CN110649987A - Optical transmission system apparatus, conversion unit, conversion method, and storage medium - Google Patents

Optical transmission system apparatus, conversion unit, conversion method, and storage medium Download PDF

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CN110649987A
CN110649987A CN201810705935.8A CN201810705935A CN110649987A CN 110649987 A CN110649987 A CN 110649987A CN 201810705935 A CN201810705935 A CN 201810705935A CN 110649987 A CN110649987 A CN 110649987A
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unit
otn
scheduling
cross
sdh
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CN110649987B (en
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孙玉洁
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ZTE Corp
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ZTE Corp
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Priority to KR1020217002205A priority patent/KR102468305B1/en
Priority to PCT/CN2019/093098 priority patent/WO2020001497A1/en
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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]
    • H04J3/1664—Optical Transport Network [OTN] carrying hybrid payloads, e.g. different types of packets or carrying frames and packets in the paylaod
    • 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
    • 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
    • H04J3/1611—Synchronous digital hierarchy [SDH] or SONET
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • 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

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention discloses an optical transmission system device, a conversion unit, a conversion method and a storage medium, wherein the conversion unit is used for converting an SDH (synchronous digital hierarchy) scheduling unit of a client side service mapped with an SDH format into an optical transport network OTN (optical transport network) scheduling unit in the cross scheduling process of the client side service to a line side; and in the process of cross scheduling of the line side service to the client side, converting the OTN scheduling unit mapped with the OTN format line side service into an SDH scheduling unit. The invention realizes the cross scheduling function of SDH scheduling units on an OTN optical transmission system, effectively reduces the hardware development types and difficulty, omits the middle optical fiber transmission, effectively reduces the network level, and simultaneously effectively promotes the flexibility of the cross scheduling of the system.

Description

Optical transmission system apparatus, conversion unit, conversion method, and storage medium
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an optical transmission system device, a conversion unit, a conversion method, and a storage medium.
Background
In the Optical Transport Network system, an OTN (Optical Transport Network) Optical Transport system and an SDH (Synchronous Digital Hierarchy) Optical Transport system are two independent Optical Transport systems.
The optical transport system equipment mainly handles ethernet traffic. The scheduling unit of the SDH optical transport system equipment is a VC (Virtual Container), and as the rate of the ethernet service is higher and higher, the VC becomes difficult to install the high-speed ethernet service, so that the use of the SDH optical transport system equipment is severely limited. The OTN optical transport system device scheduling unit is an ODUn and is very suitable for installing various high-speed ethernet services, so that the optical transport system devices are all OTN optical transport system devices at present. However, part of users still want to realize the functions of part of SDH optical transport system equipment on OTN optical transport system equipment, and SDH optical transport system equipment still has obvious advantages in processing low-speed ethernet traffic, so that there is a need for OTN/SDH hybrid optical transport system equipment on which the functions of both OTN and SDH optical transport equipment can be simultaneously supported. Wherein, ODU is an abbreviation of Optical Channel Data Unit, which indicates an Optical Channel Data Unit, and n indicates a rate level.
The implementation scheme of the existing OTN/SDH mixed optical transmission system equipment comprises the following steps: the scheme of SDH optical transmission equipment and OTN optical transmission equipment mixed networking and the scheme of configuring an OTUk mixed circuit board in the OTN optical transmission equipment. According to the scheme of hybrid networking of the SDH optical transmission equipment and the OTN optical transmission equipment, a plurality of board cards are required in the equipment, and optical fiber transmission is required in the middle of the board cards; aiming at the scheme of the hybrid circuit board, various bandwidth special for supporting the OTUk hybrid circuit board of VC cross scheduling needs to be developed, the developed hardware is various, and the hardware development difficulty is increased compared with the common OTUk circuit board. Wherein, OTU is an abbreviation of optical transform Unit, which indicates an optical channel transmission Unit, and k indicates a rate level. Therefore, for the above problems of the OTN/SDH hybrid optical transport system apparatus, a simple and efficient solution has not been proposed at present.
Disclosure of Invention
In order to overcome the above-mentioned drawbacks, the present invention provides an optical transmission system device, a conversion unit, a conversion method and a storage medium, which are used to solve the problems of multiple types of hardware and difficulty in hardware development in the OTN/SDH hybrid optical transmission system device.
In order to solve the above technical problem, a conversion unit of an optical transport system device in an embodiment of the present invention is configured to convert an SDH scheduling unit that maps a synchronous digital sequence SDH format client side service into an optical transport network OTN scheduling unit in a cross scheduling process from the client side service to a line side; and in the process of cross scheduling of the line side service to the client side, converting the OTN scheduling unit mapped with the OTN format line side service into an SDH scheduling unit.
To solve the above technical problem, an optical transmission system apparatus according to an embodiment of the present invention includes: a crossover unit and a conversion unit as described above;
the cross unit is used for cross scheduling the OTN scheduling unit converted by the conversion unit to the OTN line side unit in the cross scheduling process of the client side service to the line side; and in the process of cross scheduling of the line side service to the client side, the SDH scheduling units converted by the conversion unit are cross scheduled to the SDH client side unit.
To solve the above technical problem, a method for converting an optical transmission system device in an embodiment of the present invention includes:
in the cross scheduling process from the client side service to the line side, the SDH scheduling unit of the client side service in the SDH format mapped synchronous digital sequence is converted into an optical transport network OTN scheduling unit;
and in the process of cross scheduling of the line side service to the client side, converting the OTN scheduling unit mapped with the OTN format line side service into an SDH scheduling unit.
In order to solve the above technical problem, an optical transmission system device in an embodiment of the present invention includes a memory storing a conversion program and a processor executing the conversion program to implement the steps of the method described above.
To solve the above technical problem, a readable storage medium in an embodiment of the present invention stores a conversion program, which is executable by at least one processor to implement the steps of the method as described above.
The invention has the following beneficial effects:
the embodiments of the invention realize the cross scheduling function with the SDH scheduling unit on the OTN optical transmission system, effectively reduce the hardware development types and difficulty, save the middle optical fiber transmission, effectively reduce the network level, and simultaneously effectively improve the flexibility of the system cross scheduling.
Drawings
Fig. 1 is a hybrid networking diagram of an existing OTN optical transport system device and an SDH optical transport system device;
fig. 2 is a system block diagram of an existing OTN device configured with a hybrid circuit board to implement a VC crossover function;
FIG. 3 is a schematic structural diagram of an optical transmission system apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an alternative optical transmission system apparatus in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of an alternative embodiment of the optical transmission system apparatus of the present invention;
FIG. 6 is a schematic diagram of an alternative embodiment of an optical transmission system apparatus;
fig. 7 is a traffic flow diagram when the conversion unit does not need to support VC-12 cross scheduling in the embodiment of the present invention;
fig. 8 is a traffic flow diagram when the conversion unit needs to support VC-12 cross scheduling in the embodiment of the present invention;
fig. 9 is a flowchart of a conversion method of an optical transmission system apparatus according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another optical transmission system apparatus according to an embodiment of the present invention.
Detailed Description
The SDH optical transmission system equipment is composed of an STM (Synchronous transmission Module) -N (N ═ 1, 4, 16, 64, 256) access board, a VC cross board, and a line STM-M (M ═ 16, 64, 256) board, where N and M denote rate levels. The service processing mode is that the customer STM-N service is accessed through a customer STM-N access board and is sent to a VC cross board by taking VC-4/VC-12 as a scheduling unit, the VC cross board realizes high-order VC cross (by taking VC-4 as the scheduling unit) and low-order VC cross (by taking VC-12 as the scheduling unit), the VC after cross scheduling is sent to a line STM-M board to form line STM-M transmission, the processing path from the customer STM-N service to the line STM-M service is formed above, and the SDH optical transmission system equipment can also complete the processing from the line STM-M service to the customer STM-N service at the same time.
The composition of the SDH service processing path in the OTN Optical transport system device includes a customer STM-N (N is 1, 4, 16, 64, 256) access board, an ODU (Optical Channel Data Unit) cross board, and a line OTUk (Optical transport Unit) (k is 1, 2, 3, 4) board, where the service processing mode is that a customer STM-N service is accessed through the customer STM-N access board, mapped as an ODUn (N is 0, 1, 2, 3, 4), and sent to the ODU cross board in an ODUn mode for cross scheduling, and finally sent to the line OTUk board to form a line OTUk transmission. The mapping from STM-N to ODUn is a one-to-one relationship, that is, an STM-N is converted into an ODUn. The above is a processing path from the client STM-N service to the line OTUk service, and the OTN optical transmission system device can also complete the processing from the OTUk service to the client STM-N service.
In summary, although both the SDH optical transport system device and the OTN optical transport system device process the access of the STM-N service, the processing manners are very different, and the main difference is that the service formats of cross scheduling are different, the service cross scheduled by the SDH optical transport system device is VC, and the signal format of cross scheduling by the OTN optical transport system device is ODUn, and since the ODUn and the STM-N are in a one-to-one relationship, and what is installed in the ODUn is the STM-N, the cross scheduling of the SDH service by the OTN optical transport system device is actually the cross scheduling of the STM-N.
As the traffic mainly processed by the existing optical transport system equipment is ethernet traffic, and the scheduling unit of the SDH optical transport system equipment is VC, with the increasing rate of ethernet traffic, VC becomes difficult to install high-speed ethernet traffic, so the use of SDH optical transport system equipment is severely limited, and the scheduling unit of the OTN optical transport system equipment is ODUn, which is very suitable for installing various ethernet traffic, so the existing optical transport system equipment is basically OTN optical transport system equipment, but part of users want to realize the function of part of SDH optical transport system equipment on the OTN optical transport system equipment, and the SDH optical transport system equipment still has its obvious advantage in processing low-speed ethernet traffic, so the requirement of OTN/SDH hybrid optical transport system equipment is met, and the equipment can simultaneously support the functions of OTN and SDH optical transport equipment.
For a typical OTN/SDH hybrid optical transport system device as shown in fig. 1, the device has two service scheduling functions of VC and ODUn at the same time, and the system has an SDH STM-N client access board, an SDH STM-M circuit board, an OTN STM-N access board, and an OTNOTUk circuit board at the same time. STM-N business is accessed through SDH STM-N access board, sends SDH STM-M circuit board after realizing VC cross scheduling through SDH cross board, and then STM-M signal that SDH STM-M circuit board output passes through optical fiber access OTN STM-N access board, then exports OTN OTUk circuit board after realizing the dispatch of ODUn through the OTN cross board.
In the OTN/SDH hybrid optical transport system apparatus, in order to implement conversion from an SDH STM-N service to an OTUk service, 4 boards are required to pass through, and optical fiber transmission is also required in the middle, and in order to reduce the boards that pass through and to omit the optical fiber transmission in the middle, a system implementation scheme that an OTUk hybrid circuit board is configured is adopted, as shown in fig. 2.
The OTUk mixed circuit board can be configured to carry out cross dispatching through an ODUn lower back board, can also be configured to carry out cross dispatching through a VC-4/VC-12 lower back board, an SDH STM-N access board and an OTN STM-N access board can be installed in the system, wherein the SDH STM-N access board realizes scheduling by a VC lower back board through a cross board, can realize the cross dispatching of VC with OTUk mixed circuit board through cross board, OTN STM-N access board is the back board under ODUn, the cross-board can realize cross-dispatching of ODUn with OTUk mixed circuit board through the cross-board, thus, all functions of STM-N to OTUk through VC cross dispatching can be realized only by the cooperation of the SDH STM-N access board and the OTUk mixed circuit board, and meanwhile, an ODUn cross scheduling function can be realized through the cooperation of an OTN STM-N access board and an OTUk mixed circuit board.
Although the OTUk hybrid circuit board realizes the functions of SDH STM-N access and VC cross scheduling on OTN equipment, and reduces the number of required board cards compared with the SDH service path in the traditional mode, and removes the optical fiber connection between the SDH STM-M circuit board and the OTN STM-N client board, compared with the common OTUk circuit board, the OTUk hybrid circuit board increases the difficulty of realization compared with the common OTUk circuit board due to the addition of the VC scheduling function, thereby needing to specially develop special board cards and increasing the difficulty of development, and simultaneously leading the bandwidth of the OTUk hybrid circuit board to be limited compared with the common OTUk circuit board, and the OTUk hybrid circuit board takes different values according to the k of the OTUk and needs to develop a plurality of OTUk hybrid circuit boards according to the difference of the line transmission distances.
In order to solve the technical problem, the present invention provides an optical transport system device, a conversion unit, a conversion method and a storage medium, and realizes a flexible VC cross-scheduling function between an SDH STM-N access board and a common OTUk circuit board in an OTN optical transport system by developing a VC/ODU conversion unit. Compared with the scheme of configuring the OTUk mixed circuit board, the embodiment of the invention reduces the variety of the developed single board, and the VC/ODU adapter board has relatively low complexity, thereby reducing the development difficulty, and simultaneously easily realizing wider VC bandwidth of the lower back board relative to the mixed board. The present invention will be described in further detail below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
The use of prefixes such as "first," "second," etc. to distinguish between elements is merely intended to facilitate the description of the invention and has no particular meaning in and of themselves.
Example one
An embodiment of the present invention provides a conversion unit of an optical transport system device, as shown in fig. 3 to fig. 6, where the conversion unit 5 is configured to convert an SDH scheduling unit, which maps a SDH format client side service, into an OTN scheduling unit of an optical transport network in a cross scheduling process from the client side service to a line side; and in the process of cross scheduling of the line side service to the client side, converting the OTN scheduling unit mapped with the OTN format line side service into an SDH scheduling unit.
The SDH scheduling unit comprises one of the following components: virtual containers VC, VC cells and VC of each order; the OTN scheduling unit includes one of: an optical channel data unit ODU and an ODU cell. Wherein the conversion unit may be in the form of a conversion single board.
In the embodiment of the invention, through the use of the conversion unit 5, the service of the SDH client side is transmitted from the access to the upper OTUk line, thereby reducing the number of the passing board cards, omitting the middle optical fiber transmission and reducing the network level; compared with the OTN/SDH hybrid optical transport system device configured with the OTUk hybrid circuit board shown in fig. 2, it is realized that the SDH STM-N access board on the client side can be matched with the ordinary OTUk circuit board on any line side to realize the VC cross scheduling function, and is not limited to cross scheduling with only a dedicated hybrid circuit board any more, so that the flexibility of cross scheduling of the system is improved, and the problem that the bandwidth of the OTUk optical interface of the single board on the hybrid line side and the bandwidth of the ODUk and VC on the backplane in the system shown in fig. 2 are limited is overcome; meanwhile, various mixed circuit boards do not need to be developed according to actual requirements, and the variety and difficulty of hardware development are reduced.
In some embodiments, when the SDH scheduling unit is a virtual container VC and the OTN scheduling unit is an ODU, the conversion unit 5 is specifically configured to convert the VC mapped with the SDH format client side service into the ODU in a cross scheduling process from the client side service to the line side; and in the process of cross-dispatching the line side service to the client side, converting the ODU mapped with the OTN format line side service into VC.
In some embodiments, when the SDH scheduling unit is a VC cell and the OTN scheduling unit is an ODU cell, the conversion unit 5 is specifically configured to convert the VC cell mapped to the SDH format client side service into VC, convert the converted VC into an ODU, and convert the converted ODU into an ODU cell in a cross scheduling process from the client side service to the line side; in the process of cross-dispatching the line side service to the client side, the ODU cell mapped with the OTN format line side service is converted into the ODU, the converted ODU is converted into the VC, and the converted VC is converted into the VC cell.
In some embodiments, when the SDH scheduling unit is a first-order VC and a second-order VC, and the OTN scheduling unit is an ODU, the conversion unit 5 is specifically configured to demap, in a cross scheduling process from a client side service to a line side, a first-order VC to which an SDH format client side service is mapped to a second-order VC, demap the first-order VC to which the SDH format client side service is mapped to the second-order VC, perform VC crossing on the demapped second-order VC, map the second-order VC after VC crossing to the first-order VC, and convert the mapped first-order VC to the ODU; in the process of cross-dispatching of line side services to client sides, ODUs mapped with OTN format line side services are converted into first-order VCs, the converted first-order VCs are de-mapped into second-order VCs, VC crossing is carried out on the de-mapped second-order VCs, the second-order VCs after VC crossing are mapped into the first-order VCs, and the mapped first-order VCs are converted into ODUs. Where the first order VC may be considered a high order VC, such as VC-4, and the second order VC may be considered a low order VC, such as VC-12. That is to say, the ODU mapped with the OTN-formatted line side service is converted into a first high-order VC, the high-order VC is demapped to a low-order VC, the low-order VC is cross-mapped to the high-order VC after being cross-mapped by the VC, thereby implementing cross-scheduling of the high-order VC and cross-scheduling of the low-order VC, the low-order VC (in the conversion unit) is cross-mapped to the high-order VC after being cross-mapped by the VC, and the high-order VC is recon.
Example two
An embodiment of the present invention provides an optical transmission system apparatus, as shown in fig. 3, the apparatus includes a crossing unit 3 and a converting unit 5;
the conversion unit 5 is configured to convert an SDH scheduling unit that maps a synchronous digital sequence SDH format client side service into an optical transport network OTN scheduling unit in a cross scheduling process from the client side service to the line side; and in the process of cross scheduling of the line side service to the client side, converting the OTN scheduling unit mapped with the OTN format line side service into an SDH scheduling unit.
The cross unit 3 is configured to cross-schedule the OTN scheduling units converted by the conversion unit to an OTN line-side unit in a cross-scheduling process from a client-side service to a line-side service; and in the process of cross scheduling of the line side service to the client side, the SDH scheduling units converted by the conversion unit are cross scheduled to the SDH client side unit.
The SDH scheduling unit comprises one of the following components: virtual containers VC, VC cells and VC of each order; the OTN scheduling unit includes one of: an optical channel data unit ODU and an ODU cell; the SDH format is a synchronous transmission module SDHSTM-N with different rate grades, and the OTN format is an optical channel transmission unit OTN OTUk with different rate grades. The conversion unit may adopt a conversion single board form, and the crossing unit may adopt a crossing board form.
The embodiment of the invention realizes the VC cross scheduling function between the SDH STM-N access board and the common OTUk circuit board, so that all the OTUk circuit boards can realize the VC cross scheduling function, thereby avoiding developing various OTUk mixed circuit boards special for supporting VC cross scheduling, reducing the developed hardware types, enabling the network structure of the system to be more flat, enabling the transmission and cross scheduling to be more efficient and flexible, and effectively reducing the hardware purchasing cost and the network maintenance cost of the system.
In some embodiments, the crossing unit 3 is further configured to cross-schedule the OTN scheduling unit, which maps the client-side OTN service, to the OTN line-side unit in the cross-scheduling process from the client-side service to the line-side; and in the process of cross-dispatching the line side service to the client side, cross-dispatching the OTN dispatching units for mapping the OTN format line side service to the OTN client side unit.
In some embodiments, the apparatus further comprises the SDH client side unit 2, the OTN client side unit 1, and the OTN line side unit 4;
the SDH client side unit 2 is used for demapping the SDH format client side service to SDH scheduling units in the cross scheduling process of the client side service to the line side; in the process of cross scheduling of line side services to a client side, mapping SDH scheduling units which are cross scheduled to SDH format client side services;
the OTN client side unit 1 is configured to map client side OTN services to an OTN scheduling unit in a process of cross-scheduling client side services to a line side; in the process of cross-dispatching the line side service to the client side, the cross-dispatched OTN dispatching units are demapped to obtain the client side service in the OTN format;
the OTN line side unit 4 is configured to multiplex the cross-scheduled OTN scheduling units to the line side service in the OTN format in the cross-scheduling process from the client side service to the line side; in the cross scheduling process of the road side service to the client side, the OTN format line side service is demultiplexed into OTN scheduling units containing the client side service.
In some embodiments, when the SDH scheduling unit is a VC cell and the OTN scheduling unit is an ODU cell, the conversion unit 5 is specifically configured to convert the VC cell mapped to the SDH format client side service into VC, convert the converted VC into an ODU, and convert the converted ODU into an ODU cell in a cross scheduling process from the client side service to the line side; in the process of cross-dispatching the line side service to the client side, the ODU cell mapped with the OTN format line side service is converted into the ODU, the converted ODU is converted into the VC, and the converted VC is converted into the VC cell.
In detail, as shown in fig. 3, the optical transport system device in the embodiment of the present invention may implement a VC cross function on an OTN optical transmission system, and the device includes an OTN client side unit 1, an SDH client side unit 2, a cross unit 3, an OTN line side unit 4, and a conversion unit 5; the cross unit 3 is connected to each of the other units. Wherein, the cross unit 3 can implement cross scheduling based on ODUk (k is 0, 1, 2, 3, 4) and VC (VC-4, VC-3, and VC-12), and the switching unit 5 can implement switching of ODUk (k is 0, 1, 2, 3, 4) and VC (VC-4, VC-3, and VC-12). As can be seen from the figure, after the SDH STM-N (N ═ 1, 4, 16, 64, 256) traffic accessed by the SDH client side unit completes VC interleaving through the interleaving unit 3, VC (VC-4, VC-3, and VC-12) is converted into ODUk (k ═ 0, 1, 2, 3, 4) through the conversion unit 601 (for example, VC is mapped to STM-N, STM-N is mapped to ODUk (k ═ 0, 1, 2, 3, 4), and then is interleaved and scheduled to the OTN line side unit by the interleaving unit 3, and the opposite direction can complete interleaving and scheduling of the line side unit OTUk traffic to the client unit STM-N traffic, and for the opposite direction, the conversion unit 5 converts ODUk (k ═ 0, 1, 2, 3, 4) into VC (VC-4, VC-3, and VC-12) (for example, de-k maps STM to STM-N, and then demaps the STM-N out of the VC).
The conversion unit 5 in the embodiment of the present invention includes, but is not limited to, conversion from VC to ODUk, for example, may support a cross function of a lower-order VC-12, so as to implement cross of the lower-order VC-12 in an OTN system that only supports cross of a higher-order VC.
Each unit may adopt a form of a single board, that is, the OTN client side unit 1, the SDH client side unit 2, the cross unit 3, the OTN line side unit 4, and the conversion unit 5 may be respectively expressed as an OTN client side single board, an SDH client side single board, a cross single board, an OTN line side single board, and a conversion single board. The SDH format client side service may also be expressed as a client side SDH service, and the OTN format service side service and the OTN format client side service may also be expressed as a service side OTN service and a client side OTN service, respectively.
Compared with the OTN/SDH hybrid optical transport system apparatus shown in fig. 1, in the apparatus in the embodiment of the present invention, due to the use of the conversion unit 5, the service at the SDH client side is transmitted from the access to the upper OTUk line, which reduces the number of passed board cards, and omits the intermediate optical fiber transmission, thereby reducing the network level; compared with the OTN/SDH hybrid optical transport system device configured with the OTUk hybrid circuit board in fig. 2, it is realized that the SDH STM-N access board on the client side can be matched with the ordinary OTUk circuit board on any line side to realize the VC cross scheduling function, and is not limited to cross scheduling with only a dedicated hybrid circuit board any more, so that the flexibility of cross scheduling of the system is improved, and the problem that the bandwidth of the OTUk optical interface of the single board on the hybrid line side and the bandwidth of the ODUk and VC on the backplane in the system in fig. 2 are limited is overcome; meanwhile, various mixed circuit boards do not need to be developed according to actual requirements, and the variety and difficulty of hardware development are reduced.
EXAMPLE III
An embodiment of the present invention provides an optical transmission system device, as shown in fig. 4, the device includes an OTN client side unit 1, an SDH client side unit 2, a cross unit 3, an OTN line side unit 4, and a conversion unit 5; wherein, the cross unit 3 is a bi-plane cross unit, when the SDH scheduling unit is a virtual container VC and the OTN scheduling unit is an ODU, the conversion unit 5 is specifically configured to convert the VC mapped with the SDH format client side service into the ODU in a cross scheduling process from the client side service to the line side; and in the process of cross-dispatching the line side service to the client side, converting the ODU mapped with the OTN format line side service into VC.
In detail, the OTN client-side unit 1 completes access to an OTN service, such as access to OTUk (k ═ 1, 2, 3, 4) services of different rate classes, mapping/demapping functions of OTUk (k ═ 1, 2, 3, 4) to ODUk (k ═ 0, 1, 2, 3, 4), access to OTNSTM-N (N ═ 1, 4, 16, 64, 256) services, and mapping/demapping functions of STM-N to ODUn; the SDH client side unit 2 completes the mapping/demapping function of SDH STM-N (N is 1, 4, 16, 64, 256) and VC (VC-4, VC-3 and VC-12); the centralized crossing unit 3 is a biplane centralized crossing unit; the conversion unit 5 realizes conversion of ODUk (k ═ 0, 1, 2, 3, 4) and VC (VC-4, VC-3, and VC-12). After the SDH STM-N (N1, 4, 16, 64, 256) service accessed by the SDH client side unit 201 completes VC crossing by the biplane centralized crossing unit 302, VC (VC-4, VC-3, and VC-12) is converted into ODUk (k 0, 1, 2, 3, 4) by the conversion unit 5, and then is cross-scheduled to the OTN line side unit 4 by the biplane centralized crossing unit 3, thereby realizing VC cross-scheduling between the SDH STM-N service and any OTUk line single board on the line side. And VC cross scheduling from the OTUk single board at the line side to the SDH STM-N service board at the client side can be completed in the opposite direction.
Example four
An embodiment of the present invention provides an optical transmission system device, as shown in fig. 5, where the device includes an OTN client side unit 1, an SDH client side unit 2, a cross unit 3, an OTN line side unit 4, and a conversion unit 5; the cross unit may be expressed as a centralized cell cross unit, the conversion unit may be expressed as a cell conversion unit, and when the SDH scheduling unit is a VC cell and the OTN scheduling unit is an ODU cell, the conversion unit 5 is specifically configured to convert, in a cross scheduling process from a client side service to a line side, the VC cell mapped with an SDH format client side service into VC, convert the converted VC into an ODU, and convert the converted ODU into an ODU cell; in the process of cross-dispatching the line side service to the client side, the ODU cell mapped with the OTN format line side service is converted into the ODU, the converted ODU is converted into the VC, and the converted VC is converted into the VC cell.
In detail, the OTN client-side unit 1 completes access of OTN services, such as access of OTUk (k ═ 1, 2, 3, 4) services of different rate classes, mapping/demapping of OTUk (k ═ 1, 2, 3, 4) and ODUk (k ═ 0, 1, 2, 3, 4), conversion of ODUk and CELL (odu), and access of OTN STM-N (N ═ 1, 4, 16, 64, 256) services, mapping/demapping of STM-N to odu N, and conversion of ODUn and CELL (odu); SDH client side unit 2 completes the mapping/de-mapping of STM-N and VC (VC-4, VC-3 and VC-12) and the mapping/de-mapping of VC-4 and CELL CELLs; the centralized CELL intersection unit 3 simultaneously completes the switching function of CELL CELL (ODU) based on ODUk (k is 0, 1, 2, 3, 4) and the switching function of CELL CELL (VC) based on VC (VC-4, VC-3 and VC-12); the cross scheduling unit of the line side unit 4 is an ODUk cell; the CELL conversion unit 5 realizes conversion between CELL CELLs CELL (odu) based on ODUk (k is 0, 1, 2, 3, 4) and CELL CELLs CELL (VC) based on VC (VC-4, VC-3 and VC-12), and cooperates with the centralized CELL cross unit 3 to realize VC cross scheduling from the SDH STM-N (N is 1, 4, 16, 64, 256) service at the client side to any OTUk line CELL at the line side.
EXAMPLE five
An embodiment of the present invention provides an optical transmission system device, as shown in fig. 5, where the device includes an OTN client side unit 1, an SDH client side unit 2, a cross unit 3, an OTN line side unit 4, and a conversion unit 5; in some embodiments, when the SDH scheduling unit is a first-order VC and a second-order VC, and the OTN scheduling unit is an ODU, the conversion unit 5 is specifically configured to, in a cross scheduling process from a client side service to a line side, demap a first-order VC that maps a client side service in an SDH format to a second-order VC, perform VC crossing on the demapped second-order VC, map the second-order VC after VC crossing to the first-order VC, and convert the mapped first-order VC into the ODU; in the process of cross-dispatching of line side services to client sides, ODUs mapped with OTN format line side services are converted into first-order VCs, the converted first-order VCs are de-mapped into second-order VCs, VC crossing is carried out on the de-mapped second-order VCs, the second-order VCs after VC crossing are mapped into the first-order VCs, and the mapped first-order VCs are converted into ODUs. Where the first order VC may be VC-4 and the second order VC may be VC-12.
For example, the conversion unit 5 in the embodiment of the present invention supports cross scheduling of VC-12, and is suitable for a system where only VC-4 is supported by a backplane under an SDH client side unit 2 and only VC-4 is supported by a centralized cross unit 3, to implement the function of cross scheduling of VC-12. Wherein, the conversion unit 5 may include a plurality of VC-4 cross scheduling modules 601, VC-12 cross scheduling modules 602, and VC-4 to ODUK conversion modules 603, and if the device of the conversion unit 5 in the embodiment of the present invention does not need to perform cross scheduling of VC-12, and the traffic flow is as shown in fig. 7, VC-4 from the cross unit 3 is directly scheduled by the VC-4 scheduling module 601 to the conversion module 603 of VC-4 to ODUK to be converted into an ODUK, and then is sent to the cross scheduling unit 3; if the device needs to perform cross scheduling on VC-12, the service flow is as shown in fig. 8, VC-4 from the cross unit 3 is scheduled to the VC-12 cross scheduling module 602 by the VC-4 cross scheduling module 601 to implement cross scheduling on VC-12, and VC-4 subjected to cross scheduling on VC-12 is sent back to the VC-4 scheduling module 601 to be scheduled to the VC-4-to-ODUk conversion module 603 to be converted into an ODUk, and then sent to the cross unit 301.
EXAMPLE six
An embodiment of the present invention provides a conversion method for an optical transmission system device, as shown in fig. 9, the method includes:
s101, in the cross scheduling process of client side service to line side, SDH scheduling unit of client side service of mapping synchronous digital sequence SDH format is converted into optical transport network OTN scheduling unit;
s102, in the process of cross-dispatching the line side service to the client side, the OTN dispatching unit mapping the OTN format line side service is converted into an SDH dispatching unit.
It should be noted that, in the embodiment of the present invention, the sequence of S101 and S102 may be adjusted according to an actual application scenario when the method is executed. The optical transmission system device in the embodiment of the present invention is any one of the optical transmission system devices described in the first to fifth embodiments.
In some embodiments, when the SDH scheduling unit is a virtual container VC and the OTN scheduling unit is an ODU, the converting the SDH scheduling unit that maps a synchronous digital sequence SDH format client side service into an optical transport network OTN scheduling unit in a cross scheduling process of the client side service to a line side includes:
in the cross scheduling process from the client side service to the line side, converting VC mapped with SDH format client side service into ODU;
in the process of cross-dispatching the line side service to the client side, the method for converting the OTN dispatching unit mapped with the OTN format line side service into the SDH dispatching unit comprises the following steps:
and in the process of cross-dispatching the line side service to the client side, converting the ODU mapped with the OTN format line side service into VC.
In some embodiments, when the SDH scheduling unit is a VC cell and the OTN scheduling unit is an ODU cell, the converting the SDH scheduling unit that maps a synchronous digital sequence SDH format client side service into an optical transport network OTN scheduling unit in a cross scheduling process of the client side service to a line side includes:
in the cross scheduling process from the client side service to the line side, converting VC cells mapping the SDH format client side service into VC, converting the converted VC into ODU, and converting the converted ODU into ODU cells;
in the process of cross-dispatching the line side service to the client side, the method for converting the OTN dispatching unit mapped with the OTN format line side service into the SDH dispatching unit comprises the following steps:
in the process of cross-dispatching the line side service to the client side, the ODU cell mapped with the OTN format line side service is converted into the ODU, the converted ODU is converted into the VC, and the converted VC is converted into the VC cell.
In some embodiments, when the SDH scheduling unit is a first-order VC and a second-order VC, and the OTN scheduling unit is an ODU, the converting the SDH scheduling unit that maps a synchronous digital sequence SDH format client side traffic into an optical transport network OTN scheduling unit in a cross scheduling process from the client side traffic to a line side includes:
in the cross scheduling process of the client side service to the line side, demapping a first-order VC for mapping the SDH format client side service to a second-order VC, performing VC crossing on the demapped second-order VC, and mapping the crossed second-order VC to the first-order VC; converting the mapped first-order VC into an ODU;
in the process of cross-dispatching the line side service to the client side, the method for converting the OTN dispatching unit mapped with the OTN format line side service into the SDH dispatching unit comprises the following steps:
and in the process of cross scheduling of the line side service to the client side, converting the ODU mapped with the OTN format line side service into a first-order VC, demapping the converted first-order VC into a second-order VC, and mapping the demapped second-order VC into the first-order VC.
EXAMPLE seven
An optical transmission system apparatus is provided in an embodiment of the present invention, as shown in fig. 10, the apparatus includes a memory 10 and a processor 12, the memory 10 stores a conversion program, and the processor 12 executes the conversion program to implement the steps of any one of the methods described in the sixth embodiment.
Example eight
The invention provides a readable storage medium, which stores a conversion program, wherein the conversion program can be executed by at least one processor to realize the steps of any one of the methods described in the sixth embodiment.
Embodiments of the present invention may be a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to the processor such that the processor can read information from, and write information to, the storage medium; or the storage medium may be integral to the processor. The processor and the storage medium may reside in an application specific integrated circuit.
In the specific implementation process of the sixth embodiment to the eighth embodiment, reference may be made to the first embodiment to the fifth embodiment, and corresponding technical effects are achieved.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (15)

1. A conversion unit of an optical transmission system device, wherein the conversion unit is used for converting an SDH scheduling unit mapping a synchronous digital sequence SDH format client side service into an optical transport network OTN scheduling unit in a cross scheduling process from the client side service to a line side; and in the process of cross scheduling of the line side service to the client side, converting the OTN scheduling unit mapped with the OTN format line side service into an SDH scheduling unit.
2. The conversion unit of claim 1, wherein the SDH scheduling unit includes one of: virtual containers VC, VC cells and VC of each order; the OTN scheduling unit comprises one of: an optical channel data unit ODU and an ODU cell.
3. The conversion unit according to claim 1 or 2, wherein when the SDH scheduling unit is a virtual container VC and the OTN scheduling unit is an optical channel data unit ODU, the conversion unit is specifically configured to convert the VC mapped with an SDH format client side service into an ODU in a cross-scheduling process from the client side service to a line side; and in the process of cross-dispatching the line side service to the client side, converting the ODU mapped with the OTN format line side service into VC.
4. The conversion unit according to claim 1 or 2, wherein when the SDH scheduling unit is a VC cell in a virtual container and the OTN scheduling unit is an optical channel data unit ODU cell, the conversion unit is specifically configured to convert a VC cell mapped with an SDH format client side service into a VC, convert the converted VC into an ODU, and convert the converted ODU into an ODU cell in a cross-scheduling process from the client side service to a line side; in the process of cross-dispatching the line side service to the client side, the ODU cell mapped with the OTN format line side service is converted into the ODU, the converted ODU is converted into the VC, and the converted VC is converted into the VC cell.
5. The conversion unit according to claim 1 or 2, wherein when the SDH scheduling unit is a first-order virtual container VC and a second virtual container VC, and the OTN scheduling unit is an optical channel data unit ODU, the conversion unit is specifically configured to demap a first-order VC, which maps an SDH-format client-side service, to a second-order VC, perform VC interleaving on the demapped second-order VC, map the second-order VC after VC interleaving to the first-order VC, and convert the mapped first-order VC to the ODU; in the process of cross scheduling of line side service to client side, ODU mapped with OTN format line side service is converted into first-order VC, the converted first-order VC is de-mapped to second-order VC, VC cross is carried out on the de-mapped second-order VC, and the second-order VC after VC cross is mapped to the first-order VC.
6. An optical transmission system apparatus, characterized in that the apparatus comprises a cross unit and a conversion unit according to any one of claims 1-4;
the cross unit is used for cross scheduling the OTN scheduling unit converted by the conversion unit to the OTN line side unit in the cross scheduling process of the client side service to the line side; and in the process of cross scheduling of the line side service to the client side, the SDH scheduling units converted by the conversion unit are cross scheduled to the SDH client side unit.
7. The apparatus of claim 6, wherein the cross unit is further configured to cross-schedule the OTN scheduling units mapping the client-side OTN traffic to the OTN line-side unit in a cross-scheduling process from the client-side traffic to the line-side; and in the process of cross-dispatching the line side service to the client side, cross-dispatching the OTN dispatching units for mapping the OTN format line side service to the OTN client side unit.
8. The apparatus according to claim 6 or 7, wherein said apparatus further comprises said SDH client side unit, said OTN client side unit, and said OTN line side unit;
the SDH client side unit is used for demapping the SDH format client side service into SDH scheduling units in the cross scheduling process of the client side service to the line side; mapping the cross-scheduled SDH scheduling units into SDH format client side services in the cross scheduling process of the line side services to the client side;
the OTN client side unit is used for mapping the client side OTN service to the OTN scheduling unit in the cross scheduling process of the client side service to the line side; in the process of cross-dispatching line side services to a client side, the OTN format client side services are demapped from the OTN dispatching units which are cross-dispatched;
the OTN line side unit is used for multiplexing the OTN scheduling unit which is subjected to cross scheduling to the line side service in an OTN format in the cross scheduling process from the client side service to the line side; and in the process of cross scheduling of the line side service to the client side, demultiplexing the OTN scheduling unit from the OTN format line side service.
9. The apparatus according to claim 6 or 7, wherein the SDH format is a synchronous transport module of different rate classes, and the OTN format is an optical channel transport unit of different rate classes.
10. A method of converting an optical transmission system device, the method comprising:
in the cross scheduling process from the client side service to the line side, the SDH scheduling unit of the client side service in the SDH format mapped synchronous digital sequence is converted into an optical transport network OTN scheduling unit;
and in the process of cross scheduling of the line side service to the client side, converting the OTN scheduling unit mapped with the OTN format line side service into an SDH scheduling unit.
11. The method according to claim 10, wherein when the SDH scheduling unit is a virtual container VC and the OTN scheduling unit is an optical channel data unit ODU, the converting SDH scheduling unit that maps SDH format client side traffic into an optical transport network OTN scheduling unit in a cross-scheduling process of client side traffic to line side, includes:
in the cross scheduling process from the client side service to the line side, converting VC mapped with SDH format client side service into ODU;
in the process of cross-dispatching the line side service to the client side, the method for converting the OTN dispatching unit mapped with the OTN format line side service into the SDH dispatching unit comprises the following steps:
and in the process of cross-dispatching the line side service to the client side, converting the ODU mapped with the OTN format line side service into VC.
12. The method according to claim 10, wherein when the SDH scheduling unit is a virtual container VC cell and the OTN scheduling unit is an optical channel data unit ODU cell, the converting SDH scheduling unit that maps SDH format client side traffic into an optical transport network OTN scheduling unit in a cross-scheduling process of client side traffic to a line side includes:
in the cross scheduling process from the client side service to the line side, converting VC cells mapping the SDH format client side service into VC, converting the converted VC into ODU, and converting the converted ODU into ODU cells;
in the process of cross-dispatching the line side service to the client side, the method for converting the OTN dispatching unit mapped with the OTN format line side service into the SDH dispatching unit comprises the following steps:
in the process of cross-dispatching the line side service to the client side, the ODU cell mapped with the OTN format line side service is converted into the ODU, the converted ODU is converted into the VC, and the converted VC is converted into the VC cell.
13. The method according to claim 10, wherein when the SDH scheduling unit is a first-order virtual container VC and a second-order virtual container VC, and the OTN scheduling unit is an optical channel data unit ODU, the converting SDH scheduling unit that maps SDH format client side traffic into an optical transport network OTN scheduling unit in a cross-scheduling process of client side traffic to line side includes:
in the cross scheduling process of the client side service to the line side, demapping a first-order VC for mapping the SDH format client side service to a second-order VC, performing VC cross on the demapped second-order VC, and mapping the crossed second-order VC to the first-order VC; converting the mapped first-order VC into an ODU;
in the process of cross-dispatching the line side service to the client side, the method for converting the OTN dispatching unit mapped with the OTN format line side service into the SDH dispatching unit comprises the following steps:
in the process of cross-dispatching line side service to client side, ODU mapped with OTN format line side service is converted into first-order VC, the converted first-order VC is de-mapped to second-order VC, and the de-mapped second-order VC is mapped to first-order VC.
14. An optical transmission system apparatus, characterized in that the apparatus comprises a memory storing a conversion program and a processor executing the conversion program to implement the steps of the method according to any one of claims 1-5.
15. A readable storage medium, characterized in that the storage medium stores a conversion program executable by at least one processor to implement the steps of the method according to any one of claims 1-5.
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