what nodes? (was [Cu-wireless] Memory for nodes)

Perry Melange pmelange at null.cc.uic.edu
Fri Jan 24 07:40:32 CST 2003

I am willing to put money in the pot to buy needed radios and antenna.  
How much do they cost and how many of each do you think we should order.  
I will also put money toward buying expiremental hardware.


On Thu, 23 Jan 2003, David Young wrote:

> What nodes? =)
> Seriously, we have more install candidates near Urbana High School than
> we have nodes. And then there is the 400 block of Green Street, where
> I think we could install at three more homes, easy.
> Incidentally, I am still looking for an inexpensive local distribution,
> and I am not finding it. Any ideas?
> We have cable and connectors for a few installs.  We need radios and
> antennas.
> I want to survey on Ivan's roof just as soon as the snow has melted from
> it. I forgot to check it this AM. Ivan's is an iffy install because we
> will have to use a lot of cable or an outdoor router. The outdoor router
> is more than we can afford.
> The LinkSys WET11 is a tiny ethernet<->wireless bridge with decent
> output power and mediocre receive sensitivity (but mediocre beats
> crappy any day). Detaching its antenna exposes an RP-SMA connector.
> If it will not already tap ethernet for DC power (not the laboratory
> namesake, but the electricity), then we can build it a tap using plans at
> nycwireless.net. Then we can buy/build the injector.  I think that if we
> "pull a ham" and put it in Tupperware with holes punched for ethernet
> and radio connector, then we've avoided excessive cable losses on the
> cheap. Maybe....
> We still need to attach a PC to provide the routing/forwarding function,
> and we should to verify certain properties of the WET11, such as its
>   1 power requirements (50 feet Cat5 turns a lot of electricity
>     to heat, but a 48VDC injector could cook the thing at 75)
>   2 its radio properties (I think that it is superior to our WMP11's,
>     with 100mW and -83dB RX sensitivity, but maybe I am wrong)
>   3 its configurability for channel and SSID (I prefer that it is
>     Web- or SNMP-configurable. I have read that it will start a Web
>     configurator if you give it an IP by DHCP, but seeing is believing.)
>   4 its ability to handle an IBSS merge (this should not be a problem
>     if it has a Prism MAC with recent firmware, but you never know)
>   5 temperature range
>   6 software reliability (does it conk out after N hours or Q packets?)
> If somebody on the list already owns one of these, maybe you will put
> it through its paces? If not, I will front the lesser of $50 or half the
> purchase price for a WET11 if somebody will evaluate its suitability by
> those criteria.
> Dave
> On Thu, Jan 23, 2003 at 10:34:43PM -0600, Perry Melange wrote:
> > Hey, I have just gotten 19 pieces of 72 pin SIMM memory for us to use on 
> > the nodes.  Do we want to get together some time soon and set up a few 
> > computers?
> > 
> > Perry
> > 
> > -- 
> > Perry Melange      "Make things as simple as possible, but no simpler."
> > pmelange at null.cc.uic.edu                              - Albert Einstein
> > http://null.cc.uic.edu/~pmelange/resume
> > 
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Perry Melange      "Make things as simple as possible, but no simpler."
pmelange at null.cc.uic.edu                              - Albert Einstein

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