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GPON –Fundamentals -- Technical Team from FTTH Marketing Department
Overview of Optical Access Network Analysis of GPON Standards Contents GPON Key Technologies GPON Management and Service Provisioning Basic Concepts of PON Basic Services over GPON Network
Basic Concepts of PON This chapter describes the basic concepts and working principle of  PON network. After reading it, you will have a preliminary understanding on the PON network. This chapter introduces the basic architecture, upstream and downstream working principle of the PON network.
What is PON? P assive  O ptical  N etwork OLT ONU O ptical  L ine  T erminal  O ptical  N etwork  U nit  P assive  O ptical  S plitter   PSTN Internet CATV ONU ONU ,[object Object],[object Object],[object Object],P assive  O ptical  S plitter
Why GPON? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],<1Mbps 3M 8M 25M 100M ADSL/ADSL2+ Copper Based VDSL / ADSL2+ Copper Based PON Fiber Based 2002 2003 2006 2010 Time BD Internet Video conferencing Remote control Access Technology Service requirements VoD HDTV Game Live TV VoD HDTV <3km <2km <1km ~5km Coverage diameter
Concepts APON : ATM Passive Optical Networks  EPON : Ethernet Passive Optical Networks GE-PON : Giga-bit Ethernet Passive Optical Networks GPON : Gigabit-capable Passive Optical Networks
GPON Principle----Data Multiplexing ,[object Object],[object Object],[object Object],[object Object],[object Object],1490nm 1310nm
GPON Principle----Downstream Data ,[object Object]
GPON Principle----Upstream Data ,[object Object]
Comparison Between GPON and EPON Ethernet GEM/ATM Data encapsulation mode 8B/10B NRZ Line encoding Pure data service Multi-service/ FTTx Application mode Enterprise Intranet Carriers Choice of carriers Px10/Px20 Class A/B/C Power budget Weak, extended by vendors powerful OAM Small vendors involved Large vendors involved Maturity RTT Equalized logical reach by adjusting EqD Ranging 72% 92% Broadband efficiency Defined by vendors Standard format DBA None OMCI ONT interconnectivity CESoP CESoP / Native TDM support 1:16~1:32 1:64~1:128 Split ration 1.25G/1.25G 2.488G/1.244G Rate IEEE ITU.T Standard EPON GPON
Overview of Optical Access Network This chapter describes the architecture of the optical  access network. After reading it, you will have a understanding on the FTTx network.  Besides, this chapter describes various devices applied in the FTTx  network and you can get a knowledge of those devices applied in the  optical access network.
CO Curb Customer Premise BA FTTC FTTB OLT OLT Architecture of Optical Access Network DSLAM 250-700m Urban Coverage 3.5-5km Remote Business xDSL 2~20Mbps OLT FTTH ODN MDU ONT ONU Optical Line Termination Optical Networks Termination Optical Networks Unit Multi-Dwelling Unit 2.5Gbps  Down   /1.25Gbps  Up 2.5Gbps  Down   /1.25Gbps  Up 2.5Gbps  Down   /1.25Gbps  Up
From the architecture diagram, the optical access network comprises the following scenarios: 1. FTTB scenario As an access scenario for business users, Fiber to The Business (FTTB) scenario falls into single business unit  (SBU) and Business Multi-tenant unit (MTU) in terms of capacity . Of them, SBU provides a comparatively small number of ports, including following types: POTS, 10/100/1000BASE-T, RF(33dBmV), and DS1/T1/E1 ports; MTU provides a comparatively larger number of ports, including following types: POTS, 10/100/1000BASE-T, RF and DS1/T1/E1 ports. 2. FTTC & FTTCab scenario As an access to the curb or the cabinet over fibre,  Fiber to The Curb& Fiber to The Cabinet (FTTC & FTTCab) scenario  is for the  Multi-dwelling unit (MDU), providing a comparatively larger number of ports, including following types: 10/100/1000BASE-T, RF(33dBmV), VDSL2, and so on.  3. FTTH scenario As an access to the home over fibre, Fiber to The Home (FTTH ) scenario is mainly for the single family unit  ( SFU), providing a comparatively small number of ports, including following types: POTS, 10/100/1000BASE-T, and RF(18dBmV). What is Optical Access Network?
Analysis of GPON Standards This chapter analyses major GPON standards. After reading it, you will have a understanding on the module reference, performance, frame structure, as well as basic terms of GPON network, such as GEM, port and T-CONT.
GPON Standards ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],ITU-T G-984.1/2/3/4 Simple development process Powerful compatibility ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
GPON Network Model Reference WDM ONU/ONT NE WDM OLT NE Service node Optical splitter T reference point V reference point R/S S/R ODN UNI SNI IFpon IFpon ONU  Optical Network Unit ONT  Optical Network Terminal ODN  Optical Distribution Network OLT  Optical Line Terminal WDM  Wavelength Division Multiplex Module NE  Network Element SNI  Service Node Interface UNI  User Network Interface
Basic Performance Parameters of GPON ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
GPON Network Protection Mode IFpon IFpon IFpon 1 : N optical splitter OLT ONU#1 ONU#N Secondary fibre Type A  Fibre backup IFpon IFpon IFpon 2 : N optical splitter OLT ONU#1 ONU#N Type B  OLT interface backup IFpon    ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],   Protected area Protected area
IFpon IFpon IFpon 2 : N optical splitter OLT ONU#1 ONU#N Type C  All-backup IFpon IFpon IFpon 2 : N optical splitter GPON Network Protection Mode ,[object Object],[object Object],[object Object],[object Object],[object Object],   Whole-network protection
IFpon IFpon IFpon 2 : N optical splitter OLT ONU#1 ONU#N Type D  Mixed backup IFpon IFpon 2 : N optical splitter 1 : 2 optical splitter 1 : 2 optical splitter GPON Network Protection Mode ,[object Object],[object Object],[object Object],[object Object],Whole-network protection Protected area of ONUs with a single port
GPON Multiplexing Architecture ,[object Object],[object Object],[object Object],[object Object],[object Object],IFpon O N U O N U O N U T-CONT Port T-CONT Port Port T-CONT T-CONT Port Port Port Port Port ONU-ID identifies ONUs Alloc-IDs identifies T-CONTs Port-ID identifies GEM ports OLT ONT T-CONT T-CONT GEM Port GEM Port
OLT Functional Blocks PON interface function PON interface function PON TC function PON TC function Cross Connection function Service  adaptation Service adaptation PON Core Shell Cross Connect Shell Service Shell ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ONU/ONT Functional Blocks PON interface function PON interface function PON TC function PON TC function Service adaptation Service adaptation PON Core Shell Service Shell MUX/ DEMUX ,[object Object]
Physical Control Block Downstream (PCBd) Payload AllocID Start End AllocID Start End 1 100 200 2 300 500 T-CONT1 (ONT 1) T-CONT 2 (ONT 2) Slot  100 Slot  200 Slot  300 Slot  500 PLOu PLOAMu PLSu DBRu Payload x DBRu Y Payload y Upstream  Bandwidth Map 125us Downstream Framing Upstream Framing OLT ONT64 ONT1 GPON Frame Structure ,[object Object]
PLOu PLOAMu PLSu DBRu x Payload x DBRu y Payload y PLOu DBRu z Payload z Preamble A bytes Delimiter B bytes BIP 1 bytes ONU-ID 1 bytes Ind 1 bytes ONU ID Msg ID 1 bytes Message 10 bytes CRC 1 bytes DBA  1,2,4bytes CRC 1 bytes DBA Report Pad if needed GEM header Frame fragment GEM header Full  frame GEM header Frame fragment PLI Port ID PTI HEC ONT A ONT B Upstream Framing GPON Upstream Frame Structure ,[object Object]
PCBd n Payload n PCBd n + 1 Payload n Psync 4 bytes Ident 4 bytes Reserved 13 bytes BIP 1 bytes Plend 4 bytes Plend 4 bytes US BW Map N*8 bytes FEC Ind 1 bit Reserved 1 bit Super-frame  Counter 30 bits Blen BW Map Length 12 bits Alen ATM Partition Length 12 bits CRC 8 bits Access 1 8 bytes Access 2 8 bytes … .. Access n 8 bytes Alloc ID 12 bits Flags 12 bits SStart 2 bytes SStop 2 bytes CRC 1 byte Send PLS 1 bit Send PLOAMn 1 bit Use FEC 1 bit Send DBRu 2 bits Reserved 7 bits 125us Coverage of this BIP Coverage of next BIP Downstream Framing GPON Downstream Frame Structure ,[object Object]
TDM TDM data Payload TDM fragment HEC PTI Port ID PLI GEM Frame Ingress buffer TDM Buffer Mapping of TDM Service in GPON ,[object Object],[object Object],[object Object]
Mapping of Ethernet Service in GPON ,[object Object],[object Object],[object Object],GEM  Payload CRC PTI Port ID PLI GEM Frame Ethernet Packet DA SFD Preamble Inter packet gap SA Lengthype MAC client data FEC EOF 5 bytes
GPON Key Technologies This chapter describes GPON key technologies. After reading it, you will have a understanding on key technologies of GPON, such as ranging, equalization delay (EqD), dynamic bandwidth assignment (DBA), QoS and optical power.
GPON Key  Technologies ---- Burst  Optical/Electric Technology Continuous transmitting units Burst transmitting units ,[object Object],[object Object],Burst receiving units Continuous transmitting units 0# ONT 0# ONU 1# ONU 0# ONU 1# ONU 0# ONT 0# ONU 1# ONU 0# ONT Fast AGC receiving Non- fast AGC receiving Threshold line Signals sent from ONT/ONU Signals arrive at OLT and threshold is specified Data recovered
GPON Key  Technologies - ---Ranging ,[object Object],[object Object],ONU3 ONU2 ONU1 OLT
DBA ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DBA Working Principle ,[object Object],[object Object],[object Object],SLA: Service - Level Agreement BW: Bandwidth Maximum: maximum bandwidth Guaranteed: guaranteed bandwidth Minimum: minimum bandwidth
T-CONT  Bandwidth Terms ,[object Object],[object Object],[object Object]
Relationship Between T-CONT Type and Bandwidth Type ,[object Object],[object Object],[object Object],[object Object]
DBA Operation Modes on ONU ( a ) There are four T-CONT types on ONUs  ( b ) There is only Type5 T-CONT on ONUs ,[object Object],[object Object],[object Object]
DBA Operation Process ,[object Object],[object Object],DBA algorithm logic DBA report BW Map Time slot T-CONT T-CONT T-CONT Scheduler ONU OLT Control platform Data platform
Two DBA Operation Modes ,[object Object],[object Object],[object Object],[object Object],[object Object],Payload US BW Map Data Report PCBd D/S Direction U/S Direction OLT ONT ① ② ③ ④
NSR-DBA Operation NSR is an algorithm scheme that realizes DBA. It helps to predict the bandwidth allocated to each ONU based on the traffic from ONUs. Procedure: Step1: Monitor the number of cells received by OLT within the specified interval. Step2: Use the result of real time monitoring in step 1 to calculate the utilization rate. Step3: Recognize the congestion status by comparing the utilization rate with the specified limits.  ,[object Object],D t i j Di Dj
QoS Mechanism of ONU in GPON ,[object Object],[object Object],[object Object],GPON VOIP VOD DATA TDM Traffic-flow Scheduling  And buffer  control Service differentia based on 802.1p GPON VOIP VOD DATA TDM Traffic-flow Scheduling  And buffer  control Service differentia based on 802.1p OLT Splitter Service traffic based on GEM Port-id
QoS Mechanism of OLT in GPON VOIP BTV DATA TDM GPON GPON GE/10GE Upstream service traffic based on different VLANs Ethernet bridging Non-blocking switching 802.1p COS Queuing & scheduling DBA TDM Gateway PSTN BSR OLT ,[object Object],[object Object],[object Object],[object Object]
AES Encryption in GPON End User 1 End User 3 ONT End User 2 3 3 1 1 2 ONT ONT OLT Encryption Decryption Decryption Decryption 1 ,[object Object],[object Object],[object Object],[object Object],AES: Advanced Encrypt System A globally-used encryption algorithm 1 3 3 2 1 1 1 3 3 2 1 1 1 3 3 2 1 1 1 3 3 2 1 1
FEC ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],Optical Power Attenuation Input Output 1:2  optical splitter 2:N  optical splitter ∵   10 log(0.5) = - 3.01 ∴ Attenuation of 1:2 splitter: 3.01 dB  Attenuation of 1:16 splitter: 12.04 dB  Attenuation of 1:64 splitter :18.06 dB Input Output
Fibre Attenuation and Power Budget ,[object Object],[object Object],[object Object],[object Object],[object Object],About 0.35 dB per km for 1310,1490nm Huawei’s OLT and ONU 28 dB (Class B+) 30 dB 15 dB Class C NOTE – The requirements of a particular class may be more stringent for one system type than for another, e.g. the class C attenuation range is inherently more stringent for TCM systems due to the use of a 1:2 splitter/combiner at each side of the ODN, each having a loss of about 3 dB. 28 dB 25 dB 20 dB Maximum loss 13 dB 10 dB 5 dB Minimum loss Class B + Class B Class A Table G.984.2 – Classes for optical path loss
Parameters of GPON Interfaces (Class B+) 0.5 dB ,[object Object],-8 dBm ,[object Object],-27 dBm ,[object Object], 5 dBm ,[object Object],0.5 dBm ,[object Object],ONU ONU:  0.5 dB ,[object Object],-8 dBm ,[object Object],-28 dBm ,[object Object], 5 dBm ,[object Object],+1.5 dBm ,[object Object],OLT OLT:  Single fibre Unit Items
GPON Management and Service Provisioning This chapter describes GPON management and service provisioning. After reading it, you will have a understanding on OMCI ( the management and maintenance message type ) and ONT service implementation.
OAM message at the physical layer falls into three types:  embedded OAM, PLOAM and OMCI . Basic Message Types in GPON Management ,[object Object],[object Object],[object Object]
GPON  System Management Mode OLT BRAS iManager N2000 BMS OMCI SNMP ACS TR069 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Client ONT
GPON Service Provisioning and Zero Configuration on Terminals Carriers’ nightmare  Application scenario Service Provisioning NMS  2000 Access Network Billing 2 Configure service network 3 Order Management Start up ONT and make registration with serial number ONT ONT ONT ONT CRM User Send terminals to users 1 2 Finish the auto-configuration of OLT Initial configurations (such as service system information configuration, data configuration)  are required on terminals and then they can be put into use. To finish these configurations, it is not cost-effective to carriers. GPON supports zero configuration on terminals and plug-and-play of terminals, which is cost-effective.  Flexible Configuration plan of GPON STB 3 Use OMCI to finishing data configuration on ONT 1 Subscribe for services
VOIP Service Management Solution in GPON SoftX3000 Service Provisioning IADMS Access Network CRM Billing UMS 1 Subscribe for services 2 Configure SoftX 3 Configure IADMS Activation code generator 4 Generating activation code User 5 Send activation code and terminal to users Phone Phone Phone Phone Order Management 6 Input activation code 7 Configure terminals automaticallythroughTR069 Maintenance personnel use activation code generator to generate terminal activation code (including IADMS IP, PPPoE user name and password).  Users input activation code on terminals, terminals register on IADMS upon power-up and the IADMS makes auto-configuration on terminals. Basic operation and maintenance process Description Process and Networking ONT ONT Service provisioning Terminal activation Daily management
Basic Services over GPON Network This chapter describes basic services provided by GPON  System, such as Triple-play, TDM and RF overlay services.
ASP/ISP CPE MSE Ethernet OLT Softswitch NMS TL1/CORBA /API BB service platform Carrier’s OSS Notification Triple Play Solution in GPON  Phone PC SBU NSP CBU E1 FE ODN Splitter Base station BRAS AAA Server IP Core Internet VoD Server Middle ware IPTV Phone PC SFU CPE MDU VDSL IP Voice
TDM  Service Solution in GPON  ONT OLT CO LE Splitter ONT BUSINESS PBX PBX E1/T1 ODN E1/T1 E1/T1 FE PSTN CESoP mode Native mode ,[object Object],[object Object],[object Object],[object Object],ONT
RF Overlay Service Solution in GPON  EDFA ( Erbium Doped Fiber Amplifier ) Optical Couplers ( WDM ) OLT (Optical Line Terminal) ONU (Optical Network Terminal) Central Office Video 1550nm Voice/Data& Video 1490/1310nm , 1550nm Voice/Data Downstream 1490nm Upstream  1490nm Customer Premises Optical Splitter Video ( RF ) IP Voice and Data @1250Mbps Voice and Data @2500Mbps Video Analog TV Digital TV HD/VOD 42Mhz 550Mhz 860Mhz Upstream Downstream 1310nm 1490nm 1550nm
 

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Gpon Fundamentals

  • 1. GPON –Fundamentals -- Technical Team from FTTH Marketing Department
  • 2. Overview of Optical Access Network Analysis of GPON Standards Contents GPON Key Technologies GPON Management and Service Provisioning Basic Concepts of PON Basic Services over GPON Network
  • 3. Basic Concepts of PON This chapter describes the basic concepts and working principle of PON network. After reading it, you will have a preliminary understanding on the PON network. This chapter introduces the basic architecture, upstream and downstream working principle of the PON network.
  • 4.
  • 5.
  • 6. Concepts APON : ATM Passive Optical Networks EPON : Ethernet Passive Optical Networks GE-PON : Giga-bit Ethernet Passive Optical Networks GPON : Gigabit-capable Passive Optical Networks
  • 7.
  • 8.
  • 9.
  • 10. Comparison Between GPON and EPON Ethernet GEM/ATM Data encapsulation mode 8B/10B NRZ Line encoding Pure data service Multi-service/ FTTx Application mode Enterprise Intranet Carriers Choice of carriers Px10/Px20 Class A/B/C Power budget Weak, extended by vendors powerful OAM Small vendors involved Large vendors involved Maturity RTT Equalized logical reach by adjusting EqD Ranging 72% 92% Broadband efficiency Defined by vendors Standard format DBA None OMCI ONT interconnectivity CESoP CESoP / Native TDM support 1:16~1:32 1:64~1:128 Split ration 1.25G/1.25G 2.488G/1.244G Rate IEEE ITU.T Standard EPON GPON
  • 11. Overview of Optical Access Network This chapter describes the architecture of the optical access network. After reading it, you will have a understanding on the FTTx network. Besides, this chapter describes various devices applied in the FTTx network and you can get a knowledge of those devices applied in the optical access network.
  • 12. CO Curb Customer Premise BA FTTC FTTB OLT OLT Architecture of Optical Access Network DSLAM 250-700m Urban Coverage 3.5-5km Remote Business xDSL 2~20Mbps OLT FTTH ODN MDU ONT ONU Optical Line Termination Optical Networks Termination Optical Networks Unit Multi-Dwelling Unit 2.5Gbps Down /1.25Gbps Up 2.5Gbps Down /1.25Gbps Up 2.5Gbps Down /1.25Gbps Up
  • 13. From the architecture diagram, the optical access network comprises the following scenarios: 1. FTTB scenario As an access scenario for business users, Fiber to The Business (FTTB) scenario falls into single business unit (SBU) and Business Multi-tenant unit (MTU) in terms of capacity . Of them, SBU provides a comparatively small number of ports, including following types: POTS, 10/100/1000BASE-T, RF(33dBmV), and DS1/T1/E1 ports; MTU provides a comparatively larger number of ports, including following types: POTS, 10/100/1000BASE-T, RF and DS1/T1/E1 ports. 2. FTTC & FTTCab scenario As an access to the curb or the cabinet over fibre, Fiber to The Curb& Fiber to The Cabinet (FTTC & FTTCab) scenario is for the Multi-dwelling unit (MDU), providing a comparatively larger number of ports, including following types: 10/100/1000BASE-T, RF(33dBmV), VDSL2, and so on. 3. FTTH scenario As an access to the home over fibre, Fiber to The Home (FTTH ) scenario is mainly for the single family unit ( SFU), providing a comparatively small number of ports, including following types: POTS, 10/100/1000BASE-T, and RF(18dBmV). What is Optical Access Network?
  • 14. Analysis of GPON Standards This chapter analyses major GPON standards. After reading it, you will have a understanding on the module reference, performance, frame structure, as well as basic terms of GPON network, such as GEM, port and T-CONT.
  • 15.
  • 16. GPON Network Model Reference WDM ONU/ONT NE WDM OLT NE Service node Optical splitter T reference point V reference point R/S S/R ODN UNI SNI IFpon IFpon ONU Optical Network Unit ONT Optical Network Terminal ODN Optical Distribution Network OLT Optical Line Terminal WDM Wavelength Division Multiplex Module NE Network Element SNI Service Node Interface UNI User Network Interface
  • 17.
  • 18.
  • 19.
  • 20.
  • 21.
  • 22.
  • 23.
  • 24.
  • 25.
  • 26.
  • 27.
  • 28.
  • 29. GPON Key Technologies This chapter describes GPON key technologies. After reading it, you will have a understanding on key technologies of GPON, such as ranging, equalization delay (EqD), dynamic bandwidth assignment (DBA), QoS and optical power.
  • 30.
  • 31.
  • 32.
  • 33.
  • 34.
  • 35.
  • 36.
  • 37.
  • 38.
  • 39.
  • 40.
  • 41.
  • 42.
  • 43.
  • 44.
  • 45.
  • 46.
  • 47. GPON Management and Service Provisioning This chapter describes GPON management and service provisioning. After reading it, you will have a understanding on OMCI ( the management and maintenance message type ) and ONT service implementation.
  • 48.
  • 49.
  • 50. GPON Service Provisioning and Zero Configuration on Terminals Carriers’ nightmare Application scenario Service Provisioning NMS 2000 Access Network Billing 2 Configure service network 3 Order Management Start up ONT and make registration with serial number ONT ONT ONT ONT CRM User Send terminals to users 1 2 Finish the auto-configuration of OLT Initial configurations (such as service system information configuration, data configuration) are required on terminals and then they can be put into use. To finish these configurations, it is not cost-effective to carriers. GPON supports zero configuration on terminals and plug-and-play of terminals, which is cost-effective. Flexible Configuration plan of GPON STB 3 Use OMCI to finishing data configuration on ONT 1 Subscribe for services
  • 51. VOIP Service Management Solution in GPON SoftX3000 Service Provisioning IADMS Access Network CRM Billing UMS 1 Subscribe for services 2 Configure SoftX 3 Configure IADMS Activation code generator 4 Generating activation code User 5 Send activation code and terminal to users Phone Phone Phone Phone Order Management 6 Input activation code 7 Configure terminals automaticallythroughTR069 Maintenance personnel use activation code generator to generate terminal activation code (including IADMS IP, PPPoE user name and password). Users input activation code on terminals, terminals register on IADMS upon power-up and the IADMS makes auto-configuration on terminals. Basic operation and maintenance process Description Process and Networking ONT ONT Service provisioning Terminal activation Daily management
  • 52. Basic Services over GPON Network This chapter describes basic services provided by GPON System, such as Triple-play, TDM and RF overlay services.
  • 53. ASP/ISP CPE MSE Ethernet OLT Softswitch NMS TL1/CORBA /API BB service platform Carrier’s OSS Notification Triple Play Solution in GPON Phone PC SBU NSP CBU E1 FE ODN Splitter Base station BRAS AAA Server IP Core Internet VoD Server Middle ware IPTV Phone PC SFU CPE MDU VDSL IP Voice
  • 54.
  • 55. RF Overlay Service Solution in GPON EDFA ( Erbium Doped Fiber Amplifier ) Optical Couplers ( WDM ) OLT (Optical Line Terminal) ONU (Optical Network Terminal) Central Office Video 1550nm Voice/Data& Video 1490/1310nm , 1550nm Voice/Data Downstream 1490nm Upstream 1490nm Customer Premises Optical Splitter Video ( RF ) IP Voice and Data @1250Mbps Voice and Data @2500Mbps Video Analog TV Digital TV HD/VOD 42Mhz 550Mhz 860Mhz Upstream Downstream 1310nm 1490nm 1550nm
  • 56.  

Notas do Editor

  1. Good morning/afternoon, ladies and gentlemen. I’m very glad to have a chance to introduce GPON technology to you. Huawei provides this solution based on fixed network consolidation and migration. Why will we talk about the fixed network consolidation and migration?
  2. IN brief the EM’s features cover the full FCAPS areas and we of course also provide this functionality both as a GUI and northbound integration capability.
  3. 最大逻辑距离:就是不考虑设备本身硬件处理时延,光纤传输时延等因素的情况下的最大传输距离。 最大物理距离:就是实际的传输距离 最大距离差:就是不同的 ONU 距离 OLT 设备的距离差
  4. 1.In GPON, downstream frames are transmitted in a broadcast manner with a fixed length of 125us. Same downstream data arrives at all ONUs and then each ONU filters the incoming data based on ONU-ID. 2.In GPON, upstream frames are transmitted in the TDMA manner. The uplink is divided into time slots and the time slots are allocated to ONUs according to the BWmap field in GPON upstream frames. In this way, all ONUs can transmit data in a certain order and no collision occur. Each frame has 9120 time slots. 3.In GPON, T-CONT is introduced to the uplink. T-CONT is a container that carries data, similar to the VC in the SDH. Data are transmitted through the particular T-CONTs. T-CONT eases bandwidth allocation and facilitates dynamic bandwidth
  5. 1.In GPON, upstream frame comprises these fields: PLOu, PLOAMu, PLSu, DBRu, and Payload. The following describes the meanings of these fields: PLOu: Physical layer overhead Upstream. It is for frame location, synchronization and identifies which ONU the frame belongs to. PLOAMu: The PLOAMu field reports maintenance and management status of ONUs. (Not all frames contains this field. Whether to send the field is negotiable.) DBRu: The DBRu field mainly reports the status of T-CONTs. To apply for bandwidth for the next, the field completes the dynamic bandwidth assignment to ONUs. (Not all frames contains this field. Whether to send the field is negotiable.) Payload: The payload of the data. It could be either DBA status report or data frame. If it is the data frame, it consists of GEM header and Frame. GEM header: The GEM header identifies data of different GEM ports. GEM port is the minimum unit for transmitting data in GPON, similar to the PVC in the ATM. Each type of service traffic corresponds to GEM ports, and the GEM port corresponds to T-CONTs. GEM header is divided into PLI, Port ID, PTI and HEC. The meanings of theses parts are as follows: PLI: it indicates the length of the payload. Port ID: it uniquely indicates a GEM port. PTI: it identifies the payload type, mainly identifying the status and type of the data that is currently being sent, such as whether it is the OAM message, or whether the data is transmitted completely. HEC: It provides Forward Error Correction (FEC) and ensures transmission quality.
  6. In GPON, downstream frame comprises PCBd and Payload fields. The PCBd is mainly the physical control block, providing frame location, synchronization and bandwidth allocation functions. The Payload is mainly used for loading downstream data. Each frame may consists multiple units. PCBd: It contains the synchronization field, identifying whether to enable the FEC algorithm. The PCBd field is mainly used for the upstream bandwidth allocation to enhance the bandwidth utilization. Of the US BW Map field, AllocID identifies the serial number of T-CONTs; SStart and SStop indicates the number of time slots for starting and stopping transmission respectively; CRC is the parity bit.
  7. in 2004, Huawei cooperate with NEUF telecom in France establish world’s first commercial triple play network, which by now, is becoming world’s biggest triple play network provide multi-service for 1,700, 000 customers. In 2006, reference to this successful application, DSL Forum publish it’s TR-101, try to standardize the triple play service.
  8. That’s all for my presentation, any questions is welcome.