1、 ANSI/CEA Standard Fiber-Optic Channel Specification ANSI/CEA-709.4 February 2013 Note: This standard is the same as EIA-709.4, later renamed CEA-709.4, which was approved as an EIA standard in November 1999, and as an ANSI standard in August 2000. ANSI administratively withdrew it in 2010 due to la
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8、ed reproduction of this document by any means. Organizations may obtain permission to reproduce a limited number of copies by entering into a license agreement. Requests to reproduce text, data, charts, figures or other material should be made to CEA. (Formulated under the cognizance of the CEA R7 H
9、ome Networks Committee.) Published by CONSUMER ELECTRONICS ASSOCIATION 2013 Technology Phone 800-854-7179; Fax 303-397-2740; Internet http:/; Email 3 Network Overview The EIA-709.4 channel is specified to support a ring topology but will accommodate a bus topology with loss of redundancy. The total
10、 network length and number of nodes may be extended by use of ANSI/EIA-709.1-A compliant routers equipped with EIA-709.4 transceivers. The transmit signal is obtained by amplitude modulating the carrier frequency with a Differential Manchester signal, which is polarity insensitive. CEA-709.4 2Figure
11、 1 Relation of Specification to EIA-709 Model 4 Channel Specifications The fiber-optic channel specifications address the media (fiber cables), the connector styles, the optical wavelength, the network topology, and the requirements for each individual node. 4.1 Optical Interconnect This section def
12、ines options for fiber-optic cables and optical wavelengths. The cables listed in Table 1 shall be used for the network wiring. Cables shall use optical fiber that meets the specifications of ANSITIAEIA 492AAAA-A. The standard optical wavelengths are either 850 35 nanometers or 1320 35 nanometers. A
13、ll links on a given network shall operate at the same wavelength. Application and (ii) a byte-sync field. The bit-sync field is a series of Differential Manchester “1”s. The byte-sync field is a single-bit Differential Manchester “0” that marks the end of the preamble and the beginning of the first
14、byte of the LPDU/MPDU delivered to the physical layer by the data link layer/media access sub-layer. The emitter shall terminate the packet by forcing a Differential Manchester line code violation, i.e., it shall hold the data output transitionless long enough for the receiver(s) to recognize an inv
15、alid bit code (line code violation). To the receiver(s), this shall signal the end of the packet. Specifically, at the end of packet transmission, the transmitted waveform shall remain transitionless for at least 1.30 microseconds after the final clock transition (excepting the final data transition
16、 if present). The emitter shall ensure that no light is emitted during the idle periods between packets. The idle periods between packets include one Beta1 slot and a random number of Beta2 slots. For definitions of Beta1 and Beta2, see the EIA-709.1-A Control Network Protocol Specification 1. The
17、timing of these periods is generated by the MAC sublayer of EIA-709.1-A. Timing values for the EIA-709.4 channel type are specified in Section 5 of this document. 5.2.2.2 Receive Mode Consistent with the PPDU format shown in Figure 6, the emitter/detector in receive mode shall accept a bit stream on
18、 the medium in accordance with Figure 7. The receiver shall detect edge transitions during two windows for each bit period, T. The first window is at T/2, and determines if a “0” is being received. The second window is at T, and defines a “1”. The transition during the second window sets up the next
19、 two windows at T/2 and T. The receiver shall receive data as long as transitions continue. Timing instability, or jitter, may be caused by changes in the communication medium, or instability in the input clocks of the transmitting or receiving nodes. The value of T/2 shall be 400 +/- 80 nanoseconds
20、 and T shall be 800 +/- 80 nanoseconds. For the receiving node to reliably terminate reception of a packet, the received line-code violation period must have no transitions until the receiving node detects the end of the packet. The receiving node shall terminate a packet if no clock transitions are
21、 detected after the last bit. The receiver shall ensure reception of data by the node under all conditions specified in this document. CEA-709.4 75.2.3 Transmit and Receive Control The transmit and receive control logic shall control the flow of message data between each Emitter/Detector and the Pro
22、tocol Processor Interface by controlling whether the Emitter/Detector is in receive mode or transmit mode. In transmit mode, the transceiver shall simultaneously send data from Emitter/Detector A and Emitter/Detector B. When not actively transmitting data, the transceiver shall place Emitter/Detecto
23、r A and Emitter/Detector B in receive mode. When the first valid data bit is received from either Emitter/Detector the transmit Phone 800-854-7179; Fax 303-397-2740; Internet http:/; Email IEC 61000, Electromagnetic compatibility (EMC) IEC 61000-4-2, Part 4: Testing and measurement techniques Secti
24、on 2: Electrostatic discharge immunity test (1995) IEC 61000-4-3, Part 4: Testing and measurement techniques Section 3: Radiated, radio-frequency, electromagnetic field immunity test (1995) IEC 61000-4-4, Part 4: Testing and measurement techniques Section 4: Electrical fast transient/burst immunity
25、test (1995) IEC 61000-4-5, Part 4: Testing and measurement techniques Section 5: Surge immunity test (1995) Global Engineering Documents, World Headquarters, 15 Inverness Way East, Englewood, CO USA 80112-5776; Phone 800-854-7179; Fax 303-397-2740; Internet http:/; Email ; OR IEC Central Office, 3,
26、 rue de Varembe, PO Box 131, CH-1211 Geneva 20, Switzerland; Phone +41 22 919 02 11; Fax +41 22 919 03 00; Internet http:/www.iec.ch; Email pubinforiec.ch CEA-709.4 9Appendix A Environmental Specifications (Informative) The environmental specifications for a node vary with application. Therefore, th
27、is document does not specify a standard set of environmental conditions for all devices. The requirements of the appropriate agencies and regulatory bodies should be observed for each application. Table 4 lists a representative set of environmental specifications for nodes. EMI FCC Part 15 Level B E
28、SD Immunity IEC 61000-4-2, Level 2 Radiated Electromagnetic Immunity IEC 61000-4-3, Level 2 Fast Transient/ Burst Immunity IEC 61000-4-4, Level 2 Surge Immunity IEC 61000-4-5, Level 2 Transceiver Operating Temperature -10 to +60C Table 4 Representative Environmental Specifications for Nodes EIA-709.
29、4 nodes must be designed to meet the radiation limits prescribed by the regulations appropriate to the country in which it is operated. In the United States, the limits are defined in 47 CFR 15, Subpart B (Unintentional Radiators), U.S. Code of Federal Regulations, (formerly known as FCC Part 15, Su
30、bpart J.) Table 5 lists a representative set of specifications. Description Conditions Specification Ambient temperature Operating Storage -10 to +60C -40 to +85C Optical fiber cables, flame & smoke requirements NEC-770, UL-1581 Average Cable Temperature Operating -10 - +60C Table 5 Representative D
31、ata Cabling Environmental Specifications (This page intentionally left blank.)CEA Document Improvement Proposal If in the review or use of this document a potential change is made evident for safety, health or technical reasons, please email your reason/rationale for the recommended change to standardsce.org. Consumer Electronics Association Technology & Standards Department 1919 S Eads Street, Arlington, VA 22202 FAX: (703) 907-7693 standardsce.org
