| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 4355.1 | Wrong mode of redundancy methinks.... | NETCAD::BATTERSBY | | Tue Apr 15 1997 09:53 | 12 |
| Jeannie, I don't think this is the real intent of the use of the
redundant power kit. The DEChub ONE-MX (DEF1H) is rated for 90 watts.
So as such will not support for example 2 DEFBA's each rated at less
than 90 watts at 67.5w each. I think the intent in use for the
redundant power kit is to have a separate module and docking station
configured for a fail-safe mode where the second docking station and
module would take over for the failed docking station/module, not
that two modules could be powered off the same docking station. The
above fail-safe mode also assumes you have redundant network cable
connections for the second module too.
Bob
|
| 4355.2 | Another comment... | NETCAD::BATTERSBY | | Tue Apr 15 1997 09:56 | 6 |
| Also, the module connected to the dead docking station couldn't
function anyhow what with the dead logic circuitry required by
the Matrix and Secretariat connectors on the docking station logic
card.
Bob
|
| 4355.3 | Any plans for this? | SNOFS1::KHOOJEANNIE | Laziness breeds Efficiency | Tue Apr 15 1997 20:25 | 10 |
| Hi Bob
Thanks for your answers. Our customer wanted to use 2 DECserver 900s,
which together use 27.5W * 2 (<90W in total).
Is this dead logic circuitry easy to "fix", and do we have any plans at
all in this direction?
Thank you
Jeannie
|
| 4355.4 | It's external AC redundancy we're talking about... | NETCAD::BATTERSBY | | Wed Apr 16 1997 10:33 | 18 |
| Well what I meant was that when a docking station loses its power
due to some internal component failure in the AC primary circuit
side of the circuit board, or because of some component failure
on the secondary DC side in the switching power supply circuit,
there is no way that the active components required for an attached
module to "talk" out/in through either the 48 pin connector or the
160 pin connector. Thus, there is no way to "route" the signals
going in/out one set of mated connectors of a docking station module
pair to the second module pair. So only one module/docking station
pair can be used/active while the other has lost its power.
There is nothing to be "fixed" as such. Rather, it in how your
customer must perceive that they can use the redundant power kit.
The redundant power kit allows for external AC redundancy of the
docking stations, not the internal DC side of the docking stations.
So one docking station can not physically power the second module
attached to the second docking station.
Bob
|
| 4355.5 | Not the end of the story? | SNOFS1::KHOOJEANNIE | Laziness breeds Efficiency | Thu May 01 1997 23:00 | 18 |
| More on this topic of DEChub ONE-MX p/s redundancy:
I advised the customer that it wouldn't work, but very embarrassingly,
the customer tested this out, and claims it DOES work!
He has two DECserver 900TMs in two DEChub ONE-MXs, linked with the
H9519-AA. He pulls the AC power cord out of one and both DECservers
are still operational (the LEDs are still working and show a racing 8
as usual).
So what is the story with this? Does anyone know who the product
manager of the DEChub ONE is so this can be confirmed?
Has anyone else in the field had any experience with this?
Regards
Jeannie
|