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Packet Switching and X.25 Networks. Page 208
The use of X.21 is very limited despite being referred to in X.25, and
there are only a small number of modems and other items of equipment
that use it. A second recommendation, X.21 bis, defines an X.21 type of
service but using the normal V.24, V.28, and ISO 2110 interface. This
allows existing modems and wiring to be used, but gives the benefits of
the X.21 approach.
Recommendations X.20 and X.20 bis are similar to X.21 and X.21
bis but for asynchronous data.
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Packet Switching and X.25 Networks
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