I am redoing some phone wiring and have some questions. I'm thinking that I
might as well wire for two lines while I'm at it.
First, an explanation of my existing wiring. The cable from the telephone
company goes to an old 98A lightning protector in what used to be our
garage, now the attic of our den. Here is a picture:
Notice two thick black wires from phone company connected to the two
terminals at the top of the lightning protector.
QUESTION ONE. The cable from the telephone pole to the lightning protector
has two thick wires. To get an additional line, would the phone company
replace that with a 4-wire cable, or what?
The connections run through the fuses to the two terminals at the bottom.
The outgoing wire is the white cable to the left. The red wire is connected
to the bottom right terminal, the green wire is connected to the bottom left
terminal. The yellow and black wires are wrapped around the white
(A second pair of red and green wires is also connected to these bottom
terminals. These run directly to a phone in the den, without going through
the network box.)
The white wire to the left runs back outside to a network interface box.
Here is a picture of the network interface box. Here is a picture:
Network Interface Device
The white line from the lightning protector comes in on the bottom right.
Note that the NID has two sides, one designated "Line 1", the other "Line
2". A set of 4 terminals - RGBY - is mounted on the Line One side.
QUESTION TWO. I can't tell from the picture - I'll have to go up on the
roof to make sure - is there a wire from the telco part of the box going to
each of these four terminals?
QUESTION THREE. You can see that the wire to the test jack has only two
wires, red and green. But isn't this part of the connection to the rest of
the house? After all, when you unplug the test jack, the phones in the
house go dead. And if this is part of the connection to the rest of the
house, why doesn't it have all four wires?
No terminals are mounted on the Line 2 side of the NID.
QUESTION FOUR. What will the phone company do with the network box to
a second line? (Assuming they don't replace the box.) Will they put RGBY
terminals on the Line 2 set of the box, and connect four wires to it?
QUESTION FIVE. Why have 4 terminals on the Line One side? Just to
establish a spare connection? If a spare connection is needed for each
line, should I run two wires out of the NID instead of just one?
My idea was to run the wire from the NID to a junction box in the attic, and
then to jacks in a star configuration.
I bought the RCA TP039 junction box, which says "add up to 4 telephone
extension lines". Shown here:
Here are the installation instructions, which have confused me a bit:
QUESTION SIX. There are two terminals for each wire color, and two in the
top of each terminal. I'm assuming that I can put one wire of each color
into each slot, for a total of four. Is this right?
QUESTION SEVEN. How should I connect the incoming wire? Should I insert
wires through one of the bottom slots on each terminal, or should I put the
wire under the screw?
Many thanks for your advice.