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Graphics Interchange Format  |  1995-09-26  |  220KB  |  701x612  |  8-bit (138 colors)

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OCR: Network Physical-layer Standards FIGURE 1 Parameter Data Transmission System Limits (m) Node Limits Year Rate Cable Diameter Segment Network Nodes per Node Physical Layer Adopted (Mbps) Type (mm) Length Span Segment Spacing IEEE 802.3 (Ethernet): 10BASE5 1985 10 Coax 10 500 2.500 100 2.5 10BASE2 1987 10 Coax 5 185 925 30 0.5 TOBROAD36 1987 10 Coax 0.4-1.0 1.800 3,600 (1) 1BASE5 1987 1 UTF 0.4-0.6 500 2,500 1 10BASE-T 1987 10 UTF 0.4-0.6 100 500 - 100BASE-TX 13 100 UTP 5 0.4-0.6 100 210 100BASE-T4 (3) 100 UTP 3-5 100 FOIRL 1987 10 Fiber 1,000 1 10BASE-FL 1994 10 Fiber 2.000 (1) 10BASE-FB 1994 10 Fiber 2.000 - 100BASE-FX (3) 100 Fiber 2.000 - IEEE 802.5: (2) 1987 4/16 STP FDDI: 1987-92 100 Fiber 2,000 200,000 1.000 Ethernet coaxial cable is specified as 50 ohm except for 10BROAD36, which uses 75 ohm. Unshielded twisted pair (UTP) is specified for 1BASE5, 10BASE-T, and 100BASE-T. The 10BROAD36 layer uses a broadband (DPSK) signaling technique. All other Ethernet physical media use baseband (manchester encoding) signaling. (1) The general Ethernet specifications allow no more than 1,024 stations on a network (repeaters are not included). (2) IEEE 802.5 (token ring) originally specified 1Mbps and 4Mbps data rates over a physical layer of two 150 ohm shielded twisted pairs (STP). (3) The 100BASE-TX, 100BASE-T4, and 100BASE-FX drafts were issued in August 1994.

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