AT&T DEFINITY 2500 series Network Manual page 282

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.
OSI
7. Application File transfer
access and
management
(FTAM)
6. Presentation Virtual
terminal
protocols
(VTP)
5. Session ISO Session
4. Transport ISO Transport
3. Network ISO
Internetwork
protocol (IP)
2. Data Link
1. Physical
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)
Table D-4. Some Well-Known Protocol Standards
ISO CCITT
X.400
ISDN
X.25
X.21
DOD IEEE 802
File transfer
protocol (FTP)
SMTP
TELNET
Transmission
control
protocol (TCP)
Internetwork
protocol (IP)
Logical link
control
Medium access
control
Physical
EIA
RS-232C
RS-449
RS-366