CN113115137A - DCC overhead transparent transmission method and device - Google Patents
DCC overhead transparent transmission method and device Download PDFInfo
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- CN113115137A CN113115137A CN202110302270.8A CN202110302270A CN113115137A CN 113115137 A CN113115137 A CN 113115137A CN 202110302270 A CN202110302270 A CN 202110302270A CN 113115137 A CN113115137 A CN 113115137A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1652—Optical Transport Network [OTN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0086—Network resource allocation, dimensioning or optimisation
Abstract
The invention provides a method and a device for transparently transmitting DCC overhead. The method comprises the following steps: the STM processing unit extracts DCC overhead and load of a data communication channel from an STM-N frame, adds a frame header containing source and sink slot position information and source and sink slot time information for the load, obtains a load packet and sends the load packet to the switching unit, and sends the DCC overhead to the DCC processing unit; the DCC processing unit adds source and sink slot position information and source and sink slot position information for DCC overhead to obtain DCC frames and sends the DCC frames to the switching unit; the switching unit sends the DCC frame and the load packet to the POTN processing unit; the POTN processing unit extracts DCC overhead and source-destination time slot information from the DCC frame, searches a target load packet according to the source-destination time slot information, adds a pointer and the DCC overhead to the load of the target load packet, obtains an STM-N frame, maps the STM-N frame to an ODUk to form an OTUk frame, and sends the OTUk frame to an opposite terminal device. Through the embodiment, the DCC overhead of the SDH service is transparently transmitted on the POTN equipment.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method and a device for transparently transmitting DCC overhead.
Background
The conventional transmission network types are as follows: PTN (Packet Transport Network), OTN (Optical Transport Network), MSTP (Multi-Service Transport Platform, SDH (Synchronous Digital Hierarchy) -based Multi-Service Transport Platform). With the continuous evolution and convergence of transmission networks, POTN application is coming. The POTN is a new generation of transmission equipment, integrates the network functions of optical layer (WDM), OTN and SDH layer and packet transport layer (MPLS-TP, ETH), has the switching and scheduling capability to TDM (ODUk), packet (MPLS-TP, ETH) and VC, and realizes the uniform and flexible transmission function to various services such as packet, OTN, SDH and the like.
In practical engineering application, transparent transmission can be realized when the SDH service is used as a service requirement for access of POTN equipment, especially when the SDH service requires source and destination communication, and data communication channel DCC 1-12 bytes are adopted for communication. When the SDH is accessed to the conventional OTN device, the SDH is directly mapped to the ODUk, overhead termination is not performed on the SDH service, and a DCC management overhead byte can be transparently transmitted, but in the POTN device based on VC/ODUk/Packet switching, switching particles between the service board card and the line board card are VC particles, and DCC management overhead of a data communication path is already terminated when switching is performed, so that the DCC management overhead cannot be transparently transmitted.
Disclosure of Invention
The invention mainly aims to provide a method and a device for transparently transmitting DCC overhead, and aims to solve the technical problem that the POTN equipment in the prior art cannot realize DCC overhead transparent transmission based on VC exchange.
In a first aspect, the present invention provides a method for transparently transmitting DCC overheads, where the method for transparently transmitting DCC overheads includes:
the STM processing unit extracts DCC overhead and load of a data communication channel from an STM-N frame, adds a frame header containing source and sink slot position information and source and sink slot position information for the load to obtain a load packet, sends the load packet to the switching unit, and sends the DCC overhead to the DCC processing unit;
the DCC processing unit adds source and sink slot position information and source and sink slot position information for the DCC overhead to obtain a DCC frame, and sends the DCC frame to the switching unit;
the switching unit sends the DCC frame and the load packet to a POTN processing unit;
the POTN processing unit extracts DCC overhead and source-destination time slot information from a received DCC frame, searches a target load packet from the received load packet according to the source-destination time slot information, adds a pointer and the DCC overhead to the load of the target load packet to obtain an STM-N frame, and maps the STM-N frame to an optical path data unit ODUk to form an OTUk frame which is sent to an opposite terminal device.
Optionally, the method for transparently transmitting the DCC overhead further includes:
the POTN processing unit analyzes an STM-N frame from an OTUk frame, extracts DCC overhead and load from the STM-N frame, and sends the DCC overhead and load to the switching unit;
the switching unit sending the payload to the STM processing unit and the DCC overhead to the DCC processing unit;
the DCC processing unit sending the DCC overhead to the STM processing unit;
and the STM processing unit adds a pointer and the DCC overhead to the load to obtain an STM-N frame, and sends the STM-N frame to SDH equipment.
Optionally, the method for transparently transmitting the DCC overhead further includes:
and configuring source and sink slot position information and source and sink time slot information through a control unit, and sending the source and sink slot position information and the source and sink time slot information to an STM processing unit, a DCC processing unit and a POTN processing unit.
Optionally, the step of sending, by the switching unit, the DCC frame and the payload packet to the POTN processing unit includes:
and the switching unit sends the DCC frame to a POTN processing unit corresponding to the sink position information in the DCC frame, and sends the load packet to the POTN processing unit corresponding to the sink position information in the load packet.
Optionally, the step of mapping the STM-N frame to an optical channel data unit ODUk to form an OTUk frame, and sending the OTUk frame to an opposite device includes:
and mapping the STM-N frame into an optical channel data unit ODUk, adding OTU overhead, FEC coding and an OTN frame header to the ODUk frame obtained by mapping to form an OTUk frame, and sending the OTUk frame to opposite-end equipment.
In a second aspect, the present invention further provides an apparatus for transparently transmitting DCC overhead, where the apparatus for transparently transmitting DCC overhead includes:
the STM processing unit is used for extracting DCC (data communication channel) overhead and load from an STM-N frame, adding a frame header containing source and sink slot position information and source and sink slot time information to the load to obtain a load packet, sending the load packet to the switching unit, and sending the DCC overhead to the DCC processing unit;
a DCC processing unit, configured to add source-sink slot location information and source-sink slot location information for the DCC overhead to obtain a DCC frame, and send the DCC frame to the switching unit;
the switching unit is used for sending the DCC frame and the load packet to the POTN processing unit;
the POTN processing unit is used for extracting DCC overhead and source-destination time slot information from a received DCC frame, searching a target load packet from the received load packet according to the source-destination time slot information, adding a pointer and the DCC overhead to the load of the target load packet to obtain an STM-N frame, and mapping the STM-N frame to an optical path data unit ODUk to form an OTUk frame to be sent to an opposite terminal device.
Optionally:
the POTN processing unit is also used for analyzing an STM-N frame from the OTUk frame, extracting DCC overhead and load from the STM-N frame, and sending the DCC overhead and the load to the switching unit;
a switching unit further configured to send the payload to the STM processing unit and send the DCC overhead to the DCC processing unit;
a DCC processing unit further to send the DCC overhead to the STM processing unit;
and the STM processing unit is also used for adding a pointer and the DCC overhead to the load to obtain an STM-N frame and sending the STM-N frame to the SDH equipment.
Optionally, the apparatus for transparently transmitting DCC overhead further includes:
and the control unit is used for configuring the source and sink slot position information and the source and sink time slot information and sending the source and sink slot position information and the source and sink time slot information to the STM processing unit, the DCC processing unit and the POTN processing unit.
Optionally, the switching unit is configured to:
and sending the DCC frame to a POTN processing unit corresponding to the sink position information in the DCC frame, and sending the load packet to the POTN processing unit corresponding to the sink position information in the load packet.
Optionally, the POTN processing unit is configured to:
and mapping the STM-N frame into an optical channel data unit ODUk, adding OTU overhead, FEC coding and an OTN frame header to the ODUk frame obtained by mapping to form an OTUk frame, and sending the OTUk frame to opposite-end equipment.
In the invention, an STM processing unit extracts DCC overhead and load of a data communication channel from an STM-N frame, adds a frame header containing source and sink slot position information and source and sink slot time information for the load to obtain a load packet, sends the load packet to a switching unit, and sends the DCC overhead to a DCC processing unit; the DCC processing unit adds source and sink slot position information and source and sink slot position information for the DCC overhead to obtain a DCC frame, and sends the DCC frame to the switching unit; the switching unit sends the DCC frame and the load packet to a POTN processing unit; the POTN processing unit extracts DCC overhead and source-destination time slot information from a received DCC frame, searches a target load packet from the received load packet according to the source-destination time slot information, adds a pointer and the DCC overhead to the load of the target load packet to obtain an STM-N frame, and maps the STM-N frame to an optical path data unit ODUk to form an OTUk frame which is sent to an opposite terminal device. The invention realizes the transparent transmission of DCC overhead of SDH service on POTN equipment.
Drawings
Fig. 1 is a schematic flow chart illustrating an embodiment of a method for transparently transmitting DCC overhead according to the present invention;
FIG. 2 is a detailed schematic diagram of an STM processing unit;
figure 3 is a detailed schematic diagram of a DCC processing unit;
FIG. 4 is a detailed schematic diagram of the switching unit;
FIG. 5 is a detailed schematic diagram of a POTN processing unit;
FIG. 6 is a detailed schematic diagram of the control unit;
figure 7 is a schematic diagram illustrating a scenario of an embodiment of a method for transparently transferring DCC overhead in accordance with the present invention;
figure 8 is a functional block diagram of an embodiment of an apparatus for transparently passing DCC overhead in accordance with the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In a first aspect, an embodiment of the present invention provides a method for transparently transmitting DCC overhead.
Referring to fig. 1, fig. 1 is a flowchart illustrating an embodiment of a method for transparently transmitting DCC overhead according to the present invention. As shown in fig. 1, in an embodiment, a method for transparently transmitting DCC overhead includes:
step S10, the STM processing unit extracts DCC overhead and load of the data communication channel from the STM-N frame, adds a frame header containing source and sink slot position information and source and sink slot position information for the load to obtain a load packet, sends the load packet to the switching unit, and sends the DCC overhead to the DCC processing unit;
in this embodiment, the SDH service realizes support of the POTN device for the SDH service by the STM processing unit, and can support the SDH services such as STM-1/4/16/64. The STM processing unit extracts DCC overhead of a data communication channel and a load from an STM-N frame, wherein the load is a VC-4 frame. And adding a frame header containing the source and sink slot position information and the source and sink time slot information before the load to obtain a load packet, namely adding the frame header containing the source and sink slot position information and the source and sink time slot information before the VC-4 frame, and performing packetization to obtain packetized VC-4. The payload packet (i.e., packetized VC-4) is sent to the switch unit. The DCC overhead is sent to the DCC processing unit. The DCC is an abbreviation of a datacommunication channel, that is, a data communication channel, DCC overhead data includes overhead bytes D1 to D12 and overhead bytes E1 and E2, the overhead bytes D1 to D12 transmit network management information, the overhead bytes E1 and E2 transmit service information, and the DCC overhead in this embodiment is overhead bytes D1 to D12.
Referring to fig. 2, fig. 2 is a detailed schematic diagram of an STM processing unit. As shown in fig. 2, the STM processing unit includes:
the STM service processing 101 is used for STM service access, can access STM-1/4/16/64 and other services, and can monitor the overhead information of the regeneration section and the multiplexing section.
The DCC extraction insertion unit 102 extracts information of corresponding data communication path DCC overhead (D1-D12) from the STM service processing 101 according to source-sink slot positions, source-sink slot information, etc. configured by the control unit, and stores the information in a corresponding register.
The VC processing unit 103 strips overhead from the STM service processing 101, decodes the VC-4 frame, and sends the frame to the VC switching unit 104.
in this embodiment, the DCC processing unit may receive one or more DCC overheads, and the DCC processing unit adds source/sink slot position information and source/sink slot time information to each received DCC overhead to obtain a DCC frame corresponding to each DCC overhead, and sends the DCC frame to the switching unit.
Referring to fig. 3, fig. 3 is a detailed diagram of the DCC processing unit. As shown in fig. 3, the DCC processing unit includes:
DCC receiving/transmitting section 201 is connected to DCC extracting and inserting section 102 and receives information of data communication paths DCC (D1-D12).
DCC framing processing section 202 adds DCC information of each data communication path to the source and sink slot position and the source and sink slot information to be a DCC frame based on the slot position and slot information provided by the control section from DCC receiving/transmitting section 201 to DCC information (D1-D12), and transmits the DCC frame to DCC transmitting section 203.
And the DCC transfer unit 203 transmits the DCC frame to the switching unit, and the DCC transfer unit 203 and the switching unit are connected in an electrical interface manner for transferring the DCC frame.
The whole DCC processing unit can realize 64 slot positions of the whole system, and each slot position has 20 DCC information processing paths.
Step S30, the switch unit sends the DCC frame and the payload packet to a POTN processing unit;
in this embodiment, the switch unit sends the received DCC frame and the payload packet to the POTN processing unit.
Further, in one embodiment, step S30 includes:
and the switching unit sends the DCC frame to a POTN processing unit corresponding to the sink position information in the DCC frame, and sends the load packet to the POTN processing unit corresponding to the sink position information in the load packet.
In this embodiment, the source slot information is slot information of an STM processing unit, the sink slot information is slot information of a POTN processing unit, the VC service crosses a corresponding slot of the POTN processing unit, and a DCC frame/payload packet is a corresponding slot of the POTN processing unit to be sent. Based on the DCC frame, the switching unit sends the DCC frame to the POTN processing unit corresponding to the sink slot position information in the DCC frame; and similarly, sending the load packet to the POTN processing unit corresponding to the sink position information in the load packet.
Referring to fig. 4, fig. 4 is a detailed schematic diagram of the switching unit. As shown in fig. 4, the switching unit includes:
the transmitting unit 301 receives the DCC frame from the DCC transmitting unit 203, and transmits the DCC frame to the POTN processing unit of the corresponding slot according to the source-sink slot position information of the DCC frame.
Service switching unit 302 completes the switching of VC4/ODUK/Packet service, and this application mainly explains DCC delivery related to SDH service, so the processing of ODUK/Packet service is not described in detail again. And receiving the packetized VC-4 from the VC switching unit 104, and sending the packetized VC-4 to the POTN processing unit of the corresponding slot position according to the source and destination slot position information in the packetized VC-4.
Step S40, the POTN processing unit extracts DCC overhead and source/sink time slot information from the received DCC frame, searches for a target load packet from the received load packet according to the source/sink time slot information, adds a pointer and the DCC overhead to a load of the target load packet to obtain an STM-N frame, and maps the STM-N frame to an optical channel data unit ODUk to form an OTUk frame, which is sent to an opposite end device.
In this embodiment, the POTN processing unit extracts DCC overhead and source-sink time slot information from a received DCC frame, finds a target load packet of a corresponding time slot from the received load packet according to the source-sink time slot information, adds a pointer and the DCC overhead to a load of the target load packet to obtain an STM-N frame, and then maps the STM-N frame to an optical channel data unit ODUk to form an OTUk frame, which is sent to an opposite-end device.
Further, in an embodiment, the step of mapping the STM-N frame to an optical channel data unit ODUk to form an OTUk frame, and sending the OTUk frame to an opposite device includes:
and mapping the STM-N frame into an optical channel data unit ODUk, adding OTU overhead, FEC coding and an OTN frame header to the ODUk frame obtained by mapping to form an OTUk frame, and sending the OTUk frame to opposite-end equipment.
In this embodiment, the POTN processing unit maps the STM-N frame to an optical channel data unit ODUk, adds OTU overhead, FEC coding, and an OTN frame header to the ODUk frame obtained by mapping to form an OTUk frame, and then sends the OTUk frame to an opposite-end device.
Referring to fig. 5, fig. 5 is a detailed schematic diagram of the POTN processing unit. As shown in fig. 5, the POTN processing unit includes:
The DCC insertion extraction unit 402 places DCC (D1-D12) overhead information of the data communication path into corresponding registers according to source and sink slot information provided by the control unit. The unit is connected with the STM-N framing unit 405 using an overhead interface.
The service switching unit 403 receives the packetized VC-4 transmitted from the switching unit and sends the packetized VC-4 to the VC processing unit 404.
The VC processing unit 404 receives the packetized VC-4 from the service switching unit, strips the source and sink slot position information, and decodes the VC-4 frame.
And the STM-N framing unit 405 acquires DCC (D1-D12) overhead information of a data communication channel from the DCC insertion and extraction unit according to the source sink time slot information, and adds a pointer to the VC-4 frame to increase the DCC (D1-D12) overhead information to form an STM-N frame.
The ODUK mapping unit 406 maps the STM-N service to the ODUK, where different STM-N services use different ODUKs.
The OTN framing unit 407 adds the received ODUK to the OTU overhead, FEC, and OTN frame header to form an OTUk frame, and then sends the OTUk frame.
In this embodiment, the STM processing unit extracts DCC overhead and a load of a data communication channel from an STM-N frame, adds a frame header including source and sink slot position information and source and sink slot time information to the load to obtain a load packet, sends the load packet to the switching unit, and sends the DCC overhead to the DCC processing unit; the DCC processing unit adds source and sink slot position information and source and sink slot position information for the DCC overhead to obtain a DCC frame, and sends the DCC frame to the switching unit; the switching unit sends the DCC frame and the load packet to a POTN processing unit; the POTN processing unit extracts DCC overhead and source-destination time slot information from a received DCC frame, searches a target load packet from the received load packet according to the source-destination time slot information, adds a pointer and the DCC overhead to the load of the target load packet to obtain an STM-N frame, and maps the STM-N frame to an optical path data unit ODUk to form an OTUk frame which is sent to an opposite terminal device. Through the embodiment, the DCC overhead of the SDH service is transparently transmitted on the POTN equipment.
Further, in an embodiment, the method for transparently transmitting the DCC overhead further includes:
and configuring source and sink slot position information and source and sink time slot information through a control unit, and sending the source and sink slot position information and the source and sink time slot information to an STM processing unit, a DCC processing unit and a POTN processing unit.
In this embodiment, the source and sink slot position information and the source and sink time slot information may be configured in advance through the control unit, and the source and sink slot position information and the source and sink time slot information are issued to the STM processing unit, the DCC processing unit, and the POTN processing unit.
Referring to fig. 6, fig. 6 is a detailed schematic diagram of the control unit. As shown in fig. 6, the control unit includes:
the DCC configuration unit 501 configures DCC of each port in the STM processing unit to transparent transmission or termination according to an application scenario of the project.
The source/sink selection unit 502 configures a source/sink slot position, a source/sink time slot, etc. of the VC according to user requirements, and sends these information to the STM processing unit, the POTN processing unit, and the DCC processing unit.
Further, in an embodiment, the method for transparently transmitting the DCC overhead further includes:
the POTN processing unit analyzes an STM-N frame from an OTUk frame, extracts DCC overhead and load from the STM-N frame, and sends the DCC overhead and load to the switching unit; the switching unit sending the payload to the STM processing unit and the DCC overhead to the DCC processing unit; the DCC processing unit sending the DCC overhead to the STM processing unit; and the STM processing unit adds a pointer and the DCC overhead to the load to obtain an STM-N frame, and sends the STM-N frame to SDH equipment.
In this embodiment, the POTN processing unit parses an STM-N frame from the OTUk frame, further extracts DCC overhead and a payload from the STM-N frame, and sends the DCC overhead and the payload to the switching unit. The switching unit transmits the received payload to the STM processing unit and transmits the received DCC overhead to the DCC processing unit. The DCC processing unit further transmits the received DCC overhead to the STM processing unit. And the STM processing unit adds a pointer and DCC overhead to the received load to obtain an STM-N frame, and sends the STM-N frame to the SDH equipment, so that the DCC overhead of the SDH service is transparently transmitted on the POTN equipment.
Referring to fig. 7, fig. 7 is a schematic view illustrating a scenario of an embodiment of a method for transparently transmitting DCC overhead according to the present invention. The devices 1/2 each include: STM processing unit, Ethernet processing unit, other service processing unit, switching unit, POTN processing unit, DCC processing unit, control unit. The STM processing unit, the Ethernet processing unit, other service processing units, the switching unit and the POTN processing unit are combined to complete cross scheduling and transmission of services. The DCC processing unit mainly completes the processing of DCC management overhead. The control unit mainly completes the related configuration of service, DCC and the like. If the transmission direction of DCC overhead is from left to right, firstly, an STM-N frame is accessed through an STM processing unit of the equipment 1, the STM processing unit of the equipment 1 peels off the DCC overhead of the STM-N frame, and the DCC is sent to the DCC processing unit of the equipment 1; the VC service is resolved from the load of the STM-N frame and sent to the switching unit of the device 1 after packetization. The DCC processing unit of device 1 performs a termination or extraction process according to the configuration of the control unit. The DCC processing unit of the device 1 receives all DCC overheads that need to be transparently transmitted in the entire device, adds a source-sink slot position and source-sink slot time information to each DCC overhead according to the slot position and slot time information provided by the control unit to obtain a DCC frame, and transmits the DCC frame to the switching unit of the device 1 through the DCC transmission unit. The switching unit of the device 1 sends the DCC frames of traffic to the corresponding POTN processing unit according to the configuration of the control unit. The POTN processing unit receives the target load packet from the switching unit, extracts DCC information and time slot information from the received DCC frame, adds DCC overhead on the VC load to form an STM-N frame, maps the STM-N frame to an ODUK frame to form an OTUK frame, and transmits the OTUK frame to the device 2, and performs a reverse process with respect to the device 1 on the device 2. Similarly, if the transmission direction of the DCC overhead is from right to left, the process performed by the device 1 may be performed on the device 2, and the process performed by the device 1 may be performed in the reverse direction to that performed by the device 2.
In a second aspect, an embodiment of the present invention further provides an apparatus for transparently transmitting DCC overhead.
Referring to fig. 8, fig. 8 is a functional block diagram of an embodiment of an apparatus for transparently transmitting DCC overhead according to the present invention. As shown in fig. 8, the apparatus for transparently transmitting DCC overhead includes:
an STM processing unit 10, configured to extract DCC overhead and a load of a data communication channel from an STM-N frame, add a frame header including source and sink slot position information and source and sink slot time information to the load to obtain a load packet, send the load packet to a switching unit, and send the DCC overhead to a DCC processing unit;
a DCC processing unit 20, configured to add source and sink slot position information and source and sink slot information to the DCC overhead to obtain a DCC frame, and send the DCC frame to the switching unit;
a switching unit 30, configured to send the DCC frame and the payload packet to a POTN processing unit;
the POTN processing unit 40 is configured to extract DCC overhead and source-sink time slot information from a received DCC frame, search a target load packet from the received load packet according to the source-sink time slot information, add a pointer and the DCC overhead to a load of the target load packet to obtain an STM-N frame, map the STM-N frame to an optical channel data unit ODUk to form an OTUk frame, and send the OTUk frame to an opposite-end device.
Further, in one embodiment:
the POTN processing unit 40 is further configured to parse an STM-N frame from an OTUk frame, extract DCC overheads and loads from the STM-N frame, and send the DCC overheads and loads to the switching unit;
a switching unit 30, further configured to send the payload to the STM processing unit and send the DCC overhead to the DCC processing unit;
the STM processing unit 10 is further configured to add a pointer and the DCC overhead to the payload to obtain an STM-N frame, and send the STM-N frame to the SDH device.
Further, in an embodiment, the apparatus for transparently transmitting DCC overhead further includes:
and the control unit 50 is configured to configure source and sink slot position information and source and sink slot time information, and send the source and sink slot position information and the source and sink slot time information to the STM processing unit, the DCC processing unit, and the POTN processing unit.
Further, in an embodiment, the switching unit 30 is configured to:
and sending the DCC frame to a POTN processing unit corresponding to the sink position information in the DCC frame, and sending the load packet to the POTN processing unit corresponding to the sink position information in the load packet.
Further, in an embodiment, the POTN processing unit 40 is configured to:
and mapping the STM-N frame into an optical channel data unit ODUk, adding OTU overhead, FEC coding and an OTN frame header to the ODUk frame obtained by mapping to form an OTUk frame, and sending the OTUk frame to opposite-end equipment.
The function implementation of each module in the apparatus for transparently transmitting DCC overhead corresponds to each step in the embodiment of the method for transparently transmitting DCC overhead, and the function and implementation process thereof are not described in detail herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system 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 system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for causing a terminal device to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for transparently transmitting DCC overhead is characterized by comprising the following steps:
the STM processing unit extracts DCC overhead and load of a data communication channel from an STM-N frame, adds a frame header containing source and sink slot position information and source and sink slot position information for the load to obtain a load packet, sends the load packet to the switching unit, and sends the DCC overhead to the DCC processing unit;
the DCC processing unit adds source and sink slot position information and source and sink slot position information for the DCC overhead to obtain a DCC frame, and sends the DCC frame to the switching unit;
the switching unit sends the DCC frame and the load packet to a POTN processing unit;
the POTN processing unit extracts DCC overhead and source-destination time slot information from a received DCC frame, searches a target load packet from the received load packet according to the source-destination time slot information, adds a pointer and the DCC overhead to the load of the target load packet to obtain an STM-N frame, and maps the STM-N frame to an optical path data unit ODUk to form an OTUk frame which is sent to an opposite terminal device.
2. The method of transparently transmitting DCC overhead of claim 1, further comprising:
the POTN processing unit analyzes an STM-N frame from an OTUk frame, extracts DCC overhead and load from the STM-N frame, and sends the DCC overhead and load to the switching unit;
the switching unit sending the payload to the STM processing unit and the DCC overhead to the DCC processing unit;
the DCC processing unit sending the DCC overhead to the STM processing unit;
and the STM processing unit adds a pointer and the DCC overhead to the load to obtain an STM-N frame, and sends the STM-N frame to SDH equipment.
3. The method of transparently transmitting DCC overhead of claim 1, wherein the method of transparently transmitting DCC overhead further comprises:
and configuring source and sink slot position information and source and sink time slot information through a control unit, and sending the source and sink slot position information and the source and sink time slot information to an STM processing unit, a DCC processing unit and a POTN processing unit.
4. The method of transparently transmitting DCC overhead according to claim 1, wherein the step of the switching unit transmitting the DCC frame and the payload packet to the POTN processing unit comprises:
and the switching unit sends the DCC frame to a POTN processing unit corresponding to the sink position information in the DCC frame, and sends the load packet to the POTN processing unit corresponding to the sink position information in the load packet.
5. The method for transparently transmitting DCC overhead according to claim 1, wherein the step of mapping the STM-N frame to an optical channel data unit ODUk to form an OTUk frame and transmitting the OTUk frame to an opposite end device comprises:
and mapping the STM-N frame into an optical channel data unit ODUk, adding OTU overhead, FEC coding and an OTN frame header to the ODUk frame obtained by mapping to form an OTUk frame, and sending the OTUk frame to opposite-end equipment.
6. An apparatus for transparently transferring DCC overhead, the apparatus comprising:
the STM processing unit is used for extracting DCC (data communication channel) overhead and load from an STM-N frame, adding a frame header containing source and sink slot position information and source and sink slot time information to the load to obtain a load packet, sending the load packet to the switching unit, and sending the DCC overhead to the DCC processing unit;
a DCC processing unit, configured to add source-sink slot location information and source-sink slot location information for the DCC overhead to obtain a DCC frame, and send the DCC frame to the switching unit;
the switching unit is used for sending the DCC frame and the load packet to the POTN processing unit;
the POTN processing unit is used for extracting DCC overhead and source-destination time slot information from a received DCC frame, searching a target load packet from the received load packet according to the source-destination time slot information, adding a pointer and the DCC overhead to the load of the target load packet to obtain an STM-N frame, and mapping the STM-N frame to an optical path data unit ODUk to form an OTUk frame to be sent to an opposite terminal device.
7. The apparatus for transparently transmitting DCC overhead of claim 6, wherein:
the POTN processing unit is also used for analyzing an STM-N frame from the OTUk frame, extracting DCC overhead and load from the STM-N frame, and sending the DCC overhead and the load to the switching unit;
a switching unit further configured to send the payload to the STM processing unit and send the DCC overhead to the DCC processing unit;
a DCC processing unit further to send the DCC overhead to the STM processing unit;
and the STM processing unit is also used for adding a pointer and the DCC overhead to the load to obtain an STM-N frame and sending the STM-N frame to the SDH equipment.
8. The apparatus for transparently transmitting DCC overhead of claim 6, wherein the apparatus for transparently transmitting DCC overhead further comprises:
and the control unit is used for configuring the source and sink slot position information and the source and sink time slot information and sending the source and sink slot position information and the source and sink time slot information to the STM processing unit, the DCC processing unit and the POTN processing unit.
9. The apparatus for transparently transmitting DCC overhead of claim 6, wherein the switching element is configured to:
and sending the DCC frame to a POTN processing unit corresponding to the sink position information in the DCC frame, and sending the load packet to the POTN processing unit corresponding to the sink position information in the load packet.
10. The apparatus for transparently transmitting DCC overhead according to claim 6, wherein the POTN processing unit is configured to:
and mapping the STM-N frame into an optical channel data unit ODUk, adding OTU overhead, FEC coding and an OTN frame header to the ODUk frame obtained by mapping to form an OTUk frame, and sending the OTUk frame to opposite-end equipment.
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