DComTalk.com

by vm » Sun Feb 13, 2005 12:01 am

I want to use the existing coaxial connections in my house that is for
cable tv for my ethernet LAN.

Basically I would like to use a connection from my fast ethernet
switch, cat 5, somehow connect it to the coaxial cable that was built
into my house for tv. Then at the other end of the tv cable in a
specific room convert back to cat 5 ethernet into another fast ethernet
switch.

I tried wireless, but there is too much signal loss. The coaxial cable
is not being used from my server room to the upstairs room I want to
connect.

I searched BlackBox for converters, but am not sure what I was looking
for is even possible.

Any ideas what product might work for this and where to get it?

Thanks

V

by **Watson A.Name - \"Watt Su** » Sun Feb 13, 2005 12:32 am

"vm" <ntdude4@hotmail.com> wrote in message
news:1108250096.948508.69230@l41g2000cwc.googlegroups.com...

I want to use the existing coaxial connections in my house that is for
cable tv for my ethernet LAN.

Basically I would like to use a connection from my fast ethernet
switch, cat 5, somehow connect it to the coaxial cable that was built
into my house for tv. Then at the other end of the tv cable in a
specific room convert back to cat 5 ethernet into another fast
ethernet
switch.

I tried wireless, but there is too much signal loss. The coaxial cable
is not being used from my server room to the upstairs room I want to
connect.

I searched BlackBox for converters, but am not sure what I was looking
for is even possible.

Any ideas what product might work for this and where to get it?

It's not possible with fast ethernet. Regular 10Mb ethernet would work
if it's a 50 ohm cable, but regular coax is 75 ohms, and will give you
great grief if you use it. Stick with wireless or else pull regular
cat5e cable between the two places.

Thanks

V

by vm » Sun Feb 13, 2005 1:14 am

Crud, I was afraid of that. I will keep working on the wireless
solution.

Thanks for the info..

V

Watson A.Name - "Watt Sun, the Dark Remover" wrote:

"vm" <ntdude4@hotmail.com> wrote in message
news:1108250096.948508.69230@l41g2000cwc.googlegroups.com...
I want to use the existing coaxial connections in my house that is
for
cable tv for my ethernet LAN.

Basically I would like to use a connection from my fast ethernet
switch, cat 5, somehow connect it to the coaxial cable that was
built
into my house for tv. Then at the other end of the tv cable in a
specific room convert back to cat 5 ethernet into another fast
ethernet
switch.

I tried wireless, but there is too much signal loss. The coaxial
cable
is not being used from my server room to the upstairs room I want
to
connect.

I searched BlackBox for converters, but am not sure what I was
looking
for is even possible.

Any ideas what product might work for this and where to get it?

It's not possible with fast ethernet. Regular 10Mb ethernet would
work
if it's a 50 ohm cable, but regular coax is 75 ohms, and will give
you
great grief if you use it. Stick with wireless or else pull regular
cat5e cable between the two places.

Thanks

V

by **Lucas Tam** » Sun Feb 13, 2005 3:02 am

"vm" <ntdude4@hotmail.com> wrote in news:1108250096.948508.69230
@l41g2000cwc.googlegroups.com:

I want to use the existing coaxial connections in my house that is for
cable tv for my ethernet LAN.

Check muxlab.com

--
Lucas Tam (REMOVEnntp@rogers.com)
Please delete "REMOVE" from the e-mail address when replying.
http://members.ebay.com/aboutme/coolspot18/

by **Tomi Holger Engdahl** » Mon Feb 14, 2005 8:38 am

"vm" <ntdude4@hotmail.com> writes:

I want to use the existing coaxial connections in my house that is for
cable tv for my ethernet LAN.

Basically I would like to use a connection from my fast ethernet
switch, cat 5, somehow connect it to the coaxial cable that was built
into my house for tv. Then at the other end of the tv cable in a
specific room convert back to cat 5 ethernet into another fast ethernet
switch.

I tried wireless, but there is too much signal loss. The coaxial cable
is not being used from my server room to the upstairs room I want to
connect.

I searched BlackBox for converters, but am not sure what I was looking
for is even possible.

Any ideas what product might work for this and where to get it?

The TV coaxial cable that was built to into the house is most
propably 75 ohm coaxial cable.
I don't know any produxt that runs fast Ehternet (100 Mbit/s)
over it, but there are several wayus how 10 Mbit/s Ethernet
could run over it.

One idea would be try to find some really old thin Ethernet
product that can be configured to both standard 50 ohm
wiring and also for 75 ohm wiring. Those products
have existed, but I haven't seen them available for many
years.

There are some companies that adapt 10Base-T Ethernet to
75 ohm coaxial cable. Take a look at those links:
http://www.etslan.com/ethernet.php
http://www.teleste.fi/index.phtml?page_ ... i_id=1114&

--
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at
http://www.epanorama.net/

by **Phil Partridge** » Mon Feb 14, 2005 3:40 pm

In article <1108257287.428539.203520@o13g2000cwo.googlegroups.com>, vm
<ntdude4@hotmail.com> writes

Crud, I was afraid of that. I will keep working on the wireless
solution.

All..

Lateral thinking..

Could the co-ax be used to get the wireless signal up the building to
another aerial? - Not sure of frequencies we are talking here.

May be enough signal to get a connection?

Thoughts??
Phil Partridge
philp@pebbleGRIT.demon.co.uk
Remove the grit to reply

by **Al Dykes** » Mon Feb 14, 2005 3:58 pm

In article <64FnkHALaMECFwWp@pebble.demon.co.uk>,
Phil Partridge <philp@pebbleGRIT.demon.co.uk> wrote:

In article <1108257287.428539.203520@o13g2000cwo.googlegroups.com>, vm
ntdude4@hotmail.com> writes
Crud, I was afraid of that. I will keep working on the wireless
solution.

All..

Lateral thinking..

Could the co-ax be used to get the wireless signal up the building to
another aerial? - Not sure of frequencies we are talking here.

May be enough signal to get a connection?

Thoughts??
Phil Partridge
philp@pebbleGRIT.demon.co.uk
Remove the grit to reply

I just found a chart that shows TW coax (RG58) at 1.1 db/M attenuation
at 1800GHz. (it's worse at 2.4GHz) That's 200 db down from about 200
mw. I don't think it'll work

It would have to be "g" wifi to be faster than what he's got now.

There is a bunch of faster wide area radio neworking standards coming,
isn't there ? At some point the OP will be able to set up a couple
small discs and be done with it.

There is laser point-to-point equipment if he's got line of sight.
All it takes is money.

I say pull fiber. He's already paid for the expensive part; the
conduit. It's a good asset.

--

a d y k e s @ p a n i x . c o m

Don't blame me. I voted for Gore.

by **James Knott** » Mon Feb 14, 2005 5:32 pm

Phil Partridge wrote:

Could the co-ax be used to get the wireless signal up the building to
another aerial? - Not sure of frequencies we are talking here.

Commonly used coax, including that used for TV, has very high loss at WiFi
frequencies (2.4 or 5 GHz).

by **Tomi Holger Engdahl** » Tue Feb 15, 2005 3:01 am

adykes@panix.com (Al Dykes) writes:

Could the co-ax be used to get the wireless signal up the building to
another aerial? - Not sure of frequencies we are talking here.
May be enough signal to get a connection?

I just found a chart that shows TW coax (RG58) at 1.1 db/M attenuation
at 1800GHz. (it's worse at 2.4GHz) That's 200 db down from about 200
mw. I don't think it'll work

The coaxial cable used for cable TV connections is not RG-58.
RG-58 is 50 ohm coaxial cable used for other radio applications.

Cable TV systems and TV antenna systems are built using 75 ohm
coaxial cable.
Generally the traditional cable for video installations has been
RG-59, RG-11, RG-6 and TELLU 13.
RG-59 is the default cale for many not so demanding antenna
wiring applications and for baseband video. For a good quality antenna
cable wiring quad-shielded all-copper center conductor RG-6 cable is
recommended.

You can find some 75 ohm coaxial cable data at
http://www.epanorama.net/documents/video/videocoax.html

Those are geenrally lower loss cables than the RG-58 you mentioned.
The problem in using then for WiFi applications is that the cable
is 75 ohm, while WiFi equipment and antennas are designed for 50 ohm
cable.

--
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at
http://www.epanorama.net/

by **Watson A.Name - \"Watt Su** » Tue Feb 15, 2005 3:01 am

"Phil Partridge" <philp@pebble.demon.co.uk> wrote in message
news:64FnkHALaMECFwWp@pebble.demon.co.uk...

In article <1108257287.428539.203520@o13g2000cwo.googlegroups.com>, vm
ntdude4@hotmail.com> writes
Crud, I was afraid of that. I will keep working on the wireless
solution.

All..

Lateral thinking..

Could the co-ax be used to get the wireless signal up the building to
another aerial? - Not sure of frequencies we are talking here.

May be enough signal to get a connection?

The 2.4 GHz wireless signal is too high a freq for that coax. The
losses would be so great that the signal would be rapidly attenuated.
The coax has a difficult time with UHF TV signals at the highest end at
800 MHz.; wireless would be three times this high.

Thoughts??
Phil Partridge
philp@pebbleGRIT.demon.co.uk
Remove the grit to reply

by **Watson A.Name - \"Watt Su** » Tue Feb 15, 2005 8:14 am

"Al Dykes" <adykes@panix.com> wrote in message
news:cuqhs0$35g$1@panix5.panix.com...

In article <64FnkHALaMECFwWp@pebble.demon.co.uk>,
Phil Partridge <philp@pebbleGRIT.demon.co.uk> wrote:
In article <1108257287.428539.203520@o13g2000cwo.googlegroups.com>,
vm
ntdude4@hotmail.com> writes
Crud, I was afraid of that. I will keep working on the wireless
solution.

All..

Lateral thinking..

Could the co-ax be used to get the wireless signal up the building to
another aerial? - Not sure of frequencies we are talking here.

May be enough signal to get a connection?

Thoughts??
Phil Partridge
philp@pebbleGRIT.demon.co.uk
Remove the grit to reply

I just found a chart that shows TW coax (RG58) at 1.1 db/M attenuation
at 1800GHz. (it's worse at 2.4GHz) That's 200 db down from about 200
mw. I don't think it'll work

First off, TV coax isn't RG-58 which is 50 ohms, it's usually 75 ohm
cable, typically RG-59 or RG-6. And I think you meant 1800MHz, or
1.8GHz, _not_ 1800GHz.

But I agree that it probably won't work.

[snip]

There is laser point-to-point equipment if he's got line of sight.
All it takes is money.

Laser is expensive, and it's also prone to outages caused by rain and
fog.

Here's a cheap optical system that a guy made that can go a half mile or
so and is a good way to keep you busy for the winter months.
http://ronja.twibright.com/

I say pull fiber. He's already paid for the expensive part; the
conduit. It's a good asset.

--

by **Al Dykes** » Tue Feb 15, 2005 1:57 pm

In article <1113bmnrvcft252@corp.supernews.com>,
Watson A.Name - \"Watt Sun, the Dark Remover\" <alondra101@hotmail.com> wrote:

"Al Dykes" <adykes@panix.com> wrote in message
news:cuqhs0$35g$1@panix5.panix.com...
In article <64FnkHALaMECFwWp@pebble.demon.co.uk>,
Phil Partridge <philp@pebbleGRIT.demon.co.uk> wrote:
In article <1108257287.428539.203520@o13g2000cwo.googlegroups.com>,
vm
ntdude4@hotmail.com> writes
Crud, I was afraid of that. I will keep working on the wireless
solution.

All..

Lateral thinking..

Could the co-ax be used to get the wireless signal up the building to
another aerial? - Not sure of frequencies we are talking here.

May be enough signal to get a connection?

Thoughts??
Phil Partridge
philp@pebbleGRIT.demon.co.uk
Remove the grit to reply

I just found a chart that shows TW coax (RG58) at 1.1 db/M attenuation
at 1800GHz. (it's worse at 2.4GHz) That's 200 db down from about 200
mw. I don't think it'll work

First off, TV coax isn't RG-58 which is 50 ohms, it's usually 75 ohm
cable, typically RG-59 or RG-6. And I think you meant 1800MHz, or
1.8GHz, _not_ 1800GHz.

But I agree that it probably won't work.

[snip]

There is laser point-to-point equipment if he's got line of sight.
All it takes is money.

Laser is expensive, and it's also prone to outages caused by rain and
fog.

Here's a cheap optical system that a guy made that can go a half mile or
so and is a good way to keep you busy for the winter months.
http://ronja.twibright.com/

I talked to a guy that had something to do with that project. It's
neat. DIY and Open Source hardware.

I may have mixed up two threads. One guy aready ahd a 600 ft TW (RG58)
connection in conduit beteen two buildings. I thought this was a
question about connecting WiFI gear to his coax.

I say pull fiber. He's already paid for the expensive part; the
conduit. It's a good asset.

--

--

a d y k e s @ p a n i x . c o m

Don't blame me. I voted for Gore.

by **James Knott** » Tue Feb 15, 2005 1:58 pm

Al Dykes wrote:

I just found a chart that shows TW coax (RG58) at 1.1 db/M attenuation
at 1800GHz.

That a really high frequency. Perhaps you meant 1.8 GHz?

by **T. Sean Weintz** » Tue Feb 15, 2005 10:28 pm

Tomi Holger Engdahl wrote:

The coaxial cable used for cable TV connections is not RG-58.
RG-58 is 50 ohm coaxial cable used for other radio applications.

It's 50ohm cable used for ethernet. Before 10baseT came out, 90% of
ethernet ran over rg-58

by **T. Sean Weintz** » Tue Feb 15, 2005 10:37 pm

Al Dykes wrote:

I just found a chart that shows TW coax (RG58) at 1.1 db/M attenuation
at 1800GHz. (it's worse at 2.4GHz) That's 200 db down from about 200
mw. I don't think it'll work

1800Ghz? AWSOME! Infrared over coax!

LOL.

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