Q103954: Protocol Standards Defined by IEEE Project 802 and FDDI

Article: Q103954
Product(s): Windows for Workgroups and Windows NT Networking Issues
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Last Modified: 30-JUL-2001

IEEE STANDARD 802 FOR LOCAL AREA NETWORKS

Recognizing a need for standards in the LAN market, the Institute
of Electrical and Electronics Engineering (IEEE) undertook Project
802. Named for the year and month ('80 Feb) of its inception,
Project 802 defined a family of low-level protocol standards at
physical and data link layers of the OSI model.

In IEEE 802 terms, the OSI data link layer is divided into two
sublayers: logical link control (LLC) and media access control
(MAC).

The data link layer functions allocated to the LLC sublayer are:

- Link establishment and termination

- Frame traffic control

- Frame sequencing

- Frame acknowledgment

The data link layer functions allocated to the MAC sublayer are:

- Frame delimiting

- Frame error checking

- Media access management

The low-level protocol standards defined by IEEE project 802
include 802.3 CSMA/CD, 802.4 token bus, and 802.5 token ring.
These standards differ at the physical layer and media access
control sublayer, but are compatible at the logical link
control sublayer.

The 802 standards have been adopted by:

- ANSI as American national standards

- NBS as government standards

- ISO as international standards (known as ISO 8802)

PROJECT 802 OVERVIEW

- 802.1--overview of project 802, including higher layers and internetworking

- 802.2-logical link control (LLC)

- 802.3-carrier sense multiple access with collision detect (CSMA/CD), very
  similar to Ethernet

- 802.4-token bus

- 802.5-token Ring

- 802.6-metropolitan area network

- 802.7-broadband technology advisory group

- 802.8-optical fiber technology advisory group

- 802.9-voice/data integration on LANs

- 802.10-standard for interoperable LAN security

ANSI FDDI STANDARD

Closely related to the IEEE 802 standards is a more recently
developed low-level protocol standard known as fiber distributed
data interface(FDDI) developed by the American National
Standards Institute (ANSI) and based on the use of fiber optic
cable.

FDDI differs from the IEEE 802 standards at the physical layer and
MAC sublayer, but is compatible with the IEEE standards at the LLC
sublayer.

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