[NISTIR 90-4267] This report describes a conformance test for the Fiber Distributed Data Interface (FDDI) Medium Access Control (MAC) standard [1]. FDDI is a layered OSI protocol consisting of four sublayers at the data link or physical layers as illustrated in Figure 1. At the lowest level is Physical Medium Dependent (PMD) standard [2], which is concerned primarily with the optical fiber interface to FDDI stations. The Physical Layer Protocol (PHY) standard [3] deals with the coding of data and control symbols. The MAC sublayer, which is a data link layer protocol, is concerned with the definition of frames (packets), and the token passing mechanism used to grant permission to transmit frames. Figure 2 illustrates the MAC frame and token formats. MAC interfaces with a Logical Link Control (LLC) sublayer, typically IEEE 802.2, above it. Finally Station Management (SMT) [4] is a vertical management sublayer, which manages the other three sublayers and provides an interface to the OSI System Management Application (SMAP) process. Together these four sublayers specify the physical interface and data link protocol for a node in a 100 Mbit/s fiber optic token ring LAN network, which supports OSI communications. It is similar to the IEEE 802.3, 802.4 and 802.5 protocols in its services, and is logically interchangeable with them under the 802.2 LLC.
[NISTIR 90-4267] This report describes a conformance test for the Fiber Distributed Data Interface (FDDI) Medium Access Control (MAC) standard [1]. FDDI is a layered OSI protocol consisting of four sublayers at the data link or physical layers as illustrated in Figure 1. At the lowest level is...
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[NISTIR 90-4267] This report describes a conformance test for the Fiber Distributed Data Interface (FDDI) Medium Access Control (MAC) standard [1]. FDDI is a layered OSI protocol consisting of four sublayers at the data link or physical layers as illustrated in Figure 1. At the lowest level is Physical Medium Dependent (PMD) standard [2], which is concerned primarily with the optical fiber interface to FDDI stations. The Physical Layer Protocol (PHY) standard [3] deals with the coding of data and control symbols. The MAC sublayer, which is a data link layer protocol, is concerned with the definition of frames (packets), and the token passing mechanism used to grant permission to transmit frames. Figure 2 illustrates the MAC frame and token formats. MAC interfaces with a Logical Link Control (LLC) sublayer, typically IEEE 802.2, above it. Finally Station Management (SMT) [4] is a vertical management sublayer, which manages the other three sublayers and provides an interface to the OSI System Management Application (SMAP) process. Together these four sublayers specify the physical interface and data link protocol for a node in a 100 Mbit/s fiber optic token ring LAN network, which supports OSI communications. It is similar to the IEEE 802.3, 802.4 and 802.5 protocols in its services, and is logically interchangeable with them under the 802.2 LLC.
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