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1、 TIA STANDARD ANSI/TIA/EIA-723-1998 Approved: September 4, 1998 Reaffirmed: May 20, 2003 High Speed 232 Type DTE/DCE Interface TIA-723 SEPTEMBER 1998 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing the telecommunications industry in association with the Electronic Industries Alliance NOTICE TIA
2、 Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the pro
3、per 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 Public
4、ations preclude their voluntary use by Non-TIA members, either domestically or internationally. Standards and Publications are adopted by TIA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, TIA does not assume any liability to any patent owner, nor
5、does it assume any obligation whatever to parties adopting the Standard or Publication. Further details of the development process are available in the TIA Engineering Manual, located at http:/www.tiaonline.org/standards/sfg/engineering_manual.cfm This Standard does not purport to address all safety
6、 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 health practices and to determine the applicability of regulatory limitations before its use. (From Standards Proposal No. 3-3855-RF1
7、, formulated under the cognizance of the TIA TR-30.2 Subcommittee on DTE-DCE Interfaces and Protocols.) This Document was reaffirmed by the American National Standards Institute (ANSI) on May 20, 2003 and by the TIA. Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 1998 Standards and Technology
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22、 Canada 1-800-854-7179, International (303) 397-7956 STD-EIA TIA-723-ENGL 1978 3234b00 Ob05011 28T m TINEIA-723 HIGH SPEED 232 TYPE DTWDCE INTERFACE (From Standards Proposal No . 3855 formulated under the cognizance of TIA Subcommittee TR-30.2 on Data Transmission Interfaces) Contents Page 1 SCOPE .
23、 1 1 . 1 Section abstracts . 1 1.2 Application 1 1.3 Serialization 1 1.4 Synchronoushonsynchronous communication . 1 1.5 Classes of service . 1 2 NORMATIVE REFERENCES . 1 3 SIGNAL CHARACTERISTICS 2 3.1 Electrical characteristics 2 3.2 Protective ground (frame ground) . 2 3.3 Shield (25 and 26-positi
24、on connectors) . 2 3.4 Circuit grounding (Signal Common) 2 3.5 “Fail Safe” operation 3 3.6 General signal characteristics . 3 3.6.1 Distortion . 3 3.6.2 Timing . 3 4 INTERFACE MECHANICAL CHARACTERISTICS . 5 4.1 Definition of mechanical interface 5 4.2 25-position interface connector . . 5 4.3 Alt A
25、26-position interface connector . 5 4.4 Alt B 9-position interface connector . 6 i TINEIA-723 4.5 Connector contact assignments 16 5 FUNCTIONAL DESCRIPTION OF INTERCHANGE CIRCUITS 17 5.1 5.2 5.3 5.3.1 5.3.2 5.3.3 5.3.4 5.3.5 5.3.6 5.3.7 5.3.8 5.3.9 5.3.1 O 5.3.1 1 5.3.12 5.3.1 3 5.3.14 5.3.1 5 5.3.1
26、 6 5.3.1 7 5.3.18 5.3.1 9 5.3.20 5.3.21 5.3.22 General . 17 Classifications of circuits . 17 Definitions of interchange circuits 17 Circuit AB . Signal Common 17 Circuit BA . Transmitted Data 18 Circuit BB . Received Data 19 Circuit CA - Request to Send 19 Circuit CB - Clear to Send . 20 Circuit CC
27、- DCE Ready 20 Circuit CD . DTE Ready 21 Circuit CE - Ring Indicator . 22 Circuit CF - Received Line Signal Detector 22 Circuit CJ - Ready for Receiving 22 Circuit CK - Received Energy Present . 23 Circuit LL - Local Loopback . 23 Circuit RL - Remote Loopback . 24 Circuit TM - Test Mode 24 Circuit D
28、A - Transmitter Signal Element Timing ( D E Source) 24 Circuit DB - Transmitter Signal Element Timing (DCE Source) 25 Circuit DD - Receiver Signal Element Timing (DCE Source) . 25 Circuit SBA - Secondary Transmitted Data 26 Circuit SBB - Secondary Received Data 26 Circuit SCA . Secondary Request to
29、Send 26 Circuit SCB - Secondary Clear to Send . 26 Circuit SCF - Secondary Received Line Signal Detector . 26 6 RECOMMENDATIONS AND EXPLANATORY NOTES 27 6.1 Line signals . 27 6.2 Use of circuits for testing . 27 6.2.1 Local loopback 28 6.2.2 . Remote loopback 28 6.2.3 Test mode . 29 6.3 Use of Circu
30、it LL for “Busy Out“ 29 L Annex A (informative) . 30 ii TINEIA-723 FOREWORD (This foreword is not part of this Standard.) This standard was developed to provide a DTE/DCE interface, similar to TINEIA-232, operating at data rates up to 512 kbit/s. It is interoperable with TINEIA-232-F and TINEIA-687
31、at lower data rates. This interface provides three different connectors: the standard 25-pin connector, Alternative A 26-pin full function connector and Alternative B 9-pin for non-synchronous use . 111 STD-EIA TIA”723-ENGL 1998 m 3234b00 Ob05014 T77 W TINEIA-723 I SCOPE I .I Section abstracts This
32、Standard is applicable to the interconnection of data terminal equipment (DTE) and data circuit-terminating equipment (DCE) employing serial binary data interchange with control information exchanged on separate control circuits. It defines: Section 2 NORMATIVE REFERENCES Section 3 SIGNAL CHARACTERI
33、STICS Section 4 INTERFACE MECHANICAL CHARACTERISTICS Section 5 FUNCTIONAL DESCRIPTION OF INTERCHANGE CIRCUITS Section 6 RECOMMENDATIONS AND EXPLANATORY NOTES I .2 Application This Standard applies where equipment on one side of the DTUDCE interface is intended for connection directly to equipment on
34、 the other side without additional technical considerations. Applications where cable termination, signal waveshaping, interconnection cable distance, and mechanical configurations of the interface must be tailored to meet specific user needs are not precluded but are beyond the scope of this Standa
35、rd. I .3 Serialization This Standard applies to data communication systems where the data is bit serialized. No restrictions are placed on the sequence of bits. 1.4 Synchronoushonsynchronous sommunication This Standard applies to both synchronous and nonsynchronous serial binary data communications
36、systems. I .!i Classes o f service This Standard applies to switched, nonswitched, dedicated, leased or private line service. Consideration is given to both point-to-point and multipoint operation. 2 NORMATIVE REFERENCES The following standards contain provisions which, through reference in this tex
37、t, constitute 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 1 TINE
38、IA-723 indicated below. ANSI and TIA maintain registers of currently valid national standards published by them. ANSIKINEIA-334-B Signal Quality at Interface Between Data Terminal Equipment and Synchronous Data Cinuit-Terminating Equipment for Serial Data Transmission ANSITTINEIA-404-B Standard for
39、Statt-Stop Signal Quality for Non-Synchronous Data Terminal Equipment ANSITTINEIA-694 Electrical Characteristics of Unbalanced Digital lnterface for Signaling Rates up to 512 kbWs 3 SIGNAL CHARACTERISTICS 3.1 Electrical characteristics The electrical characteristic of the interchange circuits are sp
40、ecified in ANSITTINEIA-694. The meaning of circuit conditions “ON“ and “OFF“ for control and timing circuits, and “O“, “I“, “MARK“, and “SPACE“ for data circuits, shall be as defined in ANSITTINEIA-694. 3.2 Protective ground (frame ground) In DTEs and in DCEs, protective ground is a point that is el
41、ectrically bonded to the equipment frame. It may also be connected to external grounds (e.g., through the third wire of the power cord). It should be noted that protective ground (frame ground) is not an interchange circuit in this Standard. If bonding of the equipment frames of the DCE and the DTE
42、is necessary, a separate conductor should be used that conforms to the appropriate national or local regulation applying to wire size and color coding. 3.3 Shield (25 and 2:bposition connectors) In order to facilitate the use of shielded interconnecting cable, interface connector contact number 1 is
43、 assigned for this purpose. This will permit the cable associated with the DTE to be composed of tandem connectorized sections with continuity of the shield accomplished by connection through this contact in the connectors. Normally the DCE should make no connection to interface connector contact nu
44、mber 1. It is recognized that for certain electromagnetic interference (EMI) suppression situations, additional provisions may be necessary but are beyond the scope of this Standard. 3.4 Circuit grounding (Signal Common) Proper operation of the interchange circuits requires the presence of a path be
45、tween the DTE circuit common and the DCE circuit common. This path is obtained by means of two interchange Circuits AB, Signal Commons. Both the DCE and the DTE normally should have 2 TINEIA-723 their circuit common connected to their protective ground through a resistance of 100 ohms (k20%) having
46、a power dissipation rating of one-half watt. Figure 1 illustrates the signal common and grounding arrangement. 3.5 “Fail Safe” operation The receivers of the following interchange circuits: Circuit CC (DCE Ready) Circuit CA (Request to Send) Circuit CD (DTE Ready) shall be used to detect a power-off
47、 condition in the equipment connected across the interface and the disconnection of the interconnection cable. Detection of either of these conditions shall be interpreted as an OFF condition of the interchange circuit. 3.6 General signal characteristics 3.6.1 Distortion Interchange circuits transfe
48、mng data signals across the interface point shall hold the marking (binary ONE) and spacing (binary ZERO) conditions for the total nominal duration of each signal element. Distortion tolerances for synchronous systems are set forth in TINEIA-334-B. Distortion tolerances for nonsynchronous systems ar
49、e set forth in TINEIA-404-B. 3.6.2 Timing Interchange circuits transferring timing signals across the interface point shall hold ON and OFF conditions for nominally equal periods of time consistent with acceptable tolerances as specified in TINEIA-334-B. Accuracy and stability of the timing information on Circuit DD (Receiver Signal Element Timing) is required only when Circuit CF (Received Line Signal Detector) is in the ON condition. Drift during the OFF condition of Circuit CF is acceptable: however, resynchronization of the timing information on Circuit DD must be acco
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