| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1385.1 | Basically: YES! | HOO78C::RIETKERK | Bart Rietkerk-Hoogeveen-Holland | Fri Jun 24 1994 08:09 | 15 |
|
Ryan,
Yes, this can be done. I've even done it myself in a test-setup for a
customer using DEMFA's an 2 VAX9000's. I believe it is also officially
supported. But have somebody else confirm that for the Jensen to be
shure. On UTP I don't know if it can be done, but multi-mode fiber
is (again)ok.
I remember there are some notes in this conference discussing just this
subject. Don't have a pointer though. I remember there were some
gotchas in this area. Maybe somebody with some sort of
"engineering-hat" (KONING:KONING?) can confirm this?
Bart Rietkerk.
|
| 1385.2 | Nothing wrong with a 2 node ring. | 4678::PARISEAU | Luc Pariseau | Fri Jun 24 1994 09:42 | 11 |
|
A two node ring is legal. (DAS-to-DAS, SAS-to-SAS, or DAS-to-SAS).
This is true for ANY FDDI equipment.
I don't know about UTP. Can you connect a UTP S port to another UTP S port?
Also, if you have a two node ring with DEC adapters that support FDX (Full Duplex)
you can turn this feature on and MAY get better performance and reduced latency.
(I say "MAY" because it depends on the higher layer protocols.)
Luc
|
| 1385.3 | | STAR::GAGNE | David Gagne - VMS/LAN Development | Fri Jun 24 1994 10:30 | 3 |
| The LAN group in VMS has tested the point-to-point case for the DEFEA;
most recently for OpenVMS AXP V6.1. This is a supported LAN
configuration for OpenVMS AXP V6.1.
|
| 1385.4 | Thanx guys | JOBURG::PRICE | Ryan, 756-4336 | Fri Jun 24 1994 13:20 | 6 |
| Thanx for the prompt response,
from .-1 it seems that the UTP also is OK ? But I think I'll
sell them fibre anyway.
Ryan.
|
| 1385.5 | UTP works like any other PMD | 4371::MELARAGNI | | Fri Jun 24 1994 22:15 | 16 |
| r.e. -.1
Yeah, UTP point-to-point is perfectly functional. I do 90% of my FDDI
testing on two node rings. You'll need a cross-over cable, though. I
think that part is a BN25G-03, but check your DECconnect catalog.
In general, please do not think of UTP any differently than you would
multi- or single mode fiber FDDI ports. From the system level they are
indistinguishable. That was the original goal.
Also, are you sure you want to sell them fiber? In an app like this i
think UTP is the big winner. Cheap cable. Cheaper adapters. The
customer would love it.
bill
UTP Developer
|
| 1385.6 | Third system? | FRKITS::PEINE | Pierre PEINE, DTN 858-5552 | Mon Jun 27 1994 12:09 | 11 |
| Re: .3
A customer is willing to build a FDDI cluster with specific fiber optical cables. As you know, it is prefereable
to have 3 or more systems in a cluster to maintain Cluster Quorum if you loose the connection to one of these
systems.
Is it possible to extent this ring to a third system?
Many thanks for your inputs,
Pierre
|
| 1385.7 | | KONING::koning | Paul Koning, B-16504 | Mon Jun 27 1994 12:47 | 5 |
| No... for 3 or more systems you either need a concentrator, or if you have
DAS adapters you can hook them in a dual ring configuration. But the
special case SAS-SAS applies only to two stations.
paul
|
| 1385.8 | This is getting interesting | JOBURG::PRICE | Ryan, 756-4336 | Mon Jun 27 1994 14:31 | 30 |
|
I'd clean forgotten about quorum. I don't think the
customer could be conned into a third machine (yet),
but just for future reference,
Is this how I'd connect three in a ring ?
Ryan.
+----------+
| Jensen 1 |
| defea-da |
| port 1 --+-\
| port 2 --+- \
+----------+ \ \
| |
+----------+ | |
| Jensen 2 | | |
| defea-da | / |
| port 1 --+- |
| port 2 --+- |
+----------+ \ |
| |
+----------+ | |
| Jensen 3 | | |
| defea-da | / /
| port 1 --+/ /
| port 2 --+-/
+----------+
|
| 1385.9 | | KONING::koning | Paul Koning, B-16504 | Mon Jun 27 1994 15:37 | 6 |
| Yes, that's right.
(To avoid confusing people, you should label the ports by their FDDI
standard designations, "A" and "B".)
paul
|