I realize this is more of a hardware rather than owfs question but it is
directly related to owfs functionality so here goes:
I have a bunch of existing 4-wire untwisted telephone station cable I
want to use for 1-wire. It is all home run (star) wired currently which
is not ideal for a 1-wire bus. So my question is whether I would get
better performance with a star wired bus or if, by wiring pairs of wires
together at the "ends of the star" I would get better results making a
long serial connection.
If that doesn't make sense below is some ascii art that will hopefully help:
Star wiring method (where the lines represent the red/green pair of the
4 wire telephone station cable and "+" represents a splice):
|--10 ft--DS1825
|
DS1490F--15 ft--+--20 ft--DS1825
|
|--60 ft--DS1825
Serial wiring method using the same cable as above (where the lines to
the DS1825 represent the red/green pair of the 4 wire telephone station
cable and "+" represents a connection between a red/green and a
yellow/black pair):
DS1490F--15 ft--10 ft--+-DS1825
|
|--10 ft--|
+
|--20 ft--+-DS1825
|
|--20 ft--|
+
|--60 ft----DS1825
The advantages to the star wiring example is that the distances between
each DS1825 and the DS1490 are shortest and only a single pair of wires
is required to each DS1825. The primary disadvantage seems to be signal
reflection at each of the three DS1825s.
On the other hand the advantage of the serial wiring is that there is
only one end of the bus so only one signal reflection. However, the
maximum length from one end of the bus to the other has gone up to 120
ft and for most of that there are bus signals traveling in opposite
directions along untwisted cable.
Realizing that neither is ideal does anyone have a recommendation for
the best choice between the two?
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