| Title: | FDDI - The Next Generation |
| Moderator: | NETCAD::STEFANI |
| Created: | Thu Apr 27 1989 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2259 |
| Total number of notes: | 8590 |
Is there anything about our FDX capable adapters that makes them better for token rings as opposed to just point-to-point? I'm referring specifically to the FDX part. My guess is none...? thanks - Fred
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1259.1 | QUIVER::STEFANI | Have the # for the Mars Observer? | Thu Mar 03 1994 15:07 | 10 | |
>>Is there anything about our FDX capable adapters that makes them better for
>>token rings as opposed to just point-to-point? I'm referring specifically to
>>the FDX part. My guess is none...?
"Token rings"? Not sure what you mean, but the FDDI adapters that are
full-duplex (FDX) capable can go into FDX mode when attached
point-point with another FDX capable adapter -OR- when attached to the
Digital GIGAswitch which has FDX capable ports.
- Larry
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| 1259.2 | KONING::KONING | Paul Koning, B-16504 | Thu Mar 03 1994 17:32 | 10 | |
I think the answer could be "yes". Full duplex operations demands higher internal bandwidth and more buffering in the adapter and in the system driving it. The fact that an adapter is capable of operating in that mode says clearly that it won't have any problem at all running well in normal ring (half duplex) mode. Competitors' adapters may be designed to lesser standards. paul | |||||
| 1259.3 | Summary | TEGAN::DTOP2::Guyton | High Performance Systems | Fri Mar 04 1994 11:05 | 10 |
Thanks. I believe the answers you give me amount to "no" and "yes". No... FDX doesn't help any when sitting on a normal FDDI ring, but, Yes... an adapter that has been designed to do FDX naturally will be a high performing adapter. comments? - Fred | |||||
| 1259.4 | QUIVER::STEFANI | Have the # for the Mars Observer? | Fri Mar 04 1994 21:24 | 21 | |
>>No... FDX doesn't help any when sitting on a normal FDDI ring, but,
Well, with a normal FDDI ring being 3 or more MACs? Yes, you're right,
FDX won't help you. Two adapters point-point still counts as a ring and
FDX can play a part in that (albeit simple) ring. Also, when you move off
an FDDI ring model to an FDDI switch model, FDX can play a useful role.
Bottom line, if you're connected to a concentrator, it doesn't make
much sense to talk to IT in full-duplex, and as soon as you add the
other station, you have 3 MACs and FDX is no longer possible.
>>Yes... an adapter that has been designed to do FDX naturally will be a high
>>performing adapter.
We like to think so, but the truth is, there are very few
systems/applications that would drive the FDDI line speed to the point
where FDX becomes important. This may change as systems get faster and
faster, though, so I don't want to downplay the significance of this
unique characteristic of Digital FDDI adapters.
- Larry
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