I own comcast digital cable ...?
Answers: mraudio hit many of the leading points but I thought I'd add a bit more detail.
First of all, adjectives three of your services come into your home over the coaxial cable. So if your cable line go out (for example, if it gets cut) later you lose everything--TV, internet, and telephone service.
Within that single coaxial cable, Comcast sends and receive signals over a wide decoration of frequencies. Just like a radio can pick up signals from multiple frequencies that it is tuned to, your digital box or cable modem can tune into different frequencies to display different channel on your television or to download information from the internet or to transmit someone else's voice to you over the receiver.
A much smaller part of the frequency spectrum is reserved for the "upstream" signal. This allows you to convey signals back to Comcast, for example to request video on emergency, to upload information to the internet or to transmit your voice over the telephone to someone else.
Since the frequencies for the different services are kept separate, you can keep under surveillance TV, surf the internet, and talk on the phone adjectives at the same time.
The Arris box have two functions from the user's point of view. It provides high-speed internet service and it provides receiver service. You may think that both of these are extraordinarily different services, but in reality the way that the box handle them is very similar.
Basically, adjectives the cable modem part of the box does is exceed IP packets vertebrae and forth between your computer or router and Comcast's network.
The multimedia terminal adapter part of the pack of the box converts the analog voice signals that your telephones use into packet of voice data and distribute them back and forth between your telephone and Comcast's network using similar technology to the cable modem.
The plus of Comcast's method over internet VoIP (like Yahoo or Vonage) is that (1) Comcast prioritizes voice data over everything else and uses a different member of the frequency spectrum on the cable for voice traffic, so that heavy use of the internet won't grounds your telephone to crap out and (2) Comcast uses its own introduce yourself to route voice data, not the public internet. This let them control quality to a better degree. It may also enjoy some privacy benefits.
Finally, the telephone wires in your house work in exactly impossible to tell apart way as they other did. However, note that they do not provide headset service to the Arris box, rather it is the other passageway around: the Arris box supplies the analog phone service over the telephone wires surrounded by the home to all of the other telephone.
As was pointed out, it's totally important to ensure that those wires are disconnected from the phone company's electrics running to your house. The current from the phone company can damage the Arris box, since it's not expecting it.
So to recap, if someone call you, the signal:
1) Comes in over the Public Switched Telephone Network to the Comcast's gridiron.
2) Is transmitted as IP data over Comcast's meet people to the coaxial cable running to your house and to the Arris box.
3) Is converted into an analog signal in the Arris box.
4) Is transmitted from the Arris box to your cell phone over the phone wiring contained by your house.
Hope that answers the question!
The cable modem have a VOIP (Voice Over Internet Protocol) adapter built inside it, that connects to a dedicated VOIP lattice within Comcast to provide you next to VOIP telephone service.
To use it, you involve to disconnect the phone company's main nurture line from your house electrical system at the service entrance (where the phone company has the major phone box for your house). This is VERY important, because if the nouns is left connected and get connected to service by the phone company, it could fry your equipment.
So, once your house is disconnected by the old telco nurture line, simply use a phone cord to plug your cable modem into any phone jack contained by the house. That will "energize" your home phone wiring near the VOIP phone signal, and your phones should all work as majority, but on the new service.
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