| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1556.1 | | NETCAD::MELARAGNI | | Sun Jan 22 1995 16:30 | 7 |
| Yes, the DEF6x family of Hub concs contain OBR (optical bypass relay)
outputs. This is the 6 pin MJ connector on the front bezel of the unit.
I am unclear what you think the relationship between SAS, DAS, and OBR
is. I'm curious.
bill
|
| 1556.2 | Great !!! | BOBSEG::SEGREST | Mid-Atlantic TOEM Field Application Engineer | Sun Jan 22 1995 23:34 | 21 |
| Great !!! I am glad to hear the OBR is there...
The client I am working with has a requirement to connect his system
(an Alpha AXPvme single board computer) to an existing dual FDDI ring.
Our FDDI PCI mezzanine card is a single attached station (SAS)
interface. It is a low cost high performance device, but we have to
connect it to the existing dual ring (DAS).
As I understand it, we would normally use a FDDI concentrator to connect
a SAS interface to the DAS ring. In this case what I need is a device
that will allow me to connect one SAS FDDI interface to the FDDI ring.
The DEChub FDDI module with a DEChub One and three PMDs (one to the SAS
interface and two to the DAS ring) list for about $5800 and is twice
the concentrator that I need.
If I am missing something or you know where I can get a $2000 solution,
speak up please....
Bob Segrest
|
| 1556.3 | | NETCAD::STEFANI | Welcome to the Revolution! | Mon Jan 23 1995 06:01 | 19 |
| >>As I understand it, we would normally use a FDDI concentrator to connect
>>a SAS interface to the DAS ring. In this case what I need is a device
>>that will allow me to connect one SAS FDDI interface to the FDDI ring.
Right, and that device is generally an FDDI concentrator or switch.
>>The DEChub FDDI module with a DEChub One and three PMDs (one to the SAS
>>interface and two to the DAS ring) list for about $5800 and is twice
>>the concentrator that I need.
You could use the DEFPZ UTP variant and a UTP PMD for the concentrator
if that helps. Otherwise, I would shop around for the cheapest FDDI
concentrator I could find. I'm sure someone makes some lower cost,
lower port density or unmanageable FDDI concentrators that would work.
Like Bill, I'm at a loss to know what OBR has to do with any of the
above.
- Larry
|
| 1556.4 | OBR controls the relay... | BOBSEG::SEGREST | Mid-Atlantic TOEM Field Application Engineer | Mon Jan 23 1995 09:02 | 11 |
| Sorry, I missed your question... something about the forest and
trees..
The OBR signal is required to controll an external optical bypass relay
where the concentrator connects to the dual attached ring. The intent
is to minimize the impact that a power (or other) failure on one node
might have on the rest of the ring. At least this is the explanation
that the client offered with his requirement.
Bob Segrest
E&RT FAE
|
| 1556.5 | Pointers anyone ??? | BOBSEG::SEGREST | Mid-Atlantic TOEM Field Application Engineer | Mon Jan 23 1995 09:07 | 9 |
| By the way,
I would be very very grateful to anyone who could point me to a low
cost concentrator solution... If anyone knows of one reply here, send
me mail or call me at 703-937-5939. It could be the key to a $50k
short term sale and as much as $3.75M over the next few years.
Bob Segrest
E&RT FAE
|
| 1556.6 | perhaps the 16 port hub conc? | NETCAD::MELARAGNI | | Mon Jan 23 1995 11:51 | 10 |
| Contact Karl Pieper (DELNI::PIEPER). He is the product manager for a
high-density Hub conc. He has info on the cost and availability of the device.
Note that this unit is mostly UTP (12 ports) and supports 2 modPMDs in the front
and 2 in the high-end docking station. The cost-per-port should be very
competitive (if not down right cheap!) compared to our competitors' stuff.
bill
p.s. thanx for clearing up the OBR thing. your need for the OBR is perfectly
consistent with its intended function.
|