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If you don't have access to a point to point a serial connection at work just do a search in Google

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or your favorite search engine for Cisco CSU D issue as an example and you'll find many pictures showing

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you examples of setups using serial connections.

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Here's a very good one.

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It's an older picture showing a 17 20 Rada in the picture.

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Here you can see the blue console cable connecting to the console port of the rudder.

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You can see the power connection and what's important is to note the Ethernet connection.

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This would connect to the up to a switch or another device in the local area network and very importantly

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notice the V 35 cable.

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So we have one end of the cable connected to the router and the other end is connected to the C issue

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D issue.

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This is an example of an external C issue issue and you can see it's connected to the telco network.

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Now they use the term D Mark a D Mark is a demarcation point.

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This is where responsibility changes.

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So on one side of the D Mark or demarcation point any problems are the responsibility of the service

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provider.

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On the other side of the demarcation point any problems are yours.

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If you managing the local area network so you would be responsible as an example for configuring your

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router for making sure that the serial cable is connected correctly that the ethernet cable is connected

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correctly that these devices are powered up and so forth but once you send traffic to the service provider

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network that becomes the responsibility of the service provider.

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Now these days they see issue.

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The issue is often built in to the way an interface card or work.

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This is an example of a week or one interface card that you would insert in a router.

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Notice this one is a T1 issue C issue so the C issue D issues internal to the rudder.

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Here's another picture of the week card and here's another one showing it inserted into the rudder.

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So once again here's an example of the C issue D issue bolting to the rudder here's another example

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showing you the C issue.

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The issue with a DTV cable connected to the router providing an internet connection.

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Cisco also have images such as the following showing that a serial connection is connected to a card

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on the router which in turn connects you to the sea issue.

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DC.