Cohousing-L Mailing List: Ethernet and intra-networking for cohousing

[Alex G (striker222]

> > Ethernet uses 3 pairs, I think (1 through 6)

Standard "ethernet" can use 2 pairs, or 4, depending on the mode it is 
running.

In Tierra Nueva many houses have 2 pairs for two phone lines, and 2 pairs 
for thier data. This allows 10 megabits a second.


> > Note that 3 levels of hub are allowed

You can have as many levels of hubs as you want, well, within reason. A lan 
is no different than the internet, there are broadcast stations and media. 
As long as there is not too much media inbetween 2 broadcast routers (hubs, 
computers, routers, switches, etc) the signal will perpetuate forever, its 
like a long chain.  Just reading your email you probly went through anywhere 
between 5 and 15.

You MAY be thinking of various LAN standards and measurments, there are IEEE 
standards, and 802.xx standards, for example. They are just
guidelines.



> > I discovered that if you are running 10baseT over cat5 cable, it >>works 
> > if the blue & white pair has a phone line on it.

A wire is a wire is a wire. Color is merely for your own organization, in 
your case, the other end of the line must have been configured in a way that 
made blue the correct choice.

> > I'm not competent to answer that.  But note that cat5 is by definition
> > unshielded.

There are different kinds of cat5-UTP (unshielded twisted pair), strait cat 
5 relies on twisted pairs to cancle out interference.  Cat5-STP, or 
something, is shieled, heavy, thick, and expensive. Note that tierra nueva 
uses Cat5-E, for extended, increases the range a bit.

-Tierra Nueva lan guy


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