Would someone please decipher these phone cables?
There are four cables going into the phone box. One of the cables'
blue/dot blue conductors is terminated with a plug and plugged
into a jack. This cable's orange/dot orange conductors is spliced
with the blue/dot blue conductors of the other three cables. There
are more than 9 jacks in the house and all jacks work.
I opened two wall plates and found only one cable in the box.
Thus, these two are not daisy-chained. I assume there is one more
such box somewhere.
What's going on here? Why is orange/dot orange spliced with
blue/dot blue? And how come those three cables still work (can
dial in and out) when they seem not plugged into the phone box?
Typically the first line in a house (line 1) is on the White/Blue
pair. A second line (line 2) on the White/Orange pair. Could there
have been two lines in the house at one time? The second line was
removed and the jacks wired on line 2, the orange pair were connected
to line one. That would extend dial tone to all the jacks without
having to go around to every jack to switch over to the Blue pair.
There could be tap connections made anywhere in the house where the
wire is accessible. There are likely a few daisy chained jacks as well.
The jacks were wired/connected by a hack.
Telephone require two conductors to work. The color of the
insulation is irrelevant. If everything works and you don't want to
make any changes then just close up the box before you break something.
My money is on Mr. E's guess. The first box must be feeding a security
panel somewhere in the house. The security panel needs to be able to
interrupt calls on any of the other jacks in the house if it needs to call
the security company's monitoring center, so all other jacks have to be
wired through that first one.
Even if it USED to have one, alarm company might not bother to rip out
the line seizure jack if they de-install the control box. Or the place
could have been 'prewired for security system' as a feature. Only costs
a few bucks while the walls are open, and the builder gets a kickback
from any residents that actually sign up.
While one wire, it is actually 2 connections- POTS in, and then back out
on a second pair to the rest of the house. The little beige box by the
alarm box is NOT the same as the normal phone jacks.
I second what somebody else said- if all the jacks work, leave well
enough alone, and go buy a DIY telephone wiring book if they are curious.
My house has ADT system. If I want to disconnect, I just remove RJ plug
from the box. I never saw alarm company removing deactivated system.
Right when all is well, leave it alone. I never lived in an old house.
Always have set of blue print which shows all matters. If I do
something, I put a note on the print. When I sell the house and move, I
give it to the next owner.
Someone already mentioned the possibility of an alarm system, if
so, there is a special jack called an "RJ31X" somewhere in a closet
or basement. The phone line is fed to the jack then back to all the
phones in the house. The purpose of the jack is to switch the phones
lines back to the phones in case of alarm system malfunction. The lines
are switched back when you unplug the alarm system from the RJ31X.
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