RU175722U1 - Ethernet switch - Google Patents

Abstract

The utility model relates to data transmission systems, in particular, to a modular scalable structure for building switches of fast Ethernet networks. 1. A device containing N single-port communication modules as part of a media access control unit (MAC & RISC CPU), an RS-232 interface connected to a MAC & RISC CPU, a dual-port random access memory (DPRAM), dynamic random access memory (DRAM), program read-only memory (EPROM), a system bus connected to the MAC & RISC CPU, DPRAM, DRAM and EPROM, a direct memory access module (DMA) that interacts with dynamic random access memory (DRAM), a frame allocation logic unit that interacts with din By means of dynamic random access memory (DRAM), a high-speed data bus, an arbitration bus, and a control bus serving N single-port communication modules, an additional SFP module connected to a media access control unit (MAC & RISC CPU), IP block has been additionally introduced to ensure its stable and uninterrupted operation monitoring, N outputs / inputs of which are connected to the corresponding N outputs / inputs of N single-port communication modules, a power supply system consisting of: a microcontroller, read-only memory (ROM), operational memory go device (RAM), information input unit, information output unit, interconnected by address and data bus, remote monitoring and control unit (BDKU), the first output of which is connected to the second input of the information input unit, the first input - with N + 1 output monitoring IP block, and the third input - with the second output of the information output unit, a load measurement unit, the first output of which is connected to the second input of the remote control and control unit, and the second output - with the first input of the information input unit, power control unit, the first input of which is connected to the first output of the information output unit, an uninterruptible power supply, the first output of which is connected to the second input of the power control unit, the second output - with the third input of the information input unit, and the input - with the third output of the information output unit, switched power supply unit the first input of which is connected to the output of the power control unit, and the output - to the input of the load measurement unit, a controlled relay unit, the input of which is connected to the second output of the remote control and control unit Niya, and the output - to the second input of the switched pitaniya.2 sources. The device according to claim 1, characterized in that all its elements are made using digital technology.

Description

The utility model relates to data transmission systems, in particular to a modular scalable structure for building switches of fast Ethernet networks.

Known Ethernet switches contain N (depending on the number of input ports) single-port communication modules as part of the access control unit for the transmission medium, RS-232 interface, two port random access memory, dynamic random access memory, software read-only memory, system bus, module direct access to the memory, frame distribution logic block, high-speed data bus, arbitration and control bus, serving N single-port communication modules, and a power supply.

Among them, we can distinguish switches from Cisco, D-Link, Qtech, and many others.

However, these switches in the event of a power outage do not provide their further operation and status monitoring.

The technical result of the utility model is to increase the reliability of the Ethernet switch in a changing voltage supply network or its complete absence.

A significant impact on the sustainable operation of the switches is provided by power sources. To increase the reliability of power supply to the switches, backup power is used. In particular, D-Link Ethernet switches use redundant power supplies (RPS) with a connector for connecting to an AC or DC power source (depending on the model) and a connector for connecting to an internal switch power source. This connection allows you to provide uninterrupted power in the event of an unexpected failure of the internal power source of the switch, which may entail the shutdown of the switch itself, devices connected to its ports, or the entire network. By providing the output power necessary for the switch to operate, RPS can improve the reliability of the device’s power supply.

RPS continuously monitors the status of the internal power supply. In the event of a power outage, the redundant power supply immediately starts, so the LAN switch and devices connected to it can continue to work. This increases the fault tolerance of the network infrastructure and protects against interruption of the network connection due to a failure of the switch power supply.

However, the presence of a backup power source, if it, like the switch itself, is connected to the same mains supply, does not exclude cases of partial or complete power outage, which naturally leads to a decrease in the stability of the network infrastructure.

The closest technical solution is the device described in patent No. 2257678 of January 31, 2001 - a prototype.

This switch contains N single-port communication modules as part of a medium access control unit (MAC & RISC CPU), an RS-232 interface connected to a MAC & RISC CPU, a dual-port random access memory (DPRAM), dynamic random access memory (DRAM), and software read-only memory (EPROM), a system bus associated with the MAC & RISC CPU, DPRAM, DRAM and EPROM, a direct memory access module (DMA) interacting with dynamic random access memory (DRAM), a frame allocation logic unit interacting with dynamic random access memory (DRAM), high-speed data bus, arbitration and control bus, serving N single-port communication modules, power supply.

The purpose of the utility model is to monitor the state and increase the reliability of the switch in conditions of changing voltage of the supply network and its absence.

This goal is achieved in that in a device containing N single-port communication modules as part of a medium access control unit (MAC & RISC CPU), an RS-232 interface connected to a MAC & RISC CPU, a dual-port random access memory (DPRAM), dynamic random access memory ( DRAM), software read-only memory (EPROM), system bus associated with MAC & RISC CPU, DPRAM, DRAM and EPROM, direct memory access module (DMA), interacting with dynamic random access memory (DRAM), distribution logic block dividing frames, interacting with dynamic random access memory (DRAM), high-speed data bus, arbitration and control bus, serving N single-port communication modules, power supply, additionally introduced SFP module connected to the media access control unit (MAC & RISC CPU), block IP monitoring, N outputs / inputs of which are connected to the corresponding N outputs / inputs of N single-port communication modules, a power supply system consisting of: a microcontroller, read-only memory (ROM), random access memory go device (RAM), information input unit, information output unit, interconnected by address and data bus, remote monitoring and control unit (BDKU), the first output of which is connected to the second input of the information input unit, the first input - with N + 1 output monitoring IP block, and the third input - with the second output of the information output unit, a load measurement unit, the first output of which is connected to the second input of the remote control and control unit, and the second output - with the first input of the information input unit, power control unit, the first input of which is connected to the first output of the information output unit, an uninterruptible power supply, the first output of which is connected to the second input of the power control unit, the second output - with the third input of the information input unit, and the input - with 3 output of the information output unit, switched power supply unit the first input of which is connected to the output of the power control unit, and the output - to the input of the load measurement unit, a controlled relay unit, the input of which is connected to the second output of the remote control and control unit, and in output - with the second input of the switching power supply unit.

Comparison with the prototype shows that the inventive device is characterized by the presence of new units and their connections between them. Thus, the claimed device meets the criterion of "novelty."

Comparison of the proposed solution with other technical solutions shows that the listed elements used in the blocks are known, however, their introduction in this connection with the other elements leads to the solution of a new problem of monitoring the state of the switch and increasing the reliability of its operation in the changing voltage of the supply network. This confirms the conformity of the technical solution to the criterion of "significant differences".

In FIG. 1 presents a general diagram of the proposed device, in FIG. 2 is a block diagram of a switch power system; FIG. 3 is a possible implementation of a power control unit, and in FIG. 4 - structure of the block of switched power supplies.

The device includes: N single-port communication modules consisting of: SFP block 1, MAC & RISC CPU block 2, DPRAM block 3, logical frame allocation block 4, EPROM block 5, DRAM block 6, DMA7 block, RS-232 interface 8, system bus 9, high-speed data bus 10, arbitration and control bus 11, IP monitoring unit 12, display unit 14, power supply system 13 consisting of: microcontroller 13-1, uninterruptible power supply (UPS) 13-7, switched power supply unit 13-11 included power supply unit BP1 and power supply unit BP2, remote monitoring and control unit (BDKU) 13-10, load measuring unit ( IN) 13-9, power control unit (BOOM) 13-8, information output unit 13-2, information input unit 13-3, address and data bus 13-6, read-only memory (ROM) 13-4, random access memory device (RAM) 13-5, a block of controlled relays 13-12.

The device operates as follows.

Ethernet signals are fed to each direction via fiber optic communication lines (FOCL) (Fig. 1). An SFP module is used as a transceiver (transceiver) 1. Transceiver 1 is connected to Ethernet.

In the MAC & RISC CPU 2 unit, which is responsible for the structuring and processing of incoming Ethernet frames, the central processing unit CPU performs step-by-step execution in each cycle of the reduced set instruction. Block 8 is a serial interface according to the RS-232 protocol with asynchronous start and stop bits and parity corresponding to the COM interface of a personal computer. The MAC & RISC CPU 2 unit is connected via a system bus 9, for example, consisting of 32 bits, on the one hand, with a dual-port random access memory (DPRAM) 3, and on the other hand, with a dynamic random access memory (DRAM) 6, which interacts with Functional module for direct access to memory (DMA) 7, which transfers “memory - memory” independently of CPU 2. Erasable software read-only memory (EPROM) 5 is connected via system bus 9 to CPU 2, DRAM 6 and DPRAM 3, and the subsequent logic frame allocation 4, service one unit vectors communication modules 1 ... N, forming the Ethernet switch connected on the one hand, with the high speed data bus 10, and on the other hand - to a bus 11 arbitration and control.

For redundant power use a parallel connection of several power sources, eliminating the mutual influence of one source on another. As a backup power source, a battery or accumulator is usually used having a voltage known to be lower than that of the main power source.

First of all, the load is supplied with power from the main source, which usually (to implement the function of self-switching to backup power) has a higher voltage. As such a source, the mains voltage (via the power supply) is most often used.

If one of several power supply devices is damaged or disconnected, the load will automatically and without breaking the power circuit connect to an additional power source.

To build reliable power backup systems, it is necessary to provide several functions: parallel connection of alternative power supplies with isolation, protection against overloads both during operation and during hot-swapping of power supplies in the system.

To connect the load to several power sources at the same time with the ability to work only from one of them using ORing technology.

ORing is a mounting “OR” of several power supplies for alternative load power (device). In fact, it is a multi-channel power bus switch, providing isolation between power sources, low losses during the passage of current, safe connection / disconnection of any of the sources and the load itself. This function is used in devices of increased reliability with redundant power supply, as well as in devices with autonomous (battery) power, which are periodically connected to an external network.

If it is necessary to connect the power supply unit BP1 of the switched power supply unit 13-1, the command is sent via the LAN network to the remote monitoring and control unit 13-10. In this case, the corresponding relay is switched on in the controlled relay block 13-12, the contacts of which connect the output of the supply voltage from BP1 to the elements of the switch and signal its connection through the remote control and control unit 13-10. When BP1 is turned on, the load current is calculated in the load measuring unit 13-9, the value of which is transmitted to the remote control and control unit 13-10, as well as via the information input unit 13-3 to the microcontroller 13-1 and then through the address and data bus 13- 6 and the information output unit 13-2 to the remote monitoring and control unit 13-10, and then through the monitoring IP unit 12 to the controlling authority.

The software stored in the memory of the microcontroller 13-1, provides the calculation of the current consumption of consumed electricity, similar to electricity meters. This information is also displayed for each power supply (BP1 and BP2) in the display unit 14, together with the status of the power supplies (BP1, BP2) (on / off). All calculations are carried out in the microcontroller 13-1.

A possible implementation of a power control unit 13-8 is shown in FIG. 3. A triac is used as a control element.

An integral part of the claimed device is an uninterruptible power supply (UPS) 13-7, which supports power supply BP1 and BP2 in the event of a power failure in a centralized network. UPS 13-7 is also under the control of block 13-10 through the circuit: block 13-3 - microcontroller 13-1 - block 13-2 - block 13-10 - LAN network. At the same time, the charge level of the batteries is monitored, their charging is direct, and the UPS 13-7 operating modes are signaled.

The load measuring unit 13-9 can be performed using Hall effect current sensors, compensation type current sensors, or on the ACS712 microassembly.

The remote monitoring and control unit 13-10 is an active network device that performs the reception, transmission and processing of signals based on network protocols (for example, TCP / IP protocols).

Microcontroller 13-1 is an INTEL 80C51 LSI family with a clock frequency of 12-14 MHz.

The read-only memory device (ROM) 13-4 is intended for storing data memory (maximum current consumption of the switch, battery charge current of the UPS 13-7) and commands for the microcontroller 13-1, and is a standard LSI of the INTEL 27C512 family with a capacity of 64 kbytes.

Random access memory (RAM) 13-5 is designed to store information related to the operating mode of the system. RAM is connected to the system bus address and data 13-6 and is a standard LSI INTEL 6264 family with a capacity of 8 kbytes.

Information input / output blocks 13-2, 13-3 are intended for the organization of 8-bit input / output ports of logic level signals.

They are connected to the system bus 13-6 and is a parallel bit register.

Thus, the considered technical solution ensures uninterrupted operation of the switch, power consumption control and wireless on / off control. power supplies, providing status monitoring and increasing the overall reliability of its operation in conditions of changing voltage of the supply network or its complete absence.

Claims (2)

1. Ethernet switch containing N single-port communication modules as part of a medium access control unit (MAC & RISC CPU), an RS-232 interface connected to a MAC & RISC CPU, two-port random access memory (DPRAM), dynamic random access memory (DRAM), software read-only memory (EPROM), system bus associated with MAC & RISC CPU, DPRAM, DRAM and EPROM, direct memory access module (DMA), interacting with dynamic random access memory (DRAM), frame allocation logic block, interacting with dynamic random access memory (DRAM), a high-speed data bus, an arbitration bus, and a control bus serving N single-port communication modules, an additional SFP module connected to a media access control unit (MAC & RISC CPU) is additionally introduced to ensure its stable and uninterrupted operation IP monitoring, N outputs / inputs of which are connected to the corresponding N outputs / inputs of N single-port communication modules, a power supply system consisting of: a microcontroller, read-only memory (ROM), RAM a sinking device (RAM), an information input unit, an information output unit, interconnected by an address and data bus, a remote monitoring and control unit (BDKU), the first output of which is connected to the second input of the information input unit, the first input - with N + 1 output monitoring IP block, and the third input - with the second output of the information output unit, a load measuring unit, the first output of which is connected to the second input of the remote control and control unit, and the second output - with the first input of the information input unit, the power control unit a bridge, the first input of which is connected to the first output of the information output unit, an uninterruptible power supply, the first output of which is connected to the second input of the power control unit, the second output - with the third input of the information input unit, and the input - with the third output of the information output unit, switching unit power supplies, the first input of which is connected to the output of the power control unit, and the output to the input of the load measurement unit, a controlled relay unit, the input of which is connected to the second output of the remote control unit and board, while the output - to the second input of the switched power supplies. 2. Ethernet switch under item 1, characterized in that all its elements are made using digital technology.

Images