Packet networks come in two basic flavors: datagram or virtual circuit . Today, Mark is going to walk you through the definition of a virtual circuit, and examples of places where you can find them. You can listen to (or download) the PodSnack by clicking Read More...

Sometimes, I am amazed at the number of very basic concepts that we simply have not talked about in this series. One of those jumped out at me as I was doing some update work on our wiki . We use the term frame all of the time, but we have never really Read More...

We have several packet network technologies that work on the virtual circuit model. These include both frame relay and ATM . In these networks we distinguish between permanent virtual circuits (PVC) and switched virtual circuits (SVC). Today's PodSnack Read More...

A couple of days ago we talked about the committed information rate (CIR) that is assigned to a frame relay virtual circuit (VC). There is another parameter assigned to the VC: the excess information rate (EIR). This parameter controls the burst tolerance Read More...

We've spent a couple of PodSnacks on frame relay , but we've never really taken a look at the customer end of the frame relay user-to-network interface (UNI). The device that is placed out there is generically referred to as a frame relay access Read More...

Staying with the theme of frame relay , today we're going to spend a bit of time on congestion notification and congestion management. Specifically, we're going to look at the notification component, which can be accomplished using the Forward Read More...

OK - so I got sick of themes for one day! I looked through my little library of PodSnacks and found I had a few on frame relay . Now you might be tempted to say that this is a waste of time because frame relay is a legacy technology or service, but it Read More...

Packet networks come in two basic flavors: datagram or virtual circuit . Today, Mark is going to walk you through the definition of a virtual circuit, and examples of places where you can find them. You can listen to (or download) the PodSnack by clicking Read More...