CEA-709 3-1999 Free-Topology Twisted-Pair Channel Specification《自由拓扑双绞线信道规范》.pdf
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1、 ANSI/CEA Standard Free-Topology Twisted Pair Channel Specification ANSI/CEA-709.3-R2004 December 1999 NOTICE Consumer Electronics Association (CEA) Standards, Bulletins and other technical publications are designed to serve the public interest through eliminating misunderstandings between manufactu
2、rers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards, Bulletins and other technical publications shall not in any respect pre
3、clude any member or nonmember of CEA from manufacturing or selling products not conforming to such Standards, Bulletins or other technical publications, nor shall the existence of such Standards, Bulletins and other technical publications preclude their voluntary use by those other than CEA members,
4、 whether the standard is to be used either domestically or internationally. Standards, Bulletins and other technical publications are adopted by CEA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, CEA does not assume any liability to any patent owne
5、r, nor does it assume any obligation whatever to parties adopting the Standard, Bulletin or other technical publication. This CEA Standard is considered to have International Standardization implication, but the International Electrotechnical Commission activity has not progressed to the point where
6、 a valid comparison between the CEA Standard and the IEC document can be made. This Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and he
7、alth practices and to determine the applicability of regulatory limitations before its use. (Formulated under the cognizance of the CEAs R7.1 HCS1 Subcommittee) Published by CONSUMER ELECTRONICS ASSOCIATION 2004 Technology Phone 800-854-7179; Fax 303-397-2740; Internet http:/; Email 3 Network Overv
8、iew The EIA-709.3 free-topology twisted-pair channel supports up to 128 nodes on a single network segment with an optional link power source that supplies DC power to the nodes on the network. The channel is specified to support free-topology wiring, and will accommodate bus, star, loop, or any comb
9、ination of these topologies. The total network length and number of nodes may be extended by use of EIA-709.3 channel physical layer repeaters, or EIA-709.1 compliant routers. The channel data rate is 78.125 kbps. Nodes can be either locally powered or link powered. A link-powered node derives its p
10、ower from the network. The power is delivered on the same two conductors that carry data. Nodes are polarity-insensitive with respect to data as well as DC power. A locally powered node derives its power from a local source. The data is transmitted using Differential Manchester encoding, which is po
11、larity-insensitive. 4 System Specifications This section specifies the cable type used, terminations required with bus or free topology, maximum node counts and distances for link and locally powered schemes, and the maximum steady state power that can be drawn from the link power supply. 4.1 Cable
12、The cable shall conform to ANSI EIA/TIA 568A Category 5 requirements for 24 AWG unshielded twisted-pair cable. For a complete specification, see ANSI/TIA/EIA-568-A-1995. 1 CEA-709.3 4.2 Topology 4.2.1 Free or Bus Topology The network may use either a singly-terminated free topology or a doubly-termi
13、nated bus topology. 4.2.2 Repeater Two network segments may be interconnected with an EIA-709.3 channel physical layer repeater. No more than one physical layer repeater shall be in a path between any two nodes on a network. Physical layer repeaters shall not be interconnected in such a way as to cr
14、eate a loop. Each port of a physical layer repeater shall meet the specifications stated in Sections 6.2, 6.3.2, and 6.4. The delay through the repeater shall not exceed 36 s. 4.3 Cable Termination 4.3.1 Free-topology Segment A free-topology segment shall have a single termination. If the segment is
15、 locally powered, an RC network as shown in Figure 1 shall be used, with R1 = 52.3 1%, 1/8 W. The termination may be located anywhere on the segment. If the segment is link-powered, the termination shall be provided by the link power source. See Figure 5. The link power source and termination may be
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