor with LC could be available a year from
today. First size will be
electrical interface can be XGMII or XAUI for first implementations.
Should we pursue equalization for 850CWDM to
reach 300 meters over legacy
We have had initial discussions with Brad Booth
and David Cunningham to be
sure that the
clauses for WDM implementations keep up with the current
progress on serial clauses.