1、STD*AECMA PREN 37LO-OOL-ENGL L77b LOL23LL OOLL579 L7b Edition approved for publication AECMA STANDARD NORME AECMA AECMA NORM C2 Chairman Comments should be sent within six months after the date of publication to prEN 39 1 0-00 1 Edition P 1 January 1996 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROS
2、PACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (32) 2 775 81 1 O - Fax. (32) 2 775 81 11 ICs : Descriptors : ENGLISH VERSION Aerospace series High speed data transmission under STANAG 3838 or fibre optic equivalent control Srie arospatiale Transmission haute vitesse contrle par STAN
3、AG 3838 ou son quivalent par fibre optique Luft- und Raumfahrt Schnelle Datenbertragung unter STANAG 3838-Kontrolle oder dessen faseroptischem quivalent This “Aerospace Series Piestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is pu
4、blished on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Technical Committee follo wing comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that inte
5、rchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre INPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CE
6、N (European Committee for Standardization) for formal vote. 1996-01 -31 AECMA Gulledelle 94 B-1200 BRUXELLES I M. Pezzetta STD-AECMA PREN 37LO-OOL-ENGL 177b LO123L1 0011580 778 = Page 2 prEN 3910-001 : 1996 Contents list O 1 2 3 4 Annex A (informative) Annex B (informative) Annex C (normative) Annex
7、 D (informative) Annex E (informative) Annex F (informative) Annex G (informative) Introduction . 3 Scope . 3 References . 4 Definitions . 5 General requirements 9 Specific Implementations . 62 HS Fibre Optic Media Slash Sheets . 65 Frame Check Sequence Implementation . 76 Block Diagram for Error Ra
8、te / Waveform Test 79 HS Electrical Media Slash Sheets 80 85 Keyword Index . 87 Block Diagrams for Electrical HS Bus Error Rate Testing . Page 3 prEN 3910-001 : 1996 O Introduction This standard contains requirements for an aircraft internal time division multiplex data bus for use in systems integr
9、ation of aircraft subsystems. The data bus consists of a STANAG 3838 (MIL-STD-1553B) controlled fibre optic or electrical interconnection channel for high speed data transmission. The control system is fully compatible with STANAG 3838 or its fibre optic equivalent. (In this document any reference t
10、o STANAG 3838 should be taken to mean either STANAG 3838 or its fibre optic equivalent). Even with the use of this standard, subtle differences will exist between data buses used on different aircraft due to particular aircraft mission requirements and the designer options allowed in this standard.
11、The system designer has to recognize this fact and design the bus controller hardware and software to accommodate such differences. These designer selected options has to exist, so as to allow the necessary flexibility in the design of specific multiplex systems in order to provide the control mecha
12、nism, architecture redundancy, degradation concept and traffic patterns peculiar to the specific aircraft mission requirements. The following document is structured to follow the organization of STANAG 3838 document as closely as possible. The high speed media characteristics are defined in parametr
13、ic terms in the body of the standard, with the numerical values corresponding to optional implementation configurations being given in the “HS Fibre Optic Media Slash Sheets“ (ANNEX B) or “HS Electrical Media Slash Sheet“ (ANNEX E). The main body of this document is identical to the final draft of S
14、TANAG 3910. 1 Scope This standard specifies the characteristics and requirements of a data bus system which consists of one or more High Speed (HS) Channel(s1 for HS data transmission and one Low Speed (LS) Channel for control and LS data transmission. The standard defines the HS fibre optic or HS e
15、lectrical data bus transmission line. The concept of operation and information flow on the HS multiplex data bus and the optical, electrical and functional formats to be employed are also defined. The electro-optical or electrical HS transmission and reception units which interface to the associated
16、 protocol electronics are described in EN 371 5. When invoked in a specification or statement of work, the requirements defined in this standard shall apply to the multiplex data bus and associated equipment which is developed either alone or as a portion of an aircraft system or subsystem developme
17、nt. Page 4 prEN 3910-001 : 1996 Four types of system are defined : Type A Low Speed Channel - STANAG 3838 data bus High Speed Channel - Fibre Optic data bus Type B Low Speed Channel High Speed Channel - Fibre Optic equivalent of STANAG 3838 - Physically separate Fibre Optic data bus data bus Type C
18、Low Speed Channel High Speed Channel - Fibre Optic equivalent of STANAG 3838 - Wavelength Division Multiplexed with the Low data bus Speed Channel onto a common fibre optic medium Type D Low Speed Channel - STANAG 3838 data bus High Speed Channel - Physically separate wire data bus The implementatio
19、n of a fibre optic medium for the HS Channel is given in Annexes A and B. The implementation of an electrical medium for the HS Channel is given in Annex E. The redundancy of individual LS and HS Channels is implementation specific. 2 Normative references This European Standard incorporates by dated
20、 or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard onl
21、y when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. MIL-STD-15538 Digital Time Division Command/Response Multiplex Data Bus 1) STANAG 3838 Digital Time Division Command/Response Multiplex Data Bus (MIL-STD- 15538) 2) S
22、TANAG 391 O High Speed Data Transmission under STANAG 3838 or Fibre Optic Equivalent Control 2) EN 3715 Aerospace series - Interface for transceivers compatible with data bus CCITT Recomm. G.651 Annex B : Meaning of the Terms Annex C : Fibre Test Methods 4) CCITT-CRC Cyclic Redundancy Check 4) EN 39
23、10-001 3) 1) Published by : Department of Defense (DoD), Pentagon ; Washington D.C. 20301 2) Published by : NATO Military Agency for Standardisation (MAS) ; B-111 O Brussels 3) In preparation at the date of publication of the present standard. 4) Published by : CCITT (International Telegraph and Tel
24、ephone Consultative Committee) ; CH-121 1 Geneva 20 STD.AECMA PREN 3710-001-ENGL L97b LOL23LL OOLL583 bT7 Page 5 prEN 3910-001 : 1996 3 Definitions For the purposes of this standard the following definitions apply : 3.1 Access Coupler An access coupler is a device which distributes optical or electr
25、ical power among several ports. Star couplers and Tee couplers are examples of access couplers. 3.2 Asynchronous Operation Asynchronous operation is the use of an independent clock source in each terminal for message transmission. Decoding is achieved in receiving terminals using clock information d
26、erived from the message. 3.3 Bit Contraction of binary digit : may either be zero or one. In information theory a binary digit is equal to one binary decision or the designation of one of two possible values or states of anything used to store or convey information. 3.4 Bit Rate Number of bits trans
27、mitted per second. 3.5 Broadcast Operation of a data bus system such that information transmitted by the Bus Controller or a terminal is addressed to the other terminals connected to the data bus. 3.6 Bus controller (BC) The terminal assigned the task of initiating information transfers on the data
28、bus. 3.7 Bus Monitor (BM) A terminal assigned the task of receiving bus traffic and extracting selected information to be used at a later time. 3.8 Central Repeater (CR) The Central Repeater is an active device which amplifies, reformats and resynchronises signals between the Collection Line and the
29、 Distribution Line. 3.9 Collection Line The Collection Line is a transmission line which is used to collect signals from HS Terminals transmitters. The Collection Line is connected to the Central Repeater input. Page 6 prEN 3910-001 : 1996 3.1 O Command/Response Operation of a data bus system such t
30、hat remote terminals receive and transmit data only when commanded to do so by the Bus Controller. 3.11 Data Bus Whenever a data bus or bus is referred to in this document, it shall imply all the hardware in the signal distribution channel, including the harness assembly of cables, access coupler(s)
31、, connectors, etc., required to provide a single data path between all terminals. 3.12 Data Channel A Data Channel (either HS or LS Channel) is defined as the logical connection between the HS interfaces or between LS interfaces of two terminals comprising all Physical Media Paths of the redundant c
32、onfiguration. 3.13 Directional Coupler A Directional Coupler is an access tee coupler having three ports named port 1, port 2 and port 3. It provides low insertion loss between port 1 and port 2, coupling between port 1 and port 3 and isolation between port 2 and port 3. Directional Couplers are use
33、d to connect the Stubs to the Collection Line or to the Distribution Line. 3.14 Distribution Line The Distribution Line is a transmission line on which collected signals are broadcasted to HS Terminals receivers. The Distribution is connected to the Central Repeater output. 3.1 5 Dynamic Bus Control
34、 The operation of a data bus system in which bus control can be dynamically passed between cooperating terminals. 3.16 Half Duplex Operation of a data transfer system in either direction over a single line, but not in both directions on that line simultaneously. 3.17 HS Channel The HS Channel is the
35、 high speed data bus used to transfer data between terminals and is defined as the logical connection between the HS interfaces of terminals comprising all physical media paths of the redundant configuration. STD-AECMA PREN 391O-001-ENGL L77b 1012311 0011585 Li7T = Page 7 prEN 3910-001 : 1996 3.18 H
36、S Media interface Unit (HS MIU) The HS Media Interface Unit is the part of the terminal which interfaces with the transmission media and where the electrical/optical and the optical/electrical or electrical/electricaI conversion is performed. 3.19 HS Message HS Messages consist of HS Control Formats
37、) transmitted via the LS Channel and an HS Message Frame transmitted on an HS Channel. For the case of an HS remote terminal to remote terminal transfer, the message includes an HS RECEIVE and an HS TRANSMIT Control Format and an HS Message Frame for data transmission. 3.20 LS Channel The LS Channel
38、 is the low speed data bus used to issue commands requesting the transfer of data on the high or low speed data bus and is defined as the logical connection between the LS interfaces of terminals comprising all physical media paths of the redundant configuration. 3.21 Mode Code A means by which the
39、Bus Controller can communicate with the multiplex bus related hardware in order to assist in the management of information flow. 3.22 Path (Physical Media Path) A Path (Physical Media Path) of a channel is defined as the physical connection between the HS or the LS Channel interfaces of any two term
40、inals via any single transmission media of the redundant configuration. 3.23 Protocol Data Unit (PDU) The Protocol Data Unit is that part of the HS Message frame between the Start and End Delimiters. 3.24 Pulse Code Modulation (PCM) The form of modulation in which the modulation signal is sampled, q
41、uantized and coded CO that each element of information consists of different types or numbers of pulses and spaces. 3.25 Redundant Data Bus The use of more than one data bus to provide more than one data path between the subsystems, .e., dual redundant data bus, triple redundant data bus, etc STD-AE
42、CMA PREN 39LO-001-ENGL L77b LO123Ll 00LL58b 30b M Page 8 prEN 3910-001 : 1996 3.26 Remote Terminal (RT) All terminals not operating as the Bus Controller or as a Bus Monitor. 3.27 STANAG 3838 Message A STANAG 3838 Message is a message transmitted on the LS Channel. A single STANAG 3838 message is th
43、e transmission of a Command Word, Status and Data Words if they are specified. For the case of a remote terminal to remote terminal (RT to RT) transfer, the message shall include the two Command Words, the two Status Words and Data Words. 3.28 STANAG 3838 Word In this document a STANAG 3838 word is
44、a sequence of 16 bits plus sync and parity transmitted on the LS Channel. There are three types of STANAG 3838 words : Command Word, Status Word and Data Word. 3.29 HS Stub An HS Stub is a transmission line which connects an HS Terminals transmitter or an HS Terminals receiver to a Collection Line o
45、r to a Distribution Line respectively. 3.30 Subsystem The device or functional unit receiving data transfer service from the data bus(es1. 3.31 Terminal The electrical and/or electro-optical module necessary to interface the data bus with the subsystem and subsystem with the data bus. Terminals may
46、exist as separate line replaceable items (LRls) or be contained within the elements of the subsystem. 3.32 Time Division Multiplexing (TDM) The transmission of information from several signal sources through one communication system with different signal samples staggered in time to form a composite
47、 pulse train. 3.33 Transmission Protocol Interface Unit (TPIU) The Transmission Protocol Interface Unit is the part of the terminal where the protocol functions are performed. 3.34 Wavelength Division Multiplexing (WDM) The transmission of information from several signal sources through one communic
48、ation system using different wavelengths to allow multi-channel operation. STD-AECMA PREN 39LO-001-ENGL 299b LO22312 0012587 2q2 Page 9 prEN 3910-001 : 1996 4 General requirements 4.1 Test and Operating Requirements All requirements as specified herein shall be met in environments as specified in th
49、e relevant individual equipment specifications. 4.2 General Description The High Speed (HS) bus system is formed by a set of terminals and a Bus Controller (BC) which are connected by. - a Low Speed Channel (1 Mbit/s) for both system control and low speed data transmission - by a High Speed Channel (Rd Mbit/s) for high speed data transmission. and The HS Channel is built up by a broadband transmission medium. The functional block diagram of an HS data bus system under STANAG 3838 control is shown in figure 1. Figure 2 shows the functional block diagram of an HS data bu
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