12/16/2023 0 Comments Split horizon definitionThe circuits are virtual because there is no direct electrical connection from end to end. The connection through a Frame Relay network between two DTEs is a VC. In Frame Relay, the end of each connection has a number to identify it called a data link connection identifier (DLCI).Īny station can connect with any other simply by stating the address of that station and DLCI number of the line it must use. ** All that matters is that when any SPAN office wants to communicate with any other SPAN office, all it needs to do is connect to a virtual circuit leading to the other office. What happens in the cloud is really of no concern at this time. Examining the figure, you can see that SPAN’s offices all connect to the Frame Relay cloud over their respective local loops. Network providers save because there is less equipment to purchase and maintainĪ virtual circuit provides considerable flexibility in network design. Using dedicated lines would require more CSU/DSUs (one for each line) and more complicated routing and switching. Typically, a network provider can service 40 or more 56 kb/s customers over one T1 circuit. * The second reason for Frame Relay’s cost effectiveness is that it shares bandwidth across a larger base of customers. While in a dedicated-line model, customers use dedicated lines provided in increments of 64 kb/s, and Frame Relay customers can define their virtual circuit needs in far greater granularity, often in increments as small as 4 kb/s. With Frame Relay, customers only pay for the local loop, and for the bandwidth they purchase from the network provider. First, with dedicated lines, customers pay for an end-to-end connection, which includes the local loop and the network link. Unless circuits are already installed, connecting new sites typically requires new circuit installations and takes considerable time to implement.Ġ1ed8caf-9209-4c84-b62e-6dc9229fc729.JPG (image/JPG)įrame Relay is a more cost-effective option for two reasons. The leased-line design also limits flexibility. The service provider configures the Frame Relay switch, which helps keep end-user configuration tasks to a minimum.Ī dedicated line provides little practical opportunity for a one-to-many connection without getting more lines from the network provider.Įj: almost all communication must flow through the corporate headquarters, simply to reduce the cost of additional lines. In addition, configuring user equipment in a Frame Relay network is very simple.įrame Relay connections are created by configuring customer premise equipment (CPE) routers or other devices to communicate with a service provider Frame Relay switch. Historically, Frame Relay was used extensively as a WAN protocol because it was inexpensive compared to dedicated leased lines. Cisco’s acquisition of StrataCom in 1996 marked their entry into the carrier market. When Sprint first implemented Frame Relay in its public network, they used StrataCom switches. Today, it is also used over a variety of other network interfaces. 08c936b2-bba2-49d4-9de2-6bcbcf736a6b.JPG (image/JPG)Įric Scace, an engineer at Sprint International, invented Frame Relay as a simpler version of the X.25 protocol to use across Integrated Services Digital Network (ISDN) interfaces.
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