This standard specifies the 25-pin connector used in the interface between data terminal equipment (DTE) and data circuit terminating equipment (DCE) or parallel automatic calling equipment (ACE) and the allocation of contact numbers. This standard applies to voice band modems, public data network (PDN) facilities, telegraph signal converters and automatic calling equipment of symbols GB3454 and GB3455. In the case of connection with PDN via GB11592 interface, the function of the interface circuit shall comply with GB11594. In the case of V2.0 type outstation interface, the electrical characteristics shall comply with CCITT Recommendation V.31 or V.31bis. This standard also provides the dimensions of the connector housing, and gives the locking method of the locking device (locking block) and the method of connector shielding. GB/T 15125-1994 Information Technology Data Communication 25-pin DTE/DCE Interface Connector and Contact Number Allocation GB/T15125-1994 Standard Download Decompression Password: www.bzxz.net

National Standard of the People's Republic of China
Information technology-Data communication 25-pole DTE/DCE interface connector and contact number assignments
Information technology-Data communication 25-pole DTE/DCE interface eonnector andcontact number assignments
GB/T 1512594
1S0 21101989
This standard is equivalent to the international standard IS02110-1989 Information technology data communication 25-pin DTE/DEC interface connector and contact number assignments".
1 Subject content and scope of application
This standard specifies the 25-pin connector and its contact number assignments used on the interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) or parallel automatic calling equipment (ACE). This standard applies to voice band modems, public data network (PDN) facilities, telegraph signal converters and mobile calling equipment that comply with GB3454 and GB3455. In the case of connection to PDN via GB11592 interface II, the function of the interface circuit shall comply with GB11594. In the case of V2.0 type outstation interface, the electrical characteristics shall comply with CCITI Recommendation V.31 or V.31bis. This standard also provides the dimensions of the connector housing, and gives the locking method of the locking device (locking block) and the method of connector shielding. 2 Reference standards
GB193 Common thread diameter and pitch series (ISO261)GB3454 Interface circuit definition table between data terminal equipment (DTE) and data circuit terminating equipment (DCE) (CCITT Recommendation V.24)
GB3455 Electrical characteristics of unbalanced dual-stream interface circuits (CCITT Recommendation V.28)GB4210 Terminology of electromechanical components for electronic equipment (IF50 (581)) Standardized 300ait/s full-duplex modem for use in the telephone automatic switching network (CCITT Recommendation V.21)GB 7620
GB GB 7621 Standardized 1200 bit/s dual-T modem for use on automatic telephone switching networks and point-to-point two-wire leased telephone type circuits (CCITT Recommendation V.22)
Standardized 600/120C baud modem for use on automatic telephone switching networks (CCITT Recommendation V.23) GB 7622
Automatic answering equipment and (or) parallel automatic calling equipment on automatic telephone switching networks, including manual and automatic establishment GB 7623
Procedure for disabling echo control devices during calls (CCITT Recommendation V.25) Standardized 2400 bit/s modem for use on four-wire leased telephone type circuits (CCITT Recommendation V.26) GB 7624
Standardized 2400/1200 bit/s modem for use on automatic telephone switching network (CCITT Recommendation GB7625
Standardized 4800 bit/s modem with manual equalizer for use on leased telephone type circuits (CCITT GB76261
Construction V.27)
GB11592 Interface between data terminal equipment (ETE) and data circuit terminating equipment (DCE) for start-stop transmission services on public data networks (CCITT Recommendation X.20) Approved by the State Administration of Technical Supervision on July 16, 1994..com Implementation on March 1, 1995
CB/T 15125-94
GB11594 Interchange circuit definition table between data terminal equipment (DTE) and data circuit terminating equipment (DCE) on public data networks (CCITT Recommendation X.20) 24)
GB11599 Data terminal equipment (DCE) interfaced with synchronous V-series modems for use on public data networks (CCITT Recommendation X.21big)
GB11600 Data terminal equipment (DCE) interfaced with asynchronous duplex V-series modems for use on public data networks (CCITT Recommendation X. 20 bis)
GB/T15123 Information processing data communications DTE/1XCE interface standby control operation using 25-pin connector (ISO8480)
IEC8072 Rectangular connectors for frequencies below 3MHz Part 2: Detailed specification for connectors with non-detachable tweezer-welded circular contacts
CCITT Recommendation S.16 Automatic terminals connected to user telegraph networks using V.24 DTE/DCE interface Parallel data transmission modems using telephone signal frequencies CCITT Recommendation V.19
CCITT Construction V.20
Standardized parallel data transmission modem for use on the automatic switching telephone network CCITT Recommendation V. 22 bis
Standardized 2 400 bit/s full-duplex modem using frequency division technology on the automatic switching telephone network and point-to-point two-wire leased telephone type circuits CCITT Recommendation V.25 bis
Automatic calling and/or answering equipment using 100 series interchange circuits on the automatic switching telephone network (GSTN)
CCITT Recommendation V. 26 tcr
Standardized 2 400 bit/s duplex modem using cross-wave cancellation technology on the automatic switching telephone network and point-to-point two-wire leased telephone type circuits CCITT Recommendation V.27bisStandardized 4800 bit/s modem with automatic equalizer for use on leased telephone type circuits
Standardized 4800/2400 bit/s modem for use on the automatic switching telephone network CCITT Recommendation V. 27 ter
CCITT Recommendation V.29
Standardized 9600 bit/s modem for use on point-to-point four-wire leased telephone type circuitsCC[TT Recommendation V.31 Electrical characteristics of single-stream switching circuits using contact closure controlCCITT Recommendation V.31bis Electrical characteristics of single-stream up-conversion circuits using optocouplersCCITT Recommendation V.32 Two-wire duplex modem operating at data signal rates up to 9600 bit/s for use on automatic switching telephone networks and leased telephone type circuits
CCITT Recommendation V. 33
3 Standardized 14400 bit/s modem for use on point-to-point four-wire leased telephone type circuits3 Definitions
3.1 Cable adaptercableadaptor
An accessory or part consisting of a hard shell attached to a connector. It can be connected to a cable clamp or a seal that terminates the shield and can be shielded from electrical interference. Its appearance is straight or angled. 3.2 Connector housing Connector part with insulating mounting plate and contacts. 3.3 Contact arrangement The number, spacing and distribution of contacts in the connector. 3.4 Female contact Female contact Accepts the insertion of male contact and connects the electrical connection on the inner surface. 3.5 Intermateable connectors Refers to two connectors that have the ability to connect electrically and mechanically, regardless of their technical performance and installation interchangeability. 3.6 Locking device Locking device Parts that keep their mating parts in a mechanically locked state in certain components. 3.7 Male contact GB/T 15125—94 Inserts female contact and connects the electrical connection on the outer surface 3.8 N-pole connector N-pole connector Component used to terminate the conductor, so as to provide it with the corresponding mating component for connection and disconnection. 4 Connectors
A 25-pin connector should be provided for the DTE/DCE interface. If a parallel automatic calling device conforming to GB7623 is used, it should be provided with an independent 25-pin connector.
Figures 1 to 6 show a 25-pin connector. Only the main dimensions of the mating are shown in the figure. 0
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Figure 1DTE connector
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GB/T15125—94
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GB/T 15125—94
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Figure 3 Contact distance size
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GB/T 15125—94
Figure 5 Female Contact
Note: 1) When the male contact is mated with the female contact, in order to ensure good electrical connection, appropriate pressure should be applied to the female contact. Figure 1 shows a DTE connector with 25 male contacts in the connector housing. Figure 2 shows a DCE connector with 25 female contacts in the connector housing. The inner mating dimensions of the connector housing on the DCE connector and the connector housing on the DTF connector are marked (see Figures 1 and 2). The numbering of the contacts is specified in Figures 1 and 2. Figure 3 shows the dimensions of the connector spacing. Figures 4 and 5 show the dimensions of the male and female contacts, respectively. The DCE connector can be equipped with a locking device consisting of two locking blocks as specified in Figure 6. Since the locking block has a screw hole that can act as a nut, the DTE connector can be equipped with a locking rod device for locking the DTE connector, or it can be equipped with a screw for inserting into the locking screw hole.
The locking block shall use M3 threads as specified in Figure 6. To ensure that the connectors fit together, sufficient connector sizes are provided in this standard. They comply with the IEC807-2 connector detail specifications.
In Appendix A (reference), a diagram showing the finger clearance area is given to provide guidance to equipment designers. Figure A1 shows the maximum DTE connector profile including all means of locking the locking block. Figure A2 Indicates the minimum spacing of C-connector holes when using multiple interface layouts.
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GB/T15125—94
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2 decimal places ± 0.51;
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Figure 6 IE connector with lock block
5 Assignment of contact numbers
Assignment of contact numbers is shown in Table 1.
The elimination of interchange circuits is listed in Table 2. The provision and use of interchange circuits shall be consistent with the national standards in the header of Table 1 and the corresponding CCITT recommendations.
GB/T 15125—94
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GB/T 15125—94
Reserved for international standardization, and no country shall occupy the contact parts. F
Circuit 108/1 or circuit 103/2.
Note: 1) Contact No. 1 is used to connect the shield of the cascaded components of the shielded interface cable. According to national regulations, the screen can be connected to the protective ground or signal ground of the ITE or DCE or both. According to national safety regulations, the signal ground can be further connected to the protective ground. Be careful to prevent the establishment of a ground loop with large current when doing so.
2) Wherever there is a signal code element timing in [XCF-, contact No. 15 is used for circuit 114 and contact No. 17 is used for circuit 115. 3) The receiving data circuit 104 is designated as A1-~-A1, 131~B4 and C1-C4, which correspond to the relevant frequencies respectively. 4) The sending data circuit 103 is designated as A1~A3, B1~B3 and C1C3, which correspond to the relevant frequencies respectively. According to V.31, contact No. 13 is used as the common return line.
5) Contact No. 2 is reserved for domestic use: contact No. 2 is used where there is circuit 110 in the LCE. 6) The electrical characteristics of circuits 191 and 192 are subject to the V.19 and V.20 specifications. 7) The interchange circuit function complies with GR11594. This column only involves GB11592 type DTE with GB3455 electrical characteristics, because it can be connected to the IDCE of GB 11592/GB 7618. 8) The CI column is for synchronous modems without a reverse channel. 9) The (2 column is used for synchronous modems with a reverse channel. 10) This column does not apply to V.25bis, because in this case, the call establishment information is transmitted on circuit 103. 11) Wherever GR/T15123 is implemented, contact No. 14 is used for circuit 116/1 or 116/2, and contact No. 16 is used for circuit 117. 12) Where asymmetric full-duplex, L-operation designed DCE is used [e.g., telematic 5ervicex7, A-station DCE with only data channel transmitter and reverse channel receiver and B-station CE with only data channel receiver and reverse channel transmitter, in the above-mentioned LDCE, it is allowed to connect the interface circuit of the reverse channel to the contacts of the data channel: in the A-station TXCF: circuit 119 is connected to contact No. 3, and circuit 122 is connected to contact No. 8. In the H-station DCE: circuit 118 is connected to contact No. 2. Circuit 121 is connected to contact No. 5. Table 2 Interchange circuit table
Circuit number
Signal ground or common return
Send data
Receive data
Request to send
Ready to sendbZxz.net
Data equipment ready
Connect data equipment to line
Data terminal ready
Data channel receiving line signal detector
Data signal quality detector
Data signal rate selector (DTE source)
Data signal rate selector (TCF source)
Transmitter signal code element timing (ITE source)
Transmitter signal code element timing (DCE source)
Receiver signal code,Meta timing (DCE source)
Direct mode standby switching
Authorized mode standby switching
Standby equipment indicator
Reverse channel send data
Reverse back channel receive data
Send reverse channel line signal
Circuit number
Connector shield
GB/T 15125--94
Continued Table 2
Reverse channel ready
Reverse channel receive line signal detector
Select frequency group
Call indicator
Select send call rate
Request receive
Send reverse tone
Receive character timing
This loopback is non-data mode
Loopback/maintenance test
Local loopback
Test indicator
Send speech answer
Receive speech answer
Signal Ground or common return
Data line busy
Remote station connected
Call abandoned
Digital signal (2\)
Digital signal (2')
Digital signal (22)
Mathematical signal (2\)
Present - digital
Digital emperor present
Power indication
Signal conductor ground or common return
Connector shielding is optional. If used, metal connector shells should be used on both DTE connectors and IXCE connectors to achieve connector shielding.
GB/T15125-94
Appendix A
Finger clearance diagram
(reference)
This appendix provides guidance for equipment designers regarding finger clearance. Figure A1 shows the maximum outline diagram of the DTE connector. Area occupied by locking bag and cable
Clip
DTE connector
ICE connector
Figure A1 Maximum outline of DTE connector
113max
Figure A2 shows the minimum recommended spacing between multiple DCE connectors, taking into account the different locking devices (locking rods, screws) of DCE connectors.
Additional instructions:
GE/T 15125—94
Figure A2 Minimum spacing between DCE connectors
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Electronic Standardization Institute of the Ministry of Machinery and Electronics Industry. 55-3
This standard was drafted by the Electronic Standardization Institute of the Ministry of Machinery and Electronics Industry and the North China Institute of Computing Technology of the Ministry of Machinery and Electrical Industry. The main drafters of this standard are Huang Jiaying, Zhang Baodong, Wang Runsheng, and Ye Shaozhi. From the date of implementation of this standard, the original People's Republic of China electrical industry standard 5J/7.9101-87 Data Communication IDCE Interface Connector and Pin Assignment" shall be abolished.
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