AT&T DEFINITY 2500 series Network Manual page 278

D-6
COMMUNICATIONS PROTOCOLS
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Name
X.1 International user classes of service in public data networks
X.2 International user services and facilities in public networks
X.4 General structure of signals of international alphabet no. 5 code for
data transmission over public data networks
X.20 Interface between data terminal equipment (DTE) and data circuit-
terminating equipment (DCE) for synchronous operation on public
data networks
X.20bis Use on public data networks of DTE which is designed for
interfacing to asynchronous duplex V.series modems
X.21 Interface between DTE and DCE for circuit-switched synchronous
operation on public data networks
X.21bis Use on public data networks of DTE which is designed for
interfacing to synchronous duplex V.series modems
X.25 Interface between DTE and DCE for terminals operating in the
packet mode on the public data networks
X.27 Electrical characteristics for balanced double-current interchange
circuits for general use with integrated circuit equipment in the field
of data communications
X.28 DTE/DCE interface for a start-stop mode data terminal equipment
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
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
on international circuits between packet-switched data networks
X.96 Call progress signals in public data networks
X.400 Defines the model for the overall message handling environment (for
OSI layers 4-7)
Table D-1. Some CCITT Digital Standards
Title Equivalent
Standard(s)
ANSI X3.1; RS-269-B; FED-STD
1001; FIPS 22-1
INT-FED-STD 0001041
CCITT V.4; ISO 1155; ANSI X3.15;
FED-STD 1010; FIPS 16-1
None.
RS-232C
None.
RS-232C; RS-449
INT-FED-STD 001041
CCITT V.11; RS-422A; FED-STD
1020A
None.
None.
None.
INT-FED-STD 001041
None.