CN207704430U - A kind of CPU telecommunication circuits based on DB9 interfaces - Google Patents
A kind of CPU telecommunication circuits based on DB9 interfaces Download PDFInfo
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- CN207704430U CN207704430U CN201820052489.0U CN201820052489U CN207704430U CN 207704430 U CN207704430 U CN 207704430U CN 201820052489 U CN201820052489 U CN 201820052489U CN 207704430 U CN207704430 U CN 207704430U
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Abstract
The utility model discloses a kind of CPU telecommunication circuits based on DB9 interfaces, including serial port chip, network interface chip and DB9 connectors on CPU, RU circuit board, and for serial port chip according to protocol definition, DB9 connectors are 19 pins of standard, it is characterised in that：The TX of serial port chip is connected to the pin 2 of DB9 connectors, and the RX of serial port chip is connected to the pin 3 of DB9 connectors, and GND is connected to the pin 5 of DB9 connectors；TX+, TX, RX+, RX during the 10/100Base T of network interface chip are defined are connected to pin 6, pin 7, pin 8, the pin 9 of DB9 connectors.Because this DB9 interface on RU circuit boards define be not a standard definition, need to redesign an individual circuit board (Debug), realize the network interface and serial communication of CPU in computer and RU.
Description
Technical field
The present invention relates to the design of the network interface and serial communication circuit of cpu chip and peripheral equipment, more particularly to a kind of China
The communication of CPU and peripheral equipment in RU (Remote Unit) equipment of the digital optical fiber repeater system of mobile communication.
Background technology
CPU has the function of network interface and serial ports two and peripheral communications.In RU equipment, research staff can use meter
Calculation machine is communicated by network interface and serial ports with the CPU in RU, is then controlled the operating mode of RU or is inquired the working condition of RU.Root
Two independent network interfaces (RJ45) and serial ports (DB9) interface are separately designed in RU according to traditional design needs.This design scheme
Two interfaces are needed, occupy bigger area on circuit PCB in this way, and need to purchase two kinds of connectors of RJ45 and DB9.
RS232 interface be 1970 by American Electronics Industry Association (EIA) joint Bell System, modem producer and
The standard for serial communication that terminal manufacturer formulates jointly.Its full name be " data terminal equipment (DTE) and
SERIAL BINARY DATA Fabric Interface technical standard between data communications equipment (DCE) ", standard regulation use 25 feet
DB25 connectors, the signal content of each pin of connector is provided, also the level of various signals is provided.
The pin that the serial ports of DB25 is generally only used only have 2 (RXD), 3 (TXD), 7 (GND) these three, with continuously improving for equipment,
Present DB25 needles are seldom seen, instead of he be DB9 interface, the pin ratio DB25 used in DB9 is varied from, and is 2
(TXD), 3 (RXD), 5 (GND) these three.Therefore RS232 interface is all called DB9 now.The pin that DB9 is applied to serial ports is fixed
It is adopted as shown in Figure 1.
10/100 Base-T interfaces of Ethernet are defined in RJ45 interfaces, only use pin 1,2,3,6.It is specifically defined
As shown in Figure 2.
Invention content
For problems of the prior art, purpose of the present invention is to make full use of interface definition of the serial ports in DB9 and
Interface definition of the Ethernet (10/100 Base-T) in RJ45,4 pins (6,7,8,9) idle in DB9 in RJ45
(1,2,3,6) four connection pins of definition use.The space of a RJ45 interface can be saved in this way in circuit design,
The cost of a RJ45 interface can be saved in material procurement.
In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is：A kind of CPU communications based on DB9 interfaces
Circuit, including CPU, serial port chip, network interface chip and DB9 connectors on RU circuit boards, serial port chip according to protocol definition,
DB9 connectors are the 1-9 pins of standard, it is characterised in that：
The TX of serial port chip is connected to the pin 2 of DB9 connectors, and the RX of serial port chip is connected to the pin of DB9 connectors
3, GND are connected to the pin 5 of DB9 connectors；
The 10/100Base-T of network interface chip define in TX+, TX-, RX+, RX- be connected to DB9 connectors pin 6,
Pin 7, pin 8, pin 9, specific connection type are：
TX+ is connected to DB9 pins 6；
TX- is connected to DB9 pins 7；
RX+ is connected to DB9 pins 8；
RX- is connected to DB9 pins 9.
The CPU telecommunication circuits based on DB9 interfaces of the utility model separately add an individual Debug circuit board, real
The network interface and serial communication of existing computer and CPU in RU circuit boards；
There are two DB9 interfaces (DB9_0 and DB9_1) and a RJ45 interfaces on the Debug circuit boards；
Wherein, the DB9_0 interfaces in two DB9 interfaces are connected to the DB9 interfaces on RU circuit boards；
On Debug circuit boards：DB9_0 is connected with DB9_1, and specific connection type is as follows：
The pin 2 of DB9_0 is connected to the pin 2 of DB9_1；
The pin 3 of DB9_0 is connected to the pin 3 of DB9_1；
The pin 5 of DB9_0 is connected to the pin 5 of DB9_1；
On Debug circuit boards, DB9_0 is connected to RJ45, and specific connection type is as follows：
The pin 6 of DB9_0 is connected to the pin 1 of RJ45；
The pin 7 of DB9_0 is connected to the pin 2 of RJ45；
The pin 8 of DB9_0 is connected to the pin 3 of RJ45；
The pin 9 of DB9_0 is connected to the pin 6 of RJ45.
Advantageous effect, 2 advantages of the utility model：
1：The utility model shares DB9 interfaces on the circuit board of RU, while realizing network interface and serial ports and the periphery of CPU
The communication of equipment.The design for saving a RJ45 interface on circuit boards, reduces the complexity of board design, and reduces
Board area.
2：During RU equipment works normally, CPU is not needed to and peripheral communications, and only go wrong scene
Support staff just needs to communicate with the CPU on RU by network interface or serial ports, so RJ45 the and DB9 interfaces on RU are not RU
It is needed in real time in the course of work, it is only necessary to which technical support personnel, which carries a Debug circuit board, can meet work requirements.
The quantity for the Debug circuit boards that technical support personnel needs is far smaller than the sales volume of RU equipment, therefore through the invention, RU
During production, reduces the demand of one RJ45 interface of buying, further reduce buying and production cost.
Description of the drawings
Fig. 1 is the pin definitions figure that DB9 is applied to serial ports in the prior art.
Fig. 2 is that 10/100 Base-T interfaces of Ethernet are defined on RJ45 interface exemplary plots in the prior art.
Fig. 3 is network interface and serial ports design schematic diagram on the RU circuit boards of the utility model.
Fig. 4 is network interface and serial ports design schematic diagram on the circuit board (Debug) of the utility model.
Specific implementation mode
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
In the principle diagram design of RU, two signal wires of TX and RX of serial ports and RX+, RX-, TX+, TX- of network interface are shared
DB9 interfaces.The CPU telecommunication circuits based on DB9 interfaces of the present embodiment, specific implementation mode are as follows：
1：Serial ports is according to protocol definition, 2,3 and 5 feet using DB9 of standard.Specific connection type is as follows：
TX is connected to pin 2, and RX is connected to pin 3, and GND is connected to pin 5.
2：TX+, TX-, RX+, RX- during Ethernet 10/100Base-T is defined are connected to (6,7,8,9) four in DB9
Idle pin.Specific connection type is as follows：
TX+ is connected to DB9 pins 6
TX- is connected to DB9 pins 7
RX+ is connected to DB9 pins 8
RX- is connected to DB9 pins 9
Network interface and serial ports design principle on RU circuit boards is as shown in Figure 3.
Because this DB9 interface on RU circuit boards define be not a standard definition, need redesign one
Individual circuit board (Debug), realizes the network interface and serial communication of computer and CPU in RU.
The implementation concrete mode of this independent circuit board is following (as shown in Figure 4)：
1：There are two DB9 interfaces (DB9_0 and DB9_1) and a RJ45 interfaces on this Debug circuit board.
2：DB9_0 interfaces are connected to the DB9 interfaces on RU circuit boards.
3：On Debug circuit boards：DB9_0 is connected with DB9_1, and specific connection type is as follows：
The pin 2 of DB9_0 is connected to the pin 2 of DB9_1；
The pin 3 of DB9_0 is connected to the pin 3 of DB9_1；
The pin 5 of DB9_0 is connected to the pin 5 of DB9_1；
4：On Debug circuit boards, DB9_0 is connected to RJ45, and specific connection type is as follows：
The pin 6 of DB9_0 is connected to the pin 1 of RJ45；
The pin 7 of DB9_0 is connected to the pin 2 of RJ45；
The pin 8 of DB9_0 is connected to the pin 3 of RJ45；
The pin 9 of DB9_0 is connected to the pin 6 of RJ45.
Above embodiment is only to illustrate the technological thought of the utility model, and the protection of the utility model cannot be limited with this
Range, it is every according to the utility model proposes technological thought, any change done on the basis of technical solution each falls within this
Within claims protection domain of utility model.The technology that the utility model is not directed to can be subject to by existing technology
It realizes.
Claims (2)
1. a kind of CPU telecommunication circuits based on DB9 interfaces, including serial port chip, network interface chip and DB9 on CPU, RU circuit board
Connector, for serial port chip according to protocol definition, DB9 connectors are the 1-9 pins of standard, it is characterised in that：
The TX of serial port chip is connected to the pin 2 of DB9 connectors, and the RX of serial port chip is connected to the pin 3, GND of DB9 connectors
It is connected to the pin 5 of DB9 connectors；
TX+, TX-, RX+, RX- during 10/100 Base-T of network interface chip is defined are connected to pin 6, the pin of DB9 connectors
7, pin 8, pin 9, specific connection type are：
TX+ is connected to DB9 pins 6；
TX- is connected to DB9 pins 7；
RX+ is connected to DB9 pins 8；
RX- is connected to DB9 pins 9.
2. the CPU telecommunication circuits according to claim 1 based on DB9 interfaces, it is characterised in that：Separately add one individually
Debug circuit boards, realize the network interface and serial communication of CPU in computer and RU circuit boards；
There are two DB9 interfaces, respectively DB9_0, DB9_1 and a RJ45 interface on the Debug circuit boards；
Wherein, the DB9_0 interfaces in two DB9 interfaces are connected to the DB9 interfaces on RU circuit boards；
On Debug circuit boards：DB9_0 is connected with DB9_1, and specific connection type is as follows：
The pin 2 of DB9_0 is connected to the pin 2 of DB9_1；
The pin 3 of DB9_0 is connected to the pin 3 of DB9_1；
The pin 5 of DB9_0 is connected to the pin 5 of DB9_1；
On Debug circuit boards, DB9_0 is connected to RJ45, and specific connection type is as follows：
The pin 6 of DB9_0 is connected to the pin 1 of RJ45；
The pin 7 of DB9_0 is connected to the pin 2 of RJ45；
The pin 8 of DB9_0 is connected to the pin 3 of RJ45；
The pin 9 of DB9_0 is connected to the pin 6 of RJ45.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820052489.0U CN207704430U (en) | 2018-01-12 | 2018-01-12 | A kind of CPU telecommunication circuits based on DB9 interfaces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820052489.0U CN207704430U (en) | 2018-01-12 | 2018-01-12 | A kind of CPU telecommunication circuits based on DB9 interfaces |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207704430U true CN207704430U (en) | 2018-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820052489.0U Active CN207704430U (en) | 2018-01-12 | 2018-01-12 | A kind of CPU telecommunication circuits based on DB9 interfaces |
Country Status (1)
| Country | Link |
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| CN (1) | CN207704430U (en) |
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2018
- 2018-01-12 CN CN201820052489.0U patent/CN207704430U/en active Active
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