CN101578795B - Digital transmission system and digital transmission method - Google Patents

Digital transmission system and digital transmission method Download PDF

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Publication number
CN101578795B
CN101578795B CN200880002089.8A CN200880002089A CN101578795B CN 101578795 B CN101578795 B CN 101578795B CN 200880002089 A CN200880002089 A CN 200880002089A CN 101578795 B CN101578795 B CN 101578795B
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signal
client signal
frame
speed
digital
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CN101578795A (en
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木坂由明
大原拓也
相泽茂树
宫本裕
武井和人
远藤靖行
三浦克吉
二阶堂忠信
富泽将人
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NTT Electronics Corp
Nippon Telegraph and Telephone Corp
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NTT Electronics Corp
Nippon Telegraph and Telephone Corp
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Priority claimed from JP2007008299A external-priority patent/JP5091489B2/en
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Priority claimed from PCT/JP2008/050433 external-priority patent/WO2008087975A1/en
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Abstract

A digital transmission system having at least a client device and a transmission device and rate-adjusting a client signal transmitted from the client device to the transmission device as necessary, to accommodate/multiplex the signal in a frame, is provided. The transmission device has a rate adjusting unit and a framer processing unit. The rate adjusting unit encapsulates the client signal usinga predetermined frame structure, and inserts an idle pattern, as necessary, to perform rate adjustment to a bit rate that can be accommodated in the frame. The framer processing unit accommodates/mul tiplexes the signal into the frame after the rate adjustment. The digital transmission system accommodates, or accommodates and multiplexes, a bit string of the client signal directly in a payload portion, accommodates, or accommodates and multiplexes, the bit string in the payload portion after subjecting it to a reversible digital signal processing.

Description

Digital transmission system and digital delivery method
Technical field
The present invention relates to a kind of digital transmission system and digital delivery method.In more detail, the present invention relates to a kind of multiple client signal is held pellucidly or multiplexing after the digital transmission system and the digital delivery method that transmit.
Background technology
In the past, mainly set up digital transmission system in order to hold telephone line, as the multiplexing approach that is used for transmitting effectively the signal that telephone line flows through, adopted the SONET based on U.S.'s ansi standard (Synchronous Optical Network) (with reference to non-patent literature 1) of standardized SDH (Synchronous Digital Hierarchy) among the ITU-T and identical with SDH in fact standard.
At present, along with popularizing of the Internet etc., except sound sound communication amount in the past, also increase data traffic, and data traffic accounts for a big chunk.Like this, as the client signal that is contained in the network, standardization is also used the signal with various bit rates, form.Give one example, near 10Gbit/s, have 10GbE LAN PHY (10.3125Gbit/s), ODU2 (10.0373Gbit/s), the so multiple client signal of STM-64 (9.95328Gbit/s).
In view of this situation, be not only SONET/SDH, as the platform that ATM, Ethernet multiple client signal such as (registered trade marks) are transmitted pellucidly, in ITU-T standardization to transmit (WDM:Wavelength Division Multiplexing) mode with wavelength division multiplexing be the optical transfer network (OTN:Optical Transport Network) (with reference to non-patent literature 2) of prerequisite, for example utilized the introducing fast development of the network of OTN1201 as shown in figure 12, wherein the wavelength division multiplexing load mode can adapt to exploding of internet communication amount.
Figure 12 is a structure chart of representing an example of network configuration in the past.Figure 12 represents that OTN1201 is connected to SONET/SDH network 1202 and Ethernet 1203.More specifically, OTN1201 is connected to SONET/SDH network 1202 by the SONET/SDH that conveyer 1204 is had with transponder (transponder) 1205, and also the Ethernet that is had by conveyer 1206 is connected to Ethernet 1203 with transponder 1207.
In addition, in recent years, improve gradually for the user's request of transparent transmission, transparent transmission is the transmission means that sends to the other side with original form in data communication.For example, the mode that is used for 10GbE LAN PHY signal is received into pellucidly OTN platform (OTU2 after the overclocking (overclock)) is discussed among the ITU-T, is represented the necessity of transparent transmission as the situation of G.Sup43 documentation (with reference to non-patent literature 3).
Have again, put down in writing in the GFP (Generic framingprocedure) (with reference to non-patent literature 4) of regulation, No. 3480444 communique of Japan Patent (with reference to patent documentation 1) that GFP is expanded in ITU-T suggestion G.7041 and be used for the mechanism that speed is adjusted a plurality of client signal, these also have is prerequisite and the problem that can't carry out transparent transmission with specific coded system (8B/10B coding) all.
Have, the demand of LAN (LocalArea Network) environment that directly connects remote dispersed and distributed at LAY-PHY (physical layer) is more and more higher again.In addition, exist in the ethernet signal and use preamble, the user of interFrameGap (IFG:Inter Frame Gap), device provisioning merchant (with reference to non-patent literature 5) with the standard alone different with ieee standard.Therefore, in the carrier network, not several ethernet signals of integral multiple for bit rate, need transparent transmission to comprise preamble beyond the frame, IFG in interior signal integral body.
Yet, the client signal of OTN is to be the signal of prerequisite with the SONET/SDH signal, client signal bit rate as OTN has defined 2.48832Gbit/s, 9.95328Gbit/s, 39.81312Gbit/s, and bit rate and 1GbE signal, 10GbE signal are different.As transparent and hold the method that has with the 10GbELAN PHY signal of the different bit rates of client signal of present standardized OTN effectively, be extensive use of the OTN of above-mentioned overclocking mode.The application of overclocking mode is meant, ratio with 10.3125/9.95328 only improves bit rate, can not change frame structure, function of OTN etc. thus, the 10GbE LAN PHY signal of 10.3125Gbit/s as client signal, directly is contained in the payload of OTN.
Figure 13 show based on conventional art, STM-64 signal and 10GbE LAN PHY signal directly be contained in the payload zone of OTU frame and the structure chart of the digital transmission system that carries out transmitting behind the wavelength division multiplexing and the structure chart of OTU frame structure.Under the situation of the OTU frame shown in the bottom that 10GbE LAN PHY signal 1302a is contained in Figure 13, in conveyer 1304, adopt the overclocking mode, additional overhead, FS (the fixing filling: Fixed Stuff) byte, FEC, improve bit rate thus, in the OTU of 11.0957Gbit/s frame, directly hold 10GbE LAN PHY signal.OTN is prerequisite with WDM, and difference also can carry out wavelength division multiplexing to realize hicap even bit rate is pressed each wavelength, therefore obtains popularizing widely.Have again,, also do not need the signal processing of appending, can realize effectively holding, therefore, as mentioned above, in ITU-T, also this method has been carried out documentation (with reference to non-patent literature 3) with low price even when holding the 10GbE-LANPHY signal.
As Figure 12 explanation, when in network in the past, holding multiple client signal,, prepare transponder (SONET/SDH transponder 1205 and Ethernet transponder 1207) by the kind of client signal, hold client signal.In addition, when adopting the overclocking mode to hold 10GbELAN PHY signal in the OTU frame, bit rate is different when holding the STM-64 signal, and wavelength division multiplexing number is carried out in biography transmission with a plurality of bit rates.Yet, prepare the flexibility and the high problem of cost that exist the shortage transponder to be equipped with in the mode of the transponder corresponding (optical transceiver module, frame treatment circuit) with the kind of client signal.
In addition, in network in the past during treatment S DH system, Ethernet system both sides' multiple client signal, based on the reasons such as difference of bit rate of client signal, the client signal behind the coding decoded reduce bit rate to carry out the speed adjustment with the payload of the network that holds this client signal.For example, the client signal that adopts the 8B/10B coded system is decoded, bit rate is reduced to 80%.Have, the part of deletion client signal is carried out the speed adjustment again.For example, deletion IFG reduces bit rate when transmission 10GbE LAN PHY signal.Yet, the problem that exists the method for this reduction transparency to satisfy to improve gradually in recent years to the user's request of transparent transmission.
In addition, when in 40Gbit/s OTN system, client signal being carried out when multiplexing since with 10Gbit/s signal time division multiplexing to the 40Gbit/s signal, therefore can not allow the difference of bit rate.Also promptly, in common 40Gbit/s OTN system,, can't multiplexingly hold the different 10GbE LAN PHY signal of bit rate though can multiplexingly hold the STM-64 signal.In addition, in the 40Gbit/s of overclocking OTN system,, can't multiplexingly hold the STM-64 signal though can multiplexingly hold 10GbE LAN PHY signal.Thereby, in the 40Gbit/s of 1 wavelength signal, can't be with STM-64 signal and 10GbE LAN PHY signal hybrid multiplex.Therefore, when transmitting STM-64 signal and 10GbE LAN PHY signal singly, for the 40Gbit/s to the 40Gbit/s of multiplexing STM-64 signal and multiplexing 10GbE LAN PHY signal carries out wavelength division multiplexing, need 40Gbit/s signal 2 wavelength, existence can't improve the problem of holding efficient.
Summary of the invention
The present invention makes in view of this problem, its purpose is to provide a kind of can be held the multiple client signal with different bit rates and hold and carry out multiplexingly, can realize that low cost and raising hold digital transmission system and digital delivery method efficient, realize transparent transmission for each client signal.
Patent documentation 1: No. 3480444 communique of patent
Non-patent literature 1:ITU-TG.707, " Network node interface for the synchronous digital hierarchy (SDH) "
Non-patent literature 2:ITU-TG.709, " Interfaces for the Optical TransportNetwork (OTN) "
Non-patent literature 3:ITU-TG.Sup43, " Transport of IEEE 10G Base-R in Optical Transport Networks (OTN) "
Non-patent literature 4:ITU-TG.7041, " Generic framing procedure (GFP) "
Non-patent literature 5:H.Ichino et al., IJHSES, vol.15, no.3, pp.191-228,2005
The 1st side of the present invention is a kind of digital transmission system, between transmission side network and receiver side network, carry out the transmitting-receiving of signal, transmission side network possesses client terminal device and conveyer at least, as required, the client signal that sends to conveyer from client terminal device is carried out the speed adjustment and held or hold and carry out multiplexing to hold speed, conveyer possesses: the speed adjustment part, its use possesses the expense of regular length of regulation and the frame structure of payload, encapsulate after this expense appended to client signal, and as required, to the additional idle pulley (pattern) of the client signal of encapsulation, carrying out that speed is adjusted into can be to hold the bit rate that speed is held; With the framer handling part, its with the client signal of the adjusted encapsulation of speed to hold speed and hold or hold and to carry out multiplexing; The Bit String of client signal directly held in payload portions or holds and carry out multiplexing or, after having implemented reversible Digital Signal Processing, in payload portions, hold or hold and carry out multiplexing.
The 2nd side of the present invention is a kind of digital delivery method, it is the digital delivery method in the digital transmission system, digital transmission system carries out the transmitting-receiving of signal between transmission side network and receiver side network, transmission side network possesses client terminal device and conveyer at least, as required, to after the client signal that conveyer sends is carried out the speed adjustment, hold or hold and carry out multiplexing from client terminal device to hold speed, conveyer comprises: use the expense of the regular length that possesses regulation and the frame structure of payload, encapsulate after this expense appended to client signal, and as required, to the additional idle pulley of the client signal of encapsulation, carrying out that speed is adjusted into can be to hold the bit rate that speed is held; With with the client signal of the adjusted encapsulation of speed to hold speed and hold or hold and to carry out multiplexing; The Bit String of client signal directly held in payload portions or holds and carry out multiplexing or, after having implemented reversible Digital Signal Processing, in payload portions, hold or hold and carry out multiplexing.
The 3rd side of the present invention is a kind of digital transmission system, the multiple client signal that will have different bit rates in digital frame, hold or multiplexing after transmit, from the digital frame that receives, to hold or multiplexing signal separates, the output client signal, digital transmission system possesses the speed adjustment unit, for the client signal except client signal in the multiple client signal with bit rate, adopt specific anchor-frame, false pattern is inserted into this anchor-frame, improve the bit rate of this client signal thus, speed is adjusted the bit rate of multiple client signal pellucidly in the bit rate scope that can be contained in the digital frame.
The 4th side of the present invention is a kind of digital delivery method, the multiple client signal that will have different bit rates in digital frame, hold or multiplexing after transmit, from the digital frame that receives, separate and hold or multiplexing signal, the output client signal, in the digital delivery method, for the client signal except client signal in the multiple client signal with bit rate, adopt specific anchor-frame, false pattern is inserted in this anchor-frame, improve the bit rate of this client signal thus, speed is adjusted the bit rate of multiple client signal pellucidly in the bit rate scope that can hold in digital frame.
According to the present invention, can provide a kind of and multiple client signal with different bit rates can be held and held and carry out multiplexingly, can realize that low cost and raising hold digital transmission system and digital delivery method efficient, realize transparent transmission for each client signal.
Description of drawings
Fig. 1 is the block diagram of summary of the digital transmission system of explanation one embodiment of the present invention.
Fig. 2 schematically shows the figure that is used for client signal is adjusted into the rate adjusting method that holds speed in the digital transmission system of one embodiment of the present invention.
Fig. 3 A is the figure that the speed adjustment of explanation one embodiment of the present invention can adapt to synchronization map.
Fig. 3 B is the figure that the speed adjustment of explanation one embodiment of the present invention can adapt to asynchronous mapping.
Fig. 4 is the figure of rate adjusting method in the digital transmission system of expression one embodiment of the present invention.
Fig. 5 is the figure of the frame structure of applicable GFP in the digital transmission system of one embodiment of the present invention.
Fig. 6 A is that the overhead part that schematically shows the frame structure of expense with regular length and payload is the figure of the mode of 1 bit.
Fig. 6 B is the figure of an example of common data format of expression and idle pulley form.
Fig. 7 is that the overhead part that schematically shows the frame structure of expense with regular length and payload is the figure of the mode of 2 bits.
Fig. 8 is the figure that as the client signal of different kinds STM-64 signal and 10GbE LAN PHY signal is carried out the example that holds after the speed adjustment in the transfer system of expression one embodiment of the present invention.
Fig. 9 A holds the figure of the example of 10GbE LANPHY signal in the digital transmission system of expression one embodiment of the present invention.
Fig. 9 B holds the figure of the example of STM-64 signal in the digital transmission system of expression one embodiment of the present invention.
Figure 10 holds the figure of the example of client signal in the digital transmission system of expression one embodiment of the present invention.
Figure 11 is the speed adjustment part in the digital transmission system of expression one embodiment of the present invention and the figure of the structure of framer handling part.
Figure 12 is a structure chart of representing an example of network configuration in the past.
Figure 13 be the expression conventional art, STM-64 signal and 10GbE LAN PHY signal directly held in the payload zone of OTU frame and the structure chart of the digital transmission system that carries out transmitting behind the wavelength division multiplexing and the structure chart of OTU frame structure.
Figure 14 is the basic block structured figure expression one embodiment of the present invention, that the multiple client signal with different bit rates carried out the digital transmission system that multiplexing back transmits.
Figure 15 is that expression is held in the processing of client signal, the figure of an example of the process of conversion bit rate gradually.
Figure 16 is the figure of anchor-frame configuration example of the speed adjustment usefulness of expression STM-64 signal.
Figure 17 A is basic block structured figure when representing not carry out error monitoring, that the multiple client signal with different bit rates carried out the digital transmission system that transmits multiplexing back.
Figure 17 B is the basic block structured figure that expression is one embodiment of the present invention, when carrying out error monitoring, the multiple client signal with different bit rates carried out the digital transmission system that multiplexing back transmits.
Figure 18 is the basic block structured figure expression one embodiment of the present invention, that the multiple client signal with different bit rates carried out the digital transmission system that multiplexing back transmits.
Figure 19 is the basic block structured figure expression one embodiment of the present invention, that the multiple client signal with different bit rates carried out the digital transmission system that multiplexing back transmits.
Figure 20 is the structure chart of an example that adopt, the ODU frame structure in the digital transmission system expression one embodiment of the present invention, that the multiple client signal with different bit rates is carried out transmitting multiplexing back.
Embodiment
In the of the present invention the 1st and the 2nd side, be characterised in that, when as required a plurality of client signal being carried out the speed adjustment, in client signal, insert idle pulley, adjust the bit rate of carrying out multiplexing client signal, in transmitting the frame of usefulness, hold afterwards and carry out multiplexing.More specifically,, encapsulate a plurality of client signal by using the frame structure of certain particular rate adjustment usefulness, and, in client signal, insert idle pulley as required and carry out the speed adjustment.
In addition, in the of the present invention the 1st and the 2nd side, the Bit String of client signal directly held in payload portions or holds and carry out multiplexing or, after having implemented reversible Digital Signal Processing, in payload portions, hold or hold and carry out multiplexingly, realize not being the transparent transmission of prerequisite thus with specific coded system.
In the of the present invention the 3rd and the 4th side, in order to ensure the transparency of client signal, can not implement any processing to the bit sequence of client signal, for example additional new expense waits carries out the speed adjustment.
Below, with reference to drawing, describe embodiments of the present invention in detail.In this manual in each accompanying drawing of reference, to having the part mark prosign of same function.
Fig. 1 is the block diagram of summary of the digital transmission system 100 of explanation one embodiment of the present invention.Digital transmission system 100 comprises conveyer 101 and client terminal device 102 in transmission side network at least, comprises conveyer 121 and client terminal device 122 at least at the receiver side network.
More specifically, conveyer 101 possesses at least: the client accommodation section 110 that receives client signal from client terminal device 102; The client signal that receives is carried out the speed adjustment and this client signal carried out the speed adjustment part 111 of alarm transmission described later, performance monitoring; With the adjusted client signal of speed to hold speed and hold or hold and to carry out multiplexing framer handling part 112; To be sent to the transport unit 113 of the conveyer 121 of receiver side network from the signal that framer handling part 112 receives.In addition, conveyer 101 and client terminal device 102 portion within it possess the CPU that centralized control is installed separately, and in addition, each installs the memory that also possesses the handled signal of interim preservation in the inside.
On the other hand, conveyer 121 possesses client accommodation section 130, speed adjustment part 131, framer handling part 132 and transport unit 133.Transport unit 133 will be transferred framer handling part 132 to from the client signal that transport unit 113 receives.Framer handling part 132 takes out client signal from the above-mentioned speed of transferring of holding, speed adjustment part 131 turns back to the client signal of taking out signal before the speed adjustment and carries out alarm transmission described later, performance monitoring for this client signal, and client accommodation section 130 will send to client terminal device 122 from the client signal that speed adjustment part 131 receives.In addition, conveyer 121 and client terminal device 122 possess the CPU that centralized control is installed separately in the portion within it, and in addition, each installs the memory of the signal that also possesses interim preservation processing in the inside.
Fig. 2 schematically shows the figure that is used for client signal is adjusted into the rate adjusting method that holds speed in the speed adjustment part 111 of digital transmission system 100 of one embodiment of the present invention.That is to say, speed adjustment part 111 as described later, by according to the bit rate of client signal, change frame structure, change idle pulley length or change any means or combination some of them method in the method that idle pulley inserts frequency, multiple client signal can be adjusted into same bit rate and hold or hold and carry out multiplexing.Here, " hold speed " in this specification and be meant, the bit rate of the regulation during transparent transmission in the digital transmission system 100 transmits to meet the client signal that this mode of holding speed is adjusted to the bit rate of regulation.
Below, the flow process according to this speed is adjusted describes.At first, the Bit String of speed adjustment part 111 client signal that will receive through client accommodation sections 110 from client terminal device 102 is divided every the N bit that is predetermined (N is a natural number).Then, handle the Bit String of N bit speed adjustment part 111 as a piece, and the expense (M bit, M are nonnegative integer) that is predetermined length is appended in this piece, encapsulates client signal thus.That is to say that by the processing of this encapsulation, the bit rate of client signal is increased to (M+N)/N doubly.
Speed adjustment part 111 is except increasing this bit rate, and also additional as required idle pulley carries out the speed adjustment thus.That is to say that speed adjustment part 111 is by adjusting frequency and the position that idle pulley inserts, the speed adjustment that the client signal that is encapsulated after the additional overhead is adjusted into the bit rate of holding the regulation shown in the speed becomes possibility.The length of idle pulley can be and the block size identical (being the M+N bit) of encapsulation or can be different.In addition, for convenience of explanation, expense shown in Figure 2 is represented the preceding additional situation of piece, yet the position of additional overhead can be the front and back both sides of piece or can only be the rear of piece.
Have again, the network that holds a side of client signal has the mechanism that absorbs bit rate errors usually, therefore for the precision of the adjusted bit rate of speed of client signal, do not need to adjust to fully the bit rate shown in the speed of holding of expectation.For example, among the OTN1201 shown in Figure 12, the error of the bit rate permission ± 20ppm of regulation is therefore in this scope, just as long as in the scope of holding the bit rate ± 20ppm shown in the speed, can carry out the speed adjustment, then client signal can be held or held and carry out multiplexing.
For aforesaid rate adjusting method, in ITU-T suggestion G.7041/Y.1303, put down in writing its implementation, but the method for regulation is that the client signal with the 8B/10B coding form is a prerequisite in this suggestion, the 8B/10B sign indicating number of encoding earlier in addition afterwards is encoded to the 64B/65B sign indicating number again and (also is, 8/10 * 65/64=13/16=0.8125 of the initial bit rate that client signal had Bit String doubly) and be received into mode (GFP-T:Transparent GFP) in the gfp frame, therefore can not realize on the principle holding of client signal transparent in the bit levels.
On the other hand, the invention is characterized in, with client signal directly be contained in payload portions or, implement to be contained in payload portions after the reversible Digital Signal Processing, can hold client signal pellucidly.Thereby,, do not have user's client signal alone of regulation in can the use standard by transparent digital delivery.
Above-mentioned rate adjusting method, bit rate by client signal, handle as long as implement as required, for example, under the situation of the client signal of the bit rate in having the allowed band of holding speed originally, conveyer 101 need not carry out the speed adjustment, and as long as hold or hold and carry out multiplexing to hold speed.
Fig. 3 A and Fig. 3 B are the figure that the speed adjustment of explanation one embodiment of the present invention can adapt to synchronization map and asynchronous mapping both sides.Synchronization map is meant, the state that client terminal device 301 and conveyer 302 are worked under synchronous clock.In addition, asynchronous mapping is meant, the state that client terminal device 311 and conveyer 312 are worked under different respectively clocks.Also promptly, carry out possessing device 303 in the conveyer 302 of synchronization map, the clock that it extracts the client signal that receives from client terminal device 301 carries out frequency division/frequency multiplication, carries out synchronization map thus.
Do not adopt idle pulley as shown in Figure 2 and only adopt the rate adjusting method of fixing frame, need increase clock in certain proportion, therefore can only adapt to synchronization map.On the other hand, the rate adjusting method of one embodiment of the present invention owing to except the speed adjustment of the encapsulation of adopting frame structure, can also adopt idle pulley, therefore can adapt to the both sides of synchronization map and asynchronous mapping.
Fig. 4 schematically shows the figure that is used for the different client signal 1～4 of a plurality of kinds held or hold and carry out the method that multiplexing speed adjusts in the digital transmission system of one embodiment of the present invention.
Speed adjustment part 111 can by according to the bit rate of client signal, change frame structure, change idle pulley length or change any means or combination some of them method in the method that idle pulley inserts frequency, carry out multiplexing after different types of a plurality of client signal are adjusted with the bit rate of holding the regulation shown in the speed.Also promptly, carry out the speed adjustment as mentioned above like that, in this speed was adjusted, according to the bit rate of each client signal, to encapsulating after the client signal additional overhead, and additional idle pulley was adjusted into the bit rate of holding the regulation shown in the speed.
As mentioned above, owing in the network of a side of holding client signal, can absorb common bit rate errors, therefore, do not need a plurality of client signal to be adjusted into and to hold the identical bit rate of bit rate of the regulation shown in the speed, as long as be adjusted into the bit rate in the allowed band.In addition, in a plurality of client signal, as long as the client signal in the allowed band that exists original bit rate to belong to hold speed for this client signal, need not be carried out the speed adjustment and holds and carry out multiplexing getting final product.
Fig. 5 is the figure of the frame structure of the GFP of expression with the expense of regular length and payload.Gfp frame has the core head part of 4 bytes, the payload head part of 4 bytes, the extension header part (optional) of 0～60 byte, the payload zone of n byte and the FCS (FCS, optional) of 4 bytes.
This gfp frame is to can be applicable in the digital transmission system of one embodiment of the present invention.In addition, as the method for the frame structure that adopts regular length among the GFP, stipulated the GFP-T mode, yet as mentioned above, this mode and difference of the present invention being, is prerequisite with the signal of 8B/10B coding form, can't carry out transparent transmission in addition.
In the digital transmission system of one embodiment of the present invention,, can alarm any of transmission or performance monitoring or the both sides of alarm transmission and performance monitoring by utilizing the extension header part of gfp frame shown in Figure 5.Below, alarm transmission and performance monitoring are described.
Alarm transmission realizes by following manner: detect alarm signals such as the MS-AIS, the Generic-AIS that stipulate among the OTN, shutdown, the specific bit mode corresponding with the abnormality shown in the detected alarm signal is contained in the zone that sets in advance in the extension header part.More specifically, speed adjustment part 111 is under the situation of the unusual alarm signal that detects the client signal that expression receives from client accommodation section 110, will the specific bit mode corresponding be inserted into the head region of GFP, notify this abnormality to conveyer 121 with the abnormality shown in this alarm signal.In addition, also can alarm transmission in the speed adjustment part 131 in the conveyer 121 of receiver side.Also promptly, when when framer handling part 132 receives the adjusted signal of speed, speed adjustment part 131 detects alarm signal from this signal, notify this abnormality to client accommodation section 130.
In addition, between speed adjustment part 111 and speed adjustment part 131, carry out performance monitoring.Also be, the zone of the regulation of speed adjustment part 111 in being located at the extension header part holds predetermined bit mode, 131 pairs of speed adjustment parts should the zone the bit mistake count, infer bit error rate thus, the performance monitoring of the adjusted client signal of speed is carried out in speed adjustment part 111.
Fig. 6 A is that the overhead part that schematically shows the frame structure of expense with regular length and payload is the figure of the mode of 1 bit.As an example of this mode of application, enumerated the 64B/65B coding, also be, each client signal 64 bit is added the expense of 1 bit and makes it to become the mode that is sent behind 65 bits.
Fig. 6 B is the figure of an example of common data format of expression and idle pulley form.Show in common data format, will make into bit 63 counter-rotating of client signal of piece and the bit that obtains is expense and additional mode.By such setting, receiving from a side of the client signal of conveyer 101 transmissions, continuous detecting goes out any of " 01 ", " 10 " or idle pulley, can set up frame synchronization thus.As an example of idle pulley form, considered the form that the reserve area by the fixed mode of 8 bits and 57 bits constitutes.In this example, in the above-mentioned receiver side, the mistake of overhead part is counted, can also infer bit error rate thus.
In addition, in the above description, be encoded to example with 64B/65B and describe, still,, can also use 32B/33B coding etc. as the example shown in Fig. 6 A.
Fig. 7 is that the overhead part that schematically shows the frame structure of expense with regular length and payload is the figure of the mode of 2 bits.As an example of this mode of employing, enumerated the 64B/66B coding, also be, each client signal 64 bit is added the expense of 2 bits and makes it to become the mode that is sent behind 66 bits.This frame structure is used in 10GbE LAN PHY, and this mode can also be used for other signals.In addition,, the mistake of overhead part is counted, can also be inferred bit error rate thus receiving from a side of the client signal of conveyer 101 transmissions.
Fig. 8 is in the digital transmission system of expression one embodiment of the present invention, STM-64 signal and 10GbE LAN PHY signal are carried out the figure of situation about holding after the speed adjustment as the client signal of different kinds.
With regard to the bit rate of each client signal, STM-64 is 9.95328Gbit/s ± 20ppm, and 10GbE LAN PHY is 10.3125Gbit/s ± 100ppm.Thereby, when setting is held under the situation that speed is 10.3125Gbit/s, the speed adjustment part utilizes above-mentioned rate adjusting method, the client signal of STM-64 is adjusted into 10.3125Gbit/s ± 100ppm, on the other hand, with regard to the client signal of 10GbE LAN PHY, do not carry out the speed adjustment and directly output, any thus client signal also can be adjusted into the speed of holding of expectation.
Be adjusted into the holding after the speed of expectation, shown in Fig. 9 A and Fig. 9 B, framer handling part 112 the adjusted client signal of speed is held in the OTU frame that the back is transmitted with the OTU2 of overclocking or, as shown in figure 10, multiplexing/framer handling part respectively STM-64 signal and 10GbE LAN PHY signal are held in the OTU frame after, 4 client signal of a plurality of kinds coexistences are carried out multiplexing back, are transmitted with the OTU3 of overclocking.In addition, in OTN, as optical channel unit of transfer (OTU:Optical Channel Transport Unit), to the different OTU frame of each bit rate, also promptly, OTU1, OTU2 and OTU3 standardize.
Figure 11 is the figure of the structure of expression speed adjustment part 1101 of one embodiment of the present invention and framer handling part 1102.By the serial transfer mode, speed adjustment part 1101 that has connected the speed of adjusting client signal and the framer handling part 1102 that speed adjusted client signal is held in OTU frame etc.
In this structure, under biased situation of the occurrence frequency of 0 in the client signal and 1 or 0 or 1 continuous very longways situation, before the speed adjustment of client signal, carry out scramble (scramble) in the speed adjustment part 1101 earlier and handle, 0 and 1 occurrence frequency is equated and can improve the frequency of 0 to 1 or 1 to 0 counter-rotating.
Because it is reversible processing that scramble is handled, therefore can not reduce because of this processing causes the transparency of client signal.In addition, can also obtain the advantage that framer handling part 1102 extracts clocks etc. easily by this processing.
Figure 14 is the basic block structured figure expression one embodiment of the present invention, that the multiple client signal with different bit rates carried out the digital transmission system that multiplexing back transmits.Client signal is 2 STM-64 signal 1401a, 1401b and 2 10GbE LAN PHY signal 1402a, 1402b.The circuit that carries out the speed adjustment is a anchor-frame that adopt to insert false pattern in the speed adjustment part 1403,1404, toward speed adjustment STM-64 signal 1401a, 1401b pellucidly near the bit rate 10.3125Gbit/s of 10GbE LAN PHY signal.About the speed adjustment of this STM-64 signal, will narrate in the back with reference to Figure 16.
In the conveyer 1405 of transmitter side, the adjusted STM-64 signal of speed 1401a, 1401b and 10GbE LAN PHY signal 1402a, 1402b are carried out multiplexing, be sent to receiver side through transmitting road 1406.In the conveyer 1407 of receiver side, from received signal, separate adjusted STM-64 signal of output speed and 10GbE LAN PHY signal.For the adjusted STM-64 signal of speed, the circuit that the bit rate of the adjusted client signal of speed is reduced to original bit rate is that false pattern is deleted by speed reduction portion 1408,1409 from anchor-frame, is reduced to output after the bit rate of original client signal (1401a ', 1401b ').Therefore this conveyer 1405 adopts the overclocking mode owing to hold the 10GbE LAN PHY signal of 10.3125Gbit/s, client signal is carried out 4 the bit rates of OTN signal after multiplexing become 44.6Gbit/s.
For the multiple client signal that will have different bit rates is held in digital frame or multiplexing in the transmission of 1 bit rate, thereby adopt specific anchor-frame, the bit rate of client signal is increased in the client signal near the bit rate.Usually, the bit rate for the client housing region of the digital frame that transmits usefulness allows scope to a certain degree.For example, in the regulation of OTN system, the bit rate errors of the scope of permission ± 20ppm.This is that the bit rate of existing digital frame is defined in the situation in certain scope, also has the aligning (justification) by digital frame to handle the situation that the equifrequent synchronizing function allows.Thereby, with regard to the speed adjustment of multiple client signal, even do not make bit rate in full accord, as long as digital frame is carried out speed conversion in admissible scope with different bit rates.At this moment,, the bit sequence of client signal is not implemented any processing, for example wait and carry out the speed adjustment by applying new expense in order to ensure the transparency of client signal.
In the OTN of international standard, pass through registration process, maximum can absorb ± frequency shift (FS) till the 65ppm, but owing to the frequency accuracy of 10GbE LAN PHY signal is ± 100ppm, therefore, in the present embodiment, the byte area of using about registration process (also is, OPU), the byte number of each OTU frame is made as 1 byte to 2 bytes, to enlarge frequency adjustment range.
Figure 15 shows in the processing of holding client signal, the example of the process of conversion bit rate gradually.Be respectively 9.95328Gbit/s ± 20ppm and 10.3125Gbit/s ± 100ppm as the STM-64 signal of client signal and the bit rate of 10GbE LAN PHY signal.With regard to 10GbELAN PHY signal, do not implement any processing, directly be contained in the digital frame.With regard to the STM-64 signal, in order to be converged in the bit rate scope that can in digital frame, hold, thereby adopt anchor-frame and the scope of 10.3125Gbit/s ± 100ppm in the raising bit rate, in digital frame, hold.Here, conveyer is in order to hold 10GbE LAN PHY signal, expansion registration process function, so that can allow ± bit rate of 100ppm is offset.This is, in order to hold the 10GbE LAN PHY signal of frequency accuracy for ± 100ppm, as mentioned above, by enlarge the OTU frame to the mode of the scope of mutatis mutandis byte etc., enlarge the frequency adjustment range of alignment function, also can realize.In the present embodiment,, the byte number of each OTU frame is made as 1 byte to 2 bytes, therefore, as shown in figure 15, can allows ± 65ppm * 2=± frequency shift (FS) of 130ppm for OPU.Utilize this alignment function, 10GbE LAN PHY signal and the adjusted STM-64 signal of speed are carried out holding after the Frequency Synchronization.Thereby,, therefore can also carry out time division multiplexing to OTU frame more at a high speed owing to obtain the Frequency Synchronization of a plurality of client signal.
Figure 16 is the figure of anchor-frame configuration example of the speed adjustment usefulness of expression STM-64 signal.Here, the N bit 1602b of the STM-64 signal 1601 before speed is adjusted, the false pattern 1602a (N, M are natural number) of insertion M bit is one group with false pattern M bit and client signal N bit, constitutes anchor-frame.Here, the value of M and N need be set at the bit rate 9.95328Gbit/s and the frequency accuracy ± 20ppm thereof that adopt STM-64 signal 1601, make that (9.95328 ± 20ppm) * (M+N)/N belongs to the open ended bit rate scope that transmits with digital frame.With regard to inserting false pattern 1602a for the STM-64 signal 1602 and 10GbELAN PHY signal 1603 of speed adjustment, in bit rate being adjusted at the scope that can in transmitting, hold with digital frame after, be received or multiplexing.In this specification, will be every the N of STM-64 signal bit, the ratio M/N that inserts the false pattern of M bit is called false pattern and inserts ratio.
Among the standardized OTN, the frequency accuracy of client signal is ± 20ppm among the ITU-T, and the frequency accuracy of 10GbE LAN PHY signal is ± 100ppm.The frequency accuracy of permission ± 100ppm, the method that the client signal of 10GbE LAN PHY signal is mapped to the OTU frame comprise that the bit rate with the OTU frame allows the method to ± 100ppm.Thereby, consider the frequency accuracy ± 20ppm of STM-64 signal and the frequency accuracy ± 100ppm of 10GbE LAN PHY signal, false pattern is inserted ratio M/N, in the open ended bit rate scope that is converged in digital frame, need be set at (9.95328-20ppm)/((10.3125+100ppm)-(9.95328-20ppm)) is above, the scope below (9.95328+20ppm)/((10.3125-100ppm)-(9.95328+20ppm)).
Shown in the bottom of Figure 16, the false pattern 1602a of M bit comprises frame synchronization mode 1604a.In order from anchor-frame, to separate client signal and speed reduction back output at receiver side, need to differentiate the position of false pattern.Therefore, frame synchronization mode 1604a is set in speed adjustment part 1403,1404 in false pattern, and speed reduction portion 1408,1409 judges whether frame synchronization mode 1604a to occur with the anchor-frame cycle, differentiates false pattern insertion position, deletes false pattern 1602a.Usually, the signal of digital communication system comprises the frame synchronization mode that is used to carry out frame synchronization, this in client signal too.For fear of because of the false pattern of the frame synchronization mode omission used in the client signal, thereby, use the frame synchronization mode different with client signal as the differentiation frame synchronization mode of false pattern insertion position.For example, in the present embodiment, the differentiation of false pattern insertion position can be made as the reversing mode of F628 with frame synchronization mode, but be not limited to this.
In addition, the zone beyond the frame synchronization mode 1604a in the false pattern 1602a is made as scrambling mode 1604b, can avoids same code continuous thus.As the circuit that carries out the speed adjustment (also be, the speed adjustment part) with the circuit that transmits with the digital frame processing (also is, the conveyer of transmitter side) interface, adopt under the situation that serial data signal connects, light signal connects, receiver side carries out Clock Extraction, carries out later digital processing with this extraction clock.In this case, if the continuous situation continued of same code occurs, then can't carry out Clock Extraction.As illustration in the present embodiment, by in false pattern 1602a, comprising scrambling mode 1604b, can avoid same code continuous thus, can relax the requirement condition of the continuous endurance of same code of timing extraction circuit.
The example that false pattern is inserted ratio has been shown in the following table 1.Be transformed to when the signal rate with 9.95328Gbit/s under the situation of signal of 10.3125Gbit/s, it is very big that least common multiple becomes, and needs to adopt very long frame carry out the speed adjustment, therefore unrealistic.Yet, utilize the digital frame that transmits usefulness (in the present embodiment, the OTU frame of OTN) frequency that had is adjusted function, even do not make the bit rate of multiple client signal of different bit rates in full accord thus, also can hold in the digital frame of same bit rate or multiplexing.Illustrated in the present embodiment 4 client signal have been carried out time division multiplexing, the example that transmits as the OTN signal of 44.6Gbit/s, but also can not carry out time division multiplexing, and 4 OTN signals are carried out transmitting behind the wavelength division multiplexing.In this case, owing to can make the transmission bit rate of conveyer identical in each wavelength, therefore can reduce the cost of optical transceiver module, frame treatment circuit.In addition, in the present embodiment, the speed adjustment part is arranged on the outside of conveyer, but this speed adjustment part can be arranged on also between the client accommodation section (not shown) and framer handling part (not shown) in the conveyer.
[table 1]
The false pattern of table 1 is inserted the example of ratio
STM-64 signal (N) False pattern (M) After the speed adjustment (N+M) Bit rate after the speed adjustment [Gbit/s] Error [ppm]
194 7 201 10.31241897 7.8575
388 14 402 0.31241897 7.8575
471 17 488 10.3125279 -2.7053
582 21 603 10.31241897 7.8575
665 24 689 10.31249612 0.3762
748 27 775 10.31255615 -5.4448
776 28 804 10.31241897 7.8575
859 31 890 0.3124787 2.0658
942 34 976 10.3125279 -2.7053
3677 133 3810 10.31329801 77.383
3675 133 3808 10.31349394 96.382
Figure 17 A is the basic block structured figure that represents not carry out to carry out under the situation of error monitoring, to the multiple client signal with different bit rates the digital transmission system that transmits multiplexing back.Figure 17 B is expression basic block structured figure under situation one embodiment of the present invention, that carry out error monitoring, that the multiple client signal with different bit rates carried out the digital transmission system that transmits multiplexing back.In the execution mode shown in Figure 17 B, speed adjustment part 1703-2,1704-2 carry out the speed adjustment carried out in the speed adjustment part 1403,1404 of execution mode shown in Figure 14, and when client signal 1701a-2,1701b-2 are carried out the speed adjustment, carry out the error detection of client signal, further in the specific region of false pattern, insert error monitoring information, carry out speed adjustment part 1703-2,1704-2 from transmitter side thus to the speed reduction 1708-2 of portion of receiver side, the error monitoring of 1709-2.
Among Figure 17 A and Figure 17 B, to circuit (also be in the rate adjustment process that has adopted anchor-frame, the speed adjustment part) compares with the system works of carrying out the situation of error monitoring with the situation that transmits when making a mistake between the circuit of handling with digital frame (conveyer of transmitter side also promptly), do not carry out error monitoring.
When not carrying out under the situation of error monitoring, among the conveyer 1707-1 of receiver side, do not detect mistake, only client terminal device 1700e-1,1700f-1 detect mistake.Owing to have only client terminal device 1700e-1,1700f-1 can detect mistake, therefore can't determine which place in the system makes a mistake.
Under the situation of carrying out error monitoring, speed adjustment part 1703-2,1704-2 do not have mistake by the error monitoring of client signal in the client signal that can confirm to be held.Then, among the conveyer 1707-2 of receiver side, do not detect mistake, detect mistake and have among the speed reduction 1708-2 of portion, the 1709-2 of same function and client terminal device 1700e-2, the 1700f-2 with the speed reduction portion 1408,1409 of execution mode shown in Figure 14.Because the interval of conveyer does not detect mistake, therefore can differentiate between the conveyer 1705-2 of speed adjustment part 1703-2,1704-2～transmitter side of transmitter side or, make a mistake between the conveyer 1707-2～speed reduction 1708-2 of portion, the 1709-2 of receiver side any.As the error monitoring information in the specific region that is inserted into false pattern, can adopt CRC, the BIP etc. that use among Ethernet, the SDH.
In addition, in the present embodiment, the speed adjustment part is arranged on the outside of conveyer, but this speed adjustment part can be arranged on also between the client accommodation section (not shown) and framer handling part (not shown) in the conveyer.
Figure 18 is the basic block structured figure expression one embodiment of the present invention, that the multiple client signal with different bit rates carried out the digital transmission system that multiplexing back transmits.When high unusual of the error rate that client signal has taken place, need to differentiate and which place to take place unusual at.In the present embodiment, the speed adjustment carried out in the speed adjustment part 1403,1404 of execution mode shown in Figure 14 is carried out in speed adjustment part 1803,1804, and when client signal 1801a, 1801b are carried out the speed adjustment, carry out the performance monitoring of client signal, when detecting when unusual, speed adjustment part 1803,1804 is inserted into holding in (payload) zone of false pattern or client signal with the AD HOC corresponding with abnormality, to receiver side notice abnormality.By abnormality is notified to receiver side, thus, the receiver side device, also be, the speed reduction portion 1808,1809 and client terminal device 1800e, the 1800f that have a same function with the speed reduction portion 1408,1409 of execution mode shown in Figure 14 can discern unusual occurrence positions, whether can judge needs to take the maintenance behavior.
In addition, in the present embodiment, the speed adjustment part is arranged on the outside of conveyer, but this speed adjustment part can be arranged on also between the client accommodation section (not shown) and framer handling part (not shown) in the conveyer.
Figure 19 is the basic block structured figure expression one embodiment of the present invention, that the multiple client signal with different bit rates carried out the digital transmission system that multiplexing back transmits.In the present embodiment, can speed adjustment part 1903,1904 is identical with the speed adjustment part of the execution mode shown in Figure 14,17B and 18.The signal disconnection takes place in the road 1906 if the conveyer of receiver side 1907 detects to transmit, then send Generic-AIS (Alarm IndicationSignal) signal 1901a ', 1901b ', 1902a ', 1902b ', in client terminal device 1900e, 1900f, 1900g, 1900h notice upper reaches signal, unusual situation takes place to receiving client-side.When in the speed reduction portion 1408,1409 with execution mode shown in Figure 14 has the speed reduction portion 1908,1909 of same function, carrying out the speed reduction and handling, need this Gerleric-AIS signal (maintenance signal also promptly) 1901a ', 1901b ' are transferred to client terminal device 1900e, 1900f.When in speed reduction portion 1908,1909, carrying out the speed reduction, when (also being from the handling part that transmits with digital frame, the conveyer 1907 of receiver side) detects under the situation of the unusual maintenance signal of representing the upper reaches signal, same maintenance signal 1901a ', 1901b ' are sent to client terminal device 1900e, 1900f with the bit rate after the speed reduction.Thus, client terminal device 1900e, 1900f can detect abnormality.
In addition, when having adopted the SDH device,, adopt MS-AIS (Multiplex Section-Alarm Indication Signal) signal as maintenance signal as conveyer.Even carry out in speed adjustment part and speed reduction portion under the situation of rate adjustment process and speed reduction processing, maintenance signal must be sent to the receiver side client terminal device.Thereby, when speed reduction portion detects maintenance signal, have the bit rate of the client signal after speed is reduced, export the maintenance signal identical, to receiver side client terminal device notice fault state with detected maintenance signal.
In addition, in the present embodiment, the speed adjustment part is arranged on the outside of conveyer, still, this speed adjustment part can be arranged between the client accommodation section (not shown) and framer handling part (not shown) in the conveyer.
Figure 20 be one embodiment of the present invention, the multiple client signal with different bit rates is carried out the structure chart that digital transmission system adopted, the ODU frame structure that transmit multiplexing back.In the present embodiment, different with the execution mode shown in Figure 14, the 17B, 18 and 19, framer handling part (not shown) in the conveyer of transmitter side also carries out the speed adjustment, the conveyer of transmitter side inserts false pattern and constitutes anchor-frame in transmitting with the specific region of digital frame, realize the speed adjustment of client signal.In the conveyer of transmitter side, in the OTU frame, in the process of multiplexing client signal, with regard to client signal, at first in the ODU frame, hold, then in the OTU frame, hold or multiplexing.With regard to 10GbE LAN PHY signal, do not implement any processing, and directly in the ODU of overclocking frame, hold.In the present embodiment, conveyer owing to handle with the digital frame one with transmission, does not therefore need to get again frame synchronization in order to carry out the speed adjustment, do not need to have the informing function of performance monitoring, fault state yet, can carry out the speed adjustment with MIN circuit.
An example of the structure chart of ODU frame structure has been shown in the bottom of Figure 20.In the ODU frame, bit rate when being contained in the payload zone is not consistent with client signal being carried out multiplexing in order to make the bit rate of having held the multiplexed signals of the ODU frame of the client signal of low speed more, thereby the ad-hoc location in the payload zone inserts the FS byte as false pattern.Usually, when holding the client signal of 10Gbit/s, the Fs byte is inserted into the scope of 16 byte streams * 4 row in the payload zone of 3808 bytes * 4 row.Yet, when holding the STM-64 signal, the zone of FS byte is extended to 148 bytes by 16 bytes, carry out the speed adjustment thus.The FS byte area is changed to 148 byte streams, the STM-64 signal with the ratio of (3808-16)/(3808-148) by speed conversion, become the bit rate of 10.3125Gbit/s-24.2ppm, can carry out multiplexing with the ODU frame that has held 10GbE LAN PHY signal.The insertion scope of change FS byte can change with MIN circuit thus and carry out the speed adjustment like this.In the present embodiment, the FS byte is inserted into 1 zone, but also can be divided into many places and inserts.In addition, do not insert the FS byte, can set the insertion scope yet with byte unit with byte stream unit.Adjust by this speed, the adjusted STM-64 signal of speed falls in the scope of bit rate 10.3125Gbit/s ± 100ppm of 10GbE LAN PHY signal, similarly can hold with the client signal of 10.3125Gbit/s or multiplexing.
More than, about various execution modes, show client signal is carried out the example that transmits after the time division multiplexing, but do not carry out time division multiplexing, also can carry out transmitting behind the wavelength division multiplexing.In this case, because the transmission bit rate of conveyer is identical in each wavelength, therefore can reduce the cost of optical transceiver module, frame treatment circuit.

Claims (21)

  1. A digital transmission system, between the transmission side and the reception side ,the network for signal transmission and reception, the transmission-side network, at least the client apparatus and transmitting apparatus, from the client apparatus to the transmission apparatus transmits a customer side to accommodate the rate signal can not accommodate, or receiving and multiplexing the case of the client signal to the rate adjustment to the rate of the receiving capacity, or receiving and multiplexing, the rate of the receiving means, the digital transmission system requirements of transparent transmission bit rate,
    Described conveyer possesses:
    The speed adjustment part, its use possesses the expense of regular length of regulation and the frame structure of payload, encapsulate after this expense appended to described client signal, and, carry out speed and be adjusted into and hold the bit rate that speed is held with described the additional idle pulley of the client signal of described encapsulation; With
    The framer handling part, its with the client signal of the adjusted described encapsulation of speed with described hold speed hold or hold and carry out multiplexing,
    The Bit String of described client signal directly held or holds in described payload portions and carry out multiplexing or, implemented in payload portions, to hold or hold after the reversible Digital Signal Processing and carry out multiplexing,
    Possessing the expense of regular length of described regulation and the frame structure of payload is the gfp frame structure,
    When described speed adjustment part detects the unusual alarm signal of the described client signal of expression, will the specific bit mode corresponding be inserted into the head region of GFP, notify this abnormality to the receiver side network that receives client signal from described conveyer with the represented abnormality of this alarm signal.
  2. 2. digital transmission system according to claim 1 is characterized in that,
    This expense that possesses the frame structure of the expense of regular length of described regulation and payload is any bit in 1 bit or 2 bits.
  3. 3. digital transmission system according to claim 1 is characterized in that,
    Described receiver side network also possesses:
    The 2nd conveyer, its conveyer from described transmission side network receives client signal; With
    The 2nd speed adjustment part, it is arranged in the 2nd conveyer;
    When described the 2nd speed adjustment part detects the unusual alarm signal of expression speed adjusted client signal, notify this alarm signal to the receiver side network that receives client signal.
  4. 4. digital transmission system according to claim 1 is characterized in that,
    Described speed adjustment part is provided with the zone of regulation in the head part of described frame structure,
    Hold predetermined bit mode in this zone, in the receiver side network, this regional bit mistake is counted, infer bit error rate thus, carry out performance monitoring by the adjusted client signal of described speed adjustment part speed.
  5. 5. digital transmission system according to claim 2 is characterized in that,
    Described speed adjustment part is provided with the zone of regulation in the head part of described frame structure,
    Hold predetermined bit mode in this zone, in the receiver side network, this regional bit mistake is counted, infer bit error rate thus, carry out performance monitoring by the adjusted client signal of described speed adjustment part speed.
  6. 6. digital transmission system according to claim 1 is characterized in that,
    Described client signal comprises at least a signal in 10GbE LAN PHY signal or the STM-64 signal,
    Described conveyer adopts the OTU frame of optical transfer network OTN.
  7. 7. digital transmission system according to claim 1 is characterized in that,
    The client signal that described speed adjustment part will hold is carried out scramble and is held or hold after handling and carry out multiplexing.
  8. 8. digital delivery method, it is the digital delivery method in the digital transmission system, described digital transmission system carries out the transmitting-receiving of signal between transmission side network and receiver side network, described transmission side network possesses client terminal device and conveyer at least, can not hold or hold and carry out under the multiplexing situation to hold speed to the client signal that conveyer sends from client terminal device, described client signal is carried out after the speed adjustment holding or holding and carry out multiplexing with the described speed of holding, the bit rate of described regulation when holding speed and being meant transparent transmission in the described digital transmission system, in the described digital delivery method
    By described conveyer
    Use possesses the expense of regular length of regulation and the frame structure of payload, encapsulate after this expense appended to described client signal, and, carry out speed and be adjusted into and hold the bit rate that speed is held with described the additional idle pulley of the client signal of described encapsulation;
    The client signal of the adjusted described encapsulation of speed is held or held and carry out multiplexing with the described speed of holding;
    The Bit String of described client signal directly held or holds in described payload portions and carry out multiplexing or, implemented in payload portions, to hold or hold after the reversible Digital Signal Processing and carry out multiplexing,
    Possessing the expense of regular length of described regulation and the frame structure of payload is the gfp frame structure,
    When in described speed adjustment, detecting the unusual alarm signal of the described client signal of expression, will the specific bit mode corresponding be inserted into the head region of GFP, notify this abnormality to the receiver side network that receives client signal from described conveyer with the represented abnormality of this alarm signal.
  9. 9. digital transmission system, the multiple client signal that will have different bit rates in digital frame, hold or multiplexing after transmit, from the described digital frame that receives, will hold or multiplexing signal separates, export described client signal,
    Described digital transmission system possesses: the speed adjustment unit, for the client signal except client signal in the described multiple client signal with bit rate, adopt specific anchor-frame, the false pattern that will comprise frame synchronization mode is inserted into this anchor-frame, improve the bit rate of this client signal thus, in the bit rate scope in being contained in described digital frame pellucidly speed adjust the bit rate of described multiple client signal; With
    The speed reduction unit adopts described frame synchronization mode to differentiate the zone of described false pattern, deletes described false pattern, and speed is reduced into the bit rate of original client signal.
  10. 10. digital transmission system according to claim 9 is characterized in that,
    For the client signal except client signal in the described multiple client signal with bit rate, with the ratio of the bit number of the bit number of described false pattern and this client signal before the speed adjustment is that the mode of M: N is inserted described false pattern and constituted described specific anchor-frame, and the bit rate and the frequency accuracy of this client signal is made as B cWith ± A cSituation under, set the value of N and M, so that (B c± A c) * (M+N)/N becomes the bit rate scope that can be contained in the described digital frame, and wherein M, N are natural number.
  11. 11. digital transmission system according to claim 9 is characterized in that,
    Described frame synchronization mode is the pattern different with the frame synchronization mode of client signal.
  12. 12. digital transmission system according to claim 9 is characterized in that,
    Described false pattern comprises scrambling mode.
  13. 13. digital transmission system according to claim 10 is characterized in that,
    The OTU frame that adopts OTN is as described digital frame, described multiple client signal comprises STM-64 signal and 10GbE LAN PHY signal, set false pattern insert ratio (M/N) for (9.95328-20ppm)/((10.3125+100ppm)-(9.95328-20ppm)) is above, (9.95328+20ppm)/below ((10.3125-100ppm)-(9.95328+20ppm)), insert described false pattern for described STM-64 signal and carry out the speed adjustment.
  14. 14. digital transmission system according to claim 13 is characterized in that,
    Alignment function by the OPU that comprised as the described OTU frame of described digital frame makes described multiple client signal Frequency Synchronization.
  15. 15. digital transmission system according to claim 10 is characterized in that,
    Adopt the specific region of described false pattern, carry out error monitoring.
  16. 16. digital transmission system according to claim 10 is characterized in that,
    When described client signal being carried out the speed adjustment, carry out the performance monitoring of described client signal, when detecting when unusual, described speed adjustment unit will the AD HOC corresponding with abnormality be inserted into the payload zone of described false pattern or described client signal, to receiver side notice abnormality.
  17. 17. digital transmission system according to claim 9 is characterized in that,
    Carrying out speed when reduction, when the handling part from the digital frame of receiver side detected the unusual maintenance signal of expression upper reaches signal, the bit rate of described speed reduction unit after with the speed reduction sent maintenance signal.
  18. 18. digital transmission system according to claim 9 is characterized in that,
    By in the specific region in the payload zone of described digital frame, inserting described false pattern, constitute described specific anchor-frame.
  19. 19. digital transmission system according to claim 18 is characterized in that,
    The OTU frame that adopts OTN adopts to have changed and inserts the FS byte in zone as described false pattern as described digital frame.
  20. 20. digital transmission system according to claim 19 is characterized in that,
    Described multiple client signal comprises STM-64 signal and 10GbE LAN PHY signal, and for described STM-64 signal, the scope of the described FS byte that will insert in the payload zone of described OTU frame is made as the capable scanning frequency rate adjustment of going forward side by side in 148 bytes * 4.
  21. 21. a digital delivery method, the multiple client signal that will have different bit rates in digital frame, hold or multiplexing after transmit, from the described digital frame that receives, separate and hold or multiplexing signal, export described client signal,
    Described digital delivery method comprises:
    For the client signal except client signal in the described multiple client signal with bit rate, adopt specific anchor-frame, the false pattern that will comprise frame synchronization mode is inserted in this anchor-frame, improve the bit rate of this client signal thus, speed is adjusted the step of the bit rate of described multiple client signal pellucidly in the bit rate scope that can hold in described digital frame; With
    Adopt described frame synchronization mode to differentiate the zone of described false pattern, delete described false pattern, speed is reduced into the step of the bit rate of original client signal.
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Publication number Priority date Publication date Assignee Title
KR101243759B1 (en) 2008-12-08 2013-03-13 한국전자통신연구원 Virtual lane identification method and apparatus for applying virtual lane scheme to optical transport network
JP5356865B2 (en) * 2009-03-04 2013-12-04 富士通株式会社 Optical transmission apparatus and optical transmission method
JP5068387B2 (en) * 2009-04-13 2012-11-07 三菱電機株式会社 Optical transmission / reception system, optical transmission / reception apparatus, and optical transmission / reception method
JP5471237B2 (en) * 2009-09-25 2014-04-16 富士通株式会社 Method and circuit for transferring clock and frame
JP5560833B2 (en) * 2010-03-29 2014-07-30 富士通株式会社 Optical interface device and input frequency deviation abnormality monitoring method
JP5498290B2 (en) * 2010-07-16 2014-05-21 富士通株式会社 Frame signal generation method and apparatus
CN103891222B (en) * 2011-10-20 2017-06-27 瑞典爱立信有限公司 To the adjusted size of method and device of existing business stream in optical transport network
JP5300956B2 (en) * 2011-11-07 2013-09-25 日本電信電話株式会社 Client signal accommodating multiplexing apparatus and method
JP5300955B2 (en) * 2011-11-07 2013-09-25 日本電信電話株式会社 Client signal accommodating multiplexing apparatus and method
JP5300954B2 (en) * 2011-11-07 2013-09-25 日本電信電話株式会社 Client signal accommodating multiplexing apparatus and method
JP6114464B2 (en) * 2014-03-20 2017-04-12 日本電信電話株式会社 Transmission apparatus and transmission method
CN106301678B (en) 2015-06-08 2020-02-14 华为技术有限公司 Data processing method, communication equipment and communication system
JPWO2020203352A1 (en) * 2019-03-29 2020-10-08
JP7046993B2 (en) * 2020-01-06 2022-04-04 アンリツ株式会社 Error rate measurement system and error rate measurement method
CN117200880A (en) * 2022-05-30 2023-12-08 中国移动通信有限公司研究院 Rate adjustment method, device, equipment and storage medium
CN115037965B (en) * 2022-06-10 2024-01-19 苏州华兴源创科技股份有限公司 Multichannel data transmission method and device based on occupation coordination mechanism

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3480444B2 (en) * 2000-12-26 2003-12-22 日本電気株式会社 GFP frame transfer device and GFP frame transfer method
JP3609728B2 (en) * 2001-01-22 2005-01-12 日本電信電話株式会社 Transmission equipment
JP3586204B2 (en) * 2001-02-19 2004-11-10 日本電信電話株式会社 Multiplexed repeater transmission equipment
JP3690516B2 (en) * 2001-12-18 2005-08-31 日本電気株式会社 Multiplex transmission method, apparatus, and system
EP1756989B1 (en) * 2004-06-16 2013-05-22 Infinera Corporation Universal digital architecture for transport of client signals of any client payload and format type

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