Re: [9fans] Old (hardware) are hard to break

[Dan Cross <cross@math.psu.edu>]

> > As you can see, the BNC connector is a Male. The T, of course, has
> > female connectors on the arms of the T. That's why I wondered if
> > it was ok to connect the BNC adapter directly onto an arm of the T.
>
> i see.  stick the adapter on the T and termininator on the other side of the T.

Yes, what Boyd said.  Stick a T onto the adapater (the base, the female
part, goes onto it), and a terminator onto one side, and a piece of RG-58
coax on the other.  Connect the other end of the coax to a T connected to
your ethernet adapter, and stick another terminator on the other side of
that T.  *Both* sides must be properly terminated with a 50-Ohm resister
pack (which is what a terminator is) in order to prevent signal reflection
on the cable, hence the need for two terminators and two T's at the ends
of the network.  Also, be careful with media converters; make sure you
get the power needs right.  In general, I try to avoid converters and
instead would get an old hub with both a 10Base-2 connector and some
10Base-T ports, and then run a cross-over cable (UTP) from that to
your main hub or switch or whatever you've got.

> you remember the vampire taps on think ethernet?  sam principle.  it
> was coax too, but high grade stuff, who name i forget, bu you're using
> RG-58 [50 ohms].  the high grade stuff had N connectors on the ends
> and was used for high [UHF/SHF] freq, high power and was low loss.

I imagine that was probably a bit before his time, but that was RG-1
coax, if I'm not mistaken.  It also has a characteristic impedence of
50 Ohms.

	- Dan C.