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Current usage in Europe/Japan
editDoes 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
editNeed a section on X.21bis and what the exact differences are.