||1. X.25 is a very old protocol, and widely implemented.
However, it is hard to find any new implementations.
2. X.25 implements node-to-node error correction, and very suitable for
noisy circuits. A severe drawback is high overhead, and transmission
|1. Frame Relay is widely implemented these days. Frame Relay
does not support any node-to-node error correction. With the advent of
highly reliable physical channels, node-to-node error correction (offered
by X.25) is considered to be out-of-date, and not essential.
2. Revised specifications for Frame Relay network support LMI
extensions. These include: global addressing, virtual circuit status
messages, and multicasting