AT&T 2500 series, 7500 series, 7100 series, 7200 series manual Table D-1.Some Ccitt Digital Standards

D-6COMMUNICATIONS PROTOCOLS

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Table D-1.Some CCITT Digital Standards

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⎜	⎜		⎜		⎜
⎜ Name	⎜	Title	⎜	Equivalent	⎜
⎜	⎜		⎜	Standard(s)	⎜
⎜	⎜		⎜		⎜
⎜	⎜		⎜		⎜
⎜ X.1	⎜ International user classes of service in public data networks		⎜ ANSI X3.1; RS-269-B; FED-STD		⎜
⎜	⎜		⎜	1001; FIPS 22-1	⎜
⎜	⎜		⎜		⎜
⎜	⎜	International user services and facilities in public networks	⎜	INT-FED-STD 0001041	⎜
⎜ X.2	⎜		⎜		⎜
________________________________________________________________________________________________________					⎜
⎜	⎜		⎜
⎜	⎜		⎜		⎜
⎜ X.4	⎜	General structure of signals of international alphabet no. 5 code for	⎜	CCITT V.4; ISO 1155; ANSI X3.15;	⎜
⎜	⎜	data transmission over public data networks	⎜	FED-STD 1010; FIPS 16-1	⎜
________________________________________________________________________________________________________					⎜
⎜	⎜		⎜
⎜ X.20	⎜	Interface between data terminal equipment (DTE) and data circuit-	⎜	None.	⎜
⎜	⎜	terminating equipment (DCE) for synchronous operation on public	⎜		⎜
⎜	⎜		⎜		⎜
⎜	⎜	data networks	⎜		⎜
________________________________________________________________________________________________________					⎜
⎜	⎜		⎜
⎜	⎜		⎜		⎜
⎜ X.20bis	⎜	Use on public data networks of DTE which is designed for	⎜	RS-232C	⎜
⎜	⎜	interfacing to asynchronous duplex V.series modems	⎜		⎜
________________________________________________________________________________________________________					⎜
⎜	⎜		⎜
⎜ X.21	⎜	Interface between DTE and DCE for circuit-switched synchronous	⎜	None.	⎜
⎜	⎜	operation on public data networks	⎜		⎜
⎜	⎜		⎜		⎜
⎜	⎜		⎜		⎜
⎜ X.21bis	⎜	Use on public data networks of DTE which is designed for	⎜	RS-232C; RS-449	⎜
⎜	⎜	interfacing to synchronous duplex V.series modems	⎜		⎜
________________________________________________________________________________________________________					⎜
⎜	⎜		⎜
⎜	⎜		⎜		⎜
⎜ X.25	⎜	Interface between DTE and DCE for terminals operating in the	⎜	INT-FED-STD 001041	⎜
⎜	⎜	packet mode on the public data networks	⎜		⎜
________________________________________________________________________________________________________					⎜
⎜	⎜		⎜
⎜ X.27	⎜	Electrical characteristics for balanced double-current interchange	⎜	CCITT V.11; RS-422A; FED-STD	⎜
⎜	⎜	circuits for general use with integrated circuit equipment in the field	⎜	1020A	⎜
⎜	⎜		⎜		⎜
⎜	⎜ of data communications		⎜		⎜
⎜	⎜		⎜		⎜
⎜ X.28	⎜ DTE/DCE interface for a start-stop mode data terminal equipment		⎜ None.		⎜
⎜	⎜	accessing packet assembly/disassembly facility (PAD) in a public	⎜		⎜
⎜	⎜	data network situated in the same country	⎜		⎜
⎜	⎜		⎜		⎜
⎜ X.29	⎜	Procedures for the exchange of control information and user data	⎜	None.	⎜
⎜	⎜	between a packet assembly/disassembly facility (PAD) and a packet	⎜		⎜
⎜	⎜		⎜		⎜
⎜	⎜ mode DTE or another PAD		⎜		⎜
⎜	⎜		⎜		⎜
⎜ X.75	⎜ Terminal and transit call control procedures and data transfer system		⎜ None.		⎜
⎜	⎜	on international circuits between packet-switched data networks	⎜		⎜
⎜	⎜		⎜		⎜
⎜ X.96	⎜	Call progress signals in public data networks	⎜	INT-FED-STD 001041	⎜
⎜	⎜		⎜		⎜
⎜ X.400	⎜	Defines the model for the overall message handling environment (for	⎜	None.	⎜
⎜	⎜		⎜		⎜
⎜	⎜ OSI layers 4-7)		⎜		⎜