The new Magicjack device is wired backwards. Aren't all touch tone telephones polarized? If so, the new device would get nothing but
customer complaints, except from the few customers who have the
knowledge and experience to diagnose and fix the problem.
The new Magicjack device is wired backwards. Aren't all touch tone >telephones polarized? If so, the new device would get nothing but
customer complaints, except from the few customers who have the
knowledge and experience to diagnose and fix the problem.
Starting in the later 1970s, phones began to have bridge rectifiers
installed allowing them to operate with reversed polarity.
Before swapping the phone, make sure it's not your cable that is
wired backwards, since plenty of them swap tip and ring.
It's a standard translucent RJ11 cable. Someone would have to really
work at it to make one of those backwards, since each of the four
wires goes straight through, and remain colinear, parallel, and flat
over the whole length.
Keith F. Lynch <kfl@KeithLynch.net> wrote:
It's a standard translucent RJ11 cable. Someone would have to really
work at it to make one of those backwards, since each of the four
wires goes straight through, and remain colinear, parallel, and flat
over the whole length.
Unfortunately it's very easy. Just put one connector on upside-down
and next thing you know, the positions of the red and green wires are
swapped (as are the positions of the yellow and black). Many of the
cables you see from china are just put on any which way.
Scott Dorsey <kludge@panix.com> wrote:
Unfortunately it's very easy. Just put one connector on upside-
down and next thing you know, the positions of the red and green
wires are swapped (as are the positions of the yellow and black).
Many of the cables you see from china are just put on any which way.
I'm almost certain I've seen the equivalent (only I think it was a
power cord that was supposed to plug a computer into the wall) on
_On Call_ a while ago.
Dorothy J Heydt <djheydt@kithrup.com> wrote:
Scott Dorsey <kludge@panix.com> wrote:
Unfortunately it's very easy. Just put one connector on upside-
down and next thing you know, the positions of the red and green
wires are swapped (as are the positions of the yellow and black).
Many of the cables you see from china are just put on any which way.
I'm almost certain I've seen the equivalent (only I think it was a
power cord that was supposed to plug a computer into the wall) on
_On Call_ a while ago.
About 40 years ago, my employer had a problem with a new disk drive.
To their credit, DEC was able to diagnose the problem over the phone.
The disk was spinning backwards! The cure was to reverse any two of
the three leads in the 240 volt three phase power.
I couldn't open the expensive disk drive (more than ONE HUNDRED
megabytes!) without voiding the warranty. The plug was one-piece
molded. That left the power outlet.
There was no way to remove power from the outlet without removing
power from every outlet in the computer room. I asked the boss when
I could schedule such a shutdown. The answer was "never."
So I rewired a live 240 volt outlet. To be fair, it's only 208 volts
between any two wires.
Keith F. Lynch wrote:
So I rewired a live 240 volt outlet. To be fair, it's only 208 volts
between any two wires.
Why didn't you just wire up a crossover extension cord?
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