AT&T 7500 series, 7100 series, 2500 series, 7200 series, 7400 series, 7300 series AT&T Protocols, Eia

D-10COMMUNICATIONS 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 1-4for the names of some protocols that are commonly used at specific ISO layers.

Table D-4.Some Well-Known Protocol Standards

________________________________________________________________________________________________

⎜

OSI

⎜

ISO

⎜

CCITT

⎜

DOD

⎜

IEEE 802

⎜

EIA

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

7. Application

⎜

File transfer

⎜

⎜

File transfer

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

access and

⎜

⎜

protocol (FTP)

⎜

⎜

⎜

⎜

⎜

management

⎜

⎜

SMTP

⎜

⎜

⎜

⎜

⎜

(FTAM)

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

X.400

⎜

_______________⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

6. Presentation

Virtual

TELNET

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

terminal

⎜

⎜

⎜

⎜

⎜

⎜

⎜

protocols

⎜

⎜

⎜

⎜

⎜

⎜

⎜

(VTP)

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

5. Session

⎜

ISO Session

⎜

⎜

Transmission

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

control

⎜

⎜

⎜

⎜

4. Transport

⎜

ISO Transport

⎜

⎜

protocol (TCP)

⎜

⎜

⎜

________________________________________________________________

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

3. Network

⎜

ISO

⎜

⎜

Internetwork

⎜

⎜

⎜

⎜

⎜

Internetwork

⎜

⎜

protocol (IP)

⎜

⎜

⎜

⎜

⎜

protocol (IP)

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜ 2. Data Link

⎜

⎜

ISDN

⎜

⎜

Logical link

⎜

⎜

⎜

⎜

⎜

⎜

⎜

control

⎜

⎜

________________

⎜

⎜

⎜

________________________________

⎜

⎜

X.25

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

1. Physical

Medium access

RS-232C

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

X.21

⎜

⎜

control

⎜

RS-449

⎜

⎜

⎜

⎜

⎜

⎜

Physical

⎜

RS-366

⎜

⎜

⎜

⎜

⎜

⎜

⎜

⎜

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)