| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 413.1 | table with distances | NPSS::GERARD | | Fri Dec 01 1995 12:30 | 30 |
| 413.2 | Thanks! | VAXRIO::ROLF | Vaporware Design Specialist | Tue Dec 05 1995 06:24 | 1 |
| 413.3 | More precisions wanted | LFOIS1::MOUSSU | so unusuaL terM | Wed Dec 20 1995 11:38 | 20 |
| 413.4 | MMF is dispersion limited... | STKHLM::WEBJORN | Gullik Webj�rn Network Advisory | Thu Dec 21 1995 03:55 | 13 |
| 413.5 | Oops... | LFOIS1::MOUSSU | so unusuaL terM | Thu Dec 21 1995 04:47 | 10 |
| 413.6 | | NETCAD::MELARAGNI | | Thu Dec 21 1995 13:11 | 13 |
| 413.7 | Wait and check... | LFOIS1::MOUSSU | so unusuaL terM | Wed Jan 03 1996 06:27 | 16 |
| 413.8 | SMF and other modPHY spec's | NPSS::HUTCHISON | | Sun Mar 23 1997 19:53 | 17 |
| The physical layer requirements/limitations are described in the
ModPHY installation guide. Please have a look. You can pull this
from:
NPSS::USERDISK11:[HPNDOC.MODPHY]MODPHYV3.PS;1
or the web: http://www.networks.digital.com/dr/modphy/
Most of the preceeding notes are pretty close but the manual is
the best source of info.
the only higher layer protocol which might pose another distance
limit over the physical layer is something like flow-control.
At distances of < 60 KM, even that shouldn't be a problem. Something
like TCP, if optimized for local operation, might need some
tweeking. Credit based flow control (Flowmaster) should work fine.
|
| 413.9 | FLOWmaster is for ATM LANs only | NPSS::WATERS | I need an egg-laying woolmilkpig. | Mon Mar 24 1997 09:04 | 10 |
| The FLOWmaster per-VC credit allocation parameter defaults to 15 cells.
That's enough for a VC to run at full OC3 speed across a 2 km link.
(The round-trip delay of 2 km, measured in OC3 cell periods, is 7 cells.
The other 8 cells cover logic delays at both ends.)
I don't generally recommend leaving FLOWmaster enabled across a 60 km
link. To do so would require tuning, and some control over what
protocols/applications are used on the link. We have state-of-the-art
intelligent packet discarding and a large buffer option to provide
very good best-effort service over long links.
|