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T-1 The easy definition is it is a circuit to the telephone company or internet provider that can handle a larger volume of traffic than a regular phone line.

A typical T-1 circuit can be broken into 24 individual voice channels or configured as a full 1.544 megabits per second data channel to the internet or another computer system.

                                                                                                                                                                                                                                                  PRI  The easy answer is a circuit that carries voice and caller id information into a digital phone system.

A Primary Rate Interface typically has 23 voice channels and a data (D) channel.  By using a pri circuit calls can be processed faster and more efficiently by a telephone processor.

Your phone provider can tell you if this will benefit your business as well as whether your system has the capability to use a PRI circuit.

A typical installation will require your phone switch to have the capability to use a PRI Circuit and transform the calls from digital to voice, process data for caller id functions etc.



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Dynamic T-1.  The easy answer is a T-1 for Internet access that only uses channels for voice when a call is in progress.

Most carriers now use Dynamic T-1 service to send all calls as voip calls, which allows full utilization of the T-1 circuit as an internet access circuit when there are no calls in progress.  The carrier can deliver the voice portion as a PRI, Super trunk, or analog lines by installing an access device to transform the data to voice for your phone switch. 

This allows you to use your current phone switch without the expense of voip telephones or voip telephone switches.



The easy definition of a bonded T-1 is a combination of two or more t-1 circuits into a single large circuit to allow for higher speed and larger usage.  At the customer premise a special type of router will be provided to allow the customer to use both t-1 circuits at the samer time.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                


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                                          DS-3  The easy answer is it is a data channel that is capable of carrying 28 T-1 circuits on a single data circuit.
A DS 3 circuit  is a data circuit that carries 44.76 mbps and is commonly refered to as a 45 meg circuit.
                             DIA Direct Internet Access.  The easy answer is it is an internet access circuit that is always on.   The     circuit that provides this could be a dsl. t-1, cable dsl, ds3, or satellite circuit.
VOIP   the easy definition is a way to transmit telephone calls over the internet. 

Voice Over Internet Protocal changes voice to data and sends packets over the internet and at the other end changes them back to analog voice. 

The mistake people make is thinking all internet connections will work well with voip.  The problem is that each call uses between 60 to 80 kilobits and many dsl and factional t-1 circuits do not have enough bandwidth to carry the voice transmission.
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