1
00:00:01,100 --> 00:00:07,580
Now as mentioned VPN or virtual private networks have replaced a lot of deployments of leased lines

2
00:00:07,820 --> 00:00:09,590
but you'll still find them.

3
00:00:09,590 --> 00:00:11,900
They've been around for a very long time.

4
00:00:12,200 --> 00:00:18,560
And depending where you on the world this may be the only way to get a high speed connection to a business

5
00:00:18,560 --> 00:00:19,750
site.

6
00:00:19,790 --> 00:00:24,560
Now because these have been around a long time and have been used in various parts of the world they

7
00:00:24,560 --> 00:00:28,210
often referred to with different terms or different names.

8
00:00:28,340 --> 00:00:35,030
So the first term is a leased line which once again implies that you are leasing the line from a provider

9
00:00:35,480 --> 00:00:40,600
you don't own the connection you are paying a monthly fee.

10
00:00:40,610 --> 00:00:46,160
In other words a monthly leasing fee to lease the line from the service provider which would typically

11
00:00:46,160 --> 00:00:51,400
be a telephone company or telco such as AT&T or British Telecom.

12
00:00:51,440 --> 00:00:57,030
So some terms that you may come across include leased circuit or leased line.

13
00:00:57,260 --> 00:01:00,110
These terms are often used interchangeably.

14
00:01:00,110 --> 00:01:06,800
A circuit refers to the actual electrical circuit between the two endpoints in the old days we used

15
00:01:06,800 --> 00:01:13,830
to have circuit switch networks where you'd make a telephone call between two sites and use an analog

16
00:01:13,830 --> 00:01:17,560
modem to send traffic between those two sites.

17
00:01:17,640 --> 00:01:25,410
So it was a circuit that was established for the duration of your telephone call a leased line however

18
00:01:25,410 --> 00:01:33,060
is a dedicated circuit between two sites so you don't have to make a call to send data across it.

19
00:01:33,090 --> 00:01:37,270
It's a permanent point to point connection between the two sites.

20
00:01:37,380 --> 00:01:41,400
You may also come across the term serial link or serial line.

21
00:01:41,400 --> 00:01:45,220
Once again these are used interchangeably and mean the same thing.

22
00:01:45,420 --> 00:01:54,120
The term serial in this case refers to the fact that the bits sent across the wire flow serially and

23
00:01:54,120 --> 00:02:00,770
that Rod is used serial interfaces to make the connection a point to point link or point to point at

24
00:02:00,780 --> 00:02:01,170
least.

25
00:02:01,190 --> 00:02:08,760
Line refers to the fact that you are making the connection between two points rather than between multiple

26
00:02:08,760 --> 00:02:10,140
sites at the same time.