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Tip of the Day
Language: Web Development
Expertise: Beginner
Apr 15, 1997

How does Frame Relay compare with X.25?

Question:
How does Frame Relay compare with X.25?

Answer:
X.25 is a packet-switched technology, which implies that data is transmitted in units called packets. In many ways, X.25 can be considered the precursor of other packet-switched technologies such as frame relay.

One of the major distinguishing factors is error detection. In X.25, packets that are transmitted must be acknowledged, thereby confirming that successful transmission and delivery were completed. This extra process adds a performance overhead to X.25 which directly affects data transmission rates.

Frame relay does not perform error detection and correction; that task is left to a higher layer in the OSI reference model. This is possible because frame relay relies on digital transmission technology. Also, the bandwidth used is allocated by the Committed Information Rate (CIR) value defined on the Permanent Virtual Circuit (PVC).

Studies have shown that frame relay-based routers can process 10 times as many frames as routers relying on X.25, due to the above-mentioned reasons.

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