| Title: | DEChub/HUBwatch/PROBEwatch CONFERENCE |
| Notice: | Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7 |
| Moderator: | NETCAD::COLELLA DT |
| Created: | Wed Nov 13 1991 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 4455 |
| Total number of notes: | 16761 |
Presently we make 2 kinds of DEChubs. A low end and an upper middle.
The low end has a single 78 watt power supply. The modules each have a
maximum power usage of 9 watts. since there are 8 slots the most power
that you can consume is 72 watts. no math. The upper middle can have
multiple supplies. If you have a large module, the management agent
determines how many supplies and how many modules then figuring out if
it can turn on all the modules. mnagement agent treats the small
modules as 9 watts. no user math.
Let's say that I'm going to design a new wizbang DEChub 90 module. I
can make it smaller and cheaper than a large module. I can make it for
a REAL attractive price. so cheap you'ld buy 2 just cuz their purty.
only problem is that for me to put 8 ports on it, it will draw more
than 9 watts. my alternatives are:
- build it, but say that you can only use 6 of them in the DEChub
90, 8 in a DEChub 900.
- build it and a larger supply for the DEChub 90 so you can use the
product and other 90 products in all 8 slots. you will have
to use your calculators to determine which supply you need.
- build a 900 style product, but the entry cost will be higher.
and only work in the 900
- build something that looks like neither. works in neither hub.
Can you and your customers handle a product that operates out of the
power rules of the DEChub 90 as they have been? send comments to
[email protected] or [email protected].
note: before John Danzak gets any ideas, I'm not talking about changing
the number of supplies, the backplane, ...
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1969.1 | Aren't documented today anyway | PTOJJD::DANZAK | Pittsburgher � | Wed Feb 08 1995 21:55 | 14 |
Keith - documenting the CURRENT needs of the 90 hub modules in ANY
customer accessable document would be a first step forward. There are
NO documnted 90 module restrictions in ANY customer publication that I
can find (easily).
Examples:
- Only ONE DECbridge 90 in a hub
- Slot 7/8 power restrictions (i.e. no more than 2 AUI modules in the
hub)
- DECbrouter slot restrictions
- etc.
Can we get THESE documented?
j
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| 1969.2 | Thank for the feedback. Not! | NETCAD::GALLAGHER | Fri Feb 10 1995 11:32 | 5 | |
Gee, this sure seems one-sided to me. When engineering asks questions the only reply is a slam that doesn't even address the question. Just an observation. -Shawn | |||||
| 1969.3 | Lower your standards, boy! | ROGER::GAUDET | Because the Earth is 2/3 water | Fri Feb 10 1995 12:51 | 9 |
Shawn Shawn Shawn, You expected something different? We don't respond to a question within 24 hours and there's a follow-up note with a title something like "IS ANYBODY THERE?" or "NOBODY CAN HELP?" Par for the course, in my opinion. I consider it a victory if there's more than one non-engineering reply, content notwithstanding. Answer Grape #12 | |||||
| 1969.4 | KAOFS::S_HYNDMAN | Acronym Decoder Ring Architect | Fri Feb 10 1995 17:14 | 14 | |
Miller time boys.
I read the note and the last line which indicated that responses should be
mailed to the author. Perhaps that is why there weren't many replies.
As for my two cents.
Build the thing and document the restriction. There are already many
configuration exceptions (some power related) as -2 highlighted. The
plug and play model is already broken.
Scott
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| 1969.5 | NETCAD::GERHARDT | Out of Control | Fri Feb 17 1995 15:24 | 17 | |
!Examples:
! - Only ONE DECbridge 90 in a hub
! - Slot 7/8 power restrictions (i.e. no more than 2 AUI modules in the
! hub)
! - DECbrouter slot restrictions
! - etc.
re .1
you can put TWO DECbridge 90s in a hub and there are NO
DECbrouter slot restrictions. Slot 7/8 power restrictions are
documented on page 1-3 of the DEChub 90 owner's manual.
re .3
I have not received any mail, but appreciate you comments.
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