CN101494594B

CN101494594B - Transmission control method, coaxial line terminal and optical network unit

Info

Publication number: CN101494594B
Application number: CN2008100565976A
Authority: CN
Inventors: 于洋
Original assignee: Hangzhou H3C Technologies Co Ltd
Current assignee: New H3C Technologies Co Ltd
Priority date: 2008-01-22
Filing date: 2008-01-22
Publication date: 2011-05-04
Anticipated expiration: 2028-01-22
Also published as: CN101494594A

Abstract

The invention discloses a transmission control method, a CLT and an ONU, which are applied to a cascade CLT system taking the ONU as an uplink interface card. The method comprises the following steps: the ONU distributes logical links for each CLT connected with the ONU; each CLT sends the information of a service packet to be sent to the ONU; the ONU determines the receivable service packets of each logical link corresponding to each CLT according to the information of the service packet to be sent which is sent by each CLT and distributable uplink bandwidth of the ONU; and each logical link transfers the service packet which can be transmitted of the link from the CLT to the ONU during the data uploading stage, and transmits the service packet. The invention reduces the storage design cost of the cascade CLT system.

Description

Transfer control method, coaxial line terminal and optical network unit

Technical field

The present invention relates to technical field of data transmission, be specifically related to using optical network unit (ONU, Optical Network Unit) as the transfer control method in cascade coaxial line terminal (CLT, the CoaxialLine Terminal) system of upstream Interface card and use ONU as the CLT in the cascade CLT system of upstream Interface card, as the ONU of the upstream Interface card of cascade CLT system.

Background technology

At present, need to use Ethernet passive optical network (EPON under a lot of situations in market, EthernetPassive Optical Network) ONU in the system is as the upstream Interface card of the CLT in Ethernet passive coaxial network (EPCN, the Ethernet Passive Coaxial Network) system.

When a plurality of CLT cascades, when forming cascade EPCN system, the CLT of a plurality of cascades uses an ONU as the upstream Interface card.Fig. 1 has provided the schematic diagram of ONU of existing use as the cascade CLT system of upstream Interface card, as shown in Figure 1, n CLT is after cascade, by gigabit Ethernet (GE, Gigabit Ethernet) interface links to each other with an ONU as the upstream Interface card, wherein, coaxial network unit (CNU, Coaxial Network Unit) inserts CLT by user interface, ONU is by LLID (LLID, Logic Link Identification) interface and optical line terminal (OLT, Optical Line Terminal) link to each other, and n is the integer more than or equal to 1.

As shown in Figure 1, CLT1 directly links to each other with ONU, and other CLT links to each other with ONU indirectly by CLT1.Each CLT receives the business packet that other CLT sends by the business packet of user interface reception from CNU by subtending port.

Each CLT comprises the first queue management unit and the second queue scheduling unit.The first queue management unit is used for will putting into the first order upstream queue of the memory of this CLT from the business packet of user's interface according to default scheduling strategy.The second queue management unit, be used for according to default scheduling strategy, to from the first order upstream queue of this CLT with from the business packet of other CLT, put into the second level upstream queue of the memory of this CLT, and when the GE interface is idle, from the upstream queue of the second level, takes out business packet and send.

ONU receives the uplink service bag that CLT1 sends, and the queue management unit is put into the upstream queue of the memory of this ONU with business packet, and when the LLID interface is idle, business packet sent according to default scheduling strategy.

ONU need realize the large-capacity data buffer storage.This be because, in the EPON system, an ascending physical signal passage is shared in a plurality of ONU timesharing, therefore, from the downlink port of ONU promptly: the upstream data of GE port need be waited in line in ONU inside or outside, and the total flow of downlink port is generally all greater than uplink port promptly: but the dispense flow rate of LLID interface, and so ONU need realize large-capacity data buffering, with buffering with handle these flow moment.

In GE EPON system, OLT port can 32 ONU of following extension, and the uplink port flow that each ONU average mark gets is about 1000Mbps/32=30Mbps; And the descending Fast Ethernet of conventional ONU (FE, Fast Ethernet) port number is 4, and promptly the total flow of downlink port is 400Mbps.Therefore, the business that may have a 400Mbps flow enters ONU from downlink port moment, and at this moment, ONU needs this 400Mbps flow of jumbo memory buffer, this flow after queuing is handled, with lower physical rate as: 30Mbps sends from uplink port.

Because CLT itself has powerful traffic management (TM, Traffic Management) ability, and the ONU of standard itself also needs very strong TM ability, like this, CLT and ONU need very big data buffering ability, and no matter ONU still supports jumbo memory outside the sheet in sheet, the capital causes the pin of ONU chip or door number to increase considerably, thereby increases the cost of ONU.To networking cost requirement more and more stricter today, the cost that how to reduce ONU is very crucial operator or enterprise network client.

In addition, because ONU is single LLID ONU, promptly an ONU has only a LLID.So, from the uplink service of different CLT wrap in put into different queue after, will be from high to low according to queue priority, successively by same LLID interface output.In this manner, the business packet of high priority is always preferentially sent.If the priority of the business packet of some CLT is lower, the uplink service bag of this CLT may rest in the memory always so, slowly is not forwarded, thereby has reduced the overall transfer efficient of cascade CLT system.

Summary of the invention

The invention provides transfer control method, use ONU, use the design cost of ONU as the cascade CLT system of upstream Interface card to reduce as the CLT in the cascade CLT system of upstream Interface card, as the ONU of the upstream Interface card of cascade CLT system.

Technical scheme of the present invention is achieved in that

A kind of transfer control method is applied to comprise with in the cascade CLT system of ONU as the upstream Interface card:

ONU is each coupled CLT assignment logic link;

Each CLT sends to ONU with the information of business packet to be sent;

ONU determines the received business packet of each logical links corresponding with each CLT according to the information of the described business packet to be sent of each CLT transmission and the up bandwidth of distributing of ONU;

Each logical links passes the business packet that data phase can transmit this link thereon and transfers to ONU from CLT, and transmits.

Described ONU is that each coupled CLT assignment logic link is: ONU distributes a logical links for all CLT,

Perhaps: ONU gives an above CLT with every link assignment in the partial logic link, and gives a CLT with every link assignment in the remainder logical links;

Perhaps: ONU distributes a logical links for each CLT.

Described each CLT sends to ONU with the information of business packet to be sent: with the media access control MAC address of this CLT, the first order upstream queue ID of storage business packet to be sent and the business packet number notice ONU that each formation comprises.

ONU determines that the received business packet of each logical links corresponding with each CLT further comprises: ONU sends to described CLT respectively with receivable business packet number in the first order upstream queue ID at receivable business packet place and each formation.

Described method further comprises: preestablish: the VLANID of the outer MAC head by message identifies this message and is control message or service message.

The business packet that described each logical links can be transmitted this link is transferred to ONU from CLT and is comprised:

CLT encapsulates one deck MAC head again outside traditional Ethernet service packet, and the vlanid in the MAC head identifies this bag for business packet, and business packet is sent to ONU, and, after ONU receives business packet, the outer MAC head of business packet is peeled off, then the logical links of business packet from correspondence sent.

A kind of CLT, this CLT are arranged in and use the cascade CLT system of ONU as the upstream Interface card, comprising:

Memory management unit sends to transmission control unit with business packet information to be sent; Reception can receive business packet information, takes out business packet and send to the business packet transmission unit from the memory of this CLT;

Transmission control unit, the business packet information to be sent that memory management unit is sent sends to ONU; Receive the received business packet information that ONU sends, this information is sent to memory management unit;

The business packet transmission unit, the business packet that the receiving, storing and managing unit is sent sends to ONU with business packet.

Described memory management unit comprises:

Business packet is received from user interface in the first queue management unit, and business packet is put into the first order upstream queue of this CLT, and the business packet number in first order upstream queue ID, each formation is sent to transmission control unit as business packet information to be sent; Receive the received business packet place that transmission control unit sends first order upstream queue ID, and each formation in received business packet number, from corresponding formation, take out business packet and send to the second queue management unit;

The second queue management unit receives the first queue management unit of this CLT or the business packet that other CLT sends, and business packet is put into second level upstream queue, takes out business packet and send to the business packet transmission unit from the upstream queue of the second level.

Described memory management unit is further used for, and at the skin encapsulation MAC of business packet head, and the source MAC in the MAC head is the MAC Address of this CLT.

A kind of ONU of the upstream Interface card as cascade CLT comprises:

Receive control unit, receive and preserve the business packet information to be sent that each CLT sends, receive the up bandwidth information of distributing, the information of the described business packet to be sent that sends according to this bandwidth information and each CLT, determine the received business packet of each logical links corresponding, send to CLT and can receive business packet information with each CLT;

The LLID unit, the state of monitoring LLID interface sends to the reception control unit with the up bandwidth information of distributing of this LLID interface.

Described ONU further comprises: the logical links allocation units are used to each the CLT assignment logic link that links to each other with this ONU.

Compared with prior art, the present invention is each coupled CLT assignment logic link by ONU; Each CLT sends to ONU with the information of business packet to be sent; ONU determines the received business packet of each logical links corresponding with each CLT according to the information of the described business packet to be sent of each CLT transmission and the up bandwidth of distributing of ONU; Each logical links passes the business packet that data phase can transmit this link thereon and transfers to ONU from CLT, and transmits, and makes ONU need not bigger memory space, has reduced the storage design cost of ONU; Simultaneously,, therefore, do not increase the storage design cost of CLT because CLT itself has bigger chip external memory yet, thereby, the design cost of whole use ONU reduced as the cascade CLT system of upstream Interface card.

Description of drawings

Fig. 1 is the schematic diagram of existing use ONU as the cascade CLT system of upstream Interface card;

Fig. 2 for first embodiment of the invention provide in using the cascade CLT system of ONU as the upstream Interface card, transmit the flow chart of control;

Fig. 3 for second embodiment of the invention provide in using the cascade CLT system of ONU as the upstream Interface card, transmit the flow chart of control;

Fig. 4 for first embodiment of the invention provide at the structural representation that uses ONU as the CLT in the cascade CLT system of upstream Interface card;

The structural representation that Fig. 5 provides for first embodiment of the invention as the ONU of the upstream Interface card of cascade CLT system;

The structural representation that Fig. 6 provides for second embodiment of the invention as the ONU of the upstream Interface card of cascade CLT system.

Embodiment

Among the present invention, be collectively referred to as with each CLT of cascade and as the ONU of the upstream Interface card of each CLT of this cascade: use the cascade CLT system of ONU as the upstream Interface card.

Core concept of the present invention is: ONU is each coupled CLT assignment logic link; Each CLT sends to ONU with the information of business packet to be sent; ONU determines the received business packet of each logical links corresponding with each CLT according to the information of the described business packet to be sent of each CLT transmission and the up bandwidth of distributing of ONU; Each logical links passes the business packet that data phase can transmit this link thereon and transfers to ONU from CLT, and transmits.

In actual applications, ONU can distribute a logical links (LL) for all CLT, also can distribute a logical links for each CLT, also can give an above CLT, and give a CLT every link assignment in the remainder logical links with every link assignment in the partial logic link.

The present invention is described in detail below to divide two specific embodiments.

In first embodiment, in using the cascade CLT system of ONU as the upstream Interface card, ONU is that all CLT distribute a logical links, that is: ONU is single LLID interface, and the business packet that all CLT send is all sent by this LLID interface.

In a second embodiment, in using the cascade CLT system of ONU as the upstream Interface card, ONU distributes a logical links for each CLT, that is: ONU is many LLID interface, and the corresponding CLT of each LLID interface, the business packet that each CLT sends is sent by a LLID interface respectively.

When ONU gives an above CLT with every link assignment in the partial logic link, and when giving a CLT with every link assignment in the remainder logical links, the transmission control procedures of this moment can be obtained by first, second embodiment immediate reasoning, do not repeat them here.

Fig. 2 for first embodiment of the invention provide in using the cascade CLT system of ONU as the upstream Interface card, transmit the flow chart of control, in the present embodiment, set CLT1～n cascade, and CLT1 directly links to each other by the GE interface with ONU, and as shown in Figure 2, its concrete steps are as follows:

Step 201:CLT1～n receives business packet from user interface, according to default upstream queue division rule, this business packet is put into the first order upstream queue of the memory of this CLT.

Because CLT itself has jumbo chip external memory, therefore, the memory of the CLT in this step is often referred to chip external memory.

Upstream queue can be by the user, and perhaps type of service is divided.That is: same user's business packet can be put into same formation, perhaps, the business packet of same type be put into same formation.The length of each upstream queue can be determined according to the chip external memory space of CLT.

Step 202:CLT1～n is respectively to ONU transmit queue report message, and the source MAC in this message is the MAC Address of this CLT, and the first order upstream queue of also carrying this CLT in this message identifies (ID), reaches the business packet number that comprises in each formation.

In this step, CLT1 directly sends to ONU by the GE interface with queue report message; CLT2～n sends to ONU with queue report message indirectly by CLT1.

Step 203:ONU receives the individual queue report message, preserve the CLT in the individual queue report message MAC Address, first order upstream queue ID, and each formation in the corresponding relation of between business packet number that comprises.

Step 204:ONU detects the LLID interface free time of self, according to the MAC Address of current distributed upstream bandwidth and each CLT of preserving, first order upstream queue ID, and each formation in the corresponding relation of between business packet number that comprises, determine CLTp～q (1≤p≤q≤MAC Address n), the first order upstream queue ID, and receivable business packet number in each formation at receivable business packet place.

The total bandwidth that all receivable business packet take should be not more than the up bandwidth of distributing of LLID interface.

If the priority difference of each first order upstream queue of each CLT, then ONU can select receivable first order upstream queue according to the priority of individual queue from high to low successively.Particularly, can the make an appointment corresponding relation of first order upstream queue ID and priority of each CLT and ONU, ONU selects the higher formation of priority according to this corresponding relation.

Step 205:ONU is respectively to CLTp～q transmit queue administrative messag, the target MAC (Media Access Control) address of each queue management message is the MAC Address of one of CLTp～q, this message carry simultaneously the first order upstream queue ID that can receive the business packet place, and each formation in receivable business packet number.

Step 206: queue management message arrives CLT1, and CLT1 judges whether the target MAC (Media Access Control) address in this message is the MAC Address of this CLT, if, execution in step 207; Otherwise, execution in step 208.

Step 207:CLT1 is according to first order upstream queue ID in this message and the receivable business packet number of each formation, from the first order upstream queue of this CLT, take out business packet, according to default upstream queue division rule, put into second level upstream queue, go to step 211.

Step 208:CLT1 goes out the queue management forwards according to the target MAC (Media Access Control) address in this message.

For example: if the target MAC (Media Access Control) address in the queue management message points to CLT4, then CLT1 gives CLT2 with this forwards earlier, and the target MAC (Media Access Control) address that CLT2 detects this message points to CLT4, then is transmitted to CLT3, and the rest may be inferred, arrives CLT4 up to this message.

Step 209: one of CLTp～q that described target MAC (Media Access Control) address points to receives queue management message, according to the received business packet number that comprises in the upstream queue ID in this message, each formation, from the first order upstream queue of this CLT, take out business packet, according to default upstream queue division rule, put into the second level upstream queue of this CLT, and when the subtending port of this CLT is idle, from the upstream queue of the second level, takes out business packet and send to CLT1.

CLTp～q to the detailed process that CLT1 sends business packet is: if CLTx (p≤x≤q) will send business packet to CLT1, this business packet at first arrives CLT (x-1), CLT (x-1) is according to predefined upstream queue division rule, this business packet is put into second level upstream queue, and when the subtending port of this CLT is idle, take out business packet and send to CLT (x-2) from the upstream queue of the second level, the rest may be inferred, arrives CLT1 up to business packet.

Step 210:CLT1 receives the business packet that CLTp～q (p, q ≠ 1) sends, and according to default upstream queue division rule, business packet is put into the second level upstream queue of this CLT.

Step 211:CLT1 detects the GE interface during free time, takes out business packet from the second level upstream queue of this CLT, and sends to ONU.

Step 212:ONU receives business packet, and business packet is sent by the LLID interface.

Fig. 3 for second embodiment of the invention provide in using the cascade CLT system of ONU as the upstream Interface card, transmit the flow chart of control, equally, in the present embodiment, set CLT1～n cascade, and CLT1 links to each other directly by the GE interface with ONU, ONU has n LLID interface: LLID1～n, as shown in Figure 3, its concrete steps are as follows:

Step 301:ONU preserves the MAC Address of CLT1～n and the corresponding relation between LLID1～n.

Step 302:CLT1～n receives business packet from user interface, according to default upstream queue division rule, this business packet is put into the first order upstream queue of the memory of this CLT.

Step 303:CLT1～n is respectively to ONU transmit queue report message, and the source MAC in this message is the MAC Address of this CLT, also carry in this message this CLT first order upstream queue ID, and each formation in the business packet number that comprises.

Step 304:ONU receives the individual queue report message, preserve the CLT in the individual queue report message MAC Address, first order upstream queue ID, and each formation in the corresponding relation of between business packet number that comprises.

Step 305:ONU detect LLIDm (the interface free time of 1≤m≤n), according to the corresponding relation in the step 301, determine the MAC Address of the corresponding CLTm of LLIDm interface; And according to the MAC Address of CLTm, find CLTm first order upstream queue ID, and each formation in the business packet number that comprises.

The total bandwidth that all receivable business packet take should be not more than the up bandwidth of distributing of LLIDm interface.

Step 306:ONU according to the first order upstream queue ID of the distributed upstream bandwidth of current LLIDm interface and CLTm, and each formation in the business packet number that comprises, determine the business packet place among the receivable CLTm first order upstream queue ID, and each formation in receivable business packet number.

Step 307:ONU is to CLTm transmit queue administrative messag, the target MAC (Media Access Control) address of this message is the MAC Address of CLTm, this message carry simultaneously the business packet place among the receivable CLTm first order upstream queue ID, and each formation in receivable business packet number.

Step 308: queue management message arrives CLT1, and CLT1 judges whether the target MAC (Media Access Control) address in this message is the MAC Address of this CLT, if, execution in step 309; Otherwise, execution in step 310.

Step 309:CLT1 is according to first order upstream queue ID in this message and the receivable business packet number of each formation, from the first order upstream queue of this CLT, take out business packet, on this business packet, encapsulate one deck MAC head again, source MAC in this MAC head is the MAC Address of CLT1, according to default upstream queue division rule, put into second level upstream queue, go to step 313.

Step 310:CLT1 goes out the queue management forwards according to the target MAC (Media Access Control) address in this message.

Step 311: the CLTm that described target MAC (Media Access Control) address points to receives queue management message, according to the received business packet number that comprises in the first order upstream queue ID in this message, each formation, from first order upstream queue, take out business packet, on this business packet, encapsulate one deck MAC head again, source MAC in this MAC head is the MAC Address of this CLT, according to default upstream queue division rule, put into second level upstream queue, and when the subtending port of this CLT is idle, from the upstream queue of the second level, takes out business packet and send to CLT1.

Step 312:CLT1 receives the business packet that CLTm sends, and according to default upstream queue division rule, business packet is put into the second level upstream queue of this CLT.

Step 313:CLT1 detects the GE interface during free time, takes out business packet from the upstream queue of the second level, and sends to ONU.

Step 314:ONU receives business packet, in the corresponding relation in step 301, searches the LLID of the source MAC correspondence in the outer MAC head of this business packet, the outer MAC head of business packet is peeled off the back send by this LLID interface.

In the present embodiment, in the step 302, CLT1～n also can be this business packet encapsulation last layer MAC head earlier before the first order upstream queue of the memory of business packet being put into this CLT, and the source MAC in this MAC head is the MAC Address of this CLT; Accordingly, in the step 309,311, CLT1 or other CLT just need not to have encapsulated the MAC head again before business packet is put into second level upstream queue.

From Fig. 2～3 illustrated embodiments as can be seen, the present invention need transform the standard GE interface between CLT1 and ONU, makes control messages and normal business packet all can transmit on the GE interface.

Control messages in the embodiment of the invention: queue report message and queue management message encapsulation form are as shown in table 1:

Leading (Preamble)
	Target MAC (Media Access Control) address (DA)
Source MAC (SA)
	VLAN (VLAN=3 or 4)
Formation 0 information (the business packet number that formation 0ID, formation 0 comprise)
	Formation 1 information (the business packet number that formation 1ID, formation 1 comprise)
Formation 2 information (the business packet number that formation 2ID, formation 2 comprise)
	……
Formation s information (the business packet number that formation sID, formation s comprise)
	Load
Frame Check Sequence (FCS)

Table 1 control messages encapsulation format

When control messages is that (1≤m≤when n) issuing the queue report message of ONU, target MAC (Media Access Control) address is the MAC Address of ONU to CLTm, and source MAC is the MAC Address of CLTm; When control messages is ONU when issuing the queue management message of CLTm, target MAC (Media Access Control) address is the MAC Address of CLTm, and source MAC is the MAC Address of ONU.Simultaneously, represent that with the different values of the VLANID among the VLAN this control messages is that queue report message still is queue management message, can be as shown in table 2:

VLANID	Stream type
		3	Queue report message
4	Queue management message

Table 2 VLANID and control messages type of relationship

As can be seen, control messages form that the embodiment of the invention provides and employing individual layer medium access control (MAC, Medium Access Control) form of Feng Zhuan ethernet frame is identical, for control messages and business packet are made a distinction, the embodiment of the invention has adopted the packaged type of MAC-IN-MAC to business packet, promptly on all business packet that transmit between ONU and CLTm, add one deck MAC head again, use different VLAN differentiated service bags and control messages in this MAC head.The business packet encapsulation format that table 3 provides for the embodiment of the invention:

Table 3 business packet encapsulation format

As shown in table 3, identifying this bag with the VLANID in the outer MAC head is business packet, and as long as this VLANID is different with VLANID in the control messages, for example: VLANID=2.

When business packet is uplink traffic, by CLTm for this business packet encapsulates outer MAC head, and the DA in the outer MAC head is the MAC Address of ONU, SA is the MAC Address of CLTm, after this business packet arrives ONU, ONU determines that according to this VLANID this bag is business packet, then peels outer MAC head earlier off, carries out subsequent treatment again.When business packet is downlink traffic, by ONU for this business packet encapsulates outer MAC head, and the DA in the outer MAC head is the MAC Address of CLTm, SA is the MAC Address of the CLT1 of ONU, after this business packet arrives CLTm, CLTm determines that according to this VLANID this bag is business packet, then peels outer MAC head earlier off, carries out subsequent treatment again.

The use ONU that Fig. 4 provides for first embodiment of the invention is as the structural representation of the CLT in the cascade CLT system of upstream Interface card, as shown in Figure 4, it mainly comprises: the first queue management unit 41, the second queue management unit 42, transmission control unit 43 and business packet transmission unit 44, wherein:

The first queue management unit 41: receive business packet from user interface, according to default upstream queue division rule, business packet is put into the first order upstream queue of the memory of this CLT, the business packet number that comprises in first order upstream queue ID, each formation is sent to transmission control unit 43; Receive the received business packet place that transmission control unit 43 sends first order upstream queue ID, and each formation in received business packet number, from corresponding queues, take out business packet and send to the second queue management unit 42.

The second queue management unit 42: receive the first queue management unit 41 of this CLT or the business packet that other CLT sends, according to default upstream queue division rule, business packet is put into second level upstream queue, detect subtending port or GE interface free time, from the upstream queue of the second level, take out business packet and send to business packet transmission unit 44.

Transmission control unit 43: each first order upstream queue ID in the memory of this CLT that the first queue management unit 41 is sent, and the business packet number that comprises of each formation be carried in the queue report message and send to ONU, the source MAC of this message is the MAC Address of this CLT; Receive the queue management message that ONU sends, the first order upstream queue ID and the received business packet number in each formation at the received business packet place in the queue management message sent to the first queue management unit 41.

Business packet transmission unit 44: receive the second queue management unit 42 and send business packet, business packet is sent to CLT1 or ONU.

The first queue management unit 41, the second queue management unit 42 can be collectively referred to as memory management unit.

The difference of the CLT that the second embodiment of the invention and first embodiment provide is:

Among the CLT that second embodiment of the invention provides, the first queue management unit 41 is put into business packet before the first order upstream queue of memory of this CLT, encapsulate last layer MAC head for business packet, and the source MAC of this MAC head is the MAC Address of this CLT.

Perhaps, the second queue management unit 42 will encapsulate last layer MAC head for business packet before business packet is put into second level upstream queue, and the source MAC of this MAC head is the MAC Address of this CLT.

The structural representation that Fig. 5 provides for first embodiment of the invention as the ONU of the upstream Interface card of cascade CLT, as shown in Figure 5, it mainly comprises: receive control unit 51 and LLID unit 52, wherein:

Receive control unit 51: receive the queue report message that CLT sends, preserve the business packet number that comprises in MAC Address, first order upstream queue ID and each formation of the CLT that carries in this message; Receive the assignable upstream bandwidth information that LLID unit 52 is sent, according to this assignable upstream bandwidth information, and the MAC Address of the CLT that preserves, the business packet number that comprises in first order upstream queue ID and each formation, determine the MAC Address of the CLT at receivable business packet place, receivable business packet number in first order upstream queue ID and each formation, send a queue management message at each CLT that can receive the business packet place, the target MAC (Media Access Control) address of this message is the MAC Address of described CLT, and this message is carried receivable business packet number in the first order upstream queue ID that can receive the business packet place and each formation simultaneously.

LLID unit 52: monitor the state of the LLID interface of this ONU, when the LLID interface is idle, assignable upstream bandwidth information is sent to reception control unit 51; Receive the business packet that CLT sends, this business packet is sent.

The structural representation that Fig. 6 provides for second embodiment of the invention as the ONU of the upstream Interface card of cascade CLT, as shown in Figure 6, it mainly comprises: logical links allocation units 60, receive control unit 61 and LLID unit 62, wherein:

Logical links allocation units 60: be the CLT assignment logic link that links to each other with this ONU, preserve the MAC Address of CLT1～n and the corresponding relation of LLID1～n.

Receive control unit 61: receive the queue report message that CLT sends, preserve the business packet number that comprises in MAC Address, first order upstream queue ID and each formation of the CLT that carries in this message; Receive the assignable upstream bandwidth information and the LLIDm (1≤m≤n) identify that send LLID unit 62, obtain MAC Address with the corresponding CLTm of LLIDm from LLID interface assignment unit 60, assignable upstream bandwidth information according to the LLIDm interface, and the business packet number that comprises in the first order upstream queue ID of the CLTm that preserves and each formation, determine receivable business packet in CLTm first order upstream queue ID and each formation in receivable business packet number, to CLTm transmit queue administrative messag, the target MAC (Media Access Control) address of this message is the MAC Address of CLTm, and this message is carried receivable business packet number in the first order upstream queue ID that can receive the business packet place and each formation simultaneously.

LLID unit 62: monitor the state of the LLID interface of this ONU, when the LLIDm interface is idle, the assignable upstream bandwidth information of LLIDm interface and LLIDm sign is sent to receive control unit 61; Receive the business packet that CLTm sends, obtain the corresponding LLIDm sign of source MAC the outer MAC head with this business packet from LLID interface assignment unit 60, the outer MAC head of this business packet is peeled off the back send by the LLIDm interface.

From first, second embodiment of the present invention as can be seen, CLTm (1≤m≤n) only when the up LLID interface of ONU is idle, just uplink traffic can be sent to ONU, and, the size of uplink traffic is to determine according to the distributed upstream bandwidth of ONU, therefore, need not to design bigger uplink traffic buffering area for ONU; Simultaneously, because for GE EPON system, the acceptable descending maximum stream flow of each ONU is 1000Mbps, and the interface between ONU and the CLT1～n is the GE interface, so ONU can directly send to CLT1～n with the downlink business flow, like this, also need not as can be seen, to greatly reduce the design cost of ONU for ONU designs bigger downlink traffic buffering area; In addition, be that jumbo chip external memory is supported in the provisional capital up and down because CLT1～n has a technical specification, therefore, in the embodiment of the invention, business packet is buffered in the big capacity chip external memory of CLT1～n, can not increase the design cost of CLT1～n.Thereby, reduced the design cost of whole use ONU as the cascade CLT system of upstream Interface card.

In addition, in the second embodiment of the invention, in ONU, distribute a LLID interface for each CLT, like this, the uplink traffic of each CLT can be in ONU sends independently, and the situation of having avoided the uplink traffic of some CLT slowly can't send has improved the overall transfer efficient of cascade CLT system.

The above only is process of the present invention and method embodiment, in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is not equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. a transfer control method is applied to it is characterized in that with in the cascade coaxial line terminal CLT system of optical network unit ONU as the upstream Interface card, comprising:

ONU is each coupled CLT assignment logic link;

Each CLT sends to ONU with the information of business packet to be sent;

ONU detects the LLID LLID interface free time of self, and the information of the described business packet to be sent that sends according to each CLT and the up bandwidth of distributing of ONU are determined the received business packet of each logical links corresponding with each CLT;

2. the method for claim 1 is characterized in that, described ONU is that each coupled CLT assignment logic link is: ONU distributes a logical links for all CLT,

Perhaps: ONU distributes a logical links for each CLT.

3. method as claimed in claim 1 or 2, it is characterized in that described each CLT sends to ONU with the information of business packet to be sent and is: with the media access control MAC address of this CLT, the first order upstream queue ID of storage business packet to be sent and the business packet number notice ONU that each formation comprises.

4. method as claimed in claim 1 or 2 is characterized in that,

5. method as claimed in claim 1 or 2 is characterized in that, described method further comprises: preestablish: the VLANID of the outer MAC head by message identifies this message and is control message or service message.

6. method as claimed in claim 5 is characterized in that, the business packet that described each logical links can be transmitted this link is transferred to ONU from CLT and comprised:

7. coaxial line terminal CLT, this CLT are arranged in and use the cascade CLT system of optical network unit ONU as the upstream Interface card, it is characterized in that, comprising:

8. CLT as claimed in claim 7 is characterized in that, described memory management unit comprises:

9. as claim 7 or 8 described CLT, it is characterized in that described memory management unit is further used for, at the skin encapsulation MAC of business packet head, and the source MAC in the MAC head is the MAC Address of this CLT.

10. the optical network unit ONU as the upstream Interface card of cascade coaxial line terminal CLT is characterized in that, comprising:

Receive control unit, receive and preserve the business packet information to be sent that each CLT sends, receive the up bandwidth information of distributing, detect the LLID LLID interface free time of self, the information of the described business packet to be sent that sends according to this bandwidth information and each CLT, determine the received business packet of each logical links corresponding, send to CLT and can receive business packet information with each CLT;

11. ONU as claimed in claim 10 is characterized in that, described ONU further comprises: the logical links allocation units are used to each the CLT assignment logic link that links to each other with this ONU.