CN1997238B - TDMA passive optical network OLT system for broadcast service - Google Patents

TDMA passive optical network OLT system for broadcast service Download PDF

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Publication number
CN1997238B
CN1997238B CN2006100642352A CN200610064235A CN1997238B CN 1997238 B CN1997238 B CN 1997238B CN 2006100642352 A CN2006100642352 A CN 2006100642352A CN 200610064235 A CN200610064235 A CN 200610064235A CN 1997238 B CN1997238 B CN 1997238B
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China
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frame
data
tdma
tdma pon
ont
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Chinese (zh)
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CN1997238A (en
Inventor
尹彬荣
李东洙
金宗德
朴晟雄
李文燮
金奉泰
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Electronics and Telecommunications Research Institute ETRI
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Electronics and Telecommunications Research Institute ETRI
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2854—Wide area networks, e.g. public data networks
    • H04L12/2856—Access arrangements, e.g. Internet access
    • H04L12/2869—Operational details of access network equipments
    • H04L12/2878—Access multiplexer, e.g. DSLAM
    • H04L12/2879—Access multiplexer, e.g. DSLAM characterised by the network type on the uplink side, i.e. towards the service provider network
    • H04L12/2885—Arrangements interfacing with optical systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2589—Bidirectional transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2589—Bidirectional transmission
    • H04B10/25891—Transmission components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/08—Time-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/22—Adaptations for optical transmission

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Multimedia (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)

Abstract

The present invention provides a TDMA (Time Division Multiple Address) PON (Passive Optical Network) OLT (Optical Line Terminal) system for broadcast service, including packet processor, header information (IP address of packet header, MAC (multiple access control) address of Ethernet frame etc.) for receiving data by using outer nodes or ONT (Optical Network terminal) to determine information according to frame type (unicast, multicast and broadcast frames) and output port of switch, and the second data are generated by adding the information onto the header of the frame; a switch, copying the second data predetermination times according to transmission way and transferring the second data to corresponding output port according to identification code; M TDMA PON MAC processors, removing the identification code added onto the second data and transforming the second into TDMA PON frame; and M optical transceivers transforming TDMA PON frame into light signal and transferring the light signal to ONT.

Description

The TDMA passive optical network OLT system that is used for broadcasting service
The cross reference of related application
The application require on December 9th, 2005 Korea S Department of Intellectual Property submit to korean patent application No.10-2005-0121026 and the priority of the korean patent application No.10-2006-0029083 that submitted in Korea S Department of Intellectual Property on March 30th, 2006, introduce its content in the lump with for referencial use at this.
Technical field
The present invention relates to a kind of system that is used for the broadcasting service of EPON (PON) system, relate more specifically to and to broadcast time division multiple access (TDMA) PON optical line terminal (OLT) system with communication service simultaneously by single fiber optic cable.
Background technology
Cyberprise has been made great amount of investment in can handling the three-in-one business (TPS) of broadcasting, sound and data in one network.
Need more downlink bandwidth for the Optical Network Terminal among the OLT (ONT), so that the network that utilizes that Fiber to the home (FTTH) provides broadcasting service such as internet protocol TV (IPTV) to the user.
In the ultrahigh speed internet network, downlink traffic is bigger than upstream traffic.Therefore, if broadcasting service additionally is provided, then the ratio of downlink traffic and upstream traffic is seriously asymmetric.
Yet, in gigabit PON (GPON) system that ITU-T recommends in G.984.1～2, the ratio of downlink traffic and upstream traffic can the scope between 1: 1 and 1: 4 in.Under the situation of standardized Ethernet PON (EPON) system, the ratio of downlink traffic and upstream traffic is 1: 1 in IEEE 802.3ah.
Therefore, in current TDMA PON system and present network,, network efficiency is reduced because speed uplink of being predicted and downstream rate is seriously asymmetric.This has increased the expense of OLT equipment.
The multicasting method that is used for addressing this problem that uses in TDMA-PON can postpone the change of channel, thereby causes user's inconvenience.In addition, use the broadcasting method of additional wavelength division multiplexing to need expensive optical transceiver and expensive image intensifer that broadcast singal only is provided.
Summary of the invention
The invention provides a kind of time division multiple access (TDMA) EPON (PON) optical line terminal (OLT) system that is used for broadcasting service.
According to an aspect of the present invention, a kind of transmitter of the TDMA PON OLT system that is used to broadcast is provided, comprise: packet handler, header based on first data determines whether first data are received as broadcasting, multicast or clean culture, and interpolation is used for determining that the identification code of output port is to produce second data; Switch duplicates second data pre-determined number and according to identification code second data is sent to corresponding output port; M TDMA PON mac processor removes the identification code that adds second data to and second data conversion become TDMA PON frame; With M optical transceiver, TDMA PON frame transform is become light signal and light signal is sent to ONT.
According to another aspect of the present invention, a kind of receiver that is used for the TDMA PON OLT system of broadcasting service is provided, comprise: M optical receiver, receive light signal with burst mode characteristic, this light signal be transmit from ONT and from this light signal, extract data; M TDMA PON mac processor recovers TDMA PON frame from the data of being extracted; Switch, the multiplexing TDMA PON frame that recovers; And packet handler, from multiplexed frame, recover one of ethernet frame data and grouped data.
Description of drawings
By being described in detail with reference to the attached drawings one exemplary embodiment of the present invention, above-mentioned and other characteristics of the present invention will become and more apparent, wherein:
Fig. 1 illustrates the view that transmits the method for frame in existing TDMA PON OLT system; And
The view that is used to provide such as the configuration of the TDMA PONOLT system of the broadcasting service of IPTV according to of the present invention is provided Fig. 2.
Embodiment
Below with reference to accompanying drawing the preferred embodiments of the present invention are described.
Fig. 1 illustrates the view that transmits the method for frame in existing time division multiple access (TDMA) EPON (PON) optical line terminal (OLT) system.
Network is sent to data in user's the method utilizing that Fiber to the home (FTTH), standardization such as the TDMA PON technology of Ethernet PON (EPON) and gigabit PON (GPON).During the downlink transfer of the data-signal of (ONT) from OLT to the Optical Network Terminal, TDMA PON uses the continuous mode transmission technology as existing optical transport technology.Yet during the uplink of the data-signal from ONT to OLT, TDMA PON uses the burst mode transfer technology to transmit the grouped data that receives from each ONT.
The downlink traffic to the transmission of ONT 120 to ONT 130 from OLT 100 will be described now.The packet handler 101 of OLT100 is handled the data of L3 to the L7 layer that receives from external node or from ONT 120 to ONT 130, and the frame of handling is sent to TDMA PON media interviews control (MAC) processor 102 and 104.
Be connected at the packet handler with data processing performance A under the situation of TDMAPON mac processor of the link-speeds with A/m, M TDMA PON mac processor 102 and 104 is re-used and is connected to each other to reduce parts number.The TDMA PON frame that TDMA PON mac processor 102 and 104 standard recommendation according to GPON and EPON will have logical link identifier (LLID) or optical network unit (ONU) ID is sent to optical transceiver 103 and 105.
Optical transceiver 103 becomes light signal with 105 with converting electrical signal, and by optical link light signal is sent to splitter 140 according to standard recommendation.Splitter 140 is shunted to each light signal k light signal according to standard recommendation in the shunt scope, and this k light signal is sent to ONT 120 to ONT 130.
The optical transceiver 121 of ONT 120 to ONT 130 becomes the signal of telecommunication to 131 with converting optical signals, and the signal of telecommunication is sent to TDMA PON mac processor 122 to 132.TDMA PON mac processor 122 to 132 extracts the TDMA PON frame of data to recover to transmit from OLT 100 from the signal of telecommunication.
TDMA PON mac processor 122 to 132 standard recommendation according to GPON and EPON become the TDMA PON frame transform that is recovered ethernet frame and ethernet frame are sent to bridger 123 to 133.Bridger 123 to 133 is sent to the purpose subscriber equipment with ethernet frame.
The upward signal that sends to OLT 100 from ONT 120 to 130 will be described now.The bridger 123 to 133 of ONT 120 to 130 will be sent to TDMA PON mac processor 122 to 132 from the ethernet frame that subscriber equipment receives.
TDMA PON mac processor 122 to 132 is transformed into TDMA PON frame with ethernet frame, and has only when when allowing to TDMA PON mac processor 122 to 132 transmission frames under the control of OLT 100, just TDMA PON frame is sent to optical transceiver 121 to 131.
Optical transceiver 121 becomes light signal to 131 with converting electrical signal, and has only and just transmit light signal when allowing the frame transmission, and when not allowing the frame transmission interception light signal disturb so that prevent the signal among the ONT 120 to 130.Such method for transmitting signals is known as burst mode.
Splitter 140 will carry out multiplexing from the signal that k ONT receives, and multiplexed signals will be sent to the optical transceiver 103 of OLT100.
Optical transceiver 103 extracts data from the light signal that transmits with burst mode, and the data of being extracted are sent to TDMA PON mac processor 102.
TDMA PON mac processor 102 is sent to packet handler 101 according to the standard recommendation processed frame and with handled frame.It is M the TDMA PON mac processor 102 and the grouping of TDMA PON mac processor 104 transmission that packet handler 101 is handled from maximum number, and the grouping that will handle is sent to the destination interface of up link or PON.
Compared with existing network, need more downlink bandwidths to utilize the FTTH network to provide broadcasting service such as IPTV to the user.In superfast internet, downlink traffic is heavier than upstream traffic.If broadcasting service additionally is provided, then the ratio of downlink traffic and upstream traffic is asymmetric further.In asymmetric TDMA PON system, because asymmetric traffic carrying capacity characteristic can not be used Internet resources effectively.Thus, increased the expense of equipment and facility.
In existing TDMA PON system, because the restriction of bandwidth will not need the broadcast frame of many bandwidth to be sent to all PON users.Yet, carry out multicast and the IPTV broadcasting service offered all PON users by using Internet Group Management Protocol (IGMP), or utilize the wavelength division multiplexing method of using the wavelength that separates with data traffic signals and this service broadcast.
Postpone because channel changes, the multicast meeting causes user's inconvenience.Utilize the broadcast mode extra demand of wavelength division multiplexing method only to be used for the optical receiver and the expensive image intensifer of the costliness of broadcast singal, therefore increased the expense of constructing existing TDMA PON system.
Fig. 2 illustrates to be used to provide view such as the configuration of the TDMAPON OLT system of the broadcasting service of IPTV according to the embodiment of the invention.
Comprise packet handler 201, switch 202, TDMA PON mac processor 203 and 205 and optical transceiver 204 and 206 according to the TDMA PON OLT system of present embodiment.In TDMA PON OLT system, transmission means is categorized into from OLT to the downlink transfer of ONT with from the uplink of ONT to OLT.
The packet handler 201 of OLT 200 is handled the data of L3 to the L7 layer that receives from ONT 220 to 230 or from external node at down direction, generation comprises the frame interior of the information of relevant purpose TDMA PON port and frame identification, and this frame interior is sent to switch 202.
Packet handler 201 is to recover frame individual TDMA PON mac processor 203 of M and 205 data that receive from maximum number at up direction, and, these frames are sent to up link or TDMA PON port according to the address information of packet header or ethernet header.
It is the individual TDMA PON mac processor of M that the switch 202 of OLT 200 is connected to maximum number, receive the frame of the bandwidth with maximum A of traffic carrying capacity from packet handler 201 at down direction, this frame classification is become broadcasting, multicast and unicast frame, the copy broadcast frame and and send it to all m TDMAPON mac processor, unicast frame is sent to purpose TDMA PON mac processor, and duplicates the multicast frame and send it to the TDMA PON mac processor that is designated as the destination.
Switch 202 is sent to the packet handler 201 with largest packet handling property A at the multiplexing frame that receives by the TDMA PON mac processor of m from maximum number of up direction and with multiplexing frame.
Here, M represents to be connected to by switch the number of the TDMA PON mac processor of packet handler, and is determined by measuring from the upstream traffic of TDMA PON mac processor reception by the user.If the user does not allow to lose or damage any frame, can measure the transmission of uplink data speed of M TDMA PON mac processor, make the maximum link speed (A) of down direction divided by maximum transfer speed, thereby the value of determining to produce from division is as M.
Yet,, can reduce data transmission bauds if the user allows to lose some rudimentary frames.Therefore, thus the value that can increase m is connected to packet handler 201 with more TDMA PON mac processor.
TDMA PON mac processor 203 and 205 from switch 202 received frames, is handled the MAC function that is used for TDMA PON downstream signal at down direction, and frame is sent to optical transceiver 204 and 206.
From optical transceiver 204 and 206 received signals, processing is used for the MAC function of TDMA PON upward signal and passes the signal to switch 202 TDMA PON mac processor 203 and 205 at up direction.
The optical transceiver 204 of OLT 200 and 206 from TDMA PON mac processor 203 and 204 received frames, becomes have the light signal of speed A/n with converting electrical signal at down direction, and light signal is sent to splitter 240.Here, n represents the ratio of downlink speed and uplink speed.
Because EPON has 1G speed and has 1G speed at up direction at down direction, so n=1.Have 2.5G speed and have under the situation of GPON of 1.25G speed n=2 at up direction at down direction.During being transformed into light signal, must adjust the power (power) of a number k branch of splitter rightly.
The optical transceiver 204 of OLT 200 and 206 extracts data at up direction from the light signal that transmits with burst mode, and the data of being extracted are sent to TDMA PON mac processor 203 and 205.TDMAPON mac processor 203 and 205 is sent to switch 202 according to the standard recommendation processed frame and with the frame of handling.
Splitter 240 has the light signal of transmission speed A along separate routes and signal along separate routes is sent to ONT 220 to 230 at down direction.K represents the number of branches of splitter 240.Splitter 240 is at multiplexing light signal that receives from ONT 220 to 230 of up direction and the optical transceiver 204 and 206 that institute's multiplexed optical signals is sent to OLT 200.
ONT 220 to 230 comprises optical transceiver 221 and 231, TDMA PON mac processor 222 and 232 and bridger 223 and 233 respectively.Optical transceiver 221 becomes converting optical signals the signal of telecommunication and the signal of telecommunication is sent to TDMA PON mac processor 222 and 232 with 231.
Optical transceiver 204 becomes light signal at up direction with converting electrical signal with 206, and have only and when allowing transmission frame, just transmit light signal, and the interception light signal, disturb to prevent the signal among the ONT 220 to 230.
TDMA PON mac processor 222 and 232 recovers from the TDMAPON frame of OLT 200 receptions at down direction, only will be sent to TDMA PON mac processor 222 and become ethernet frame, and ethernet frame will be sent to bridger 223 and 233 with 232 TDMA PON frame transform.TDMA PON mac processor 222 and 232 is transformed into TDMA PON frame with ethernet frame, and has only when OLT 200 allows to its transmission frame, just TDMA PON frame is sent to optical transceiver 221 and 231.
Bridger 223 and 233 is sent to the purpose subscriber equipment at the down direction processed frame and according to the destination address of ethernet header with frame.Bridger 223 and 233 will promptly will be sent to the frame of OLT 200 from the frame of purpose subscriber equipment reception, be sent to TDMA PON mac processor 222 and 232.
As mentioned above, in TDMA PON OLT according to the present invention system, utilize FTTH network, can broadcast broadcasting service effectively such as IPTV based on TDMA PON.
Therefore, can reduce in existing TDMA PON OLT system by the time delay such as the caused converted channel of broadcasting service of IPTV is provided.
And, the transmission speed of uplink and downlink can be set in based on the FTTH network of TDMA PON asymmetricly.The user that therefore, can adapt to maximum number.As a result of, Internet resources can be effectively utilized so that in FTTH network, provide IPTV business effectively and economically based on TDMA PON.
Although specifically illustrated and described the present invention in conjunction with one exemplary embodiment, but those of ordinary skills should be understood that, not breaking away under the situation of the spirit and scope of the present invention as defined by the appended claims, can make various changes in form and details.

Claims (7)

1. the transmitter of a TDMA (time division multiple access) PON (EPON) OLT (optical line terminal) system, with compare to the upstream data that OLT transmits from ONT (Optical Network Terminal), this system comprises the more substantial downlink data that transmits to ONT from OLT, and this transmitter comprises:
Packet handler, the information of relevant frame type and switch output port is determined in utilization from the header information of the data of external node or ONT reception, and the header portion that described information is appended to described frame is to produce frame interior, the header information of wherein said data comprises the IP address of packet header and the MAC of ethernet frame (media interviews control) address, and described frame type is clean culture, multicast and broadcast frame;
Switch, according to the identification information of the frame that receives from described packet handler classify described frame type and described switch output port, the copy broadcast frame also sends it to all M TDMA PONMAC processor, duplicate the multicast frame and send it to corresponding switch output port, and only unicast frame is sent to corresponding purpose output port;
M TDMA PON mac processor receives described frame interior from described switch, and removes the relevant frame type that appends to described frame header and the described information of switch output port for described frame interior is transformed into TDMA PON frame; With
M optical transceiver will become light signal and described light signal is sent to ONT from the described TDMA PON frame transform of M TDMA PON mac processor output.
2. the receiver of a TDMA PON OLT system is compared with the upstream data that is sent to OLT from ONT, and this system comprises and more substantially be sent to the downlink data of ONT from OLT that this receiver comprises:
M optical transceiver extracts data from the light signal that transmits with burst mode among TDMA PON;
M TDMA PON mac processor recovers TDMA PON frame from the data of being extracted;
Switch, will carry out multiplexing from the described frame that described M TDMA PON mac processor receives and with multiplexing frame be sent to packet handler; With
Packet handler, from recover ethernet frame or grouping the multiplexing frame, and it is handled.
3. optical transceiver that is used for the TDMA PON OLT system of broadcasting service comprises:
Packet handler determines whether described first data are received as broadcasting, multicast or clean culture based on the header of first data, and adds and be used for determining that the identification code of output port is to produce second data;
Switch duplicates the described second data pre-determined number and according to described identification code described second data is sent to corresponding output port;
M TDMA PON mac processor removes the identification code that adds described second data to and described second data conversion become TDMA PON frame; With
M optical transceiver becomes TDMA PON frame transform light signal and described light signal is sent to ONT.
4. optical transceiver as claimed in claim 3, wherein said first data are one of them of grouped data and ethernet frame data.
5. optical transceiver as claimed in claim 3, wherein said packet handler add described identification code on the reservation header of described first data.
6. it is the data of M TDMA PON mac processor broadcasting that optical transceiver as claimed in claim 3, wherein said switch duplicate by number, and duplicates by transmitting the data of a plurality of TDMA PON mac processor multicast of data to it.
7. optical receiver that is used for the TDMA PON OLT system of broadcasting service comprises:
M optical receiver receives the light signal with burst mode characteristic, and described light signal sends from ONT, and extracts data from described light signal;
M TDMA PON mac processor recovers TDMA PON frame from the data of being extracted;
Switch, the multiplexing TDMAPON frame that recovers; With
Packet handler, from recover one of them of ethernet frame data and grouped data the multiplexing frame.
CN2006100642352A 2005-12-09 2006-12-11 TDMA passive optical network OLT system for broadcast service Expired - Fee Related CN1997238B (en)

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KR1020060029083A KR100723874B1 (en) 2005-12-09 2006-03-30 Tdma passive optical network olt system for broadcast service

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CN102056035B (en) 2013-10-23
KR100723874B1 (en) 2007-05-31
CN1997238A (en) 2007-07-11

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