How to Get All Your Home Phones Working With Comcast Digital Voice. Comcast Digital Voice, or CDV as they like to call it, has certainly made an impact on the home phone service industry. Digital quality, no static, the ability to surf online and talk on the phone simultaneously. These are just a few of the reasons thousands are switching over to the largest cable company's phone service.
But, when the technician comes to install it, many customers discover that Comcast uses contractors to do their installations, and some of these guys can barely tell a broadband modem from a digital converter box. What winds up happening in many cases, is that after installation, customers realize that just one of their phones is working and it is plugged directly into the back of the CDV modem. Here's how to get the rest of your phones working without waiting for another contractor to come out and mess things up even worse.
When you look at the back of a Comcast CDV modem, you will see where the phone jacks are located. The goal of this job is to get a phone line from the "line 1" output jack on the CDV modem to one of your home's existing phone jacks.
The first thing you will want to do is to make sure that the technician disconnected your phone wires in your phone box on the side of your home. This is a step that they routinely miss and it can cause all kinds of quality issues.
Locate the box, open it, and if you look in the lower left-hand corner, you will see a phone jack. Simply pull the phone plug out of the jack. Close up the box and head back inside.
The length of phone wire you are going to need for this job is determined upon the distance to the nearest phone jack. When you purchase the phone line, make sure that the ends of it have terminal plugs on them.
There are two ways to run the phone line to the nearest available phone jack: inside the wall and externally.
You can use a wire fish and run the phone line through the walls, or if the phone jack is in the same room or a room nearby, you can just staple the phone line to the baseboard and run it externally around the perimeter. Be sure to use insulated staples if you choose this route.
If you choose to run it externally, then all you have to do is plug one end of the phone line into the "line 1" output on the back of the CDV modem and plug the other end into the wall jack.
Make sure that the CDV modem is turned on and connected to the coaxial cable line. If you pick up the receiver on one of your phones, you should hear a dial tone.
If you plan on running the phone line through the wall, then that job requires a little more work. The first thing you will have to do is locate the phone jack you are going to tie into.
Remove the phone jack from the wall by unscrewing the two screws securing it to the wall box. Carefully pull it out of the wall.
Next, depending on how far you are running the phone line, you will have to use the metal wire fish to pull the phone line through the wall. If the run is far, then you will probably have to cut some access holes in your walls using a drywall saw.
Once you get the phone line running through the wall and into the open wall box, you will have to cut the terminal plug off and separate the wires.
If you look at the back of the existing phone jack, you will notice four colored wires (red, green, black and yellow).
Carefully strip about 1/2 inch of insulation off of the wires in the new phone line. Then, simply connect each wire to the terminal on the back of the existing phone jack. Connect like color to like color (black to black, yellow to yellow, etc.).
Once all of the wires are connected to the right terminals, resecure the phone jack to the wall box using the screws you removed earlier.
Back at the Comcast CDV modem, plug the other end of the phone line into the "line 1" output portal. Make sure that the coaxial cable is connected to the modem and that it is turned on and you are getting a dial tone on each of your home's phones.
That is all there is to it. Now you won't have to run across the house every time the phone rings!