CN101163148A - Ethernet transmission method of supporting non-standard velocity and corresponding device and access equipment - Google Patents
Ethernet transmission method of supporting non-standard velocity and corresponding device and access equipment Download PDFInfo
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Abstract
The invention discloses an Ethernet transmission method. The origin terminal and the opposite terminal allocate the corresponding medium access control layer transmission rate according to the physical layer transmission rate after confirming the physical layer transmission rate through auto-negotiation. The physical layer transmission rate carries out the physical layer data transmission, and the medium access control layer transmission rate implements the medium access control layer data transmission. The invention also discloses a device for medium access control layer, which comprises the prior constitute units and an adaptation unit for medium access control reference clock rate corresponding to the transmission rate and coding mode which are connected with the physical layer device. So the constitute units can be worked in the reference clock frequency of the medium access control layer. In addition, the device for medium access control layer also comprises the corresponding Ethernet access equipment for supporting nonstandard rate, which comprises the medium access control layer device. The technical proposal of the invention not only meets market demand of various Ethernet access distance because of the performance of supporting nonstandard rate, but also is easy to come true because of low cost.
Description
Related application
The related application of present patent application has: the 200510073307.5th Chinese patent application " method of Ethernet rate consulation and ethernet access network " that proposes on May 31st, 2005, and No. 200610078509.3 Chinese patent application " implementation method of ethernet physical layer low speed transmissions and the network equipment of application thereof " that proposes on May 8th, 2006.
Technical field
The present invention relates to network field, relate in particular to the Ethernet field; More particularly, the present invention relates to support the Ethernet transmission method of non-standard rate, and the realization of corresponding media access control layer (MAC, Medium Access Control layer) device and Ethernet access device.
Background technology
Along with the development of Ethernet at broadband access market, the non-standard rate transmission technology of physical layer (PHY, Physical layer) has appearred in Ethernet.Detailed content about the non-standard rate transmission technology of physical layer, please refer to inventor's Chinese patent application 200610078509.3 " implementation method of ethernet physical layer low speed transmissions and the network equipment of application thereof " formerly: the non-standard mode of operation by next the page information coding load bearing equipment port that utilizes in the auto-negotiation technology is supported, realize the nonstandardized technique of ethernet physical layer transmission rate.
And, in above-mentioned patent application formerly: by the coupling buffer of between physical layer and media access control layer, advancing the speed, utilize the clock frequency of these rate-matched buffer both sides to change and change physical layer transmission speed, to receive the inconsistent burst that brings between media access control layer transmission rate by off-gauge physical layer transmission speed and existing standard, realized the Ethernet transmission of non-standard rate, make same bandwidth can expand different access distances, thereby can satisfy the user's request of Ethernet more neatly at broadband access market.But owing to introduced the rate-matched buffer, to some degree, the technical scheme of this patent application formerly realizes that cost is higher.
Summary of the invention
Realize the higher deficiency of cost at above-mentioned in the first to file technical scheme, the object of the invention is, a kind of Ethernet transmission method of supporting non-standard rate is provided, and it can realize the transmission of Ethernet non-standard rate with lower cost.
Another purpose of the present invention is, a kind of media access control layer device of supporting non-standard rate is provided, and it can the off-gauge physical layer transmission speed of Adaptive matching; And include this media access control layer device, support the Ethernet access device of non-standard rate.
In order to reach the invention described above purpose, the invention provides a kind of Ethernet transmission method of supporting non-standard rate, it includes following steps:
Step 1, the physical layer rate auto-negotiation is carried out in local terminal and coupled opposite end, determines physical layer transmission speed;
Step 2 is according to this physical layer transmission rate calculations media access control layer transmission rate, from the reference clock of adaptive local terminal media access control layer device;
Step 3 for the transmission data of local terminal, is carried out the data I/O of physical layer with this physical layer transmission speed, carries out the data input/input of media access control layer with this media access control layer transmission rate.
Preferably, carry out the physical layer rate auto-negotiation described in the above-mentioned steps 1, it specifically includes following steps:
Step 1-1 sets the mode of operation that the local terminal physical layer device is supported;
Step 1-2, the mode of operation of supporting by next page information coding carrying local terminal physical layer device of quick connection pulse;
Step 1-3 sends described quick connection pulse to the opposite end;
Step 1-4 determines described physical layer transmission speed according to the response message of opposite end.
Preferably, from the reference clock of adaptive local terminal media access control layer device, it specifically includes following steps described in the above-mentioned steps 2:
Step 2-1 reads the physical layer transmission speed of local terminal physical layer device, and the code encoding/decoding mode that adopts of this physical layer device;
Step 2-2 according to above-mentioned physical layer transmission speed and code encoding/decoding mode, calculates described media access control layer transmission rate;
Step 2-3, according to this media access control layer transmission rate, the reference clock of configuration local terminal media access control layer device.
Preferably, the reference clock of the local terminal of configuration described in above-mentioned steps 2-3 medium access control function module, it specifically includes following steps:
Step 2-3-1 according to default reference clock and the relation of the multiple between this media access control layer transmission rate, determines frequency multiplication/Frequency Dividing Factor;
Step 2-3-2 utilizes this frequency multiplication/Frequency Dividing Factor that described reference clock is carried out frequency multiplication/frequency division, configures the reference clock of described media access control layer device.
In order to reach another purpose of the invention described above, the invention provides a kind of media access control layer device of supporting non-standard rate; This media access control layer device includes outside existing known each component units, also includes Rate Adapter Unit;
This Rate Adapter Unit, respectively with this media access control layer device in MDIO (Management Data Input/Output, management data I/O) interface control unit link to each other with the reference clock generator;
This Rate Adapter Unit by described MDIO interface control unit, reads the physical layer transmission speed and the code encoding/decoding mode of the physical layer device of this media access control layer device butt joint; And after calculating the media access control layer transmission rate according to this physical layer transmission speed and code encoding/decoding mode, this media access control layer transmission rate is sent to described reference clock generator, makes this reference clock generator configure the reference clock of this media access control layer device according to this media access control layer transmission rate; At this point, each component units in this media access control layer device, with the described reference clock frequency of non-standard physical layer transmission rate adapted on work.
For the media access control layer device of above-mentioned support non-standard rate, preferably, wherein said reference clock generator includes the clock calculation device, reference clock generator, and frequency multiplication/frequency divider; Wherein,
Described clock calculation device, respectively with described reference clock generator, frequency multiplication/frequency divider, and described Rate Adapter Unit links to each other; Be used for media access control layer transmission rate, determine from reference clock, to produce the required frequency multiplication/Frequency Dividing Factor of reference clock of this media access control layer device according to described Rate Adapter Unit output;
Described reference clock generator links to each other with described frequency multiplication/frequency divider with described clock calculation device respectively, is used to produce described reference clock, and sends it to described frequency multiplication/frequency divider;
Described frequency multiplication/frequency divider, respectively with described clock calculation device, described reference clock generator, and each component units links to each other in this media access control layer device; Be used for according to described frequency multiplication/Frequency Dividing Factor, described reference clock is carried out after frequency multiplication/frequency division obtains the reference clock of this media access control layer device, this reference clock is sent to described each component units respectively, described each component units all is operated on this reference clock frequency.
In addition, the present invention also provides a kind of Ethernet access device of supporting non-standard rate, includes physical layer device and media access control layer device; The media access control layer device that wherein said media access control layer device is above-mentioned support non-standard rate, it includes outside existing known each component units, also includes Rate Adapter Unit: this Rate Adapter Unit respectively with described media access control layer device in the MDIO interface control unit link to each other with the reference clock generator; This Rate Adapter Unit reads the physical layer transmission speed and the code encoding/decoding mode of described physical layer device by described MDIO interface control unit; And after calculating corresponding media access control layer transmission rate according to described physical layer transmission speed and code encoding/decoding mode, this media access control layer transmission rate is sent to reference clock generator in the described media access control layer device, makes it configure the reference clock of this media access control layer device according to this media access control layer transmission rate.
Preferably, for the Ethernet access device of above-mentioned support non-standard rate, the reference clock generator in the described media access control layer device includes the clock calculation device, reference clock generator, and frequency multiplication/frequency divider; Wherein,
Described clock calculation device, respectively with described reference clock generator, frequency multiplication/frequency divider, and described Rate Adapter Unit links to each other; Be used for media access control layer transmission rate, determine from reference clock, to produce the required frequency multiplication/Frequency Dividing Factor of reference clock of this media access control layer device according to described Rate Adapter Unit output;
Described reference clock generator links to each other with described frequency multiplication/frequency divider with described clock calculation device respectively, is used to produce reference clock, and sends it to described frequency multiplication/frequency divider;
Described frequency multiplication/frequency divider, respectively with described clock calculation device, described reference clock generator, and each component units links to each other in this media access control layer device; Be used for according to described frequency multiplication/Frequency Dividing Factor, described reference clock is carried out after frequency multiplication/frequency division obtains the reference clock of this media access control layer device, this reference clock is sent to each component units in this media access control layer device respectively, makes that each component units all is operated on this reference clock frequency in this media access control layer device.
Preferably, for the Ethernet access device of above-mentioned support non-standard rate, described physical layer device includes existing known each component units, and clock generator wherein is non-standard clock generator; This non-standard clock generator links to each other with each component units in this physical layer device, is used to export non-standard clock, makes that each component units all is operated on this non-standard clock frequency in this physical layer device.
Preferably, for the Ethernet access device of above-mentioned support non-standard rate, described physical layer device also includes rate register; This rate register links to each other with MDIO interface control unit in the described media access control layer device, is used to store the mode of operation of described physical layer device support and the mode of operation of using, and reads for described MDIO interface control unit.
Preferably, Ethernet access device for above-mentioned support non-standard rate, described physical layer device also includes the rate consulation unit, and this rate consulation unit links to each other with signal conversion unit, rate register and non-standard clock generator in the described physical layer device respectively; The mode of operation that this rate consulation unit is supported according to this physical layer device in the described rate register, undertaken after auto-negotiation determines the mode of operation of this physical layer device by described signal conversion unit and the opposite end of docking this Ethernet access device, determined mode of operation is fed back to described rate register, and control the non-standard clock frequency of described non-standard clock generator output according to this mode of operation.
The media access control layer device of support non-standard rate provided by the invention, the non-standard transmission rate of the physical layer device that can Adaptive matching docks with it; Thereby make, the media access control layer device of using this support non-standard rate carries out the transmission of non-standard rate Ethernet data, compare the technical scheme in the inventor's the Chinese patent application formerly 200610078509.3 " implementation method of ethernet physical layer low speed transmissions and the network equipment of application thereof ", saved the rate-matched buffer.That is to say that technical scheme provided by the invention is not only supported non-standard rate because of it and can be satisfied the user's request of various access distances in the Ethernet broadband access market flexibly, and because of the low easier realization of its cost.
Description of drawings
Fig. 1: the present invention supports the flow chart of the Ethernet transmission method of non-standard rate
Fig. 2: existing known media access control layer schematic representation of apparatus
Fig. 3: the present invention supports the media access control layer schematic representation of apparatus of non-standard rate
Fig. 4: the present invention supports the schematic diagram of reference clock generator in the media access control layer device of non-standard rate
Fig. 5: the present invention supports the preferred structure schematic diagram of the Ethernet access device of non-standard rate
Embodiment
As shown in Figure 1, a kind of Ethernet transmission method of supporting non-standard rate provided by the invention includes the following step:
Step 1, the physical layer rate auto-negotiation is carried out in local terminal and coupled opposite end, determines physical layer transmission speed;
Step 2 is according to this physical layer transmission rate calculations media access control layer transmission rate, from the reference clock of adaptive local terminal media access control layer device;
Step 3 for the transmission data of local terminal, is carried out the data I/O of physical layer with this physical layer transmission speed, carries out the data input/input of media access control layer with this media access control layer transmission rate.
Wherein, as shown in Figure 1, described step 1 " auto-negotiation PHY speed ": the physical layer rate auto-negotiation is carried out in local terminal and coupled opposite end, determines physical layer transmission speed; Its concrete operation of carrying out is not quite similar with existing current Ethernet auto-negotiation, and especially wherein step 1-2 relates to next the page information coding in the auto-negotiation technology; But since the inventor formerly Chinese patent application 200610078509.3 " implementation method of ethernet physical layer low speed transmissions and the network equipment of application thereof " ins and outs of this step are disclosed in detail, so do not repeat them here.
And as shown in Figure 1, the above-mentioned steps 2 concrete operations of carrying out have:
Step 2-1 reads the physical layer transmission speed of local terminal physical layer device, and the code encoding/decoding mode that adopts of this physical layer device;
This step this physical layer device of action need increases corresponding rate register; Local terminal media access control layer device, by the control channel between itself and the local terminal physical layer device, such as MDIO (Management Data Input/Output, the management data I/O) control interface unit, read this rate register, just can obtain the physical layer transmission speed of this physical layer device;
Step 2-2 according to above-mentioned physical layer transmission speed and code encoding/decoding mode, calculates described media access control layer transmission rate;
This step operation is essentially rate transition, the code encoding/decoding mode that need adopt according to described physical layer device, and such as 4b/5b, or 8b/10b, even 64b/66b is corresponding media access control layer transmission rate with described physical layer transmission rate transition;
Step 2-3, according to this media access control layer transmission rate, the reference clock of configuration local terminal media access control layer device;
And as shown in Figure 1, this step 2-3 also can further be divided into and include following substep:
Step 2-3-1 according to default reference clock and the relation of the multiple between this media access control layer transmission rate, determines frequency multiplication/Frequency Dividing Factor;
Step 2-3-2 utilizes this frequency multiplication/Frequency Dividing Factor that described reference clock is carried out frequency multiplication/frequency division, configures the reference clock of described media access control layer device;
Wherein, the basic principle of preset reference clock is: the reference clock that contrasts each optional reference clock and required generation, select to become the reference clock of multiple relation with this reference clock as far as possible, make that corresponding frequency multiplication/Frequency Dividing Factor is simple relatively, and then make it possible to relatively easily from described reference clock, produce required reference clock.
Further explain above-mentioned reference clock generator below in conjunction with several data instances, such as: the ethernet network device of existing support standard 10Mbps/100Mbps speed generally uses the reference clock of 25Mhz, utilize the reference clock of this 25Mhz can produce the reference clock of 10Mhz (25Mhz * 2/5), wherein frequency multiplication/Frequency Dividing Factor equals 2/5; Also can produce the reference clock of 125Mhz (25Mhz * 5), wherein frequency multiplication/Frequency Dividing Factor equals 5.
And, when the physical layer transmission speed of the adaptive physical layer device that docks with it of media access control layer device, as mentioned above, not only to consider this physical layer transmission speed, also to consider the code encoding/decoding mode that this physical layer device adopts.Such as: when physical layer transmission speed is 20Mbps and employing 4b/5b code encoding/decoding mode, corresponding media access control layer transmission rate is 16Mbps, at this moment then recommend to use the reference clock of 8Khz (16Mhz=8Khz * 20) or 2Mhz (16Mhz=2Mhz * 8) to produce the reference clock of corresponding media access control layer device, but do not recommend to use the reference clock of 25Mhz; And when physical layer transmission speed be 30Mbps and when adopting the 4b/5b code encoding/decoding mode equally, corresponding media access control layer transmission rate is 24Mbps, at this moment then still recommend to use the reference clock of 8Khz (24Mhz=8Khz * 30) or 2Mhz (24Mhz=2Mhz * 12) to produce the reference clock of corresponding media access control layer device, and still do not recommend to utilize the reference clock of 25Mhz.
By top introduction, those skilled in the art should be able to learn in conjunction with shown in Figure 1, the Ethernet transmission method of this support non-standard rate is step 2 " from adaptive MAC clock " with the main distinction of existing current Ethernet transmission method: the physical layer transmission rate calculations media access control layer transmission rate of determining according to auto-negotiation, and dispose the reference clock of corresponding media access control layer device; And with regard to technical solution of the present invention, wherein said physical layer transmission speed is the non-standard rate such as 2Mbps/4Mbps/6Mbps/8Mbps/20Mbps/30Mbps/50Mbps.
Simultaneously, the invention provides a kind of media access control layer device of supporting non-standard rate, this media access control layer device can the off-gauge physical layer transmission speed of Adaptive matching; Below in conjunction with Fig. 2 and Fig. 3, introduce this media access control layer device improvement place compared to existing technology in detail.
As shown in Figure 2, existing known media access control layer device (100) has generally comprised following component units: MDIO (Management Data Input/Output, the management data I/O) control interface unit (210), one of its function are to dispose the interface that it docks with physical layer device for described media access control layer device (100); CPU (Center Process Unit, central processing unit) interface unit (220), be used to carry out the interface function between CPU and the media access control layer, comprise provide configuration (Configuration), control (Control), and the statistics information such as (Statistics); Reconciliation sublayer (RS, Reconciliation Sublayer) (250), media access control layer device (100) is connected to Media Independent Interface (MII, Media Independent Interface) via this reconciliation sublayer (250); Applied business interface (Application Interface) unit (290), media access control layer device (100) is connected to network layer via this applied business interface unit (290); Be used between described reconciliation sublayer (250) and described applied business interface unit (290), carrying out the access control unit (260) of transfer of data, logic link layer control unit (270), data forwarding unit (280) etc.; And reference clock generator (230), be used to above-mentioned each component units (250,260,270,280,290 etc.) that working clock frequency is provided.
Yet, as shown in Figure 3, the media access control layer device (200) of support non-standard rate provided by the invention except that including above-mentioned existing known component units (210,220,230,250,260,270,280,290 etc.), also includes Rate Adapter Unit (240).This Rate Adapter Unit (240), respectively with this media access control layer device (200) in cpu i/f unit (220) link to each other with reference clock generator (230); This Rate Adapter Unit (240) reads the physical layer transmission speed and the code encoding/decoding mode of the physical layer device that docks with this media access control layer device (200) by described MDIO control interface unit (210); And after calculating the media access control layer transmission rate according to this physical layer transmission speed and code encoding/decoding mode, this media access control layer transmission rate is sent to described reference clock generator (230), makes it configure the reference clock of this media access control layer device (200) according to this media access control layer transmission rate; At this point, each component units in this media access control layer device (200) (250,260,270,280,290 etc.), with the described reference clock frequency of non-standard physical layer transmission rate adapted on work.
And this Rate Adapter Unit (240) can adopt example, in hardware to realize, such as increase a calculator between described cpu i/f unit (220) and described reference clock generator (230); Also can adopt form of software to realize, such as, a computing module in described cpu i/f unit (220), increased; No matter adopt which kind of implementation, its final purpose all is to guarantee that from hardware this media access control layer device (200) can support off-gauge transmission rate.
Therefore, in order to make described media access control layer device support non-standard rate, at first need to know the physical layer transmission speed of this media access control layer device (200) needs support, and, dispose the reference clock of reference clock generator (230) in this media access control layer device (200) accordingly in conjunction with the code encoding/decoding mode that the physical layer device that docks with it adopts.
In addition, consider that having the media access control layer device now only supports standard speed mostly, that is to say that the reference clock of existing media access control layer device is generally the reference clock of standard; Reference clock generator for standard in the compatible prior art well, and realize the generation of continuous non-standard reference clock, reference clock generator (230) described in the media access control layer device (200) of support non-standard rate provided by the invention also can preferably include clock calculator (231), reference clock generator (232) as shown in Figure 4, reach frequency multiplication/frequency divider (233).
Wherein, clock calculation device shown in Figure 4 (231), respectively with reference clock generator (232), frequency multiplication/frequency divider (233), and the Rate Adapter Unit (240) of this reference clock generator (230) media access control layer device of living in (200) links to each other; Be used for media access control layer transmission rate, be identified for from reference clock, producing the required frequency multiplication/Frequency Dividing Factor of this media access control layer device (200) reference clock according to this Rate Adapter Unit (240) output;
Reference clock generator shown in Figure 4 (232) links to each other with frequency multiplication/frequency divider (233) with clock calculation device (231) respectively; Be used to produce described reference clock, and send it to this frequency multiplication/frequency divider (233);
Frequency multiplication/frequency divider shown in Figure 4 (233), respectively with clock calculation device (231), reference clock generator (232), and each component units (250,260,270,280,290 etc.) links to each other in this reference clock generator (230) media access control layer device of living in (200); Be used for the frequency multiplication/Frequency Dividing Factor definite according to this clock calculation device (231), the reference clock that this reference clock generator (232) is exported carries out frequency multiplication/frequency division, obtains the reference clock of this media access control layer device (200); And this reference clock is sent to each component units (250,260,270,280,290 etc.) of this media access control layer device (200) respectively, these component units (250,260,270,280,290 etc.) are operated on this reference clock frequency.
The present invention also provides a kind of Ethernet access device of supporting non-standard rate, and Fig. 5 shows the preferred structure schematic diagram of this Ethernet access device (500).As can be seen from Figure 5, the Ethernet access device (500) of this support non-standard rate includes physical layer device (300) and media access control layer device (200), both are by Media Independent Interface (Medium IndependentInterface, MII) (400) interconnection.
And the device of media access control layer shown in Fig. 5 (200) is the media access control layer device of above-mentioned support non-standard rate, and its structural representation please see Fig. 3 for details.
Simultaneously, physical layer device shown in Fig. 5 (300) includes and has common known signal converting unit (360), transmission coding/decoding unit (370), scrambler unit (380), codec unit (390) now, reaches each component units such as clock generator, and this clock generator is non-standard clock generator (310); This non-standard clock generator (310) links to each other with above-mentioned each component units (360,370,380,390), is used to export off-gauge clock, and described each component units (360,370,380,390) all is operated on this off-gauge clock frequency; Because this non-standard clock generator (310) can produce off-gauge clock, make this physical layer device (300) can support off-gauge transmission rate, but when be non-standard rate such as 2Mbps/4Mbps/6Mbps/8Mbps/20Mbps/30Mbps/50Mbps, need utilize next page information in the Ethernet auto-negotiation technology to encode by the transmission rate that auto-negotiation is set physical layer device (300); About described next page information coding, in first to file 200610078509.3 " implementation method of ethernet physical layer low speed transmissions and the network equipment of application thereof " ins and outs of this step are disclosed in detail with the aforementioned because inventor, so also repeat no more at this.
In addition, this physical layer device (200) also includes rate register (320) and rate consulation unit (330): this rate register (320) links to each other with MDIO interface control unit (210) in the described media access control layer device (200) by described Media Independent Interface (400), be used to store the mode of operation of described physical layer device (300) support and the mode of operation of using, and read for described MDIO interface control unit (210); This rate consulation unit (330) links to each other with signal conversion unit (360), rate register (320) and the non-standard clock generator (310) of (300) in the described physical layer device respectively; This rate consulation unit (330) is according to the mode of operation of depositing in the described rate register (320), this physical layer device (300) is supported, undertaken after auto-negotiation determines the mode of operation of described physical layer device (300) by described signal conversion unit (360) and the opposite end of docking this Ethernet access device (500), determined mode of operation is fed back to described rate register (320), and control the non-standard clock frequency of described non-standard clock generator (310) output according to this mode of operation.
Can learn by above introduction: the physical layer device (300) in the Ethernet access device shown in Figure 5 (500) can be supported the physical layer transmission speed of non-standard rate by utilizing next the page information coding in the Ethernet auto-negotiation technology; And the media access control layer device (200) in the Ethernet access device shown in Figure 5 (500), because of increase has the non-standard physical layer transmission speed that Rate Adapter Unit can the described physical layer device of Adaptive matching (300); Thereby make and use the Ethernet access device that this supports non-standard rate, the Ethernet transmission method of the support non-standard rate that the invention described above provides can be implemented relatively simply, and then the user's request of various access distances in the Ethernet broadband access market can be satisfied flexibly with lower cost.
What need statement is that foregoing invention content and embodiment are intended to prove the practical application of technical scheme provided by the present invention, should not be construed as the qualification to protection range of the present invention.Those skilled in the art are in spirit of the present invention and principle, when doing various modifications, being equal to and replacing or improve.Protection scope of the present invention is as the criterion with appended claims.
Claims (11)
1. an Ethernet transmission method of supporting non-standard rate is characterized in that, includes following steps:
Step 1, the physical layer rate auto-negotiation is carried out in local terminal and coupled opposite end, determines physical layer transmission speed;
Step 2, according to this physical layer transmission rate calculations media access control layer transmission rate, and from the reference clock of adaptive local terminal media access control layer device;
Step 3 for the transmission data of local terminal, is carried out the data I/O of physical layer with this physical layer transmission speed, carries out the data I/O of media access control layer with this media access control layer transmission rate.
2. the Ethernet transmission method of support non-standard rate as claimed in claim 1 is characterized in that, described step 1 is specially:
Step 1-1 sets the mode of operation that the local terminal physical layer device is supported;
Step 1-2, the mode of operation of supporting by next page information coding carrying local terminal physical layer device of quick connection pulse;
Step 1-3 sends described quick connection pulse to the opposite end;
Step 1-4 determines described physical layer transmission speed according to the response message of opposite end.
3. the Ethernet transmission method of support non-standard rate as claimed in claim 1 is characterized in that, described step 2 is specially:
Step 2-1 reads the physical layer transmission speed of local terminal physical layer device, and the code encoding/decoding mode that adopts of this physical layer device;
Step 2-2 according to above-mentioned physical layer transmission speed and code encoding/decoding mode, calculates described media access control layer transmission rate;
Step 2-3, according to this media access control layer transmission rate, the reference clock of configuration local terminal media access control layer device.
4. the Ethernet transmission method of support non-standard rate as claimed in claim 3 is characterized in that, described step 2-3 is specially:
Step 2-3-1 according to default reference clock and the relation of the multiple between this media access control layer transmission rate, determines frequency multiplication/Frequency Dividing Factor;
Step 2-3-2 carries out frequency multiplication/frequency division according to this frequency multiplication/Frequency Dividing Factor to described reference clock, configures the reference clock of described media access control layer device.
5. a media access control layer device of supporting non-standard rate includes MDIO interface control unit and reference clock generator;
It is characterized in that this medium access control apparatus also includes Rate Adapter Unit, this Rate Adapter Unit links to each other with described reference clock generator with described MDIO interface control unit respectively;
This Rate Adapter Unit reads the physical layer transmission speed and the code encoding/decoding mode of the physical layer device that docks with this media access control layer device by described MDIO interface control unit; And after calculating corresponding media access control layer transmission rate according to described physical layer transmission speed and code encoding/decoding mode, this media access control layer transmission rate is sent to described reference clock generator; Make this reference clock generator according to this media access control layer transmission rate, configure the reference clock of this media access control layer device.
6. the media access control layer device of support non-standard rate as claimed in claim 5 is characterized in that, described reference clock generator includes the clock calculation device, reference clock generator, and frequency multiplication/frequency divider; Wherein,
Described clock calculation device, respectively with described reference clock generator, frequency multiplication/frequency divider, and described Rate Adapter Unit links to each other; Be used for media access control layer transmission rate, determine from reference clock, to produce the required frequency multiplication/Frequency Dividing Factor of reference clock of this media access control layer device according to described Rate Adapter Unit output;
Described reference clock generator links to each other with described frequency multiplication/frequency divider with described clock calculation device respectively, is used to produce described reference clock, and sends it to described frequency multiplication/frequency divider;
Described frequency multiplication/frequency divider, respectively with described clock calculation device, described reference clock generator, and each component units links to each other in this media access control layer device; Be used for according to described frequency multiplication/Frequency Dividing Factor, described reference clock is carried out after frequency multiplication/frequency division obtains the reference clock of this media access control layer device, this reference clock is sent to described each component units respectively, described each component units all is operated on this reference clock frequency.
7. an Ethernet access device of supporting non-standard rate includes physical layer device and media access control layer device; It is characterized in that:
Described media access control layer device includes Rate Adapter Unit, this Rate Adapter Unit respectively with described media access control layer device in the MDIO interface control unit link to each other with the reference clock generator;
This Rate Adapter Unit reads the physical layer transmission speed and the code encoding/decoding mode of described physical layer device by described MDIO interface control unit; And after calculating corresponding media access control layer transmission rate according to described physical layer transmission speed and code encoding/decoding mode, this media access control layer transmission rate is sent to reference clock generator in the described media access control layer device, makes this reference clock generator configure the reference clock of this media access control layer device according to this media access control layer transmission rate.
8. the Ethernet access device of support non-standard rate as claimed in claim 7 is characterized in that, the reference clock generator in the described media access control layer device includes the clock calculation device, reference clock generator, and frequency multiplication/frequency divider; Wherein,
Described clock calculation device, respectively with described reference clock generator, frequency multiplication/frequency divider, and described Rate Adapter Unit links to each other; Be used for media access control layer transmission rate, determine from reference clock, to produce the required frequency multiplication/Frequency Dividing Factor of reference clock of this media access control layer device according to described Rate Adapter Unit output;
Described reference clock generator links to each other with described frequency multiplication/frequency divider with described clock calculation device respectively, is used to produce described reference clock, and sends it to described frequency multiplication/frequency divider;
Described frequency multiplication/frequency divider, respectively with described clock calculation device, described reference clock generator, and each component units links to each other in this media access control layer device; Be used for according to described frequency multiplication/Frequency Dividing Factor, described reference clock is carried out after frequency multiplication/frequency division obtains the reference clock of this media access control layer device, this reference clock is sent to each component units in this media access control layer device respectively, makes that each component units all is operated on this reference clock frequency in this media access control layer device.
9. as the Ethernet access device of claim 7 or 8 described support non-standard rates, it is characterized in that the clock generator in the described physical layer device is non-standard clock generator;
This non-standard clock generator links to each other with each component units in the described physical layer device, is used to export non-standard clock, makes that each component units all is operated on this non-standard clock frequency in the described physical layer device.
10. the Ethernet access device of support non-standard rate as claimed in claim 9 is characterized in that described physical layer device also includes rate register;
This rate register links to each other with MDIO interface control unit in the described media access control layer device, is used to store the mode of operation of described physical layer device support and the mode of operation of using, and reads for described MDIO interface control unit.
11. the Ethernet access device of support non-standard rate as claimed in claim 10 is characterized in that described physical layer device also includes the rate consulation unit;
This rate consulation unit links to each other with signal conversion unit, rate register and non-standard clock generator in the described physical layer device respectively;
The mode of operation that this rate consulation unit is supported according to this physical layer device in the described rate register, undertaken after auto-negotiation determines the mode of operation of this physical layer device by described signal conversion unit and the opposite end of docking this Ethernet access device, determined mode of operation is fed back to described rate register, and control the non-standard clock frequency of described non-standard clock generator output according to this mode of operation.
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| FI955944A (en) * | 1995-12-11 | 1997-06-12 | Nokia Telecommunications Oy | Data rate matching procedure and data rate matching unit |
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