Because voice communication uses more information to reproduce the person's tones and qualities over the line. Data is a digital signal composed of 1 & 0 - needing much less bandwidth.
Less than
Both T1 and T3 are standard digital telephone carriers. They are designed to multiplex voice channels. T1 has a data rate of 1.544 Mbps and T3 has a data rate of 44.736 Mbps. So the answer is t3.
Bandwidth is a measurement of data transfer usually associated with the Internet.
Digital telephone is a services where from you can get voice with data services.Like old POTS you can have only voice services which works at 64 kbps rate, while digital telephone uses at least 128 kbps or higher rate so you can have voice and data services same time on same line.
Transmit and receive voice and data communications.
T-1
A broadband connection has much wider bandwidth available to it than a standard telephone connection. Wider bandwidth allows more information to be modulated onto the carrier. It is called "broadband" because of this wider bandwidth.
Voice on the wall, data in a rack or cabinet. Unless you got IP phones, than you're all data.
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These cables are used in telephone lines to provide voice and data channels.
Bandwidth is something like a space; bandwidth is proportional to the signal rate. if the signal rate is low then the bandwidth is high and vice versa. bandwidth carry the amount of information in a specific time period.For example if 1 person travel in 1 car then bandwidth will increase or if 4 person travels in 1 car then bandwidth will decrease. :)
Data transfer rate (also called bandwidth)
These cables are used in telephone lines to provide voice and data channels.