Re: WLAN in and between two buildings - solutions?
- From: Jeff Liebermann <jeffl@xxxxxxxxxxxxxxxxxxxxxx>
- Date: Sat, 01 Apr 2006 11:25:33 -0800
Carl <"c.j[dot]w"@telia.com> hath wroth:
I'm planning to share an internet connection wirelessly. I've made a
sketch that can be seen on http://www.wernhoff.com/wlan/wlan.gif.
Only 40 meters between buildings? Run wires between buildings.
Install one access point in each building.
I want to have WLAN in both buildings.
At 40 meters, you might be able to do this with one wireless access
point. If the building is fairly RF transparent, might be possible.
The internet connectoin comes
from a cable modem in the small building. All parts of the buildings
must be covered (some computers are in the corners). Haven't worked much
with WLAN and would like some suggestions.
I considered a range expander/repeater, but since they cut bandwidth in
half, I don't think it's an option.
No. Please don't do that. You have the wires, use them.
I also considered to use a coaxial cable, that happens to be in-place
between the buildings already. Would it be possible to put a wireless
router at the cable modem, connect some kind of splitter to the coaxial
antenna-connection on the router, then connect one of the splitter
outputs to an antenna, to provide coverage in the small building, and
the other output to the coaxial cable between the buildings, and have an
antenna in the other end of the coaxial cable in the big building?
There's a garage half-way on the coaxial cable, there it would be
possible to put a booster if neccessary.
Yes, it would be possible to pass 2.4GHz down the coaxial cable.
TCI/Comcast experimented with such a system. I've used RG-6/u for
antenna coax. The problem is that it's very lossy. You will need
some very expensive bi-directional amplifiers. Not recommended.
A third alternative could be to put an antenna on the small building,
pointing at the big building. Would that provide coverage enough in the
big building? A drawback with this soultion is that I would have to do
some work laying out a cable through the small building.
It really depends on what's in the walls of the big building. If you
have aluminum foil backed insulation, it may not work. At 40 meters,
it's worth trying.
The "right" way to do this is to use two access points, one in each
building. Note that you can use a wireless router as an access point.
Instructions on request.
| | |10/100 | |wireless |
|cable modem | |Ethernet | |access |
|and router |=====cat 5=====|Switch |=====cat 5====|point #1 |
| |
| |cat5
| |
| |wireless |
| |access |
| |point #2 |
The channels on the two access points should be different (1, 6, or 11
for US). However, the SSID can be the same or different depending on
whether you want seamless roaming, or manually decide which access
point to connect.
Another possibility is to simply use the existing coax cable for
10base2 ethernet. If it's not used for CATV, then it can be used for
data. It really doesn't matter much if it's 50 or 75 ohms as long as
there are not "taps" along the run. I've done this many times.
However, you will be limited to 10baseT-HDX (half duplex) and will not
be able to run 100baseT.
If you coax cable is being used for CATV, then you can share the
connection with data.
| http://www.multilet.com/us/baseband/product_range/product_range.htm
Details later if you need them...
--
Jeff Liebermann jeffl@xxxxxxxxxxxxxxxxxxxxxx
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
.
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