So this is once again an example of an external CCU DSU connected using a v 35 cable to a router.
Here's an example with the WHIC card having the CCU DSU built in.
So what's the built in CCU dsu such as a wicker one?
DSU DT one.
The card would be used to connect to either PT one or fractional PT one connections.
The advantage of using this card over an external CCU DSU is that you have fewer devices and cables
to deploy and manage.
It also allows you to remotely configure, monitor and troubleshoot using the well-known Cisco CLI.
And it obviously saves some space because you have fewer devices.
So in many cases in the United States, people would use the bolt in AC DC, but in other parts of the
world you may still be required to use an external CCU DC.
So what are some of the advantages of a leased line?
Well, firstly, it's very simple to configure.
You can get a lease line up and running with just a few commands.
So it's very simple to install and maintain point to point.
Lease lines also offer a high quality of service, provided that there's adequate bandwidth for the
traffic traversing the link.
In other words, the bandwidth of the connection is dedicated to you and you alone.
No one else will be able to use the bandwidth on that circuit.
You are typically paying a monthly charge for the leased line and the bandwidth on that leased line
is dedicated to you alone.
The connection is also permanent, so you don't have to try and set it up every time you send traffic.
The bandwidth is there and they're always for you to use.
The major disadvantage of the lease lines, however, is normally the cost of the leased line.
Now, if you've only got two sites, the cost may not be that great.
However, if you've got ten sites that you need to connect in a full mesh.
In other words, every site needs to be connected to every other site.
The cost can become very prohibitive as there's an exponential increase in the cost as you add more
and more sites.
That's one of the reasons that small, medium businesses today prefer to use DSL connections with VPNs
rather than using leased lines and large businesses when making connections to remote branch offices
may also prefer to use the Internet with DSL as the local connection type.
With VPNs overlayed across the Internet, it's a lot, lot cheaper, especially when you have many,
many sites.
Another problem is you are charged for the bandwidth, whether you use it or not.
So as an example, if you've got a two megabits per second circuit or two megabits per second, at least
line, you are charged a monthly fee for that last line whether you use the bandwidth or not.
If you only using some of the bandwidth, some of the time you are paying for bandwidth that you don't
use.
So that's another disadvantage of at least line.
You also have no ability to burst or go above the fixed limit of two megabits per second.
You are limited to the speed of the link.
The bandwidth is yours to use all the time, but you can't go above the speed of the least line.