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• CCITT Rec. X.10 (11/1988) – CATEGORIES OF ACCESS FOR DATA TERMINAL EQUIPMENT (DTE) TO PUBLIC DATA TRANSMISSION SERVICES
• 1 Scope
• 2 General
• 3 Categories of access
  • 3.1 Direct connection to data transmission services provided by public data networks
  • 3.2 Switched connection to data transmission services provided by public data networks
  • 3.3 Direct connection to data transmission services provided by ISDNs (including through Terminal Adaptors)
  • 3.4 Switched connection to data transmission services provided by ISDNs (including through Terminal Adaptors)