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

RE: MMF PMD Selection

Title: MMF PMD Selection
The PMD issue is much more than you have presented.  This is the reason, the 3-PMDs was not voted in.
The 1550 and 1310 serial are not the issue.  The issue is the installed MM fiber, 100 meter or less, or any MM fiber up to 300 meter.  This is the majority of market (80% or more), and the users want the most cost-effective cables, but not any cable at any cost.
Just look at the voting records we had in La Jolla, which is not as straight forward as we like to see.
Try to present a creative solution which will include five PMDs.


Edward S. Chang
NetWorth Technologies, Inc.
Tel: (610)292-2870
Fax: (610)292-2872

-----Original Message-----
From: owner-stds-802-3-hssg@xxxxxxxx [mailto:owner-stds-802-3-hssg@xxxxxxxx]On Behalf Of David Martin
Sent: Wednesday, July 19, 2000 1:41 PM
To: stds-802-3-hssg
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 applications:

  1. Dark fiber/SMF runs up to 40km & WAN interconnect (metro)
  2. Dark fiber/SMF runs up to 10km & WAN interconnect (campus backbone)
  3. MMF horizontal/vertical runs up to 100/300m (in-building)
  4. 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
positioned to 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 thinking:

  1. 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:

  2. 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 WWDM.

Now I'll duck & cover.


David W. Martin
Nortel Networks
+1 613 765-2901  
+1 613 763-2388 (fax)