Distance Motion
- To: Thomas Dineen <tdineen@xxxxxxxxxxxxx>, HSSG Distance <stds-802-3-hssg-distance@xxxxxxxx>
- Subject: Distance Motion
- From: Roy Bynum <RBYNUM/0004245935@xxxxxxxxxxx>
- Date: Thu, 24 Jun 1999 17:09:28 -0500 (EST)
- Sender: owner-stds-802-3-hssg-distance@xxxxxxxxxxxxxxxxxx
Thomas, et al,
I am in favor of having a LAN only distance definition, motion item
1.
Because of optical networking issues, such as optical amplifiers, OEO
transducers, DWDM, etc., I can not seperate the MAN (10000BaseLX)
interface from a WAN (10000BaseLX) interface. In spite of an attempt
to create a language that appears to limit the distance to MAN
applications, exiting 1000BaseLX is being deployed as a WAN interface.
In optical transmission interfaces, there is not a distinction between
MAN and WAN. They use the same wavelength; they use the same output
power; they use the same framing and link protocol; they use the same
single mode fiber; they use the same physical interface. Look at what
Bill St. Arnaud is doing at CANARIE. I can not agree to the motion to
seperate the MAN from the WAN, items 2 and 3.
The issue of fiber type and distance are specifically linked. Any
interface that uses multi-mode fiber (MMF) is limited to LAN systems.
Any interface that uses single-mode fiber (SMF) can be used in MAN/WAN
systems in addition to LAN systems. In MAN/WAN systems, wavelengths
can be either in the S band, C band, or the L band. All three use SMF.
All three have been used for interfaces in both MAN and WAN systems.
The difference that I see between LAN and MAN/WAN interfaces is the
fiber type.
Roy Bynum
Optical and Data Network Technology Development,
MCI WorldCom
(972) 729-7249