CN115632740B

CN115632740B - Forward transmission method and system

Info

Publication number: CN115632740B
Application number: CN202211225292.XA
Authority: CN
Inventors: 揭德锋; 吴志远; 谢虎; 李琳
Original assignee: Sino Telecom Technology Co inc
Current assignee: Sino Telecom Technology Co inc
Priority date: 2022-10-09
Filing date: 2022-10-09
Publication date: 2023-11-07
Anticipated expiration: 2042-10-09
Also published as: CN115632740A

Abstract

The application relates to a forward transmission method and a forward transmission system, and relates to the technical field of communication. The forwarding method comprises the steps of performing collection connection on management cards through an active module serving as a management interface, and simultaneously managing multiple connected devices; the active module comprises a CPU, the CPU manages an OTU service card through a connected exchange chip, and real-time monitoring and management are carried out through reading and configuring the optical module; the filter is built in the passive module, the upper wavelength and the lower wavelength of the single-port channel are paired, a COM port is connected with a circuit, a T-MON monitoring port is used for transmitting, and an H-MON monitoring port is used for receiving; the method comprises the steps of connecting OTU+NE equipment based on Ethernet through an NSM network management platform, communicating based on a network port, managing module information and reporting fault alarm information; and (5) carrying out local maintenance and troubleshooting on the fault point through an external display device. The forwarding system can realize more sensitive forwarding networking, effectively establish a set of finished management system, solve the transportation and management difficulties, improve the management efficiency, and facilitate 5G quick networking and convenient management.

Description

Forward transmission method and system

Technical Field

The present application relates to the field of communications technologies, and in particular, to a forwarding method and system.

Background

At present, 5G is used as a new generation mobile communication technology, has the characteristics of large bandwidth, low time delay, mass connection and the like, and can bring revolutionary service experience and a novel business mode for users.

The forwarding is part of the mobile bearer network, and the selection of the 5G forwarding scheme will directly affect investment and construction efficiency of operators, etc. The 5G large-scale construction will cause huge pressure on the aspects of base station optical cable resources, investment, maintenance and management. In terms of optical cable resources, a single 4G base station generally needs to occupy 6/3 core base station optical fibers and main optical fibers, and if a 5G forward transmission mode is adopted only by adopting an optical fiber direct drive mode, larger pressure can be possibly caused on the existing network optical cable. In terms of cost, 5G forwarding equipment costs up to ten thousand yuan, and 5G forwarding will require billions of investment. In terms of maintenance, 5G forwarding involves installation, opening, upgrading and the like of a huge number of DUs/AAUs, and has the greatest influence on maintenance efficiency. According to the deployment strategy of the 5G wireless access network, the network architecture and the bearing requirements of the 5G wireless access network are greatly changed. The radio network bearer network mainly refers to a network that carries radio signals transmitted from base stations to a mobile core network (EPC, evolved Packet Core), and belongs to the category of transmission networks. As shown in fig. 1, the segments from RRU (Radio Remote Unit, remote radio unit) to BBU (Building Base band Unit, baseband processing unit) are forwarded, and the BBU segments are returned to the core network.

The 5G front loading scheme mainly comprises an optical fiber direct drive scheme and a wavelength division equipment loading scheme. The wave division equipment bearing scheme comprises a passive wave division scheme, a WDM scheme and a WDM-PON scheme, and essentially uses wave division technology to bear a plurality of eCPRI links by adopting different wavelengths, and then the eCPRI links are multiplexed into one optical fiber, so that the aim of saving optical fiber resources is achieved. Passive WDM schemes have been widely used in situations where optical fiber conservation is desired, such as 4G forwarding and other distribution cables, insufficient trunk cables, etc. Passive WDM schemes include coarse wavelength division CWDM and dense wavelength division DWDM according to wavelength intervals. As shown in fig. 2, in the 25G CWDM (Coarse Wavelength Division Multiplexing ) forward scheme, a color light module is installed on the AAU and the DU, and two ends of the AAU and the DU are respectively provided with 1 passive multiplexer/demultiplexer, which occupies a 1-core optical cable. Currently, the 25G CWDM scheme in the industry is generally 6 waves or 12 waves, wherein 6 waves are used for 5G forwarding, 12 waves are generally used for mixed transmission of a 4G system and a 5G system, 18 waves can be made at maximum, and wavelength planning is consistent with the low-rate CWDM standard.

Problems with the passive wavelength division scheme include: 1. mainly, passive devices cannot be effectively managed, and a great deal of workload is increased in operation and maintenance. 2. The passive wavelength division scheme is that the optical modules cannot be effectively and uniformly managed, and the abnormal modules at the DU side and the AAU side need corresponding maintenance groups to judge fault points. 3. The channel resources are limited, the CWDM only supports 18 waves at maximum, and the DWDM can support 96 waves and more. Problems with active wavelength division schemes include: 1. the AAU base station needs to also build active equipment, increasing the cost of operation. 2. The management difficulty of the network management is high, a management channel needs to be established at the same time between the AAU base station and the DU machine room, and more resources need to be consumed.

Therefore, it is expected to provide a forwarding method and system, based on the DWDM unidirectional bidirectional adjustable wavelength technology, the forwarding networking can be realized more sensitively, a set of completed management system can be effectively established, the difficulties of transportation and management are solved, the management efficiency is improved, the 5G quick networking is facilitated, and the quick opening and convenient management can be achieved.

Disclosure of Invention

Aiming at the problems existing in the background technology and the prior art, the application is based on the DWDM unidirectional bidirectional adjustable wavelength technology, can realize more sensitive forwarding networking, effectively establish a set of completed management system, solve the difficulties of transportation and management, improve the management efficiency, be beneficial to 5G quick networking, and can achieve quick opening and convenient management.

According to a first aspect of some embodiments of the present application, there is provided a forwarding method, the forwarding method including performing, by using an active module as a management interface, collective connection of management cards, and simultaneous management of multiple connected devices; the active module comprises a CPU, the CPU manages an OTU service card through a connected exchange chip, and real-time monitoring and management are carried out through reading and configuring the optical module; the filter is built in the passive module, the upper wavelength and the lower wavelength of the single-port channel are paired, a COM port is connected with a circuit, a T-MON monitoring port is used for transmitting, and an H-MON monitoring port is used for receiving; the method comprises the steps of connecting OTU+NE equipment based on Ethernet through an NSM network management platform, communicating based on a network port, managing module information and reporting fault alarm information; and (5) carrying out local maintenance and troubleshooting on the fault point through an external display device.

In some embodiments, performing peer management based on an OAM channel, including performing OAM service processing, including configuration, query, and reporting, and entering an OAM link layer based on an OAM packet; performing OAM message processing, including adding frame header, scrambling code processing and verification, and entering a physical layer; after modulation by encoding, transmission is performed in the optical layer.

According to a second aspect of some embodiments of the present application, there is provided a forwarding system, the forwarding system including an active module as a management interface for aggregating management cards and simultaneously managing multiple devices; the active module comprises a CPU, wherein the CPU is used for managing an OTU service card through a connected exchange chip and is used for real-time monitoring and management through a reading and configuration optical module; the passive module comprises a built-in filter plate, a COM port, a T-MON monitoring port and an H-MON monitoring port, wherein the COM port is used for connecting a circuit, the T-MON monitoring port is used for transmitting, and the H-MON monitoring port is used for receiving; the NSM network management platform is connected with the OTU+NE equipment through the Ethernet, communicates through a network port and is used for managing module information and reporting fault alarm information; and the display device is used for local maintenance and fault point elimination.

In some embodiments, the OAM-based channel is used for peer management, and specifically includes a service configuration function, for supporting loopback testing and offline testing; the loop-back test configuration is used for loop-back, and whether the line is abnormal or not is confirmed through external streaming; the offline test confirms whether the opposite terminal module is offline or not based on the ACK information received by detection by sending an offline message; service restarting configuration, which is used for sending a restarting message of the opposite terminal, restarting the opposite terminal module and initializing a recovery function through restarting; the service layer inquiry function is used for sending an opposite end inquiry command and inquiring the related information, current, voltage, temperature, optical power, speed and transmission distance of an opposite end module; a service layer reporting function, configured to send a keep message, and confirm whether the message is abnormal, and if so, report an FCS error alarm; and the reporting alarm function on the service layer is that the reporting alarm is sent once at preset time intervals and is used for collecting LOS no-light signal alarms, and module voltage, current, temperature and power low alarms.

In some embodiments, the OAM channel includes an OAM service layer, an OAM physical layer, an OAM link layer, an optical layer; the OAM physical layer is located between the OAM link layer and the optical layer and is used for realizing physical layer processing of OAM data, including physical layer encoding and decoding and modulation and demodulation of the physical layer, and then entering the optical layer for transmission.

In some embodiments, the minimum crest depth of the modulation amplitude of the OAM physical layer is 3% and the maximum crest depth is 5%, so as to enable the module to normally receive OAM information.

In some embodiments, the OAM link layer is configured to implement an encapsulation and decapsulation function for an OAM frame and to implement frame synchronization.

In some embodiments, the encapsulation process includes the OAM link layer obtaining OAM payload content from the OAM service layer and encapsulating according to an OAM frame format.

In some embodiments, the OAM payload is further accurately parsed, and when the frame is retransmitted by a mechanism in case of abnormality, the frame is used to achieve information synchronization between the local end and the remote end, i.e., the remote end is managed by OAM.

In some embodiments, the functions of the NMS management platform specifically include an OAM configuration and query function, configured to query received optical power, transmitted optical power, voltage, temperature, module association information, configure loopback of an optical module, and configure restarting of a service layer; the query function of the far-end module is used for querying the association information, type, PN, SN and speed of the far-end optical module; the fault management function is used for inquiring the current alarm and the historical alarm, and the alarm information comprises generation time, type, level, reason and alarm state; the performance management function is used for supporting 15 minutes or 24 hours performance monitoring, supporting optical power and temperature out-of-limit alarming functions; and the topology management function is used for automatically discovering a remote module by adding the OTU+NE module, automatically creating topology connection, manually marking the longitude and latitude of each point position, and automatically matching the longitude and latitude to a GIS map for display.

Therefore, the forwarding method and the forwarding system of the application are based on the DWDM unidirectional bidirectional adjustable wavelength technology, can realize more sensitive forwarding networking, effectively establish a set of completed management system, solve the difficulties of transportation and management, improve the management efficiency, are beneficial to 5G quick networking, and can achieve quick opening and convenient management.

Drawings

For a better understanding and to set forth embodiments of the application, reference will now be made to the description of embodiments taken in conjunction with the accompanying drawings in which like reference numerals identify corresponding parts throughout.

Fig. 1 is an exemplary block diagram of a 4G bearer network architecture provided in accordance with the prior art.

Fig. 2 is an exemplary schematic diagram of a passive CWDM scheme provided in accordance with the prior art.

Fig. 3 is an exemplary schematic diagram of a forwarding system provided in accordance with a first embodiment of the present application.

Fig. 4 is an exemplary schematic diagram of an active module provided in accordance with an embodiment of the present application.

Fig. 5 is another exemplary schematic of an active module provided in accordance with an embodiment of the application.

Fig. 6 is an exemplary schematic diagram of a passive module provided in accordance with an embodiment of the application.

Fig. 7 is an exemplary schematic diagram of a display device according to a first embodiment of the present application.

Fig. 8 is an exemplary schematic diagram of an optical module topping state machine according to an embodiment of the present application.

English shorthand description:

OTU: optical Transform Unit light conversion unit

And NE: net Element, net Element

OAM: operation Administration and Maintenance, operation and maintenance management

NMS: network Management System network management system

LOS: loss Of Signal

PN: part Number, part model

SN: serial number, serial number

GIS: geographic Information Service geographic information service

Tunage: tunable keepalive: survival detection mechanism

FCS: frame check sequence frame check sequence

A MUX: multiplexer, multiplexer

DEMUX: demultiplexer, demultiplexer

DU: distributed Unit, distributed Unit

AAU: active Antenna Unit active antenna unit

DDM: digital Diagnostic Monitoring digital diagnostic monitoring

Detailed Description

The following description, with reference to the accompanying drawings, is provided to facilitate a comprehensive understanding of various embodiments of the application defined by the claims and their equivalents. These embodiments include various specific details for ease of understanding, but these are to be considered exemplary only. Accordingly, those skilled in the art will appreciate that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the application. In addition, descriptions of well-known functions and constructions will be omitted herein for brevity and clarity of description.

The terms and phrases used in the following specification and claims are not limited to a literal sense, but rather are only used for the purpose of clearly and consistently understanding the present application. Thus, it will be appreciated by those skilled in the art that the descriptions of the various embodiments of the present application are provided for illustration only and not for the purpose of limiting the application as defined by the appended claims and their equivalents.

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It is noted that the terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used in this disclosure refers to and encompasses any or all possible combinations of one or more of the associated listed items. The expressions "first", "second", "said first" and "said second" are used for modifying the respective elements irrespective of order or importance, and are used merely for distinguishing one element from another element without limiting the respective elements.

The embodiment of the application provides a forwarding method and a forwarding system. In order to facilitate understanding of the embodiments of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Fig. 3 is an exemplary schematic diagram of a forwarding system provided in accordance with a first embodiment of the present application. The forwarding system comprises an active module which is used as a management interface for carrying out set connection on the management card and simultaneously managing multiple devices; the active module comprises a CPU, wherein the CPU is used for managing an OTU service card through a connected exchange chip and is used for real-time monitoring and management through a reading and configuration optical module; the passive module comprises a built-in filter plate, a COM port, a T-MON monitoring port and an H-MON monitoring port, wherein the COM port is used for connecting a circuit, the T-MON monitoring port is used for transmitting, and the H-MON monitoring port is used for receiving; the NSM network management platform is connected with the OTU+NE equipment through the Ethernet, communicates through a network port and is used for managing module information and reporting fault alarm information; and the display device is used for local maintenance and fault point elimination.

The forwarding method is based on the forwarding system and comprises the steps of performing set connection on a management card through an active module serving as a management interface, and simultaneously managing a plurality of connected devices; the active module comprises a CPU, the CPU manages an OTU service card through a connected exchange chip, and real-time monitoring and management are carried out through reading and configuring the optical module; the filter is built in the passive module, the upper wavelength and the lower wavelength of the single-port channel are paired, a COM port is connected with a circuit, a T-MON monitoring port is used for transmitting, and an H-MON monitoring port is used for receiving; the method comprises the steps of connecting OTU+NE equipment based on Ethernet through an NSM network management platform, communicating based on a network port, managing module information and reporting fault alarm information; and (5) carrying out local maintenance and troubleshooting on the fault point through an external display device. In some embodiments, the forwarding method further performs peer management based on an OAM channel, specifically including performing OAM service processing including configuration, query, and reporting, and entering an OAM link layer based on an OAM packet; performing OAM message processing, including adding frame header, scrambling code processing and verification, and entering a physical layer; after modulation by encoding, transmission is performed in the optical layer.

According to some embodiments of the present application, the functions of the NMS management platform include an OAM configuration and query function, configured to query received optical power, transmitted optical power, voltage, temperature, module association information, and the like, and configure loopback of an optical module, and configure restarting of a service layer; the query function of the far-end module is used for querying the association information, type, PN, SN, speed and the like of the far-end optical module; the fault management function is used for inquiring the current alarm and the historical alarm, and the alarm information comprises generation time, type, level, reason, alarm state and the like; a performance management function for supporting 15 minutes or 24 hours performance monitoring, supporting optical power, a temperature out-of-limit alarm function, etc.; and the topology management function is used for automatically discovering a remote module by adding the OTU+NE module, automatically creating topology connection, manually marking the longitude and latitude of each point position, and automatically matching the longitude and latitude to a GIS map for display.

In some embodiments, the NMS network management platform may be a set of management platform of B/S architecture, based on browser/server mode, the server may be installed on server hardware, and the client may manage to the management platform including active and passive devices by accessing through the browser. As an example, the NMS network management platform may manage up to 10000 more devices including active and passive devices.

According to some embodiments of the present application, the forwarding system further includes an OAM-based channel for peer management, specifically including a service configuration function for supporting a loopback test and an offline test; the loop-back test configuration is used for loop-back, and whether the line is abnormal or not is confirmed through external streaming; the offline test confirms whether the opposite terminal module is offline or not based on the ACK information received by detection by sending an offline message; service restarting configuration, which is used for sending a restarting message of the opposite terminal, restarting the opposite terminal module and initializing a recovery function through restarting; a service layer inquiry function, configured to send an opposite end inquiry command to inquire about association information, current, voltage, temperature, optical power, speed, transmission distance, etc. of an opposite end module; a service layer reporting function, configured to send a keep message, and confirm whether the message is abnormal, and if so, report an FCS error alarm; and the reporting alarm function on the service layer is that the reporting alarm is sent once at preset time intervals and is used for collecting LOS no-light signal alarms, module voltage, current, temperature and power low alarms and the like.

In some embodiments, the OAM channel includes an OAM service layer, an OAM physical layer, an OAM link layer, an optical layer; the OAM physical layer is located between the OAM link layer and the optical layer and is used for realizing physical layer processing of OAM data, including physical layer encoding and decoding and modulation and demodulation of the physical layer, and then entering the optical layer for transmission. The minimum top modulation depth of the OAM physical layer modulation amplitude is 3%, and the maximum top modulation depth is 5%, so that the OAM physical layer modulation amplitude can normally receive OAM information. As an example, the OAM link layer is used to implement an OAM frame encapsulation and decapsulation function and to implement frame synchronization. The encapsulation process includes that the OAM link layer obtains OAM payload content from the OAM service layer and encapsulates according to an OAM frame format. Further, the OAM payload content is accurately analyzed, and frames are retransmitted through a mechanism when the OAM payload content is abnormal, so that information synchronization between the local end and the remote end is realized, namely the remote end is managed through the OAM.

Fig. 4 is an exemplary schematic diagram of an active module provided in accordance with an embodiment of the present application. Fig. 5 is another exemplary schematic of an active module provided in accordance with an embodiment of the application. According to some embodiments of the application, the active module portion requires power and the otu+ne portion requires external power while the optical module is mounted on the device. The active module is shown in fig. 4 and 5, 4 RJ45 network ports+2 SFP optical ports can be used as management interfaces, and the management card can be connected in a centralized manner to connect more devices for simultaneous management, so that the ports of the switch can be saved. In some embodiments, the CPU manages the OTU service card through the connected switching chip, and the main interface of the OTU service card includes 2xsfp, where 2xsfp supports installation of 2 pluggable optical modules, one is a client side and one is a line side, and service loopback of the port is implemented through internal crossover, so that the purpose of wavelength conversion can be achieved. Further, the CPU supports reading and configuring the optical module, so that the functions of real-time monitoring and management are achieved. As an example, when in application, the client side module is connected with the optical module of the DU, the line side module is connected with the MUX/DEMUX device, the connection mode is that the line side module is connected with the MUX/DEMUX as a single-fiber connection, and the Tunalbe SFP28 module is a single-fiber bidirectional module.

Fig. 6 is an exemplary schematic diagram of a passive module provided in accordance with an embodiment of the application. According to some embodiments of the application, the passive module part, without power supply, is installed on the AAU device by installing MUX/DEMUX B-Jie Boqi; the passive combination wave is internally provided with a red and blue band filter, the upper wavelength and the lower wavelength of a single-port channel are paired as shown in fig. 6, a COM port is used as a port of a connecting line, a T-MON/H-MON is respectively used as a transmitting monitoring port and a receiving monitoring port, and the spectral ratio is 1:99.

fig. 7 is an exemplary schematic diagram of a display device according to a first embodiment of the present application. According to some embodiments of the present application, the display device may be connected to the otu+ne device through an RJ45 network port, after connection, the service connection topology map may be clearly displayed, and the status information of the module may be displayed in real time, and the corresponding module and the line may be displayed in red when abnormal, so that the fault point may be rapidly queried through the display device. In some embodiments, the light modules and lines may be switched by way of a direction key, and more detailed information may be displayed for viewing by maintenance personnel by way of an "OK" key operation. As an example, the display device may be further connected to a USB keyboard and a mouse, and the apparatus may be operated and configured more quickly.

Fig. 8 is an exemplary schematic diagram of an optical module topping state machine according to an embodiment of the present application. According to some embodiments of the present application, the optical module topping state machine is shown in fig. 8, and the data transmission is performed in the "04h" state, wherein "08h" and "80h" are fault states, which indicate that the receiving end is abnormal and will not affect the transmitting end. In some embodiments, each frame includes local state information at the time of transmission.

According to some embodiments of the present application, the tsfp 28 is a tuneable 25G optical module, which may be a low-cost wide-range wavelength Tunable laser, and has an automatic port and wavelength adaptation function, so as to greatly simplify network construction and operation maintenance, reduce the types and numbers of spare parts, and reduce the networking cost.

In some embodiments, the tsfp 28 is a single-fiber bidirectional module, the light emitting wavelength and the light receiving wavelength can be modified by the interface, the preferred wavelength division of the application is C23-C34/C49-C60, i.e. the single-branch module is Tx/Rx corresponding to C23/C49, the opposite-end module is Tx/Rx corresponding to C39/C23, the service pair can be conveniently used according to the rule, and the light wavelength is used as a service (λas a service) and is connected and accessed from one port to the other.

According to some embodiments of the present application, the active office service card of the present application is an otu+ne part, which is a separate active device. The OTU service card can be provided with an optical module, and is different from the semi-active integrated detection and wave combining and splitting mode in the prior art. The optical module of the application is a DWDM optical module, and the wavelength is C23-C34/C49-C60, which is different from the CWDM module in the prior art.

The line side light module is a single-fiber bidirectional module, and the wavelengths can be used in pairs through automatic adaptation and adjustment, and the line side light module comprises a wavelength corresponding relation. The optical module in the prior art is arranged on a DU/AAU, and the color optical module is arranged on local side equipment. The composite wave (MUX/DEMUX) of the application is a DWDM device and is connected with an optical module as a single fiber, and the single fiber is bidirectional at the line side. The application does not use line protection, avoids the loss of the main link from being increased due to the line protection, and can reduce the use quantity of the optical cable.

The NMS network management platform of the application independently operates on a server and is connected with the network port of the OTU+NE. The design of the application is that 4 electric ports and 2 optical ports can be cascaded, and the number of ports is not described, so that the connection mode is described through communication through the network ports.

The OAM management of the application is a management channel between the Tuable 25G modules, management information can be transmitted on a service channel through the light amplitude modulation processing, and the functions of inquiring and managing the opposite end modules can be realized. The optical module of the application realizes the management function on the OTU single board, and is not realized by being installed on DU.

The NMS management platform can manage OTU+NE equipment through Ethernet, and can inquire the information of the active optical module corresponding to the remote passive device through OAM management.

According to some embodiments of the present application, the tsfp 28 of the present application is on the line side, the tsfp 28 is shown as short, T stands for tunelbe, and the SFP28 may refer to a package, and the present application refers to a 25G rate optical module.

In some embodiments, the tsfp 28 module is a single fiber bi-directional module that integrates BOSA: bi-directional Optical Sub-Assembly optical Bi-directional transceiver component device can realize transmission through one light.

In some embodiments, the DU device side and the client side of the OTU are normal gray light 25G optical modules (gray light is typically 1310nm wavelength) and the AAU device side is a Tunalbe SFP28 25G optical module.

It should be noted that the foregoing description of the forwarding system is merely for convenience of description and is not intended to limit the present application to the scope of the illustrated embodiments. It will be understood by those skilled in the art that various modifications and changes in form and detail of the functions of implementing the above-described apparatus and operations may be made to the individual structures in any combination or constituent sub-structures with other structures without departing from the principles of the present apparatus based on the principles. For example, the forwarding system may include OAM-based channels for peer management, etc. Such variations are within the scope of the application.

In summary, the forwarding method and system of the application based on DWDM unidirectional bidirectional adjustable wavelength technology can realize more sensitive forwarding networking, effectively establish a set of completed management system, solve the difficulties of transportation and management, improve the management efficiency, be favorable for 5G rapid networking, and achieve rapid opening and convenient management.

It should be noted that the above-described embodiments are merely examples, and the present application is not limited to such examples, but various changes may be made.

It should be noted that in this specification the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above disclosure is illustrative of only some of the preferred embodiments of the present application and should not be taken as limiting the scope of the application, as those skilled in the art will recognize that all or part of the structures described above may be implemented and equivalents thereof may be substituted for elements thereof which are shown in the claims below and still fall within the true scope of the present application.

Claims

1. A method of forwarding comprising:

the active module is used as a management interface to carry out set connection on management cards in the OTU+NE equipment so as to connect a plurality of OTU+NE equipment for simultaneous management; the active module comprises a CPU, the CPU manages an OTU service card through a connected exchange chip, and real-time monitoring and management are carried out through reading and configuring the optical module;

the filter is built in the passive module, the upper wavelength and the lower wavelength of the single-port channel are paired, a COM port is connected with a circuit, a T-MON monitoring port is used for transmitting, and an H-MON monitoring port is used for receiving;

the network management platform is connected with the OTU+NE equipment based on the Ethernet through the NMS, and the communication is carried out based on the network port, so that the module information is managed and the fault alarm information is reported;

local maintenance and troubleshooting of fault points are carried out through an external display device;

the OTU service card is positioned at the network element side, an interface on the OTU service card comprises 2 SFP optical ports, one of the 2 SFP optical ports is used for installing a pluggable optical module at the client side, the pluggable optical module at the client side is a common double-fiber optical module and is used for being connected with the common double-fiber optical module at the DU equipment side, the other pluggable optical module at the line side is used for being installed, and the pluggable optical module at the line side is a single-fiber bidirectional optical module; the single-fiber bidirectional optical module at the line side is connected with a single fiber of the MUX/DEMUX A wave combining and splitting device; the wavelengths of the single-fiber bidirectional optical modules can be adjusted through automatic adaptation and used in pairs, and the wavelength corresponding relation is included;

the AAU equipment side is provided with a single-fiber bidirectional optical module, the passive module comprises a MUX/DEMUX B combined wave-splitting device, and the MUX/DEMUX B combined wave-splitting device is internally provided with the filter; the single-fiber bidirectional optical module at the AAU equipment side is connected with the MUX/DEMUX B wave combining and splitting device single fiber;

the MUX/DEMUX A wave combining and separating device is connected with the MUX/DEMUX B wave combining and separating device through single fibers; the MUX/DEMUX A wave combining and separating device and the MUX/DEMUX B wave combining and separating device are DWDM devices;

wherein, the NMS network management platform manages the active module and the passive module through the Ethernet;

the otu+ne device is a network element device integrating the management card and the OTU service card.

2. The method according to claim 1, wherein the line-side single-fiber bidirectional optical module performs peer management based on an OAM channel, specifically comprising:

performing OAM service processing, including configuration, inquiry and reporting, and entering an OAM link layer based on an OAM message;

performing OAM message processing, including adding frame header, scrambling code processing and verification, and entering a physical layer;

after modulation by encoding, transmission is performed in the optical layer.

3. A forward-drive system, comprising:

the active module is used as a management interface for carrying out set connection on management cards in the OTU+NE equipment so as to connect a plurality of OTU+NE equipment for simultaneous management; the active module comprises a CPU, the CPU manages an OTU service card through a connected exchange chip, and monitors and manages in real time through reading and configuring an optical module;

the passive module comprises a built-in filter plate, a COM port, a T-MON monitoring port and an H-MON monitoring port, wherein the COM port is used for connecting a circuit, the T-MON monitoring port is used for transmitting, and the H-MON monitoring port is used for receiving;

the NMS network management platform is connected with the OTU+NE equipment through the Ethernet, communicates through a network port and is used for managing module information and reporting fault alarm information;

the display device is used for local maintenance and fault point elimination;

4. A system according to claim 3, wherein the single-fiber bidirectional optical module on the line side is based on an OAM channel for peer management, and specifically comprises:

the service configuration function is used for supporting loopback test and offline test; the loop-back test configuration is used for loop-back, and whether the line is abnormal or not is confirmed through external streaming; the offline test confirms whether the opposite terminal module is offline or not based on the ACK information received by detection by sending an offline message;

service restarting configuration, which is used for sending a restarting message of the opposite terminal, restarting the opposite terminal module and initializing a recovery function through restarting;

the service layer inquiry function is used for sending an opposite end inquiry command and inquiring the related information, current, voltage, temperature, optical power, speed and transmission distance of an opposite end module;

a service layer reporting function, configured to send a keep message, and confirm whether the message is abnormal, and if so, report an FCS error alarm;

and the reporting alarm function on the service layer is that the reporting alarm is sent once at preset time intervals and is used for collecting LOS no-light signal alarms, and module voltage, current, temperature and power low alarms.

5. The system of claim 4, wherein the OAM channel comprises an OAM service layer, an OAM physical layer, an OAM link layer, an optical layer; the OAM physical layer is located between the OAM link layer and the optical layer and is used for realizing physical layer processing of OAM data, including physical layer encoding and decoding and modulation and demodulation of the physical layer, and then entering the optical layer for transmission.

6. The system of claim 5, wherein the OAM physical layer modulation amplitude has a minimum tone top depth of 3% and a maximum tone top depth of 5% for enabling the module to normally receive OAM information.

7. The system of claim 5, wherein the OAM link layer is configured to perform OAM frame encapsulation and decapsulation functions and to perform frame synchronization.

8. The system of claim 7, wherein the encapsulation process comprises the OAM link layer obtaining OAM payload content from the OAM service layer and encapsulating according to an OAM frame format.

9. The system of claim 8, wherein the OAM payload is further accurately parsed, and frames are retransmitted by a mechanism when abnormal, for implementing synchronization of information between the local and remote ends, i.e., managing the remote ends by OAM.

10. The system of claim 4, wherein the functions of the NMS network management platform specifically include:

the OAM configuration and query function is used for querying received optical power, transmitted optical power, voltage, temperature and module association information, configuring the loop back of the optical module and configuring the restarting of the service layer;

the query function of the far-end module is used for querying the association information, type, PN, SN and speed of the far-end optical module;

the fault management function is used for inquiring the current alarm and the historical alarm, and the alarm information comprises generation time, type, level, reason and alarm state;

the performance management function is used for supporting 15 minutes or 24 hours performance monitoring, supporting optical power and temperature out-of-limit alarming functions;

and the topology management function is used for automatically discovering a remote module by adding the OTU+NE module, automatically creating topology connection, manually marking the longitude and latitude of each point position, and automatically matching the longitude and latitude to a GIS map for display.