Speaker 1: Welcome to Brainstuff from house Stuff Works dot com where
Speaker 1: smart happens. Hi Am Marshall Brain with today's question. In
Speaker 1: our office, we have a T one line. What is
Speaker 1: a T one line and how does it work? Most
Speaker 1: of us are familiar with a normal business or residential
Speaker 1: line from the cable company, but in many business settings,
Speaker 1: internet connections often come in in the form of something
Speaker 1: called a T one line. The phone company moves nearly
Speaker 1: all voice traffic as digital rather than analog signals. Your
Speaker 1: analog line gets converted to a digital signal by sampling
Speaker 1: it at eight thousand times per second at eight bit
Speaker 1: resolution or sixty four thousand bits per second. Nearly all
Speaker 1: digital data now flows over fiber optic lines, and the
Speaker 1: phone company uses different designations to talk about the capacity
Speaker 1: of all these different fiber optic lines. If your office
Speaker 1: has a T one line, it means that the phone
Speaker 1: company has brought a dedicated copper or fiber optic line
Speaker 1: into your office. A T one line can carry twenty
Speaker 1: four digitized voice channels, or it can carry data at
Speaker 1: a rate of one point five megabits per second. If
Speaker 1: a T one line is being used for telephone conversations,
Speaker 1: it plugs into the office's phone system. If it's carrying data,
Speaker 1: it plugs into the network's router. A T one line
Speaker 1: tends to be extremely reliable. Depending on what they're doing.
Speaker 1: A T one line can generally handle quite a few people.
Speaker 1: For general browsing, dozens or hundreds of users are easily
Speaker 1: able to share a T one line comfortably. Here are
Speaker 1: some of the other common line designations used by the
Speaker 1: phone company. A D S zero line is a normal
Speaker 1: voice channel. It's sixty four kilobits per second, and I
Speaker 1: S D N line is two DS zero lines plus
Speaker 1: some signaling. A T one line is one point five
Speaker 1: megabits per second, a T three line is twenty eight
Speaker 1: t ones or forty three megabits per second, and O
Speaker 1: C three line is a D four t ones or
Speaker 1: one and fifty five megabits per second, and O C
Speaker 1: twelve is four O C threes or six hundred twenty
Speaker 1: two megabits per second, and O C forty eight is
Speaker 1: four O C twelves or two and a half gigabits
Speaker 1: per second, and an O C one nine two is
Speaker 1: four O C forty eight and that's nine point six
Speaker 1: gigabits per second. In other words, and o C one
Speaker 1: two can handle about a hundred and fifty thousands simultaneous
Speaker 1: phone calls or the data for a very large website.
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