| Author |
Message |
Ted
Guest
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 Posted:
Tue Nov 08, 2005 5:11 pm Post subject:
Re: Multi-drop network |
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Paul Carpenter wrote:
| Quote: | Personally at these rates either use as someone else has said PC104plus for
higher bandwidth.
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No problem.
| Quote: | Then consider 100baseT network and accept the uncertainty factor,
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Its not a real time issue, its a "20 port switches for industrial
temperature ranges cost serious money" issue.
| Quote: | Personally I think you are trying to "fit a quart into a pint pot".
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I'm designing down to a price. If it can't be done I'll have to think
again.
TW |
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Meindert Sprang
Guest
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| Posted:
Tue Nov 08, 2005 5:15 pm Post subject:
Re: Multi-drop network |
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"Ted" <ted.wood@sortex.com> wrote in message
news:1131448317.622174.182400@g44g2000cwa.googlegroups.com...
| Quote: | Its not a real time issue, its a "20 port switches for industrial
temperature ranges cost serious money" issue.
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And developing your own interface from scratch isn't?
Meindert |
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Ted
Guest
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| Posted:
Tue Nov 08, 2005 5:15 pm Post subject:
Re: Multi-drop network |
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Meindert Sprang wrote:
| Quote: | Its not a real time issue, its a "20 port switches for industrial
temperature ranges cost serious money" issue.
And developing your own interface from scratch isn't?
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I've got no interest at all in developing an interface from
scratch.Thats why I'm asking here.
Although if it meant saving the cost of a 20 port Ethernet switch in
each machine I'd give it serious consideration.
TW |
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Anton Erasmus
Guest
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| Posted:
Wed Nov 09, 2005 12:09 am Post subject:
Re: Multi-drop network |
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On Tue, 08 Nov 2005 11:31:42 +0100, Rene Tschaggelar <none@none.net>
wrote:
| Quote: | Ted wrote:
I'm looking for a networking technology with the following requirements
1. Multidrop.No hub/router/switch
2. Up to 20 nodes
3. Transfer rate > 3MBytes/s
5. Supported by an off-the-shelf PC104 type card for an industrial PC
(master)
5. Easy to implement in HW (slave)
Anyone got any ideas? CANBus comes close, but isn't fast enough.
With simple selfmade hardware this specification is
doable. As physical medium choose RS422, RS485, LVDS,
all on twisted pair. A separate clock line allows
synchroneous hardware. As serializer/deserializer,
have a look at CPLDs & Serdes.
|
TI makes a number of serdes chips.
Maybe IEEE 1399 is an option ? Upto 63 devices may be daisy chained
and the data rate is 400Mb/s. Cable length between devices are only
upto 4.5m. It looks like one of the variants based on this core
technology should handle your requirements.
Regards
Anton Erasmus |
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Rene Tschaggelar
Guest
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| Posted:
Wed Nov 09, 2005 5:15 pm Post subject:
Re: Multi-drop network |
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Ted wrote:
| Quote: | Paul Carpenter wrote:
Personally at these rates either use as someone else has said PC104plus for
higher bandwidth.
No problem.
Then consider 100baseT network and accept the uncertainty factor,
Its not a real time issue, its a "20 port switches for industrial
temperature ranges cost serious money" issue.
|
I recently got a 16port 10/100Mbit Switch at FRYs for 20$,
possibly not industrial temperature range.
Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net |
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Guest
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| Posted:
Thu Nov 17, 2005 5:15 pm Post subject:
Re: Multi-drop network |
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| Quote: |
Anyone got any ideas?
Cheers
TW
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Processing power is cheaper than high speed interfaces.
Can you compress the data by a factor of 3? |
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Rosie
Guest
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Rosie
Guest
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Rosie
Guest
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Grant Edwards
Guest
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| Posted:
Thu Dec 01, 2005 5:15 pm Post subject:
Re: Multi-drop network |
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On 2005-11-30, Rosie <rcabrero@altera.com> wrote:
And this has what, exactly, to do with multi-drop networks?
--
Grant Edwards grante Yow! You should all JUMP
at UP AND DOWN for TWO HOURS
visi.com while I decide on a NEW
CAREER!! |
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Arie de Muynck
Guest
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| Posted:
Fri Dec 02, 2005 1:15 am Post subject:
Re: Multi-drop network |
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"Grant Edwards" ...
| Quote: | On 2005-11-30, Rosie...
Altera is looking for Sr. Applications Engr.
...........
And this has what, exactly, to do with multi-drop networks?
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Well, the message was dropped in this networked group 3 times...
Arie de Muynck |
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