[rescue] doubt regarding wireles ethernet...

Thu Jul 19 06:25:06 CDT 2001

This is a multi-part message in MIME format.

------=_NextPart_000_0012_01C11073.8FA7B220
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

hello sir
my name is narendran..........i am a student of electronics and =
communication engg from india.
i am planning to set up a wireless connection between a computer in our =
microwave lab and a neighbouring network of computers.
That is i am trying to make a computer look as if it is one of the lan =
computers.....but linked through wireless....i have an idea in =
mind......i have a pair of transceivers operating at 434Mhz.
which can transmit serial digital data......and receive digital data =
serially......i initially wanted to connect the ethernet o/p port of my =
standalone computer to the transmitter(TX1) at its o/p. then this =
transmitter would transmit the data to the receiver(RX2) on the other =
side.....and the rx's i.e(RX2)'s o/p can be fed as i/p to the ethernet =
port.....on the other side.....but i have a problem...
i have found out that in the ethernet cable there are actually 8 wires =
running through...the 10baseT cable......
among these 2 are called Tx+ and Tx- and 2 are called Rx+ and Rx-.
that makes 4 of the wires....the remaining wires are unused it =
seems........(and not marked  for even some purpose as ground).
by examining the connections between the computer and the device at the =
other end.....i found out that the the connections through the 10BaseT =
cable were as below between the two RJ45 connectors of the computer and =
the hub or the other compuer that is on the other side.........
RJ45 pin(my computer)                       RJ45 pin(hub)

pin1 <---------[ TX+ ]-------------------------[ RX+ ]--> pin3

pin2 <---------[ TX- ]--------------------------[ RX- ]--> pin6

pin3 <---------[ RX+ ]-------------------------[ TX+ ]--> pin1

pin6 <---------[ RX- ]--------------------------[ TX- ]--> pin2

but unfortunately i dont know the functions of the Tx+,Rx+,Rx-,Tx- =
pins........clearly as of yet
however........ i have a hunch that the digital data is sent through the =
Tx+ of the computer and received at Rx+ at the other end........can you =
clarify that point.......?? as to whether what i have in mind is =
correct...........but i dont know what for the Tx- and Rx- pins are used =
for.......by the way i have no information as to how the grounds at the =
two sides are connected......??

like if you want to feed some input from the output of say........an =
amplifier to the next stage amplifier we always connect the o/p to the =
i/p of the next stage.......and the grounds together........as it is the =
reference....but i am not able to find something like this.....
could you clarify these points......i am sure you people must have come =
across these points...some time or the other...it would be very very =
useful to me if you could help me with some information on even one of =
these points.....as without clearly knowing the use of Tx+
and Rx+ and Tx- and Rx- i will not be able to know what should be given =
as i/p to my transmitter and where the receiver's o/p on the other side =
should be given to......

i have just started this project...please do help me.....

awaiting your most valued reply
your's sincerely
Narendran venkatramani

------=_NextPart_000_0012_01C11073.8FA7B220
Content-Type: text/html;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 5.50.4134.100" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV>
<DIV><FONT face=3DArial size=3D4>hello sir</FONT></DIV>
<DIV><FONT face=3DArial size=3D4>my name is narendran..........i am a =
student of=20
electronics and communication engg from india.</FONT></DIV>
<DIV>
<DIV><FONT face=3DArial size=3D4>i am planning to set up a wireless =
connection=20
between a computer in our microwave lab and a neighbouring network of=20
computers.</FONT></DIV>
<DIV><FONT face=3DArial size=3D4>That is i am trying to make a =
computer look as=20
if it is one of the lan computers.....but linked through =
wireless....i have=20
an idea in mind......i have a pair of transceivers operating at=20
434Mhz.</FONT></DIV>
<DIV><FONT face=3DArial size=3D4>which can transmit serial digital =
data......and=20
receive digital data serially......i initially wanted to connect the =
ethernet=20
o/p port of my standalone computer to the transmitter(TX1) at its =
o/p. then=20
this transmitter would transmit the data to the receiver(RX2) on the =
other=20
side.....and the rx's i.e(RX2)'s o/p can be fed as i/p to the ethernet=20
port.....on the other side.....but i have a problem...</FONT></DIV>
<DIV>
<DIV><FONT face=3DArial size=3D4>i have found out that in the ethernet =
cable there=20
are actually 8 wires running through...the 10baseT =
cable......</FONT></DIV>
<DIV><FONT face=3DArial size=3D4>among these 2 are called Tx+ and Tx- =
and 2 are=20
called Rx+ and Rx-.</FONT></DIV>
<DIV><FONT face=3DArial size=3D4>that makes 4 of the wires....the =
remaining wires=20
are unused it seems........(and not marked  for even some purpose =
as=20
ground).</FONT></DIV>
<DIV><FONT face=3DArial><FONT size=3D4>by examining the connections =
between=20
the computer and the device at the other end.....i found out that =
the the=20
connections through the </FONT><FONT size=3D4>10BaseT cable were as =
below between=20
the two RJ45 connectors of the computer and the hub or the =
other=20
compuer that is on the other side.........</FONT></FONT></DIV>
<DIV>
<P><FONT size=3D4>RJ45 pin(my=20
computer)          &nbs=
p;           &nbsp=
;RJ45=20
pin(hub)</FONT></P>
<P><FONT size=3D4>pin1 <---------[ TX+ ]-------------------------[ =
RX+ ]-->=20
pin3</FONT></P>
<P><FONT size=3D4>pin2 <---------[ TX- ]--------------------------[ =
RX- ]-->=20
pin6</FONT></P>
<P><FONT size=3D4>pin3 <---------[ RX+ ]-------------------------[ =
TX+ ]-->=20
pin1</FONT></P>
<P><FONT size=3D4>pin6 <---------[ RX- ]--------------------------[ =
TX- ]-->=20
pin2</FONT></P></DIV>
<DIV><FONT face=3DArial size=3D4>but unfortunately i dont know the =
functions of the=20
Tx+,Rx+,Rx-,Tx- pins........clearly as of yet</FONT></DIV>
<DIV><FONT face=3DArial size=3D4>however........ i have a hunch that the =
digital=20
data is sent through the Tx+ of the computer and received at Rx+ at =
the=20
other end........can you clarify that point.......?? as to whether what =
i have=20
in mind is correct...........</FONT><FONT face=3DArial size=3D4>but i =
dont know=20
what for the Tx- and Rx- pins are used for.......by the way i =
have no=20
information as to how the grounds at the two sides are=20
connected......??</FONT></DIV>
<DIV><FONT face=3DArial size=3D4></FONT> </DIV>
<DIV><FONT face=3DArial size=3D4>like if you want to feed some input =
from the output=20
of say........an amplifier to the next stage amplifier we always connect =
the o/p=20
to the i/p of the next stage.......and the grounds together........as it =
is the=20
reference....but i am not able to find something like =
this.....</FONT></DIV>
<DIV><FONT face=3DArial size=3D4>could you clarify these points......i =
am sure you=20
people must have come across these points...some time or the other...it =
would be=20
very very useful to me if you could help me with some information on =
even one of=20
these points.....as without clearly knowing the use of Tx+</FONT></DIV>
<DIV><FONT face=3DArial size=3D4>and Rx+ and Tx- and Rx- i will not be =
able to know=20
what should be given as i/p to my transmitter and where the receiver's =
o/p on=20
the other side should be given to......</FONT></DIV></DIV>
<DIV><FONT face=3DArial size=3D4></FONT> </DIV>
<DIV><FONT face=3DArial size=3D4>i have just started this =
project...please=20
do help me.....</FONT></DIV>
<DIV><FONT face=3DArial size=3D4></FONT> </DIV>
<DIV>
<DIV><FONT face=3DArial size=3D4>awaiting your most valued =
reply</FONT></DIV>
<DIV><FONT face=3DArial size=3D4>your's sincerely</FONT></DIV>
<DIV><FONT face=3DArial size=3D4>Narendran=20
venkatramani</FONT></DIV></DIV></DIV></DIV></BODY></HTML>

------=_NextPart_000_0012_01C11073.8FA7B220--