1、 TIA-404-B-1995 APPROVED: NOVEMBER 15, 1995 REAFFIRMED: DECEMBER 26, 2001 REAFFIRMED: DECEMBER 7, 2012 TIA-404-B (Revision of TIA-404-A) March 1996Standard for Stop-Start Signal Quality for Non-Synchronous Data Terminal Equipment NOTICE TIA Engineering Standards and Publications are designed to serv
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6、f regulatory limitations before its use. (From Project No. 3-2797-RF2, formulated under the cognizance of the TIA TR-30.2 Subcommittee on DTE-DCE Interfaces and Protocols.) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Technology (b) there is no assurance that the Document will be approved by
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19、CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. EIA TIA-404-R 4k, 3234600 0573649 367 STANDARD FOR START-STOP SIGNAL QUALITY FOR NON-SYNCHRONOUS DATA TERMINAL EQUIPMENT (From TIA Project Number 2797. formulated under the cognizance of TIA Technical Subcomm
20、ittee TR-30.2 on Data Transmission Interfaces.) Contents Page 1 SCOPE . i 2 NORMATIVE REFERENCES 2 3 DEFINITIONS . 2 3.1 Baud 2 3.2 Bit 2 3.4 Data 3 3.4.1 Received Data . 3 3.3 Character 2 3.4.2 Transmitted Data . 3 3.5 Distortion . 3 3.5.1 Start-Stop Distortion 3 3.5.2 Gross Start-Stop Distortion 3
21、 3.5.3 Synchronous Start-Stop Distortion . 3 3.6 Margin . 3 3.6.1 Net Margin . 3 3.6.2 Practical Margin . 4 3.6.3 Synchronous Margin 4 3.7 Non-synchronous Start-Stop Operation 4 3.7.1 Start-Stop Modulation 4 3.7.2 Continuous Start-Stop Operation . 4 3.7.3 Start Element . 4 3.7.4 Start Transition 4 3
22、.7.5 Stop Element . 4 3.8 Unit Interval . 5 4 SIGNAL QUALITY FROM THE TRANSMITTING DATA TERMINAL EQUIPMENT . 5 4.1 Distortion . 5 4.2 Character interval 5 4.2.1 Minimum average character interval 6 4.2.2 Minimum character interval 6 5 5.2 Character interval 7 MARGIN OF RECEIVING DATA TERMINAL EQUIPM
23、ENT 6 5.1 Receiving margin . 7 i 5.2. I 5.2.2 5.3 Minimum average character interval 7 Minimum character interval . 7 Minimum duration start element 7 6 REQUIREMENTS FOR MEASUREMENTS OF INTERFACE CHARACTERISTICS 8 6.1 6.1.1 6.1.2 6.1.3 6.1.4 6.2 6.2.1 6.2.2 6.2.3 6.3 6.3.1 6.3.2 6.4 6.5 6.5.1 6.5.2
24、6.6 6.7 Measurement of EIMIA-232-E interface generator characteristics 8 Interface voltage measurement . 8 The standard distortion measurement thresholds 9 Measurement of EIMIA-232-E receiver characteristics . 9 Measurement of loading characteristics 9 Voltage characteristics 9 Margin measurements o
25、n EIMIA-232-E receivers . 9 generators . 10 Test load . 10 Measurement thresholds . 10 Margin measurements on TINEIA-422-B, TINEIA-423-B and EIA-485 receivers . 10 Distortion measurements on EIMIA-562 generators . 10 Test load . 10 Measurement thresholds . 10 Margin measurements on EIMIA-562 receive
26、rs 11 Tolerances of measuring equipment . 11 Use of standard test load . 8 Requirement for standard test load . 8 Distortion measurements on TINEIA-422-B, TINEIA-423-B and EIA-485 7 EXPLANATORY NOTES 12 Annex A (informative) . TUTORIAL NOTES . 13 EIA TIA-404-B 76 W 3234600 0573651 T15 = FOREWORD (Th
27、is Foreword is not part of this Standard) This Standard was formulated under the cognizance of TIA Subcommittee TR-30.2 on Data Transmission Interfaces. This Standard is a revision to EIA-404-A which adds requirements for EIA/TIA-562, Electrical Characteristics for An Unbalanced Digital Interface. I
28、n addition, requirements for electromechanical types of DTE (Teletype machines) have been removed. . III EIA TIA-404-B 96 6 3234600 0573b52 951 W BLANK PAGE iV EIA TIA-404-B 96 3234600 0573653 898 = 1 SCOPE I .I This Standard specifies the quality of serial binary data signals employing start- stop
29、(Le., asynchronous) format at a data terminal equipment interface. The scope of this standard is limited to signals as defined in TIA Standards TINEIA-422-B Electrical Characteristics of Balanced Voltage Digital Interface Circuits, TINEIA-423-B Electrical Characteristics of Unbalanced Voltage Digita
30、l Interface Circuits, EIA-485 Standard for Electrical Characteristics of Generators and Receivers for Use in Balanced Digital Multipoint Systems, ElMIA-562 Electrical Characteristics for An Unbalanced Digital Interface and the electrical characteristic portion of EICVTIA-232-E Interface Between Data
31、 Terminal Equipment and Data Communication Equipment Employing Serial Binary Data Interchange. For a signal quality standard at the interface with synchronous data circuit terminating equipment, see TIA Standard EIA-334-A, Signal Quality at Interface Between Data Terminal Equipment and Synchronous D
32、ata Circuit-Terminating Equipment for Serial Data Transmission. 1.2 This Standard recognizes the need to have a number of different sets of standard performance requirements because of differing operating conditions that lead to a different way of implementing equipment. A number of performance char
33、acteristics, therefore, are defined for transmitting equipment and for receiving equipment, it being the intent that any receiving category may be specified to operate with any transmitting category, the actual selection being dependent on such factors as channel performance, acceptable error rate,
34、and the economic considerations of the system. 1.2.1 Categories I and B, as defined herein, are specified for general purpose applications and the use thereof shall be assumed unless a different category is specified for the equipment used. 1.3 This Standard is of particular importance when the equi
35、pment in a system is furnished by different organizations. It does not attempt to indicate what action, if any, is to be taken if the limits are not met, but it is intended to provide a basis for agreement between parties involved. I .4 Any equipment which is represented as complying with limits est
36、ablished by this Standard shall meet the applicable specifications with the ranges of those factors which are described as appropriate for the operation of the equipment, such as primary power voltage and frequency, ambient temperature and humidity. 1.5 This Standard does not describe signal quality
37、 performance characteristics of data circuit-terminating equipment or the communications channel associated with it. Neither does it describe any requirement for error performance of the system or any of its components. Compliance of the terminais with the requirements for a particular standard sign
38、al quality performance category should not be construed as establishing an acceptable error rate for the terminals or the system. 1 EIA TIA-404-B %b eLI 3234608 057365i.i 724 ANSI/TIA/EIA-404-B 2 NORMATIVE REFERENCES The following standards contain provisions which, through reference in this text, c
39、onstitute provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on.this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated
40、below. ANSI and TIA maintain registers of currently valid national standards published by them. ANSI/EIA/TIA-232-E-I 991, Interface Between Data Teminal EguNrnent and Data Circuif- Terminating Equipment Employing Serial Binary Data Interchange ANSI/TIA/EIA-422-B-I 994, Electrical Characteristics of
41、Balanced Voltage Digital Interface Circuits ANSI/TIA/EIA-423-B-I 995, Electrical Characteristics of Unbalanced Voltage Digital Interface Circuits EIA-485, Standard for Electrical Characteristics of Generators and Receivers for Use in Balanced Digital Multipoint Systems ANSI/EIA/TIA-562-1989, Electri
42、cal Characteristics for An Unbalanced Digital Interface 3 DEFINITIONS The following definitions apply to the characteristics of signal quality described in this Standard and, for the purposes of this Standard, are the only meaning that should be attached to the characteristics described. 3.1 Baud A
43、unit of signaling speed equal to the number of discrete signal conditions, variations or events per second. When applied to digital signal transmission, the baud rate is equal to the number of bits per second. 3.2 Bit (Binary Digit) A unit of information equal to a single binary decision. 3.3 Charac
44、ter A letter, digit, or other symbol that is used as part of the organization, control or representation of data and that consists of a specified number of bits to include start and stop elements, and various combinations of information, control, and error checking bits. 2 ?IA TIA-4QY-B 96 3234600 0
45、573655 660 ANSIlTINEIA-404-B 3.4 Data 3.4.1 Received Data Data from a remote location that has been processed by the data circuit-terminating equipment (DCE) and passed on to the data terminal equipment (DTE) on the receive data interchange circuit. 3.4.2 Transmitted Data Data originating within the
46、 DTE and passed to the DCE on the transmit data interchange circuit. 3.5. Distortion 3.5.1 Start-Stop Distortion In non-synchronous start-stop signaling, the shifting of transition points of the signal pulses (bits) from their proper positions relative to the beginning of the start pulse. The magnit
47、ude of the distortion is expressed in percent of a perfect unit interval (bit) length. Distortion is expressed as positive when the transition occurs after its ideal instant, and negative when the transition occurs prior to its ideal instant. 3.5.2 Gross Start-Stop Distortion A measured distortion o
48、f a start-stop transmission system when the unit interval corresponds exactly to the nominal bit rate of the system. 3.5.3 Synchronous Start-Stop Distortion A measured distortion of a start-stop transmission system when the unit interval corresponds to the actual mean bit rate of the signal. 3.6 Mar
49、gin A measure of receiver performance expressed as the maximum degree of received signal distortion that will permit the correct translation of the signal at the receiver. 3.6.1 Net Margin The maximum degree of distortion that permits correct DCE operation when applying a test signal at the DCE receiver that exhibits an average modulation (bit) rate equal to the nominal modulation rate at the DCE. 3 EIA TIA-LiOl!-B 9ta 3234600 057365b 5T7 ANSI/lIA/EIA-404-B 3.6.2 Practical Margin The maximum degree of distortion that permits correct DCE operation when applying a test signal at the
