CN1113513C - Bandwidth shared ATM access method and devices - Google Patents
Bandwidth shared ATM access method and devices Download PDFInfo
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- CN1113513C CN1113513C CN99101626A CN99101626A CN1113513C CN 1113513 C CN1113513 C CN 1113513C CN 99101626 A CN99101626 A CN 99101626A CN 99101626 A CN99101626 A CN 99101626A CN 1113513 C CN1113513 C CN 1113513C
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Abstract
The present invention relates to a method and a device for access through the asynchronous transfer mode of bandwidth sharing. When downlink signals are received, test whether the downlink signals belong to an ONU cell, if true, distribute the signals to each broadband user, else an ATM cell is discarded; in terms of uplink signals, whether cells to be processed exist is known through polling a broadband service multiplexer and a second ATM physical layer element; when the cells to be processed exist, the ATM cell is transferred to a first ATM physical layer element, converted and then sent out through a first optical port. When the access technology through the asynchronous transfer mode of bandwidth sharing of the present invention is implemented, the utilization rate of SDH bandwidth can be increased, ATM ports can be decreased, and narrowband access networks can be easily and smoothly transited to broadband access networks while the cost is not high.
Description
The present invention relates to the communication technology, be specifically related to broadband access technology, more particularly, relate to a kind of ATM access method and equipment of shared bandwidth.
Along with the development that the communication technology is maked rapid progress, the existing multiple access scheme of being with surely.According to the broadband access technology branch cable modem (Cable Modem), optical networking (PON) are arranged.XDSL etc.; According to the interface branch of broadband backbone network, ATM (asynchronous communication mode), gigabit Ethernet and IP over SDH, IP over Fibre in the ascendant are arranged.Gigabit Ethernet is actual to be the bus contention mode, shares the bandwidth of interface, the bandwidth availability ratio height, but can not guarantee service quality.ATM is a kind of towards connected mode, and by consulting (permanent virtual is connected or exchange virtual connections) distribution bandwidth with the user and guarantee service quality, bandwidth availability ratio is also higher.Because the atm technology maturation, the support multiple business also guarantees service quality, so the broadband backbone network is many based on ATM.The interface of ATM backbone support has E3 (34M), DS-3 (45M), OC-3 (155M), OC-12 (622M) etc., and the interface of ATM access switch is based on OC-3 (ATM-155M).Existing Access Network is based on SDH's, progressively popularize because Fiber To The Curb, Fiber To The Building, in order to realize broadband access, for example an E3 or ATM (OC-3) are given an optical network unit (ONU), monopolize 34M or 155M on the ONU, the port price of ATM is higher on the one hand, and the broadband services development is limited on the other hand, is little desirable (as shown in Figure 1) economically.
The object of the present invention is to provide a kind of ATM access method of shared bandwidth, utilize this method can improve the utilance of switch ports themselves, make and realize the shared possibility that becomes in broadband with lower cost.
Another purpose of the present invention is to provide a kind of asynchronous communication mode access device of shared bandwidth, utilize this equipment can be according to network application and load condition, realize that neatly a plurality of ONU share a switch ports themselves, thereby improve its utilance greatly, make with flexible change resource distribution, realize at lower cost that the broadband is shared and become possibility.
According to the ATM access method of a kind of shared bandwidth provided by the invention, comprise ATM uplink optical fibers signal processing and ATM downlink optical fiber signal processing, it is characterized in that described downlink optical fiber signal processing may further comprise the steps:
By the down direction signal rows conversion of signals of first light/electric converting unit to receiving by the first light mouth,
Is ATM cell by an ATM physical layer device with electrical signal conversion,
The ATM cell of changing out is issued ATM service duplexer and the 2nd ATM physical layer device,
Judge by described ATM service duplexer whether described ATM cell belongs to the cell of this ONU, if belong to the cell of this ONU, then this downstream signal is distributed to each broadband user,, then this ATM cell is abandoned or do special processing if not the cell that belongs to this ONU;
By described the 2nd ATM physical layer device described ATM cell is converted to the signal of telecommunication, is light signal with described electrical signal conversion and sends from the second light mouth by second light/electric converting unit.
In the ATM access method of shared bandwidth of the present invention, described ATM uplink optical fibers signal processing may further comprise the steps:
Carry out conversion of signals by second light/electric converting unit to receiving the up direction signal by the second light mouth,
Is ATM cell by the 2nd ATM physical layer device with electrical signal conversion,
Poll broadband services multiplexer and described the 2nd ATM physical layer device have or not cell pending,
If any pending cell, send this ATM cell to an ATM physical layer device, described ATM cell is converted to the signal of telecommunication, be light signal with described electrical signal conversion and send by first light/electric converting unit from the first light mouth.
Asynchronous communication mode access device according to a kind of shared bandwidth provided by the invention, comprise the first optical fiber transmission/receiving port, the second optical fiber transmission/receiving port, respectively with the described first optical fiber transmission/receiving port, first light/electric converting unit and second light/electric converting unit that the second optical fiber transmission/receiving port connects, an ATM physical layer device that is connected with second light/electric converting unit with described first light/electric converting unit respectively, the 2nd ATM physical layer device, the cell output terminal of a described ATM physical layer device is connected to the cell input of described the 2nd ATM physical layer device, also receive the cell input of broadband services multiplexer simultaneously, the cell output terminal of the cell output terminal of described the 2nd ATM physical layer device and described broadband services multiplexer is connected respectively to the input of cell selected cell, and the output of described cell selected cell is connected to the cell input of a described ATM physical layer device.
Asynchronous communication mode access device according to a kind of shared bandwidth provided by the invention, it is characterized in that, described ATM physical layer device comprises a cell buffer, described broadband services multiplexer comprises a cell buffer, described cell selected cell can be a signal polling set-up, be used for the buffer of the described ATM physical layer device of poll and the buffer of described broadband services multiplexer, therefrom select one successively and exported.
Implement the ATM access method and the equipment of shared bandwidth provided by the invention, can make and improve the SDH bandwidth availability ratio, reduce atm port, and, being easy to the narrow band access net to the level and smooth transition in broadband, cost is not high yet.
In conjunction with the accompanying drawings and embodiments, further specify characteristics of the present invention, in the accompanying drawing:
Fig. 1 is the schematic diagram of prior art ATM broadband access scheme;
Fig. 2 is the schematic diagram that the invention provides the ATM broadband access scheme of sharing bandwidth;
Fig. 3 is the structural representation of the ATM broadband access equipment of shared bandwidth of the present invention;
Fig. 4 is a down direction handling process schematic diagram among the inventive method embodiment;
Fig. 5 is a up direction handling process schematic diagram among the inventive method embodiment;
Fig. 6 is the structural representation that an instantiation system of the inventive method and equipment is used in explanation.
Abbreviation in the specification is unitedly described as follows SDH: Synchronous Digital Hierarchy; OLT: optical line terminal; ONU: optical network unit.ATM-PHY: the device of handling the ATM physical layer.
As shown in Figure 1, the ATM broadband access situation of prior art, there is shown three ONU101～103 that are connected to ATM access switch 105 by optical line terminal OLT (calling OLT in the following text) 104, wherein ATM access switch 105 comprises 3 OC-3 (ATM-155M) interface, three ONU that connect respectively are shared, specifically, first ATM-155M interface is shared by first ONU 101, second ATM-155M interface is shared by second ONU 102, and the 3rd ATM-155M interface is shared by the 3rd ONU 103.
Fig. 2 shows the connection situation of the ATM broadband access network of sharing bandwidth of the present invention, promptly by same bandwidth of breathing heavily mouth in a plurality of (Fig. 2 is depicted as three) ONU201～203 sharing A TM access switch 205.This mode makes broadband access that suitable flexibility be arranged, and at the networking initial stage or decide the band business and have in limited time, is shared the bandwidth of a port by a plurality of ONU; Along with broadband services development and number of users increase, can gradually reduce the ONU number of sharing same atm port, finally may become the access way of Fig. 1, i.e. corresponding ONU of each port in the ATM switch.
For the asynchronous communication mode of realizing shared bandwidth as shown in Figure 2 inserts, existing ONU is transformed, as shown in Figure 3, at suitable ATM access device with shared bandwidth provided by the invention is that ONU includes two light mouths i.e. first light mouth 301 and the second light mouth 302, be connected to two light/electric converting unit 303 respectively, 304, each light/electric converting unit 303,304 are connected to an ATM-PHY device 305 respectively, 306, when an output of ATM-PHY device 305 is connected to another ATM-PHY device 306, be connected to broadband services multiplexer 308, an output of broadband services multiplexer 308 and the output of another ATM-PHY device 306 are connected respectively to the input of logical block 307, and the output of logical block 307 is connected to the input of ATM-PHY device 305.When the cell of descending optical fiber is dealt into ONU shown in Figure 3, ONU unconditionally is transmitted to next stage ONU, judges whether it is the cell of this ONU by broadband services multiplexer 308 when receiving the ATM cell of downlink optical fiber simultaneously, if not abandoning automatically.For the cell of uplink optical fibers, mail to upper level ONU or OLT with the last row cell addition of this ONU.Specifically with reference to the process chart of the uplink and downlink direction shown in figure 4 and Fig. 5.
Herein, relative ATM switch has the branch of uplink and downlink.The optical fiber that carrying is sent cell from ATM switch is downlink optical fiber, and the optical fiber that the carrying ATM switch receives cell is uplink optical fibers.
According to the handling process of the down direction of cut-in method of the present invention as shown in Figure 4, the cell of receiving from downlink optical fiber, the first light mouth 301 by ONU receives, after being converted to the signal of telecommunication by photoelectric conversion unit 303, is ATM cell by an ATM-PHY device 305 with electrical signal conversion, by hardware poll logic 307, cell is issued broadband services multiplexer 308 and the 2nd ATM-PHY device 306 then.308 li ATM that have a connection table to preserve this ONU of broadband services multiplexer connect, and the foundation of connection table is to be provided with and SVC (exchange dotted line road) call setup by PVC (permanent virtual circuit).Broadband services multiplexer 308 judges by connecting table whether the cell that receives is the cell of this ONU, and the cell of this ONU is mail to each broadband user, and the cell that does not belong to this ONU is abandoned.
The cell that the 2nd ATM-PHY device 306 receives from an ATM-PHY device 305 is converted to the signal of telecommunication by the 2nd ATM-PHY device 306, and send from the second light mouth 302 electric light conversion back then.
According to the handling process of the up direction of the inventive method as shown in Figure 5, the cell of receiving from uplink optical fibers, receive from the second light mouth 302, be converted to the signal of telecommunication by photoelectric conversion unit 304 after, be that ATM cell is placed in the buffer by the 2nd ATM-PHY device 306 with electrical signal conversion.Simultaneously, broadband services multiplexer 308 also receives the cell that the broadband user sends and is placed in the buffer.
By the buffer of hardware logic 307 polls the 2nd ATM-PHY device 306 and broadband services multiplexer 308, if there is cell just cell to be mail to an ATM-PHY device 305 in the buffer.
The cell that the one ATM-PHY device 305 receives is converted to the signal of telecommunication by an ATM-PHY device A305, and send from the first light mouth 301 electric light conversion 303 backs then.
Method and apparatus of the present invention is specially adapted to asymmetric broadband access technology, for example ADSL.Because for example High Speed I nterne access, video request program (VOD) etc. all are that upstream rate is lower, on the cell of uplink optical fibers and this ONU, can think that bandwidth is enough during the row cell addition, need not guarantee ATM service quality to the congested special disposal of doing, reduce equipment complexity and cost again.
Fig. 6 shows an application example of the inventive method and equipment, it is to be example with the ADSL broadband access, adopt the SDH (SDH: ring of light synchronous digital hierarchy) of 622M or 2.5G, divide 155M to share for the DSLAM of ADSL broadband access frame (DSLAM) use and a plurality of ONU, remaining bandwidth is used for narrow band service.Here ADSL broadband access frame (DSLAM) both can have been realized the long-range access of ADSL, the mode of promptly Fiber To The Curb ten ADSL; Can realize that again local lan inserts.The broadband user inserts RTU by Ethernet (10Base-T), delivers to DSLAM by the ADSL technology again, and local lan also inserts DSLAM.DSLAM is converted to cell (also can Ethernet be converted to cell by RTU) with Ethernet, insert the 155M of broadband access among the SDH by the asynchronous communication mode access technology of shared bandwidth of the present invention, through OLT, deliver to the ATM access switch, connect ATM backbone then.In ATM backbone, both can pass through ISP (Internet service provider) and insert the Internet, also can insert enterprise network etc.This system is owing to adopted " the asynchronous communication mode access technology of shared bandwidth ", and the SDH bandwidth availability ratio improves, and atm port also only needs one, and the narrow band access net is at an easy rate to surely with level and smooth transition, and cost is not high yet.
Claims (6)
1, a kind of ATM access method of shared bandwidth comprises ATM uplink optical fibers signal processing method and ATM downlink optical fiber signal processing method, it is characterized in that described downlink optical fiber signal processing method may further comprise the steps:
By first light/electric converting unit the down direction signal that is received by the first light mouth is carried out conversion of signals,
Is ATM cell by an ATM physical layer device with electrical signal conversion,
The ATM cell of changing out is issued ATM service duplexer and the 2nd ATM physical layer device,
Judge by described ATM service duplexer whether described ATM cell belongs to the cell of this ONU, if belong to the cell of this ONU, then this downstream signal is distributed to each broadband user,, then this ATM cell is abandoned or do special processing if not the cell that belongs to this ONU;
By described the 2nd ATM physical layer device described ATM cell is converted to the signal of telecommunication, is light signal with described electrical signal conversion and sends from the second light mouth by second light/electric converting unit,
Its feature is that also described ATM uplink optical fibers signal processing method may further comprise the steps:
Carry out conversion of signals by second light/electric converting unit to receiving the up direction signal by the second reception light mouth,
Is ATM cell by the 2nd ATM physical layer device with electrical signal conversion,
Poll broadband services multiplexer and described the 2nd ATM physical layer device have or not cell pending,
If any pending cell, send this ATM cell to an ATM physical layer device, described ATM cell is converted to the signal of telecommunication, be light signal with described electrical signal conversion and send the light mouth from first and send by first light/electric converting unit.
2, ATM access method according to claim 1, it is characterized in that, also comprise the step that is connected table that is arranged on the ATM link information of a minute book ONU in the described broadband services multiplexer by PVC setting and Switched Virtual Circuit call setup.
3, ATM access method according to claim 2 is characterized in that, described broadband services multiplexer judges by described connection table whether the cell that receives is the cell of this ONU.
4, a kind of asynchronous communication mode access device of shared bandwidth is characterized in that, comprising:
The first optical fiber transmission/receiving port, the second optical fiber transmission/receiving port;
Respectively the first light/electric converting unit that is connected with the described first optical fiber transmission/receiving port, the second optical fiber transmission/receiving port and second light/electric converting unit,
An ATM physical layer device that is connected with second light/electric converting unit with described first light/electric converting unit respectively, the 2nd ATM physical layer device, the cell output terminal of a described ATM physical layer device is connected to the cell input of described the 2nd ATM physical layer device, also receive the cell input of broadband services multiplexer simultaneously, the cell output terminal of the cell output terminal of described the 2nd ATM physical layer device and described broadband services multiplexer is connected respectively to the input of cell selected cell, and the output of described cell selected cell is connected to the cell input of a described ATM physical layer device.
5, asynchronous communication mode access device according to claim 4, it is characterized in that, described ATM physical layer device comprises a cell buffer, described broadband services multiplexer comprises a cell buffer, described cell selected cell can be a signal polling set-up, be used for the buffer of the described ATM physical layer device of poll and the buffer of described broadband services multiplexer, therefrom select one successively and exported.
6, asynchronous communication mode access device according to claim 4, it is characterized in that, described broadband services multiplexer comprises the connection table of the ATM link information of a minute book ONU, and described connection table is by PVC setting and Switched Virtual Circuit call setup.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99101626A CN1113513C (en) | 1999-02-01 | 1999-02-01 | Bandwidth shared ATM access method and devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99101626A CN1113513C (en) | 1999-02-01 | 1999-02-01 | Bandwidth shared ATM access method and devices |
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| CN1262566A CN1262566A (en) | 2000-08-09 |
| CN1113513C true CN1113513C (en) | 2003-07-02 |
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| CN99101626A Expired - Fee Related CN1113513C (en) | 1999-02-01 | 1999-02-01 | Bandwidth shared ATM access method and devices |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2829327A1 (en) * | 2001-09-06 | 2003-03-07 | Cit Alcatel | NETWORK IN RING REALIZED FROM A DUAL OPTICAL BUS |
| CN100401719C (en) * | 2005-03-09 | 2008-07-09 | 华为技术有限公司 | Communication information process transmission system |
| CN101267390B (en) * | 2008-05-07 | 2010-11-10 | 蓝鸽集团有限公司 | Asynchronous delay network communication method, its system and buffer processing device |
| CN101277244B (en) * | 2008-05-08 | 2012-06-06 | 蓝鸽集团有限公司 | ATM synchronous Ethernet and method for transmitting/receiving data |
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