CN104092669A - Ethernet-V.35 protocol converter based on CPCI board - Google Patents

Abstract

The invention discloses an Ethernet-V.35 protocol converter based on a CPCI board, comprising an Ethernet and advanced data link conversion module, a V.35 logic interface conversion module, a V.35 clock generation module, and a V.35 interface Level conversion, CPCI network card implementation module, microcontroller monitoring circuit module and Ethernet physical layer signal interconnection module, the V.35 logic interface conversion module is connected with the Ethernet and advanced data link conversion module, and the Described V.35 clock generation module is connected with described V.35 logical interface conversion module, and described V.35 interface level conversion module is connected with described V.35 logical interface conversion module, and described CPCI network card realizes module It is connected with the Ethernet physical layer signal interconnection module, and the microcontroller monitoring circuit module is connected with the Ethernet and advanced data link conversion module. The invention is built in the CPCI case, can realize the conversion from the Ethernet interface to the V.35 interface, and has good system communication reliability and strong recoverability.

Description

Ethernet-V.35 protocol converter based on CPCI board

technical field

The invention relates to a data transmission interface converter, in particular to a CPCI board-based Ethernet interface to V. 35 interface protocol converter. the

Background technique

Ethernet (Ethernet) is a computer local area network networking technology, which is based on the IEEE802.3 standard formulated by IEEE, which specifies the contents of the physical layer connection, electrical signal and medium access layer protocol. No matter what kind of Ethernet, its MAC (Media Access Control) layer uses a contention-based media access control protocol. Ethernet is currently the most widely used LAN technology, and it largely replaces other LAN standards. the

V． The 35 interface is a high-speed synchronous data interface, a modem equipment standard for 48kbit/S data remote transmission of 6O-108kHz base group circuits. V． Compared with other interfaces in the telecommunication network, the 35 interface has highly reliable connectivity, and supports longer transmission distance and higher data rate than the asynchronous serial port, so it is widely used in routers, data acquisition systems, multimedia video terminals, such as In institutions such as bank networking, power system communication, and railway communication systems that require high reliability and high security for information communication. the

Therefore, completing the conversion of the above two different interfaces has great practical significance for realizing the interconnection between the Ethernet network and other networks and the expansion of the local area network. the

Contents of the invention

The purpose of the present invention is to provide a CPCI board-based Ethernet-V. 35 protocol converter, built in the CPCI chassis, has the characteristics of stable performance. the

In order to achieve the purpose of the above invention, the technical solution adopted in the present invention is: a CPCI board-based Ethernet-V. 35 protocol converters, including Ethernet and advanced data link conversion modules, V. 35 logical interface conversion module, V. 35 clock generation module, V. 35 interface level conversion, CPCI network card implementation module, microcontroller monitoring circuit module and Ethernet physical layer signal interconnection module, said V. 35. The logical interface conversion module is connected to the Ethernet and advanced data link conversion module, and the V. 35 clock generation module and the V. 35 logical interface conversion modules are connected, the V. 35 interface level conversion module and the V. 35 logic interface conversion modules are connected, the CPCI network card realization module is connected with the Ethernet physical layer signal interconnection module, and the microcontroller monitoring circuit module is connected with the Ethernet and advanced data link conversion module. the

In the above technical solution, the Ethernet and advanced data link conversion module is a communication application specific integrated circuit. the

In a further technical solution, the communication ASIC is externally connected with an SDRAM as a buffer. the

In the above technical solution, said V. The 35 logic interface conversion modules include complex programmable logic devices (CPLDs). the

In the above technical solution, said V. 35 clock generation modules including complex programmable logic devices (CPLD). the

In the above technical solution, said V. 35 interface level conversion module adopts SP319 chip to complete TTL level to V. 35 level conversion required by the interface. the

In the above technical solution, the CPCI network card implementation module is an Ethernet controller with a PCI bus. the

Due to the use of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art:

1. The invention adopts the Ethernet controller with PCI bus to realize the CPCI network card module, which reduces the driver development and increases the reliability of the communication system.

2. The present invention uses a microprocessor to monitor the communication system, thereby ensuring the stable operation of the system and increasing the recoverability of the system. the

3. The present invention uses complex programmable logic devices to complete the advanced data link control interface to V. 35 conversion of logic interface and generation V. 35 interface logic and V． Nx64K clock required for 35 interfaces. the

Description of drawings

Fig. 1 is a schematic diagram of the system of the present invention in the first embodiment. the

Fig. 2 is V of the present invention in embodiment one. 35 interface logic block diagram. the

Fig. 3 is a functional block diagram of the Nx64K clock of the present invention in Embodiment 1. the

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

Embodiment 1: Referring to FIG. 1 , a CPCI board-based Ethernet-V. 35 protocol converters, including Ethernet and advanced data link conversion modules, V. 35 logical interface conversion module, V. 35 clock generation module, V. 35 interface level conversion, CPCI network card implementation module, microcontroller monitoring circuit module and Ethernet physical layer signal interconnection module, said V. 35. The logical interface conversion module is connected to the Ethernet and advanced data link conversion module, and the V. 35 clock generation module and the V. 35 logical interface conversion modules are connected, the V. 35 interface level conversion module and the V. 35 logic interface conversion modules are connected, the CPCI network card realization module is connected with the Ethernet physical layer signal interconnection module, and the microcontroller monitoring circuit module is connected with the Ethernet and advanced data link conversion module.

The Ethernet and advanced data link conversion module is realized by a communication application-specific integrated circuit. The present invention selects the RC7222 chip to realize the conversion of the Ethernet frame and the advanced data link control frame, and configures 8M SDRAM as the data for the RC7222 simultaneously. buffer. the

The microcontroller monitoring circuit module includes an ARM microprocessor, which is used to communicate with the RC7222 chip through a serial communication mode, and constantly reads the internal working status of the RC7222. If there is an exception, the ARM microprocessor will restart the RC7222, thereby Ensure that the system is recoverable. the

The V. 35 logical interface conversion module, V. The 35 interface is a high-speed synchronous interface, and now only the physical layer circuit and electrical properties are described, while the interface left to the user by the multifunctional Ethernet converter RC7222 is a link layer HDLC interface. Therefore, V. 35 logical interface conversion modules realize the conversion between the above-mentioned two kinds of interfaces, use hardware description language, realize logic as shown in Figure 2 in CPLD, thereby allow the remapping of two kinds of interface signals, the CPLD that the present invention selects is Altera company's MAX3128A. the

The V. 35 clock generation module, V. The 35 interface is a synchronous communication interface, and its data transmission speed is Nx64Kbps rate, where N can be 1 to 32, so we need to generate a clock whose frequency can be adjusted linearly. To generate such a clock, we need to use DDS (direct digital synthesis) ) principle, that is, direct digital synthesis technology. Since we only need to realize the output of a square wave, we don't need a DAC, and a comparator is used to replace the ROM, as shown in Figure 3. the

The CPCI network card realization module is used to realize the CPCO bus interface, and includes a standard CPCI connector, which can be inserted into a CPCI slot in the CPCI chassis. the

The V. 35 interface level conversion module is used to realize V. The level required by the 35 interface, including the standard DB25 connector, is used to connect with other V. 35 devices are connected. the

Claims (7)

1. An Ethernet-V based on CPCI board. 35 protocol converters, characterized in that: including Ethernet and advanced data link conversion modules, V. 35 logical interface conversion module, V. 35 clock generation module, V. 35 interface level conversion, CPCI network card implementation module, microcontroller monitoring circuit module and Ethernet physical layer signal interconnection module, said V. 35. The logical interface conversion module is connected to the Ethernet and advanced data link conversion module, and the V. 35 clock generation module and the V. 35 logical interface conversion modules are connected, the V. 35 interface level conversion module and the V. 35 logic interface conversion modules are connected, the CPCI network card realization module is connected with the Ethernet physical layer signal interconnection module, and the microcontroller monitoring circuit module is connected with the Ethernet and advanced data link conversion module. 2. A kind of Ethernet-V based on CPCI board according to claim 1. 35 protocol converter, characterized in that: the Ethernet and advanced data link conversion module is a communication application-specific integrated circuit. 3. A kind of Ethernet-V based on CPCI board according to claim 2. 35. The protocol converter is characterized in that: the communication ASIC is externally connected with an SDRAM. 4. A kind of Ethernet-V based on CPCI board according to claim 1. 35 protocol converter, characterized in that: said V. The 35 logic interface conversion modules include complex programmable logic devices (CPLDs). 5. A kind of Ethernet-V based on CPCI board according to claim 1. 35 protocol converter, characterized in that: said V. 35 clock generation modules including complex programmable logic devices (CPLD). 6. A kind of Ethernet-V based on CPCI board according to claim 1. 35 protocol converter, characterized in that: said V. 35 interface level conversion module adopts SP319 chip. 7. A kind of Ethernet-V based on CPCI board according to claim 1. 35 protocol converter, characterized in that: said CPCI network card realization module is an Ethernet controller with PCI bus.