CN114501172B - Carrier-grade network switches - Google Patents

Abstract

The telecommunication grade network switch is a 2U/1.5U high frame device, and is composed of two sub-network switches. According to the requirement of client networking, the two sub-network exchanges can be set as two independent network exchanges, and each sub-network exchange performs a network exchange function; or setting two sub-network switches as the telecommunication grade network switches for mutual protection switching, when one of the sub-network switches fails, the control processor monitors, detects and processes the hardware line, and the low-speed interface unit of the control processor can be rapidly switched to the other sub-network switch without interrupting the transmission work of the traffic. According to the method, all units and modules are switched through the high-speed backboard, and maintenance or update work of the units or modules can be provided without interrupting the work of the switch.

Description

Carrier-grade network switches

Technical Field

This disclosure document is about a telecommunications-grade network switch, and more particularly about a network switch with a 2U/1.5U height frame and hot-swap protection switching function. Each low-speed interface unit in the 2U height frame supports 16 optical interfaces; each low-speed interface unit in the 1.5U height frame supports 8 optical interfaces.

Background technique

Currently, most of the network switches used by data service providers are designed with industrial-grade hardware circuits. Except for the power supply and fan parts that have hot-swap protection switching, the most important high-speed interface/high-speed network switching processing/control processing unit and low-speed interface unit do not have hot-swap protection switching functions. In order to achieve the requirements of high transmission reliability, two sets of network switches are generally connected to each other and transmission protection switching is performed through independent control equipment (also known as high availability), which does not meet the needs of traditional telecom operators.

In traditional telecommunications service companies, all telecommunications equipment needs to be designed with the highest reliability (equipment reaches 99.999% reliability, and the average service interruption time per year shall not exceed 5 minutes and 15 seconds). In the data center of a data service provider, it is composed of multiple network switches, which are connected to each other by high-speed optical cables. (Equipment reaches 99.9% reliability, and the average service interruption time per year shall not exceed 8 hours and 46 minutes) When a problem or failure occurs in one of the switches, the control center will detect the location of the faulty switch and issue a command to switch the data flow to the normal switch to continue to provide communication services. Since the number of switches controlled by the control center is large and scattered in various places, it may not be possible to detect the location of the faulty equipment in time and make correct processing immediately, resulting in inconsistent protection switching time, so it cannot meet certain special communication requirements, such as the 1ms protection switching requirement in ultra-reliable low latency communication (URLLC) in the 5G system.

Summary of the invention

In one embodiment of the disclosed document, a telecommunications-grade network switch is composed of two sub-network switches. According to the customer's networking requirements, the two sub-network switches can be set as two independent network switches; or the two sub-network switches can be set as telecommunications-grade network switches that perform mutual protection switching. When one of them fails, the hardware line is monitored, detected and processed by the control processor to quickly perform switching. For example, when the high-speed interface interface/high-speed network switching processing/control processing unit in the first sub-network switch fails, its relatively low-speed interface unit will be switched to the second sub-network switch to continue to perform the sending and receiving of information; vice versa.

In another embodiment of the disclosed document, two sub-network switches are set as telecommunication-grade network switches that perform mutual protection switching. When a certain interface in a certain low-speed interface unit in the first sub-network switch fails, this interface will be switched to the corresponding interface in the high-speed interface/high-speed network switching processing/control processing unit in the second sub-network switch to continue to perform the sending and receiving of traffic. If several interfaces in the low-speed interface unit in the first sub-network switch fail, they will also be switched to the corresponding interface in the high-speed interface/high-speed network switching processing/control processing unit in the second sub-network switch at the same time.

The present invention is a telecommunications-grade network switch, comprising: a machine frame, wherein the height of the machine frame is 2U or 1.5U; and a first sub-network switch and a second sub-network switch, which are arranged in the machine frame, wherein the first sub-network switch and the second sub-network switch have the same function, so that the first sub-network switch and the second sub-network switch can be set as two independent switches or telecommunications-grade switches with protection switching.

Preferably, the server and switch functions are integrated into one, which is suitable for multi-access edge computing (MEC).

Preferably, the frame further includes a fan cooling module and multiple units, including an AC-DC power conversion unit, a DC-DC power conversion unit, a first sub-network switch low-speed interface unit, a second sub-network switch low-speed interface unit, a first sub-network switch high-speed interface/high-speed network switching processing/control processing unit, a second sub-network switch high-speed interface/high-speed network switching processing/control processing unit and a network management and satellite navigation clock signal interface unit, wherein the units and the fan cooling module are configured with various interfaces, switches and status displays (LEDs) on the front panel of the frame (All Front-Access).

Preferably, each of the units and the fan heat dissipation module is composed of a printed circuit board (PCB), and the units and the fan heat dissipation module are connected via a high-speed signal switching circuit backplane.

Preferably, the unit and the fan heat dissipation module have hot-swap functionality.

Preferably, a one-to-one hardware protection switching function can be provided, wherein when the high-speed interface interface/high-speed network switching processing/control processing unit of the first sub-network switch is damaged, the low-speed interface unit of the first sub-network switch will automatically switch to the high-speed network switching chip in the second sub-network switch, and the traffic transmitted by the lower-layer network device will be transmitted to the high-speed network switching chip in the second sub-network switch via the low-speed interface unit of the first sub-network switch for execution.

Preferably, the protection switching time of the one-to-one hardware protection switching function is less than 1 millisecond (1 ms).

Preferably, a one-plus-one hardware protection switching function can be provided, wherein when the high-speed interface interface/high-speed network switching processing/control processing unit of the first sub-network switch is damaged, the low-speed interface unit of the first sub-network switch will automatically switch to the high-speed network switching chip in the second sub-network switch, and the traffic transmitted by the lower-layer network device will be transmitted to the high-speed network switching chip in the first sub-network switch and the high-speed network switching chip in the second sub-network switch via the low-speed interface unit of the first sub-network switch and the low-speed interface unit of the second sub-network switch respectively for execution.

Preferably, the hardware protection switching time of the one-plus-one hardware protection switching function is less than 1 millisecond (1 ms).

Preferably, the downlink traffic is transmitted from the front half interface of the high-speed network switch chip in the first sub-network switch via the low-speed interface unit of the first sub-network switch to the next layer of network equipment, and from the rear half interface of the high-speed network switch chip in the second sub-network switch via the low-speed interface unit of the second sub-network switch to the next layer of network equipment.

Preferably, when one of the interfaces in the high-speed network switch chip of the high-speed interface interface/high-speed network switching processing/control processing unit in the first sub-network switch fails, the low-speed interface interface unit of the first sub-network switch switches from the current path to the backup path, and the input traffic is transmitted via the backup path to the corresponding interface of the high-speed network switch chip in the high-speed interface interface/high-speed network switching processing/control processing unit in the second sub-network switch.

Preferably, the high-speed interface and the low-speed interface are used to provide a local loop test function (Local Loop Test Feature).

Preferably, the high-speed interface and the low-speed interface are used to provide a remote loop test function (RemoteLoop Test Feature).

Preferably, it further includes analog signal output and input interfaces.

In summary, each of the two sub-network switches in a telecom-grade network switch has a control processor that monitors its own working status at any time. If the control processor detects hardware failure information in the switch, or alarm information generated by a high-speed switching chip due to a software problem, it will immediately process and notify the other party's control processor of the information. After the two jointly judge, the transmission path selector is started to switch the low-speed interface unit to the normal sub-network switch. This includes the switching of the high-speed interface/high-speed network switching processing/control processing unit and the switching of the low-speed interface unit.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a carrier-grade network switching system according to an embodiment of the present disclosure.

FIG. 2 is a functional block diagram of a network switch according to an embodiment of the present disclosure.

FIG. 3 is a detailed functional block diagram of a network switch according to an embodiment of the present disclosure.

FIG. 4 is a schematic diagram illustrating an operation of a network switch according to an embodiment of the present disclosure.

FIG. 5 is a schematic diagram illustrating an operation of a network switch according to an embodiment of the present disclosure.

FIG. 6 is a schematic diagram illustrating an operation of a network switch according to an embodiment of the present disclosure.

FIG. 7 is a flow chart of an operation method according to an embodiment of the present disclosure.

【Main component symbol description】

10: Telecom-grade network switch

20: AC-DC power conversion unit

30: DC-DC power conversion unit

40: Management and satellite navigation clock signal interface unit

50: Fan cooling module

100: Telecom-grade network switch

120a: first sub-network switch low-speed interface unit

120b: Second sub-network switch low-speed interface unit

130a: First sub-network switch high-speed interface/high-speed network switching processing/control processing unit

130b: Second sub-network switch high-speed interface/high-speed network switching processing/control processing unit

121: Low-speed interface transceiver

122: Transmission path selector

131a, 131b: High-speed network switching chips

132: Control processor

133: High-speed interface transceiver

140: High-speed signal transfer circuit backplane

200: How to operate

S210, S220, S230: Steps

H1: Height

L1: Length

W1: Width

Detailed ways

The words "including", "having", etc. used in this article are open-ended terms, which mean "including but not limited to". In addition, "and/or" used in this article includes any one or more items in the relevant enumerated items and all combinations thereof.

In this document, when an element is referred to as "connected" or "coupled", it may refer to "electrical connection" or "electrical coupling". "Connected" or "coupled" can also be used to indicate the coordinated operation or interaction between two or more elements. In addition, although the terms "first", "second", etc. are used in this document to describe different elements, the terms are only used to distinguish between elements or operations described by the same technical terms. Unless the context clearly indicates otherwise, the terms do not specifically refer to or imply an order or sequence, nor are they used to limit this disclosure document.

Please refer to FIG1 , which is a schematic diagram of a telecom-grade network switch 10 according to an embodiment of the present disclosure. The telecom-grade network switch 10 is mounted in a frame with a height H1, a length L1 and a width W1, and the system frame includes an AC-DC power conversion unit 20, a DC-DC power conversion unit 30, a first sub-network switch low-speed interface unit 120a, a second sub-network switch low-speed interface unit 120b, a first sub-network switch high-speed interface/high-speed network switching processing/control processing unit 130a, a second sub-network switch high-speed interface/high-speed network switching processing/control processing unit 130b, a network management and satellite navigation clock signal interface unit 40, a fan heat dissipation module 50 and a high-speed signal switching circuit backplane 140.

As shown in FIG. 1 , the frame design of the telecom-grade network switch 10 is an all-front-access design, including hot-swap of the power conversion unit, hot-swap of the low-speed interface unit, hot-swap of the high-speed interface/high-speed network switching processing/control processing unit, and hot-swap of the fan module. The above-mentioned various units and modules are directly inserted into the high-speed signal switching circuit backplane 140 to form a complete telecom-grade network switch 100. At the same time, through the hot-swap of the unit, the maintenance and replacement of the unit and the module are carried out without interrupting the switch's communication service.

In one embodiment, the height H1, length L1 and width W1 are respectively not higher than (including) 2U height (1U = 1 rack unit = 1.75 inches), 10 inches length and 19 inches width. The height, length and width of the network switching system 10 are not limited to the above and can be adjusted according to actual conditions. The power conversion unit can be any combination of an AC-DC conversion circuit unit or a DC-DC conversion circuit unit.

Please refer to FIG. 2, which is a functional block diagram of a telecommunications-grade network switch 100 according to an embodiment of the present disclosure. The first sub-network switch 110a includes a low-speed interface unit 120a and a high-speed interface/high-speed network switching processing/control processing unit 130a, and the second sub-network switch 110b includes a low-speed interface unit 120b and a high-speed interface/high-speed network switching processing/control processing unit 130b. The above-mentioned units and modules are connected through a high-speed signal switching circuit backplane 140. The detailed operation will be described later.

Please refer to FIG3, which shows a detailed functional block diagram of a telecommunications-grade network switch 100 according to an embodiment of the present disclosure. The low-speed interface unit 120a in the first sub-network switch and the low-speed interface unit 120b in the second sub-network switch each include a low-speed interface transceiver 121 and a transmission path selector 122. For the convenience of explanation, FIG3 only shows 6 sets of low-speed interface transceivers 121 and transmission path selectors 122, but the number of low-speed interface transceivers 121 and transmission path selectors 122 is not limited to this and can be adjusted according to actual conditions.

The low-speed interface transceiver 121 is used to send and receive traffic, and the transmission path selector 122 is used to control the input traffic to be transmitted to the high-speed interface/high-speed network switching processing/control processing unit 130a in the first sub-network switch 110a or the high-speed interface/high-speed network switching processing/control processing unit 130b in the second sub-network switch 110b via the high-speed signal switching circuit backplane 140. For downlink traffic, the transmission path selector 122 selects the traffic transmission path as the current path (first path) or the backup path (second path) according to the system working status of the telecommunication-grade network switch 100. For the uplink traffic sent from the next layer of network equipment, the transmission path selector 122 can be used to allow the input traffic to be transmitted simultaneously (1+1 protection mode) or individually (1:1 protection mode) to the high-speed interface interface/high-speed network switching processing/control processing unit 130a in the first sub-network switch 110a and the high-speed interface interface/high-speed network switching processing/control processing unit 130b in the second sub-network switch 110b via the first path and the second path.

In one embodiment, the low-speed interface transceiver 121 may be a 10 Gbps/25 Gbps/40 Gbps/100 Gbps physical layer interface transceiver having IEEE 1588v2 precise clock synchronization function and supporting multi-layer network protocol operation modes.

The high-speed interface/high-speed network switching processing/control processing unit 130a in the first sub-network switch and the high-speed interface/high-speed network switching processing/control processing unit 130b in the second sub-network switch each include a high-speed network switching chip 131a, 131b, a control processor 132 and a high-speed interface transceiver 133. The data packet transmitted from the upper layer network device is transmitted via the high-speed interface transceiver 133, and is transmitted to the high-speed network switching chip 131a, 131b, where the data packet is disassembled and processed, and the data is repackaged according to the requirements of the IEEE specification, and transmitted to the corresponding output port according to the network setting address, and then transmitted to the transmission path selector 122 through the high-speed signal switching circuit backplane 140, and finally transmitted to the next layer network device via the low-speed interface transceiver 121. On the contrary, the data packets transmitted by the next layer of network equipment are transmitted to the high-speed network switching chips 131a and 131b through the low-speed interface transceiver 121 and the transmission path selector 122, through the high-speed signal switching circuit backplane 140, and then transmitted to the upper layer of network equipment through the high-speed interface transceiver 133 after processing. The information generated by the line monitoring point in each sub-network switch is collected and processed by the FPGA and then transmitted to the control processor 132. The two control processors 132 in the telecommunications-grade network switch 100 are connected by a 10Gbps or PCI e interface, and they inform each other of the information they have collected at any time to activate the transmission path of the transmission path selector 122.

In one embodiment, the high-speed network switching chips 131a, 131b can be 100Gbps/400Gbps network switches, which are used to perform packet processing, switching and transmission between low-speed (10Gbps/25Gbps/40Gbps/100Gbps) communications and high-speed (100Gbps/400Gbps) communications, and have network layer 2 (data link layer) switching functions and network layer 3 (network layer) router functions, and support virtual network architecture (network functions virtualization, NFV) functions.

In one embodiment, the high-speed network switch chips 131a and 131b of the high-speed interface interface/high-speed network switching processing/control processing unit 130a in the first sub-network switch and the high-speed interface interface/high-speed network switching processing/control processing unit 130b in the second sub-network switch each have two high-speed stacking ports. The high-speed network switch chip 131a and the high-speed network switch chip 131b are stacked together to form a high-speed interface port, such as a 100Gbps stacking port, so as to stack the two high-speed network switch chips 131a and 131b. When the high-speed interface of the high-speed network switch chip 131a of the high-speed interface interface/high-speed network switch processing/control processing unit 130a in the first sub-network switch is congested, a portion of the packets will be sent to the stacking port of the high-speed network switch chip 131a of the high-speed interface interface/high-speed network switch processing/control processing unit 130a in the second sub-network switch via the high-speed interface port of the high-speed network switch chip 131a in the first sub-network switch/high-speed network switch processing/control processing unit 130b, and then transmitted to the upper layer network device via the high-speed interface transceiver 133 via the high-speed interface port of the high-speed network switch chip 131b of the high-speed interface interface/high-speed network switch processing/control processing unit 130b in the second sub-network switch.

In one embodiment, the control processor 132 can be a central processing unit, a microprocessor or other processors with system management, monitoring, setting and maintenance functions, and has the computing function of IEEE 1588v2 1-step PTP (precision time protocol) precise synchronization clock algorithm, such as Intel X86 series or ARM based processors. The control processor 132 is used for telecommunications and the identification and execution of protection switching conditions of the network switch 100.

In one embodiment, the high-speed interface transceiver 133 can be a 100Gbps physical layer interface transceiver, which uses four groups of 25Gbps data streams to form a 100Gbps signal, or eight groups of 50Gbps data streams to form a 400Gbps signal, has IEEE 1588v2 precise clock synchronization function and supports multi-layer network protocol operation mode.

Please refer to FIG4, which is a schematic diagram of the operation of a telecommunication-grade network switch 100 according to an embodiment of the present disclosure. Under normal operation, the telecommunication-grade network switch 100 receives the traffic transmitted by the input next-layer network device via the low-speed interface unit 120a or the low-speed interface transceiver 121 of the low-speed interface unit 120b. By switching to the active path by the transmission path selector 122, the input traffic in the low-speed interface unit 120a in the first sub-network switch is transmitted to the high-speed signal switching circuit backplane 140 and then to the high-speed interface interface/high-speed network switching processing/control processing unit 130a via the active path, and the input traffic in the low-speed interface unit 120b in the second sub-network switch is transmitted to the high-speed signal switching circuit backplane 140 and then to the high-speed interface interface/high-speed network switching processing/control processing unit 130b via the active path.

After receiving the input traffic, the high-speed network switch chip 131a in the high-speed interface/high-speed network switch processing/control processing unit 130a in the first sub-network switch transmits the traffic to the high-speed interface transceiver 133 after processing, and transmits the traffic to the upper network device via the high-speed interface transceiver 133. Similarly, after receiving the input traffic, the high-speed network switch chip 131b in the high-speed interface/high-speed network switch processing/control processing unit 130b in the second sub-network switch transmits the traffic to the high-speed interface transceiver 133 after processing, and transmits the traffic to the upper network device via the high-speed interface transceiver 133. In FIG4 , the current path (first path) is represented by a solid line as the path for transmitting the input traffic, and the backup path (second path) is represented by a dotted line as the path for not transmitting the input traffic.

Please refer to FIG5, which is a schematic diagram of the operation of a telecom-grade network switch 100 according to an embodiment of the present disclosure. When an interface of the telecom-grade network switch 100 fails, for example, when the second interface of the high-speed network switch chip 131a of the high-speed interface interface/high-speed network switching processing/control processing unit 130a in the first sub-network switch fails, the second channel of the low-speed interface unit 120a will be switched from the current path to the backup path via the second transmission path selector 122, and then the input traffic is transmitted to the second interface of the high-speed network switch chip 131b in the high-speed interface interface/high-speed network switching processing/control processing unit 130b in the second sub-network switch via the backup path to complete the subsequent operation. The number of failed interfaces is not limited to one. When multiple interfaces fail, the corresponding transmission path selectors 122 of the failed interfaces can quickly switch to the backup path to complete the subsequent operation.

On the contrary, when the second interface of the high-speed network switch chip 131b of the high-speed interface interface/high-speed network switching processing/control processing unit 130b in the second sub-network switch fails, the second channel of the low-speed interface unit 120b will be switched from the current path to the backup path via the second transmission path selector 122, and then the input traffic will be transmitted to the second interface of the high-speed network switch chip 131a in the high-speed interface interface/high-speed network switching processing/control processing unit 130a in the first sub-network switch via the backup path to complete the subsequent operation. The number of failed interfaces is not limited to one. When multiple interfaces fail, the corresponding switch transmission path selectors 122 of the failed interfaces can quickly switch to the backup path to complete the subsequent operation.

Please refer to FIG6, which is a schematic diagram of the operation of high-speed network switch chips 131a and 131b according to an embodiment of the present disclosure. When the high-speed network switch chips 131a and 131b in the telecommunication and network switch 100 fail, for example, the high-speed network switch chip 131a in the high-speed interface/high-speed network switch processing/control processing unit 130a in the first sub-network switch fails, all the transmission path selectors 122 in the low-speed interface unit 120a in the first sub-network switch will switch to the backup path (second path), so that the input traffic entering the low-speed interface unit 120a will be transmitted to the interface of the high-speed interface/high-speed network switch processing/control processing unit 130b in the second sub-network switch via the backup path, and then the high-speed network switch chip 131b in the high-speed interface/high-speed network switch processing/control processing unit 130b completes the subsequent operation.

On the contrary, when the high-speed network switch chip 131b in the high-speed interface/high-speed network switching processing/control processing unit 130b in the second sub-network switch fails, all the transmission path selectors 122 in the low-speed interface unit 120b in the second sub-network switch will switch to the backup path (the second path), so that the input traffic entering the low-speed interface unit 120b will be transmitted to the interface of the high-speed interface/high-speed network switching processing/control processing unit 130a in the first sub-network switch via the backup path, and then the high-speed network switch chip 131a in the high-speed interface/high-speed network switching processing/control processing unit 130a will complete the subsequent operations.

In one embodiment, the control processor 132 (set as the master control processor, Master) in the high-speed interface/high-speed network switching processing/control processing unit 130a in the first sub-network switch and the control processor 132 (set as the slave control processor, Sl ave) in the high-speed interface/high-speed network switching processing/control processing unit 130b in the second sub-network switch are connected by a 10Gbps network channel. The two control processors 132 will back up all parameters of each other during operation. When the first sub-network switch 110a fails, the control processor 132 starts protection switching. The second sub-network switch 110b takes over the traffic of the first sub-network switch 110a, and its control processor 132 continues to monitor the system operation, and its role changes from Sl ave to Master. And vice versa.

In one embodiment, the telecommunications grade network switch 100 can provide a user with a one-to-one usage mode. When in the one-to-one usage mode, the traffic transmitted by the upper layer network device is transmitted to the first sub-network switch 110a and the second sub-network switch 110b respectively. After being controlled and processed by the control processor 132 in the two network switches, if the high-speed interface interface/high-speed network switching processing/control processing units 130a and 130b in the two sub-network switches are in a normal state, the downlink traffic is transmitted from the first half (e.g., the 1st to 8th or the 1st to the 16th) interface of the high-speed network switch chip 131a in the first sub-network switch 110a to the next layer network device via the low-speed interface unit 120a, and the second half (e.g., the 9th to the 16th or the 17th to the 32nd) interface of the high-speed network switch chip 131b in the second sub-network switch is transmitted to the next layer network device via the low-speed interface unit 120b. If the high-speed interface/high-speed network switching processing/control processing unit 130a in the first sub-network system is damaged, its low-speed interface unit 120a will be switched to the front half (e.g., 1st to 8th or 1st to 16th) interface of the high-speed network switching chip 131b in the second sub-network switch to continue to perform the sending and receiving of traffic. The traffic transmitted by the lower-layer network device is transmitted to the front half (e.g., 1st to 8th or 1st to 16th) interface and the rear half (e.g., 9th to 16th or 17th to 32nd) interface of the high-speed network switching chip 131b in the second sub-network switch 110b through the low-speed interface units 120a and 120b, respectively. Vice versa.

In one embodiment, the telecommunications grade network switch 100 can provide a user with a one-plus-one usage mode. When the one-plus-one usage mode is set, the traffic transmitted by the upper layer network device is simultaneously transmitted to the first sub-network switch 110a and the second sub-network switch 110b. After being controlled and processed by the control processor 132 in the two network switches, if the high-speed interface interface/high-speed network switching processing/control processing units 130a and 130b in the two sub-network switches are in a normal state, the downlink traffic is respectively transmitted from the first half (e.g., the 1st to 8th or the 1st to the 16th) interface of the high-speed network switching chip 131a in the first sub-network switch via the low-speed interface unit 120a to the lower layer network device, and the second half (e.g., the 9th to the 16th or the 17th to the 32nd) interface of the high-speed network switching chip 131b in the second sub-network switch is transmitted to the lower layer network device via the low-speed interface unit 120b. If the high-speed interface/high-speed network switching processing/control processing unit 130a in the first sub-network system is damaged, its low-speed interface unit 120a will be switched to the first half (e.g., the 1st to 8th or 1st to 16th) interface of the high-speed network switching chip 131b in the second sub-network switch to continue to send and receive traffic. Regardless of the status of the first sub-network switch 110a or the second sub-network switch 110b, the traffic transmitted by the lower-layer network device is transmitted to the high-speed network switching chips 131a and 131b in the two sub-network switches 110a and 110b respectively through the low-speed interface units 120a and 120b to continue to perform subsequent work.

In one embodiment, the low-speed interface transceiver 121 and the high-speed interface transceiver 133 have a signal generator and a checker for system diagnostic test, and can perform functions such as near-end loopback test, far-end loopback test and high-speed signal eye diagram monitoring.

In one embodiment, the transmission path selector 122 has functions such as clock signal capture (clock recovery), signal regeneration (re-timing), differential signal (differential signal) polarity inversion setting, random signal (pseudo-random binary sequence, PRBS) generator and high-speed signal eye diagram monitoring, which is suitable for system testing and parameter adjustment.

In one embodiment, the telecommunications-grade network switching system 10 is equipped with a multi-GNSS receiver module, which can receive signals from the United States' Global Positioning System GPS, Russia's GLONASS, China's BeiDou Satellite Navigation System, and the European Union's Galileo Positioning System, and demodulate 1PPS (Pu l se Per Second) and 10 MHz precision signals as reference signal sources for the IEEE 1588v2 1-Step PTP precision clock synchronization network.

Please refer to FIG. 7, which is a flow chart of an operation method 200 according to an embodiment of the present disclosure. To make the operation method 200 shown in FIG. 7 easier to understand, please also refer to FIG. 3. The operation method 200 includes steps S210, S220, and S230. Step S210, transmitting input traffic to the first sub-network switch 110a through the current path or transmitting input traffic to the second sub-network switch 110b through the current path. Step S220, when the first sub-network switch 110a fails, controlling the second sub-network switch device 110b to receive input traffic. Step S230, when the second sub-network switch device 110b fails, controlling the first sub-network switch device 110a to receive input traffic.

In summary, the network switch uses a dual architecture to achieve high reliability at the telecom level and a high-speed network switch platform with backup fast protection switching functions. At the same time, it builds a high-speed transmission switching network synchronized with the satellite navigation precision clock, with IEEE 1588v2 1-step PTP packet synchronization protocol and Sync E synchronous network architecture functions.

The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims (8)

1. A telecommunications grade network switch, comprising:

a frame, wherein the frame height is 2U or 1.5U; and

A first sub-network switch and a second sub-network switch disposed within the frame, wherein the first sub-network switch and the second sub-network switch have the same function, such that the first sub-network switch and the second sub-network switch can be configured as two independent switches or a telecom class switch with protection switching,

Wherein the frame further comprises a fan heat dissipation module and a plurality of units, including an AC-DC power conversion unit, a DC-DC power conversion unit, a first sub-network switch low-speed interface unit, a second sub-network switch low-speed interface unit, a first sub-network switch high-speed interface/high-speed network exchange processing/control processing unit, a second sub-network switch high-speed interface/high-speed network exchange processing/control processing unit, and a network management and satellite navigation clock signal interface unit, wherein the units and the fan heat dissipation module are configured and various interfaces, switches and states are displayed on the front panel of the frame,

The interfaces of the high-speed network exchange chip in the first sub-network switch and the interfaces of the high-speed network exchange chip in the second sub-network switch are divided into a first half interface and a second half interface, wherein downstream traffic is respectively transmitted from the first half interface of the high-speed network exchange chip in the first sub-network switch to the next-layer network device through the first sub-network switch low-speed interface unit, and from the second half interface of the high-speed network exchange chip in the second sub-network switch to the next-layer network device through the second sub-network switch low-speed interface unit.

2. The telecommunications grade network switch of claim 1 wherein the unit and the fan module are hot swappable.

3. The telecommunications grade network switch of claim 1 wherein a one-to-one hardware protection switching function is provided, wherein when the first subnetwork switch high speed interface/high speed network switch process/control process unit is damaged, the first subnetwork switch low speed interface unit automatically switches to the high speed network switch chip in the second subnetwork switch, and traffic carried by the underlying network device is carried out by the high speed network switch chip in the second subnetwork switch via the first subnetwork switch low speed interface unit.

4. The switch of claim 1, wherein a hardware protection switching function is provided, wherein when the first subnetwork switch high speed interface/high speed network switch processing/control processing unit is damaged, the first subnetwork switch low speed interface unit automatically switches to the high speed network switch chip in the second subnetwork switch, and the traffic transmitted by the underlying network device is simultaneously transmitted to the high speed network switch chip in the first subnetwork switch and the high speed network switch chip in the second subnetwork switch via the first subnetwork switch low speed interface unit and the second subnetwork switch low speed interface unit, respectively.

5. The telecommunications grade network switch of claim 1 wherein when one of the interfaces in the high speed network switch chip in the first subnetwork switch fails, the first subnetwork switch low speed interface unit switches from an active path to a standby path via which incoming traffic is routed to the corresponding interface of the high speed network switch chip in the second subnetwork switch.

6. The telecommunications grade network switch of claim 1, further comprising a high speed interface transceiver and a low speed interface transceiver for providing near-end loop-back test functionality.

7. The telecommunications grade network switch of claim 1, further comprising a high speed interface transceiver and a low speed interface transceiver for providing remote tieback test functions.

8. The telecommunications grade network switch of claim 1 further comprising analog signal output and input interfaces.