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D-10 COMMUNICATIONS PROTOCOLS
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• ADCCP (Advanced data communications control procedures) — A protocol developed by ANSI, and
later adopted by the National Bureau of Standards, the Federal Communications Standards Committee,
and the Defense Department. There are virtually no differences between HDLC and ADCCP.
See Table 1-4 for the names of some protocols that are commonly used at specific ISO layers.
Table D-4. Some Well-Known Protocol Standards
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OSI ISO CCITT DOD IEEE 802 EIA
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7. Application File transfer
access and
management
(FTAM)
File transfer
protocol (FTP)
SMTP
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X.400
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6. Presentation TELNET Virtual
terminal
protocols
(VTP)
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5. Session ISO Session Transmission
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control
4. Transport ISO Transport protocol (TCP)
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3. Network ISO
Internetwork
protocol (IP)
Internetwork
protocol (IP)
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2. Data Link ISDN Logical link
control
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X.25
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1. Physical
X.21
Medium access
control
Physical
RS-232C
RS-449
RS-366
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Adapted from: Data and Computer Communications, by William Stallings, Macmillan Publishing Co., N.Y., 1988
AT&T PROTOCOLS
AT&T has created standard communications protocols of its own. In addition, it has adapted and renamed
other standards to more closely meet the needs of its networks and customers. Among the AT&T protocols
are:
• Digital multiplexed interface (DMI)
• Basic rate interface (BRI)
• Primary rate interface (PRI)
• Digital communications protocol (DCP)