Re: Localtalk card questions.

[processoroverclocked@33mhz.cjb.net (Jon Bettencourt)]

Thanks for the info. It still doesn't answer the question of if I can
connect them in parallel on the line... actually, well, I guess it does.
It's not that important anyway.

In article <qp2h5.54315$c33.1909188@typhoon-news1.southeast.rr.com>, "****
****" <***@***.com> wrote:

> Jon Bettencourt wrote in message ...
> 
> >I would be interested in building a cheap localtalk hub! Or at least with
> >more specific instructions on how to use the three PhoneNet connectors I
> >have (does it require an actual phone line or do I just connect them using
> >phone cables? do I need all 4 wires in the cable or does it use 2 like a
> >standard telephone? can they be connected in parallel like telephones? can
> >I just use two unused phone line wires in the house?).
> 
> 
> Jon,
>     Phone cable is enough, doesnt need a phone jack, as such. (Though if you
> have one to spare, it means not having cables snake all over the house.) If
> i remember correctly, only uses 1 pair, the outer. You can connect phone
> over the same wire, as it uses the opposite pair, but not 2 localtalk
> segments over the same cable (too much crosstalk, would ruin the data rate).

Actually, I think both pairs of our jacks are used. The inner is a
residential line and the outer is a business line that we transferred
over. There are something like 4 or 5 or 6 other wires running through the
house, though.

> Using your 3 phonenets goes like this...
> 
> Phonet             A)                B)                 c)
> Jacks             1   2<ph cabl>3  4<ph cabl>5  6
> 
> At this point, jacks 1 and 6 are unused, and I have heard some say they can
> be left like that. However, the proper way is to terminate the bus (just
> like with scsi or 10base2). You do that by plugging localtalk terminators
> into those jacks, or making your own, if you don't have any. You'll need
> rj11 crimpers, a tool that can be bought at walmart for $5. You'll need rj11
> plugs, which can be bought, likely on the same shelf even. You'll need 2
> resistors, which can be bought at Radio Shack. 120ohm 1/4 watt resistors
> will be fine, and i believe the color code for them is brown/red/brown/gold.
> It's obvious how the crimpers work, once you have them, you insert a rj11
> plug, and in this case, instead of putting phone cable in the plug, you'll
> put the resistor. The resistor has 2 wire leads, and these leads should be
> in pins 1 and 4 of the plug (the outer pair). Bend the wire leads of the
> resistor so that they look like this...
> 
> ,-{resistor}-,
> |___    ___|
>       |   |
>       |   |
> 
> Bend gently, while resistors are cheap, you don't want to break them and
> have to give your biography to the Radio Shack bureacrats again.

I think I already went through that process. I have loads of resistors I
haven't already used in other projects.

-- 
Tammy and TIA ----> Jon.

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