Understanding Your Network Interface Device

The Network Interface Device (NID) located on the outside of your house is the demarcation point between your home phone wiring and the telephone company. 

The box is divided into a customer access side and a telephone company access side. You can access the customer access side using a flat head screw driver.

HOW IT WORKS

A CAT-5e cable runs from the distribution panel in your basement to the customer access side of the Network Interface Device (blue wire in the lower-left of the  above image). A single pair from the CAT-5e cable is connected to a terminal on a wiring bridge module.

The image below shows the customer side of the network interface device. It shows three (3) wiring bridge modules and the CAT-5e cable that runs to your distribution panel. Line #1 (blue) is wired to the top wiring bridge module. The test jack can be seen on the left side of the wiring bridge module (open in the image below). 

The three remaining phone lines (orange, green and brown) are wraped around the Cat-5 cable to keep them out of the way. Separated, they would look like this;

. . . CAT-5e Cable (4 pair) (one pair/line)

The 'Inside Connection'

The blue lines (note the blue stripe on the white line) are simply inserted into the top connector (Tip - Striped, Ring - Solid) and pressed into place. (This is what Verizon charges you $110 for an 'inside connection')