In a modular jack, there are four wires.

Take a modular jack and look at the bottom of it's casing.

Now insert your telephone's modular plug into the modular jack.

This is a 6 pin modular jack where the key is offset from the center position.

Most places don't use modular jacks like we do here.

The network interface is essentially a modular jack where the phone company's wiring ends and yours begins.

That is because so many homes and apartments have modular jacks.

Most customers who had Princess telephones were converted to modular jacks.

How do I connect the modular jack to the wires color-to-color?

Converting to modular jacks makes it easy to unplug and move phones.