3Com 3C780 User Guide - Page 29
The FDDI standard developed by the American National Standards Institute
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Ring wrap Overview 1-3 Break in ring or station failure Ring wrap Primary ring Secondary ring Figure 1-1. Ring Wrap The FDDI standard developed by the American National Standards Institute (ANSI) defines four protocols: s Physical Medium Dependent (PMD) s Physical (PHY) s Media Access Control (MAC) s Station Management (SMT) Each of these protocols is briefly defined below.
![](/manual_guide/products/3com-3c780-user-guide-1cbee3e/29.png)
1-3
Overview
Primary ring
Secondary ring
Ring wrap
Ring wrap
Break in ring or station failure
Figure 1-1.
Ring Wrap
The FDDI standard developed by the American National Standards Institute
(ANSI) defines four protocols:
■
Physical Medium Dependent (PMD)
■
Physical (PHY)
■
Media Access Control (MAC)
■
Station Management (SMT)
Each of these protocols is briefly defined below.