If no other user is transferring data then maximum (128 Kbps) bandwidth would be available.For example if no other user is transferring data at any specific time then R1 is allowed to use additional 64Kbps bandwidth at that particular time. If no other user is transferring data at any specific time then they will get a maximum bandwidth of 128 Kbps on that time. If all other users are transferring data at any particular time then they will get a minimum bandwidth of 64Kbps at that time. Additional bandwidth will be provided on share basis. They will be charged for 64Kbps guaranteed (CIR) + additional bandwidth (if available under certain terms and conditions). For this connection they have to spend a little extra money. Instead of fix bandwidth, network1 and network2 opt for a flexible connection where access rate and CIR rate is different. So for network3 this connection will work just like a leased line of 64Kbps where you will get what you will pay for. Network3 is paying for 64Kbps speed and in return, getting a guaranteed speed of 64Kbps from frame relay company. If access rate and CIR rate is equal then Frame relay connection is pretty much works like a leased line. Network3 purchased connection with access rate of 64Kbps and CIR of 64 Kbps. Network1 and Network2 purchased a connection with access rate of 128Kbps and CIR of 64 Kbps. Suppose, there are three networks connected with a frame relay switch sharing single path. Let’s understand these value with an example. ![]() CIR is the maximum bandwidth at which data will be delivered guaranteed. In congestion we could be sure about this bandwidth. This is the guaranteed bandwidth that we will get from provider for a VC. Access rate is the maximum speed at which data can be transmitted. ![]() ![]() Access link should be clocked on this speed. This is the maximum speed of purchased connection. VCĪ VC is the logical path between two endpoint DTEs. Frame Relay cloudįrame Relay cloud refers Telco companies internal infrastructure. Access LinkĬonnection line between DTE and DCE. DCEĭCE ( Data circuit terminating equipment) is a device (usually modem, CSU/DSU or Frame Relay switch) that provides clock rate and synchronization. DSL and cable modems are the example of CSU/DSU. LAN network and WAN network uses separate communication technology. CSU/DSUĪ CSU/DSU ( Channel Service Unit/Data Service Unit) is a device that converts data signal between LAN network and WAN network. Have a look on following figure that illustrate a simple Frame Relay networkĭTE ( Data Terminal Equipment) is a device (usually a router or PC) that converts data frame into signals and reconvert received signals in data frame. In this section we will understand these terms in detail. When all sites do not have direct link with each other then it would be considered as partially meshed frame relay network.įrame Relay uses a lot of terms to describe its components and functions. Frame Relay Network TypeĪ frame relay network is considered fully meshed when all sites (routers) are connected with each other via direct link. After this wherever VC or PVC is referred please take that for PVC only. So I am not going to include it in rest of the article. SVC is not tested in any CCNA level exam. Differences between Frame Relay PVCs and Frame Relay SVCs There are two types of VCs PVCs and SVCs. In Frame Relay terminology virtual connection lines are known as Virtual Circuits (VCs). This part provide step by step guide on how to configure Frame Relay in Cisco routers. This tutorial is the last part of the article. How to configure Frame Relay Step by Step Guide This part explains PPP (Point to Point) protocol and encapsulation method in detail with examples including step by step configuration guide. This tutorial is the third part of the article. PPP Protocol and Encapsulation method Explained This part explains HDLC (High-Level Data Link Control) protocol and encapsulation method in detail with examples including step by step configuration guide. This tutorial is the second part of the article. HDLC Protocol and Encapsulation method Explained ![]() This part explains basic wan concepts including terminology, encapsulation methods, switching concepts and encapsulation protocols in detail with example. This tutorial is the first part of article. WAN Tutorial – Basic WAN Switching Concept Explained You can read other parts of this article here. This tutorial is the fourth part of our article “WAN Terminology Explained with Encapsulation Protocols and Methods”.
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