This article is rated Stub-class on Wikipedia's content assessment scale.
It is of interest to the following WikiProjects:

Computing: Networking

	This article is within the scope of WikiProject Computing, a collaborative effort to improve the coverage of computers, computing, and information technology on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.ComputingWikipedia:WikiProject ComputingTemplate:WikiProject ComputingComputing
???	This article has not yet received a rating on the project's importance scale.
	This article is supported by Networking task force.
	This article has been automatically rated by a bot or other tool as Stub-class because it uses a stub template. Please ensure the assessment is correct before removing the `\|auto=` parameter.

Current usage in Europe/Japan

Does anyone have any information on how many DATEX-networks are still running? In Sweden, the incumbent telco, Telia, shut down the service in 2003. /JTragardh (talk) 14:58, 11 July 2009 (UTC)Reply

X.21 and X.21bis

Latest comment: 7 years ago1 comment1 person in discussion

Need a section on X.21bis and what the exact differences are.

Chris Fletcher (talk) 12:53, 10 March 2019 (UTC)Reply

This page was redesigned at the edge.

A page that knows where it met you.

Talk:X.21

Current usage in Europe/Japan

X.21 and X.21bis