About T-carrier tech Flashcards
who invented T-carrier tech?
At&T
Why were t-carrier tech invented?
to provision a system that allowed lots of phone calls to travel across a single cable.
What was the first t-carrier specification called?
T1, Transmission system 1.
How many simultaneous phone calls could T1 carry across a single piece of twisted pair copper?
up to 24.
What technology was repurposed for data transfers?
T1
How many kilobits per second could each of the 24 phone channels transmit?
64
How much data could a T1 line, for data transfer, transfer?
1.544 megabits per second
What does t1 mean now?
any twisted pair copper connection capable of speeds of 1.544 megabits per second, even if it doesn’t follow the original Transmission system 1 specification.
What was t1 tech originally used to do?
connecting different telecom company sites to each other, and to connect these companies to other companies.
How were improvements to the t1 line made?
by developing a way of multiple t1s, to act as a single link.
A T3 line is
28 T1s, all multiplexed, achieving a throughput speed of 44.736 megabits per second.
T-carriers are still
in use today, but have largely been surpassed.
What is more common now?
cable broadband and fiber
For inner ISP communications,
Fiber technologies have all replaced older copper based ones.
