1、 TIA-574-1990 APPROVED: MARCH 26, 1990 REAFFIRMED: DECEMBER 10, 1998 REAFFIRMED: MAY 20, 2003 REAFFIRMED: DECEMBER 7, 2012 TIA-574 September 19909-Position Non-Synchronous Interface Between Data Terminal Equipment and Data Circuit-Terminating Equipment Employing Serial Binary Data InterchangeNOTICE
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3、proper product for their particular need. The existence of such Standards and Publications shall not in any respect preclude any member or non-member of TIA from manufacturing or selling products not conforming to such Standards and Publications. Neither shall the existence of such Standards and Pub
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5、or does it assume any obligation whatever to parties adopting the Standard or Publication. 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 s
6、afety and health practices and to determine the applicability of regulatory limitations before its use. (From Project No. 3-4094-RF3, formulated under the cognizance of the TIA TR-30.2 Subcommittee on DTE-DCE Interfaces and Protocols.) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Technology
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18、NTAL OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF BUSINESS, LOSS OF PROFITS, LITIGATION, OR THE LIKE), WHETHER BASED UPON BREACH OF CONTRACT, BREACH OF WARRANTY, TORT (INCLUDING NEGLIGENCE), PRODUCT LIABILITY OR OTHERWISE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THE FOREGOING
19、NEGATION OF DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. STD-EIA TIA-57q-ENGL 1770 3234b00 Ob1390b L7q EIA/TIA-574 CONTENTS 1 .SCOPE . i 1.1 GENERAL 1 1.2 CONNECTION . 1 1.3 BITSEQUENCES 1 1.4 DATA SIGN
20、ALING RATES . 1 1.5 NON-SYNCHRONOUS COMMUNICATION . 1 1.6 CLASSES OF SERVICE 1 2 . INTERFACE MECHANICAL CHARACTERISTICS 2 2.1 POINT OF INTERFACE 2 2.2 INTERFACE CONNECTOR . 2 2.3 CONNECTOR CONTACT ASSIGNMENTS 7 3 . FUNCTIONAL DESCRIPTIONS OF THEINTERCHANGE CIRCUITS 8 3.1 GENERAL 8 3.2 CLASSIFICATION
21、 OF CIRCUITS . 8 3.3 SIGNAL CHARACTERISTICS, GENERAL 9 3.4 DEFINITIONS OF INTERCHANGE CIRCUITS 9 LIST OF FIGURES Figure 2.1 . 2 Figure2.2 . 3 Figure23 . 4 Figure2.4 . 5 Figure2.5 . 6 Figure2.6 . 6 Figure2.7 . 7 Figure3.1 . 8 ii STD-EIA TIA-57Y-ENGL 1770 m 323Yb00 Ob13707 000 m EIA/TIA-574 Page 1 SEC
22、TION ONE 1. SCOPE 1.1 GENERAL This Standard is applicable to the interconnection of data terminating equipment (DTE) and data circuit-terminating equipment (DCE) employing serial binary data interchange where a minimal number of control and information circuits are required. It defies: Section 1 - S
23、cope Section 2 - Interface Mechanical Characteristics Section 3 - Functional Description of the Interchange Circuits The electrical characteristics applicable to this interface can be found in AMERICAN NATIONAL STANDARD ANSI/EIA/TIA-562. 1.2 CONNECTION When used in conjunction with the above mention
24、ed electrical characteristics standard, this Standard applies where equipment on one side of the DTE/DCE interface is intended for connection directly to the other side without additional technical considerations. 1.3 BIT SEQUENCES This Standard applies to data communication systems where data is bi
25、t serialized by the DTE and the DCE and places no restrictions on the arrangement or the sequence of bits. 1.4 DATA SIGNALING RATES This Standard is applicable for use at all data signaling rates supported by EIA/TIA-562. 1.5 NON-SYNCHRONOUS COMMUNICATION This Standard applies to non-synchronous ser
26、ial binary data communication systems. 1.6 CLASSES OF SERVICE This Standard applies to switched, non-switched, dedicated, leased or private line service, either two-wire or four-wire. Consideration is given both to point-tepoint and multipoint operation. EIA/TIA-574 Page 2 SECTION TWO 2. INTERFACE M
27、ECHANICAL CHARACTERISTICS 2.1 POINT OF INTERFACE The interface between the DTE and the DCE is located at a pluggable connector signal interface point between the two equipments (see Figure 2.1). A %position connector is specified for this interface. Figure 2.1 Point of Interface The DTE shall be pro
28、vided with a male connector as specified in Section 2.2. An interface cable terminated in a female connector as specified in Section 2.2 should be provided for connection to the DCE. The configuration for connection of the interface cable at a point other than the point of demarcation is not specifi
29、ed. NOTE: When additional functions are provided in a separate unit inserted between the DTE and the DCE, the male connector shall be associated with the side of the unit which interfaces with the DTE. A cable with a female connector shall be provided on the side of the unit which interfaces the DCE
30、. 2.2 INTERFACE CONNECTOR Figure 2.2 illustrates the cable interface connector which has female contacts (sockets) and a male shell (receptical). Figure 2.3 illustrates the DTE connector which has male contacts (pins) and a female shell (plug). These figures also illustrate the contact numbering. Fi
31、gures 2.4, 2.5 and 2.6 illustrate contact spacing and dimensions. STD-EIA TIA-574-ENGL L770 m 323qb00 ObL3707 783 m 16.46 16.21 EIA/TIA-574 Page 3 Figure 2.2 Cable Interface Connector EIA/TIA-574 Page 4 R 2.69 17.04 16.79 - r I Figure 2.3 DTE Interface Connector EIA/TIA-574 Page 5 L5.49 Dimensions i
32、n mi 11 imetres Figure 2.4 Insert Dimensions EU f TIA-574 Page 6 10.03 -+=“ Figure 2.5 Contact Specification - Male 9.63 c “ “- When the pin is mated with the socket, sufficient applied by the socket to ensure proper electrical force shall be contact. Figure 2.6 Contact Specification - Female 4 STD-
33、EIA TIA-57q-ENGL L770 m 3234b00 Ob13713 304 m 2.3 CONNECTOR CONTACT ASSIGNMENTS Contact Number 1 2 3 4 5 6 7 8 9 Circuit 109 104 103 10812 102 107 105/133 106 125 Description Received Line Signal Detector Received Data Transmitted Data DTE Ready Signal Common DCE Ready Request to Send/Ready for Rece
34、iving Clear to Send Ring Indicator Figure 2.7 EIA/TIA-574 Page 7 Connector Contact Assignments Note: When hardware flow control is required Circuit 105 may take on the functionality of Circuit 133. EIA/TIA-574 Page 8 SECTION THREE 3. FUNCTIONAL DESCRIPTIONS OF THE INTERCHANGE CIRCUITS 3.1 GENERAL Th
35、is Section defines the basic interchange circuits that apply, collectively, to all systems. 3.2 CLASSIFICATION OF CIRCUITS Each interchange circuit is characterized as one of the three following types: Signal Common Data Control A list of interchange circuits specifying the circuit number, name, typ
36、e and direction relative to the DCE, of each, is presented in Figure 3.1. Number Name 102 Sianal Common 103 Transmitted Data 104 Received Data 105 Request to Send 106 Clear To Send 107 DCE Ready 108/2 DTE Ready 133 Ready for Receiving 125 Ring Indicator 109 Received Line Signal Detector Circuit Dire
37、ction To DCE From DCE To DCE From DCE From DCE To DCE From DCE To DCE From DCE Circuit Type Signal Common Data Data Control Control Control Control Control Control Control Figure S.1 Interchange Circuits by Category STD-EIA TIA-574-ENGL L770 m 3234b00 Ob13715 L87 m EIA/TIA-574 Page 9 3.3 SIGNAL CHAR
38、ACTERISTICS, GENERAL Interchange circuits transferring data across the interface shall hold MARK (binary ONE) or SPACE (binary ZERO) conditions for the total nominal duration of each signal element. Distortion tolerances axe set forth in EIA-404A, Standard for Start-Stop Signal Quality for Non- sync
39、hronous Data Terminal Equipment. 3.4 DEFINITIONS OF INTERCHANGE CIRCUITS Circuit 102 - Signal Common Direction - not applicable This circuit establishes the common reference potential for all interchange circuits. Within the DCE, this circuit shall be brought to one point and it shall be possible to
40、 connect this point to Protective Ground by means of a wire strap inside the equipment. This wire strap may be connected or removed, at installation, as required to meet applicable regulations or to minimize the introduction of noise into the electronic circuitry. This strap may be paralleled by an
41、impedance (high at low frequencies) to provide, when the strap is removed, for immunity to static discharges or for other purposes. Circuit 105 - Transmitted Data Direction - To the DCE Signals on this circuit are generated by the DTE and transferred to the local DCE for transmission to remote DTEs
42、or for maintenance or control of the local DCE. The DTE shall hold Circuit 103 in the binary ONE (MARK) condition at all times when no data or maintenance or control signals are being transferred across the interface. In all systems, except as noted below, the DTE shall not transfer data across the
43、interface unless an ON condition exists on all of the following Circuits (where they axe implemented): - Circuit 105, Request to Send - Circuit 106, Clear to Send - Circuit 107, DCE Ready - Circuit 108/2, DTE Ready In DTEs supporting serial dialing DCEs, programming or control signals maybe transfer
44、red across the interface on Circuit 103 when the conditions listed below exist for the Circuits specified (where they are implemented): - Circuit 106, Clear to Send = ON - Circuit 107, DCE Ready = OFF - Circuit 108/2, DTE Ready = ON EIA/TIA-574 Page 10 Circuit 104 - Received Data Direction - From th
45、e DCE Signals on this circuit are generated by the receiving DCE in response to data signals received from the remote DCE, or in response to maintenance or control signals from the local DTE. Circuit 104 shall be held in the binary ONE (MARK) condition at all times when Circuit 109 (Received Line Si
46、gnal Detector) is in the OFF condition. In half-duplex operation, Circuit 104 shall be held in the binary ONE (MARK) condition when Circuit 105 (Request to Send) is ON and for a brief interval following the ON to OFF transition of Circuit 105 to allow for the completion of transmission (see Circuit
47、103 - Transmitted Data) and the decay of line reflections. Circuit 105 - Request to Send Direction - To the DCE This circuit is used to condition the local DCE for data transmission and on a half-duplex channel, to control the direction of data transmission of the local DCE. In one-way or duplex ope
48、ration, the ON condition maintains the DCE in the transmit mode. The OFF condition maintains the DCE in a non-transmit mode. In half-duplex operation, the ON condition maintains the DCE in the transmit mode and inhibits the receive mode. The OFF condition maintains the DCE in the receive mode. A tra
49、nsition from OFF to ON instructs the DCE to enter the transmit mode. The DCE responds by taking such action as may be necessary and indicates completion of such action by turning ON Circuit 106 (Clear to Send), thereby indicating to the DTE that data may be transferred across the interface on Circuit 103 (Transmitted Data). A transition from ON to OFF instructs the DCE to complete the transmission of all data which was previously transferred across the interface on interchange Circuit 103 and then assume a non-transmit mode or a receive mode as appropriate. The DCE respond
