CN105634647B - Realize the method and system of PTN device platform forward compatibility MSTP equipment - Google Patents

Realize the method and system of PTN device platform forward compatibility MSTP equipment Download PDF

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Publication number
CN105634647B
CN105634647B CN201610007721.4A CN201610007721A CN105634647B CN 105634647 B CN105634647 B CN 105634647B CN 201610007721 A CN201610007721 A CN 201610007721A CN 105634647 B CN105634647 B CN 105634647B
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payload
cep
satop
sdh
pdh
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CN105634647A (en
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周志强
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Fiberhome Telecommunication Technologies Co Ltd
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Fiberhome Telecommunication Technologies Co Ltd
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Priority to CN201610007721.4A priority Critical patent/CN105634647B/en
Publication of CN105634647A publication Critical patent/CN105634647A/en
Priority to MYPI2018700368A priority patent/MY186763A/en
Priority to PCT/CN2016/102816 priority patent/WO2017118151A1/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
    • H04J3/1623—Plesiochronous digital hierarchy [PDH]
    • H04J3/1635—Format conversion, e.g. CEPT/US
    • 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
    • H04J3/1617—Synchronous digital hierarchy [SDH] or SONET carrying packets or ATM cells
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
    • H04L1/0008—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length by supplementing frame payload, e.g. with padding bits

Abstract

The invention discloses a kind of method and system for realizing PTN device platform forward compatibility MSTP equipment, method includes：Either SDH signal decompositions are continuous PDH payloads E1/T1/E3/T3 signals or the signals of SDH payloads VC12/VC 4 to PDH signals；According to the length of system requirements by continuous PDH payload signals according to SAToP agreements either SDH payload signals according to CEP agreements be cut into regular length PDH or SDH payload datas cut into slices, SAToP frame formats or CEP frame formats are formed by payload of the data slicer, and adds MPLS or VLAN marks and is packaged into ethernet frame and is sent to opposite end；The ethernet frame of reception is distributed to corresponding SAToP receiving modules or CEP receiving modules by opposite end, is utilized respectively differential clocks pattern recovery and goes out continuous PDH payload signals or SDH payload signals, then obtains PDH signals or SDH signals through signal recombination module.The present invention makes function of the transformation with MSTP equipment of PTN device extend the life cycle of the kind equipment so as to expand the networking capability of PTN device and scope.

Description

Realize the method and system of PTN device platform forward compatibility MSTP equipment
Technical field
The present invention relates to the communications field, and in particular to realizes the method for PTN device platform forward compatibility MSTP equipment and is System.
Background technology
At present, data delivery platform is PTN (Packet Transport Network, grouping conveying network) standard mostly Defined PTN device, the equipment are adapted to the transmission and exchange of Packet Service (such as Ethernet, IP operation), but do not possess SDH The time gas exchange and transfer capability of (Synchronous Digital Hierarchy, Synchronous Digital Hierarchy) equipment, this causes PTN device is unable to forward compatibility SDH network, and the defect causes PTN device effectively to utilize the existing MSTP based on SDH The investment of (multi-service transport platform, Multi-Service Transfer Platform) equipment, shortens the life of the kind equipment The cycle is ordered, causes the wasting of resources；From market cost angle analysis, it is desirable to be able to the PTN device platform of forward compatibility MSTP equipment.
The content of the invention
The technical problems to be solved by the invention be PTN device platform can not before mutually compatible MSTP equipment the problem of.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is to provide one kind and realizes PTN device platform The system of forward compatibility MSTP equipment,
Include at PTN device platform end：
Signal decomposition module, every the road PDH signals or SDH signals that PTN device platform is received are decomposed, and obtain PDH Signal payload E1/T1/E3/T3 or SDH signal payload VC12/VC4, and send；
SAToP sending modules, the continuous PDH signals payload E1/T1/E3/T3 is cut according to the length of system requirements PDH payload datas into regular length are cut into slices, and PDH payload datas section in Bing Weimei roads is controlled plus Fixed RTP frame heads and SAToP Word processed, obtain cutting into slices as the SAToP frames of payload with the PDH payload datas；
CEP sending modules, the continuous SDH signals payload VC12/VC4 is cut into by fixation according to the length of system requirements The SDH payload datas section of length, the section of Bing Weimei roads SDH payload datas add Fixed RTP frame heads and CEP agreement frame heads, Obtain cutting into slices as the CEP frames of payload with the SDH payload datas；
Ethernet frame package module, it is that the SAToP frames or CEP frames add MPLS/VLAN marks, each MPLS/ The corresponding payload E1/T1/E3/T3/VC4/VC12 passage of VLAN marks, is packaged into SAToP or CEP ethernet frames；
Ethernet frame sending module, by being sent to packaged ethernet frame pair based on the exchange network of ethernet frame End；
Include in opposite end：
Ethernet frame receiving module, SAToP the or CEP ethernet frames received are accordingly forwarded respectively；
SAToP receiving modules, the section of PDH payload datas is restored from the SAToP ethernet frames, and by the PDH Payload data slice graph display generates continuous PDH signals payload E1/T1/E3/T3；
CEP receiving modules, the section of SDH payload datas is restored from the CEP ethernet frames, and by the SDH payloads Data slicer restructuring generates continuous SDH signals payload VC12/VC-4；
Signal recombination module, by the continuous PDH signals payload E1/T1/E3/T3 or SDH signal payload VC12/ of restructuring VC-4 is reduced into PDH signals or SDH signals.
In such scheme, the SAToP ethernet frame formats are by label switched path or pseudo-wire label stacking, SAToP Control word, Fixed RTP frame heads and E1/T/1/E3/T3 data slicers composition.
In such scheme, the CEP ethernet frame formats are by label switched path or pseudo-wire label stacking, CEP agreements Frame head, Fixed RTP frame heads and VC12/VC4 data slicers composition.
In such scheme, the form of the Fixed RTP frame heads includes：
Version number V, it is necessary to set 2；
Filling bit P, sender must be set to 0, and recipient must ignore this bit；
Extended bit X is defined, sender must be set to 0, and recipient must ignore this bit；
Effect source count bits CC, sender must be set to 0, and recipient must ignore this bit；
Identification bit M, it is necessary to 0 is set to by sender, and recipient must ignore this bit；
Payload type PT [0:6], PT value should be by the PW dynamic value range assignments in each direction, for different CEP Between PW and direction can use same PT values；
Bag sequence number Sequence Number [0:15], often send circulation of the bag from 0 to 0xFFFF to be incremented by, opposite end can Detect whether that packet loss and the rearrangement of the bag to receiving, the value are identical with the sequence number value in control word according to this；
Timestamp value Timestamp [0:31], for carrying timing information；
Synchronisation source SSRC [0:31], available for detecting incorrect link.
In such scheme, the SAToP control words are made up of following field：
L bit, to alert indication bit, L bit sets represent that the TDM payloads in bag are invalid, and opposite end receives L bit as 1 Bag when, can be sent complete " 1 " to corresponding TDM ports；
R bit, are remote bug indication bit, and R bit put the receiving of 1 expression distal end and lost；
RSV and FRG, 0 must be set to for reserved and segmentation bits, sender, recipient must ignore this bit；
Length[0:5], it is length field, if not 0, it indicates that the length of SAToP frame heads；If use RTP frame heads then along with the length of the RTP frame heads length and load, and if the length total value grow when being less than or equal to 64 byte Degree field must be set to actual value, otherwise be set to 0；
Sequence Number[0:15], it is bag sequence number, often one data slicer of transmission circulates from 0 to 0xFFFF is incremented by, Opposite end can detect whether packet loss and the rearrangement of the bag to receiving according to this.
In such scheme, CEP Header are made up of following field：
Lbit, to alert indication bit, Lbit sets represent that the TDM payloads in data slicer are invalid, and opposite end receives L When bit is 1 data slicer, it can be sent complete " 1 " to corresponding TDM ports；
Rbit, is remote bug indication bit, and R bit sets represent that distal end receiving is lost；
N and P bits, are pointer negative justification and positive justification indication bit, and the bit is used for clearly relaying through PSN's The Pointer Justification Event of negative, positive, the use of N and P bits is optional, if do not used, N and P bits must be set to 0；
FRG, it is segmentation bits, sender must be set to 0, and recipient must ignore this bit；
Length[0:5], it is length field, if not 0, it indicates that the length of CEP frame heads；If RTP is used Frame head then along with the length of the RTP frame heads length and load, and if the total value of length when be less than or equal to 64 byte, Length field must be set to actual value, otherwise must just be set to 0；
Sequence Number[0:15], it is bag sequence number, often one data slicer of transmission circulates from 0 to 0xFFFF is incremented by, Opposite end can detect whether packet loss and the rearrangement of the bag to receiving according to this；
Structure Pointer[0:11], it is structured fingers value, structured fingers must include the SONET in payload package The biasing of the first character section of structure, is emulated for SPE, and structured fingers are located at the j1 byte in CEP data slicers, imitated for VT Very, structured fingers are located at the V5 bytes of data slicer；Structured fingers value scope from " 0 " to " 0xFFE ", " 0 " represent first Individual byte followed by CEP frame heads, when data slicer does not carry J1 or V5 bytes, structured fingers must be set to 0xFFF；
Reserved, it is reserved field, sender must be set to 0, and recipient must ignore this bit.
In such scheme, N and P bits setting is described as follows：
When N, P are set to 0, description pointer-free adjustment；
When N, P are set to 1, description Loss Of Pointer alarm；
When N, which is set to 0, P, is set to 1, positive pointer regulation is described；
When N, which is set to 1, P, is set to 0, negative pointer regulation is described.
In such scheme, the form of the SAToP or CEP ethernet frames includes：
Source address；
Destination address；
TPID tag protocol identifiers+VLAN；
Ethernet frame type；
SAToP frame formats or CEP frame formats；
Frame Check Sequence.
In such scheme,
TPID tag protocol identifiers value is expressed as 0x8100 with 16 systems；
The channel number that VLAN values and label switched path define corresponds；
Ethernet frame type value is expressed as 0x8847 with 16 systems；
Label switched path value is represented with 16 systems, and each label switched path value and E1/T1/E3/T3/VC12/ VC4 signalling channels correspond.
Present invention also offers a kind of method for realizing PTN device platform forward compatibility MSTP equipment, comprise the following steps：
Step A100, the every road PDH signals or SDH signal decompositions received PTN device platform is believed for continuous PDH Number payload E1/T1/E3/T3 or SDH signal payload VC12/VC-4；
Step A200, according to the length of system requirements by continuous PDH signals payload E1/T1/E3/T3 or SDH signal Payload VC12/VC-4, according to SAToP agreements, either CEP agreements are cut into the PDH payloads of regular length or SDH payload datas are cut Piece, and SAToP frames or CEP frames are formed for payload with payload containing PDH or the section of SDH payload datas respectively；
Step A300, MPLS/VLAN marks, each MPLS/VLAN marks corresponding one are added for SAToP frames or CEP frames Individual payload E1/T1/E3/T3/VC4/VC12 passages, are packaged into SAToP or CEP ethernet frames；
Step A400, by the exchange network based on ethernet frame, packaged SAToP or CEP ethernet frames are sent To opposite end；
Step A500, SAToP the or CEP ethernet frames of reception are distributed to corresponding SAToP and receive mould by opposite end Block or CEP receiving modules, continuous P DH signals payload or SDH signal payloads are recovered respectively, and recombinated through signal and obtain PDH letters Number or SDH signals, wherein, different PDH signals or SDH signalling channels are distinguished by MPLS/VLAN marks.
The present invention makes it have the function of MSTP equipment, it can both be used as PTN device by the transformation to PTN device With PTN device networking, MSTP equipment forward compatibility MSTP equipment networks can be also used as, are alternatively arranged as PTN network and MSTP networks Switching node equipment, so as to expand the networking capability of PTN device and scope, extend the life cycle of the kind equipment.
Brief description of the drawings
Fig. 1 is the system architecture diagram provided by the invention for realizing PTN device platform forward compatibility MSTP equipment；
Fig. 2 is the method flow diagram provided by the invention for realizing PTN device platform forward compatibility MSTP equipment.
Embodiment
The present invention is described in detail with reference to Figure of description and specific embodiment.
As shown in figure 1, the system provided by the invention for realizing PTN device platform forward compatibility MSTP equipment,
Include at PTN device platform end：Signal decomposition module 10, SAToP (Structure-Agnostic TDM over Packet, unstructured emulation) sending module 20, CEP (Circuit Emulation over Packet, circuit simulation) hair Send module 30, ethernet frame package module 40 and ethernet frame sending module 50；
Every road PDH (Plesiochronous Digital that signal decomposition module 10 receives PTN device platform Hierarchy, PDH) signal or SDH signals decomposed, obtain PDH signal payload E1/T1/E3/T3 or SDH signal payload VC12/VC4, and PDH signal payloads E1/T1/E3/T3 is sent to SAToP sending modules 20, by SDH signals Payload VC12/VC4 is sent to CEP sending modules 30；
SAToP sending modules 20, according to the length of system requirements by continuous PDH signals payload E1/T1/E3/T3 according to SAToP agreements are cut into the PDH payload datas section of regular length, and the PDH payload datas section on Bing Weimei roads adds Fixed RTP Frame head and SAToP control words, obtain cutting into slices as the SAToP frames of payload with PDH payload datas；
CEP sending modules 30 are according to the length of system requirements by continuous SDH signals payload VC12/VC4 according to CEP agreements The SDH payload datas section of regular length is cut into, SDH payload datas section in Bing Weimei roads adds Fixed RTP frame heads and CEP Header (CEP agreements frame head), obtain cutting into slices as the CEP frames of payload with SDH payload datas；
Ethernet frame package module 40 is SAToP frames or CEP frames add MPLS/VLAN marks, each MPLS/VLAN marks Know a corresponding payload E1/T1/E3/T3/VC4/VC12 passage, be packaged into SAToP or CEP ethernet frames composition Ethernet Frame；
Packaged ethernet frame by being sent to by ethernet frame sending module 50 based on the exchange network of ethernet frame Opposite end；
Include in opposite end：Ethernet frame receiving module 60, SAToP receiving modules 70, CEP receiving modules 80 and signal restructuring Module 90；
SAToP the or CEP ethernet frames of reception are sent respectively to corresponding SAToP and received by ethernet frame receiving module 60 Module or CEP receiving modules；
SAToP receiving modules 70 restore the section of PDH payload datas from SAToP ethernet frames, and according to reduction sequence The section of PDH payload datas is regrouped and generates continuous PDH signals payload E1/T1/E3/T3；
CEP receiving modules 80 restore the section of SDH payload datas from the ethernet frame of CEP frame formats, and according to reduction The section of SDH payload datas is regrouped and generates continuous SDH signals payload VC12/VC-4 by order；
Signal recombination module 90 is by the continuous PDH signals payload E1/T1/E3/T3 or SDH signal payload VC12/ of restructuring VC-4 is reduced into PDH signals or SDH signals.
In the present invention, SAToP frame formats are by LSP (MPLS)/PW (MPLS) Label Stack (label switched paths/puppet Wire tag storehouse), SAToP control words, Fixed RTP frame heads and E1/T/1/E3/T3 data slicers composition, it is specific as follows：
Wherein, SAToP Control Word (SAToP control words) frame format is：
Wherein,
L bit are alarm indication bit, and L bit sets represent that the TDM payloads in bag are invalid, and opposite end receives L bit as 1 Bag when, can be sent complete " 1 " to corresponding TDM ports；
R bit are remote bug indication bit, and R bit put the receiving of 1 expression distal end and lost；
RSV and FRG must be set to 0 for reserved and segmentation bits, sender, and recipient must ignore this bit；
Length(LEN)[0:5] it is length field, if not 0, it indicates that the length of SAToP frame heads；If use RTP frame heads are grown then along with the RTP frame heads length and the length of load, and when the length total value is less than or equal to 64 byte Degree field must be set to actual value, otherwise be set to 0；
Sequence Number[0:15] it is bag sequence number, often one data slicer of transmission circulates from 0 to 0xFFFF is incremented by, Opposite end can detect whether packet loss and the rearrangement of the bag to receiving according to this.
Fixed RTP Header (Fixed RTP frame heads) frame format is defined as：
Wherein：
V is version number, it is necessary to sets 2；
P is that filling bit must be set to 0 by sender, and recipient must ignore this bit；
X is definition extended bit, it is necessary to 0 is set to by sender, and recipient must ignore this bit；
CC is effect source count bits, it is necessary to 0 is set to by sender, and recipient must ignore this bit；
M is identification bit, it is necessary to 0 is set to by sender, and recipient must ignore this bit；
PT[0:6] it is Payload type (payload type), PT value should be by the PW dynamic values scope point in each direction Match somebody with somebody, same PT values can be used between different CEP PW and direction；
Sequence Number[0:15] it is bag sequence number, often sends circulation of the bag from 0 to 0xFFFF and be incremented by, opposite end It can detect whether that packet loss and the rearrangement of the bag to receiving, the value are identical with the sequence number value in control word according to this；
Timestamp[0:31] it is timestamp value, for carrying timing information；
SSRC[0:31] it is synchronisation source, available for detecting incorrect link.
In the present invention, CEP frame formats are：
Wherein, CEP Header (CEP agreements frame head) frame format is：
Wherein,
L bit are alarm indication bit, and the set of L bits represents that the TDM payloads in bag are invalid.Opposite end receives L bits as 1 Bag when, can be sent complete " 1 " to corresponding TDM ports；
R bit are remote bug indication bit, and R bits are put the receiving of 1 expression distal end and lost；
N and P bits, pointer pay adjustment and positive justification indication bit, and these bits are used for clearly relaying through PSN's The Pointer Justification Event of negative, positive, the use of N and P bits is optional, if do not used, N and P bits must be set to 0, N and P Bit sets description as shown in table 1.
Table 1：N and P bits set description.
FRG is segmentation bits, and sender must be set to 0 in the present invention, and recipient must ignore this bit.
Length[0:5] it is length field, if not 0, it indicates that the length of CEP heads, if RTP heads have been used Along with the length, loaded length is added when CEP heads length plus the length of load, along with RTP head length, total value is less than Or when equal to 64 byte, length field must be set to actual value, otherwise must just be set to 0；
Sequence Number[0:15], bag sequence number, often send circulation of the bag from 0 to 0xFFFF and be incremented by, opposite end can Packet loss and the rearrangement of the bag to receiving are detected whether according to this；
Structure Pointer[0:11], structured fingers value.Structured fingers must include the SONET knots in payload package The biasing of the first character section of structure, emulated for SPE, structured fingers are located at the j1 byte in CEP bags, are emulated for VT, structure V5 byte of the pointer positioned at bag；Structured fingers value scope 0 represents first character section followed by CEP heads here from 0 to 0xFFE, when When data slicer does not carry J1 or V5 bytes, structured fingers must be set to 0xFFF；Any pointer of accessory circuit changes The SONET configuration biases that (new data flag (NDF) event) can be changed in CEP bags, so as to the value for the pointer that restructures；
Reserved is reserved field, and sender must be set to 0, and recipient must ignore this bit.
As shown in Fig. 2 the method provided by the invention for realizing PTN device platform forward compatibility MSTP equipment, including it is following Step：
Step A100, the every road PDH signals or SDH signal decompositions received PTN device platform is believed for continuous PDH Number payload E1/T1/E3/T3 or SDH signal payload VC12/VC-4；
Step A200, according to the length of system requirements by continuous PDH signals payload E1/T1/E3/T3 or SDH signal Payload VC12/VC-4, the PDH payloads of regular length are cut into according to RFC4553 (SAToP) agreements or RFC4842 (CEP) agreement Or the section of SDH payload datas, and SAToP frames or CEP are formed for payload with PDH payloads or the section of SDH payload datas respectively Frame；
Step A300, MPLS/VLAN marks, each MPLS/VLAN marks corresponding one are added for SAToP frames or CEP frames Individual payload E1/T1/E3/T3/VC4/VC12 passages, are packaged into SAToP or CEP ethernet frames；With MPLS/VLAN mark with The form of too net frame is as shown in table 2, including：
Source address；
Destination address；
TPID (Tag Protocal Identifier, tag protocol identifier)+VLAN；
Ethertype (ethernet frame type)；
SAToP frame formats or CEP frame formats (i.e. LSP (Label Switched Path, label switched path) or PW The SAToP Control Word or corresponding VC12/VC4 business of (Pseudo Wire, pseudo-wire), corresponding E1/T1/E3/T3 business CEP Header, Fixed RTP Header and corresponding SAToP agreements E1/T/1/E3/T3 data slicers or corresponding CEP The VC12/VC4 data slicers of agreement；
FCS (Frame Check Sequence, Frame Check Sequence)；
Wherein, TPID values are expressed as 0x8100 with 16 systems, and the channel number that VLAN values and LSP/PW are defined corresponds, with Too the Ethertype values of net frame are expressed as 0x8847 with 16 systems, and LSP/PW values are represented with 16 systems, and each LSP/PW values Corresponded with E1/T1/E3/T3/VC12/VC4 signalling channels.
Table 2：The form of SAToP or CEP ethernet frames.
Step A400, by the exchange network based on ethernet frame, packaged SAToP or CEP ethernet frames are in base In realizing any exchange in the distributed switching architecture data equipment of Ethernet bag, any list that can be exchanged in the equipment Disk/arbitrary port, so as to be sent to opposite end.
Step A500, SAToP the or CEP ethernet frames received are forwarded to its corresponding SAToP and receive mould by opposite end Block or CEP receiving modules, continuous P DH signals are recovered by ethernet frame by SAToP receiving modules or CEP receiving modules respectively Payload or SDH signal payloads, then PDH signals or SDH signals are obtained through signal recombination module, wherein, different PDH signals or SDH signalling channels are distinguished by MPLS/VLAN marks.
In the present invention, the pass-through mode of SAToP or CEP ethernet frames is unicast, multicast and broadcast, SAToP or The selection of the pass-through mode of CEP ethernet frames is determined by destination address.
The prior art that the content not being described in detail in specification is known to the skilled person, those skilled in the art Member can carry out various modifications and variations to the embodiment of the present invention, if these modifications and variations in the claims in the present invention and its Within the scope of equivalent technologies, then these modifications and variations are also within protection scope of the present invention.

Claims (10)

  1. A kind of 1. system for realizing PTN device platform forward compatibility MSTP equipment, it is characterised in that
    Include at PTN device platform end：
    Signal decomposition module, every the road PDH signals or SDH signals that PTN device platform is received are decomposed, and obtain PDH signals Payload E1/T1/E3/T3 or SDH signal payload VC12/VC4, and send；
    SAToP sending modules, the continuous PDH signals payload E1/T1/E3/T3 is cut into admittedly according to the length of system requirements The PDH payload datas section of measured length, the section of Bing Weimei roads PDH payload datas control plus Fixed RTP frame heads and SAToP Word, obtain cutting into slices as the SAToP frames of payload with the PDH payload datas；
    CEP sending modules, the continuous SDH signals payload VC12/VC4 is cut into by regular length according to the length of system requirements SDH payload datas section, Bing Weimei roads SDH payload datas section add Fixed RTP frame heads and CEP agreement frame heads, obtain Cut into slices with the SDH payload datas as the CEP frames of payload；
    Ethernet frame package module is the SAToP frames or CEP frames add MPLS/VLAN marks, each MPLS/VLAN marks Know a corresponding payload E1/T1/E3/T3/VC4/VC12 passage, be packaged into SAToP or CEP ethernet frames；
    Ethernet frame sending module, by the way that packaged ethernet frame is sent into opposite end based on the exchange network of ethernet frame；
    Include in opposite end：
    Ethernet frame receiving module, SAToP the or CEP ethernet frames received are accordingly forwarded respectively；
    SAToP receiving modules, the section of PDH payload datas is restored from the SAToP ethernet frames, and by the PDH payloads Data slicer restructuring generates continuous PDH signals payload E1/T1/E3/T3；
    CEP receiving modules, the section of SDH payload datas is restored from the CEP ethernet frames, and by the SDH payload datas Slice graph display generates continuous SDH signals payload VC12/VC-4；
    Signal recombination module, by the continuous PDH signals payload E1/T1/E3/T3 or SDH signal payload VC12/VC-4 of restructuring also It is former into PDH signals or SDH signals.
  2. 2. the system as claimed in claim 1 for realizing PTN device platform forward compatibility MSTP equipment, it is characterised in that described SAToP ethernet frame formats by label switched path or pseudo-wire label stacking, SAToP control words, Fixed RTP frame heads and E1/T/1/E3/T3 data slicers form.
  3. 3. the system as claimed in claim 1 for realizing PTN device platform forward compatibility MSTP equipment, it is characterised in that described CEP ethernet frame formats by label switched path or pseudo-wire label stacking, CEP agreements frame head, Fixed RTP frame heads and VC12/VC4 data slicers form.
  4. 4. the system for realizing PTN device platform forward compatibility MSTP equipment as claimed in claim 2 or claim 3, it is characterised in that institute Stating the form of Fixed RTP frame heads includes：
    Version number V, it is necessary to set 2；
    Filling bit P, sender must be set to 0, and recipient must ignore this filling bit P；
    Extended bit X is defined, sender must be set to 0, and recipient must ignore this and define extended bit X；
    Effect source count bits CC, sender must be set to 0, and recipient must ignore this effect source count bits CC；
    Identification bit M, it is necessary to 0 is set to by sender, and recipient must ignore this identification bit M；
    Payload type PT [0:6], PT value should by the PW dynamic value range assignments in each direction, for different CEP PW it Between and direction can use same PT values；
    Bag sequence number Sequence Number [0:15], often send circulation of the bag from 0 to 0xFFFF to be incremented by, opposite end can be according to this Detect whether packet loss and the rearrangement of the bag to receiving, bag sequence number Sequence Number [0:15] value and SAToP controls Sequence number value in word is identical；
    Timestamp value Timestamp [0:31], for carrying timing information；
    Synchronisation source SSRC [0:31], available for detecting incorrect link.
  5. 5. the system as claimed in claim 2 for realizing PTN device platform forward compatibility MSTP equipment, it is characterised in that described SAToP control words are made up of following field：
    L bit, to alert indication bit, L bit sets represent that the TDM payloads in bag are invalid, and opposite end receives the bag that L bit are 1 When, it can be sent complete " 1 " to corresponding TDM ports；
    R bit, are remote bug indication bit, and R bit put the receiving of 1 expression distal end and lost；
    RSV and FRG, for reserved and segmentation bits, sender must be set to 0, and recipient must ignore this for reserved and segmentation Bit；
    Length[0:5], it is length field, if not 0, it indicates that the length of SAToP frame heads；If Fixed is used RTP frame heads then along with the Fixed RTP frame heads length and load length, and if the length total value be less than or equal to 64 words During section, length field must be set to actual value, otherwise be set to 0；
    Sequence Number[0:15], it is bag sequence number, often sends a data slicer and incremental, opposite end is circulated from 0 to 0xFFFF Packet loss and the rearrangement of the bag to receiving can be detected whether according to this.
  6. 6. the system as claimed in claim 3 for realizing PTN device platform forward compatibility MSTP equipment, it is characterised in that CEP Header is made up of following field：
    Lbit, to alert indication bit, Lbit sets represent that the TDM payloads in data slicer are invalid, and opposite end receives L bit as 1 Data slicer when, can be sent complete " 1 " to corresponding TDM ports；
    Rbit, is remote bug indication bit, and R bit sets represent that distal end receiving is lost；
    N and P bits, are pointer negative justification and positive justification indication bit, the bit be used for clearly relaying through the negative of PSN and Positive Pointer Justification Event, the use of N and P bits is optional, if do not used, N and P bits must be set to 0；
    FRG, it is segmentation bits, sender must be set to 0, and recipient must ignore this segmentation bits；
    Length[0:5], it is length field, if not 0, it indicates that the length of CEP frame heads；If Fixed is used RTP frame heads then along with the Fixed RTP frame heads length and load length, and if the length total value be less than or equal to 64 When byte, length field must be set to actual value, otherwise must just be set to 0；
    Sequence Number[0:15], it is bag sequence number, often sends a data slicer and incremental, opposite end is circulated from 0 to 0xFFFF Packet loss and the rearrangement of the bag to receiving can be detected whether according to this；
    Structure Pointer[0:11], it is structured fingers value, structured fingers must include the SONET structures in payload package First character section biasing, emulated for SPE, structured fingers be located at the j1 byte in CEP data slicers, for VT emulation, Structured fingers are located at the V5 bytes of data slicer；Structured fingers value scope from " 0 " to " 0xFFE ", " 0 " represent first character Section followed by CEP frame heads, when data slicer does not carry J1 or V5 bytes, structured fingers must be set to 0xFFF；
    Reserved, it is reserved field, sender must be set to 0, and recipient must ignore this reserved field bit.
  7. 7. the system as claimed in claim 6 for realizing PTN device platform forward compatibility MSTP equipment, it is characterised in that N and P bits setting is described as follows：
    When N, P are set to 0, description pointer-free adjustment；
    When N, P are set to 1, description Loss Of Pointer alarm；
    When N, which is set to 0, P, is set to 1, positive pointer regulation is described；
    When N, which is set to 1, P, is set to 0, negative pointer regulation is described.
  8. 8. the system for realizing PTN device platform forward compatibility MSTP equipment as claimed in claim 2 or claim 3, it is characterised in that institute Stating the form of SAToP or CEP ethernet frames includes：
    Source address；
    Destination address；
    TPID tag protocol identifiers+VLAN；
    Ethernet frame type；
    SAToP frame formats or CEP frame formats；
    Frame Check Sequence.
  9. 9. the system as claimed in claim 8 for realizing PTN device platform forward compatibility MSTP equipment, it is characterised in that
    TPID tag protocol identifiers value is expressed as 0x8100 with 16 systems；
    The channel number that VLAN values and label switched path define corresponds；
    Ethernet frame type value is expressed as 0x8847 with 16 systems；
    Label switched path value is represented with 16 systems, and each label switched path value and E1/T1/E3/T3/VC12/VC4 letters Number passage corresponds.
  10. A kind of 10. method for realizing PTN device platform forward compatibility MSTP equipment, it is characterised in that comprise the following steps：
    Step A100, the every road PDH signals or SDH signal decompositions received PTN device platform is that continuous PDH signals are net Lotus E1/T1/E3/T3 or SDH signal payload VC12/VC-4；
    Step A200, according to the length of system requirements by continuous PDH signals payload E1/T1/E3/T3 or SDH signal payload VC12/VC-4, according to SAToP agreements, either CEP agreements are cut into the PDH payloads of regular length or SDH payload datas are cut into slices, and SAToP frames or CEP frames are formed for payload with payload containing PDH or the section of SDH payload datas respectively；
    Step A300, MPLS/VLAN marks are added for SAToP frames or CEP frames, corresponding one of each MPLS/VLAN marks are net Lotus E1/T1/E3/T3/VC4/VC12 passages, are packaged into SAToP or CEP ethernet frames；
    Step A400, by the exchange network based on ethernet frame, packaged SAToP or CEP ethernet frames are sent to pair End；
    Step A500, opposite end by SAToP the or CEP ethernet frames of reception be distributed to corresponding SAToP receiving modules or CEP receiving modules, recover continuous P DH signals payload or SDH signal payloads respectively, and recombinate through signal obtain PDH signals or SDH signals, wherein, different PDH signals or SDH signalling channels are distinguished by MPLS/VLAN marks.
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