G-EPON

• GEPON Stands for GIGABYTE ETHERNET PASSIVE OPTICAL NETWORK

• It is basically an interfacing device between an IP NETWORK and an user.

• It uses Layer-2 Protocol.• It involves transmission technologies such as MSTP and ASON .• This network has two major parts such as OLT AND ONT.• OLT Stands for optical line terminal and ONT for optical network

terminal.• It is network which offers broadband services (ADSL2+ and

Ethernet) accessing, VOIP, CATV,IPTV services through OLT.

• Supports not only FTTH, but also FTTB, FTTO/C solution.

NETWORK ARCHITECTURE OF G-EPON

Multiplexer

AN5116-06A

Splitter 1:64

CATV signal source

STM-1

LAN Switch BRAS

GE or 10GE

Base station

PSTN

PC

STB ONU

IPTV CATV Phone

FTTH ONU

PC PC PC

FTTB

TG

Internet IPTV Server Softswitch

IP Network ANM2000

ONU

PC PC

FTTB

Modem

Phone

ONU

SDH

E1 private line service

E1

E1

OPTICAL LINE TERMINATION(OLT)

• Is used together with remote end ONU’s to form GPON/EPON network.

• Meets the demand for FTTH, FTTB, transmission between base stations and TDM private line service.

• Supports 20km long-distance transmission to solve the large-scale fiber access problem.

• Can use a single fiber to provide voice, data video services. broad/narrow band services, net surfing, telephone, fax, IPTV and CATV via one ONU equipment. supports VoIP and can be connected with soft switch network.

• It has large-capacity, high data transfer rate and high-bandwidth access service.

• A single OLT sub rack can hold max 16 xPON service cards and supports up to 4096 ONU’s. It supports random configuration of both TDM and EPON/GPON interface cards..

•It supplies various uplink interfaces, e.g. 10GE optical interfaces, GE (O/E) interfaces, STM-1 and E1 uplink.•OLT has complete management functions, which supports CLI, TELNET and SNMP management modes •The core switch control card, uplink card and power supply card all supports 1+1 hot standby protection. • OLT’s position in the network is shown in Figure

OLT

ONU1

ONU2

ONU3

ONUn

ODN

SNI PON interface PON interface UNI

IP Network

AN5116-06B TDM

CATV

OLT’S FUNCTION AND FEATURES

• 10GE Uplink Port Provides 10GE uplink transmission for GPON/EPON system.• High-density and Non-blocking Design Supports up to 32 PON interfaces and can connect 6400

remote end ONU .• Downlink 2.5Gbit/s GPON Interface GPON interface downlink rate is up to 2.5Gbit/s. It can be

used together with GPON ONU, and supports up to 20km physical access distance.

• Powerful VLAN Functions(virtual local area network) Basic vlan function is to avoid the interference between

the access data and network system management data

• Flexible Triple-Play Solution Adopts WDM Technology to incorporate data, voice,

CATV and IPTV services via ONU and splitter, and sends them into OLT through a single fiber. It converges discrete data network, voice network and CATV network into one network.

• Supports GPON interface bandwidth control, with 64 kbit/s granularity.

• Multi-port-id technology Each ONU supports 32 port-ids at least, which are classified by source MAC address, destination MAC address, source IP address, destination IP address, TCP, UDP, ToS, CoS, Ethernet type and protocol type.

Complete Protection Mechanism

Card redundancy protection Supports uplink card 1+1 protection When uplink cards work in 1+1 protection mode, the ports

of two uplink cards work in one-on-one protection mode

Optical line protection mechanism. Supports end-to-end protection for all optical lines

between OLT and ONU. Dual-fed mode is used . Supports protection for trunk optical line between OLT and

the splitter.

Security and Reliability

• Automatically, and authenticates ONU based on ONU MAC address.

• Supports anti-DOS attack to enhance the anti-attack capability.

OLT’s Service Signal logical Flow

Diagram

Main core

switch card

(HSWA)

Backup core

switch card

(HSWA)

10GE optical interface

Uplink card

(HU1A)

Monitoring

alarm card

(PUBA)

10GE bus

EPON

接口盘

(ET4)

EPON

接口盘

(ET4)

EPON

接口盘

(ET4)

EPON optical interface

EPON interface

card

(EC4B)

EPON 接口盘

(EC2、E2-X) EPON 接口盘

(EC2、E2-X) EPON 接口盘

(EC2、E2-X) GPON

interface card

(GC4B)

To ONU 1.25/2.5Gb/s GPON optical interface

Environment monitor

interface

口盘

(TDM) 接口盘

(TDM)

M)

Main/backup

STM-1 optical

interface

User side

TDM interface

card

(C155A)

To LAN Switch GE optical/electrical

interface

To SDH network

External monitor device

To LAN Switch To ONU

Ethernet interface

card

(GS8F)

Network side

To LAN Switch

PROCESSSING OF UPSTREAM SIGNALS

OLT’S COMPOSITION

• OLT mainly comprises of • Cabinet • Subracks• Cards• Interfaces • Software architecture

CABINET

Outline and DimensionsHeight ×Width

×Depth•

2000mm×600mm×600mm;

• 2200mm×600mm×600mm;

• 2600mm×600mm×600mm.

2000

/220

0/26

00

INTERNAL LAYOUT OF CABINET .

• The alarm unit is at the top of the cabinet, comprising three LED. Red , Yellow &Green.

The red one is urgent alarm LED. When it is ON, major alarm occurs in cards, or power fault occurs in PDP.

The yellow one is non-urgent alarm LED. When it is ON, it indicates minor alarm occurs in cards.

The green LED shows normal functioning.

• PDP is under the alarm unit and over the subrack. Its main functions are as follows:

Imports -48V power supply from power cabinet. Receives alarm signals from subracks and lets the alarm unit indicate alarms.

Exports alarm signals to the superior equipment.

• Subrack is under PDP.

OLT’ssubrack

OLT’ssubrack

SUBRACK

• Subrack has 20 upright slots.

• Slots 1 to 8 and 11 to 18 hold GPON interface cards, TDM interface cards, Ethernet interface cards and IP voice processing cards

• Slots 9 and 10, slightly wider, hold core switch cards.

• Slots 19 and 20 are on the

right of the subrack, designed for uplink cards.

FAN UNIT

• Fan unit is at the top of the subrack

• Mainly used to cool other cards inside the subrack .

• There are three fan units inside each subrack.

• Two LEDs are on the front panel of each fan unit: working LED ACT and alarm LED ALM.

• When a fan unit works normally, ACT LED will be ON.

• When a fan unit is not connected normally, ALM LED will be ON.

• It consumes 15Wof power

Alarm LED ALMWorking

LEDACT

CARDS

Terminology Meaning

HSWA Core Switch Card （ type A ）

HU1A 4×GE +1×10GE Optical Interface Uplink Card

EC4B 4×EPON-C Interface Card （ type B ） GC4B 4×GPON-C Interface Card （ type B ）PUBA Public Card （ type A ）

CE1B 32×E1 Optical Interface Card(CES mode) (type B)

C155A 1×STM-1 Optical Interface Card(CES mode)

GS8F 8×GE Service Card

FCB Fan Control Board

CORE SWITCH CARD (HSWA)

• It is the control card of OLT• Power consumption 40 W• Supports Layer-2 switch;• Supports Layer 2-7 packet classification and filtering;• Supports flexible Q-in-Q VLAN and VLAN translation;• Supports 1+1 protection for uplink card and at the same time supports up to

four GE uplink ports or two 10GE uplink ports; • Supports uplink port mirroring and trunking;• Supports multicast, with IGMP Proxy/Snooping mode and controllable multicast

available; • Supports voice processing via NGN, MGCP, SIP and H.248;• Supports RSTP, so as to avoid network loop; • Supports service priority, and processes user service as per the priority; • Supports DHCP Snooping and DHCP Option 82;• Supports OLT and ONU environment monitor information and alarm information

report; • Supports local, remote, in-band and out-band management modes;• Supports configurations of multiple management VLANs and multiple

management IPs;• Provides one RS-232 interface to connect local CLI network management

system;

EPON INTERFACE CARD EC4B

• It converts EPON data flow from ONU, such as IP data, voice and TDM service, into standard Ethernet data flow, and sends them into OLT’S core switch unit for processing

• Power consumption is 42 W• Its functions are as follows:• The splitting ratio of each EPON interface is 1: 32. • Transmission distance is 20km.• Supports ONU automatic discovery and detection.• Supports ONU pre-authorization and pre-configuration.• Provides ONU software automatic upgrade.

TDM Interface Card C155A

• TDM interface card (C155A) converts TDM data from core switch card into standard STM-1 optical signals and sends them into SDH network.

• Power consumption is of 30 W

• Its functions are as follows:

• Provides one STM-1 optical interface.

• Supports E1 circuit simulation.

• Supports multi-clock mode, with clock optional as per network status.

• Supports hot-swap.

PUBLIC CARD (PUBA)

• Public card (PUBA) provides 14 environment supervision units, and supports hot-swap.

• PUBA CARD consumes 10W of power.

• In the G-EPON it is also used for the VoIP services.

• Environment information of the equipment room is collected by PUBA card

• Interface cards are connected with ONU via ODN.

ETHERNET UPLINK CARD HU1A

• Uplink card sends IP data service and voice service (which should be sent to other devices via NGN) from core switch card into Internet or NGN via uplink optical interface or electrical interface.

• It consumes 15W of power.

• HU1A’s functions are as follows:

• Provides four GE uplink ports and one 10GE uplink port.

• Each uplink port can act as in-band network management interface to connect network management system computer.

• Each uplink port can act as cascade port for equipment cascade.

• Supports hot-swap.

INTERFACE

• PON interface• EPON interface is connected with multiple ONUs via splitter

to import EPON data flow from ONUs into OLT and vice versa.

• PON interface cards convert PON data flow into standard Ethernet data flow and send them to core switch cards via XAUI in the backplane.

• OLT provide EPON interfaces, i.e. uplink 1.25Gbit/s and downlink 1.25Gbit/s for user side.

• EPON card provides four interfaces • Uplink interface• It exports IP data service, NGN voice service and TDM

service from core switch card into Internet, NGN or SDH network and vice versa.

UPLINK INTERFACE

Uplink Interface

RateCard Name

Available Interface

Quantity of a Card

Maximum Access Interface Quantity of Single Subrack

Ethernet optical port

1000 Mbit/s HU1A 4 8

10000 Mbit/s HU1A 1 2

STM-1 optical interface

155.52 Mbit/s C155A 1 2

E1 interface 2.048 Mbit/s CE1B 32 64

POWER INTERFACE

• This equipment adopts distributed power supply mode.

• The power interface of OLT provides -48V DC input for subracks.

• There are Two power interfaces are on the subrack.

• These two power interfaces form dual-power parallel access and supply independent power to each card.

MANAGEMENT INTERFACE

• Management interface connects OLT and network management system computer. It supports CLI, GUI, in-band and out-band management modes

MANAGEMENT INTERFACE

Network Management System Interface

Type CardAvailable Interface Quantity of a Card

Out-band network management system interface

FE electrical interface HSWA 1

EMS interface NA 1

In-band network management system interface

GE optical interface HU1A 4

10GE optical interface HU1A 1

CLI local interface RS-232 HSWA 1

AUXILIARY INTERFACE

• OLT also has three types of auxiliary interfaces, which monitor the environment, collect equipment alarms and connect out-band network management system

AUXILIARY INTERFACE

Auxiliary InterfaceAbbreviation

Maximum Quantity for

Single Subrack

Environment monitor interface ESC 1

Alarm interface ALM 1

Out-band network management system interface

EMS 1

EPON ADVANTAGES• EPON adopts single-fiber WDM technology.

• It utilizes 1310nm for upstream, 1490nm for downstream and 1550nm for CATV signal.

• And with only one OLT and one trunk fiber, TDM, IP data and

CATV signals can be transmitted simultaneously up to 20km.

• The signals from each PON port of OLT can be distributed to multiple ONUs through ODN. This greatly reduces the cost on OLTs and trunk optical fibers.

• There are only passive optical devices such as optical fibers and optical splitters between OLT and ONU, and there is no need for machine room, power supply or maintenance engineer for them.

•EPON adopts Ethernet transmission method, which is also the main method used by user LAN and resident network. This decreases the cost due to the complex conversion between transmission protocols.

•Both upstream and downstream supports gigabit transmission. The downstream realizes bandwidth share through broadcast transmission with encryption.