Talk:X.21

= 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)

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

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