Fttx arcitectures

GPON Architecture _ Training outline
• GPON access
• GPON specifications
• Reference Standards and Protocols
• Huawei Product Availability
• System principle
• Activation in GPON
• GPON Terminal
• FTTx Scenario
• Brief Configuring

GPON Access
Introduction
This topic describes the definition and purpose of GPON access.
Definition
An x passive optical network (xPON) is a point-to-multipoint (P2MP) passive optical
network. A typical xPON access system consists of three parts:
- Optical line terminal (OLT)
- Optical network unit (ONU) or optical network termination (ONT)
- Optical distribution network (ODN)
An ODN (including fibers and optical splitters) connects the OLT and the ONU/ONT.

GPON Access
Purpose
GPON adopts the passive optical transmission technology and is mainly applicable to
the scenarios, such as fiber to the home (FTTH) and fiber to the building (FTTB) to provide
various services:
• Voice
• Data
• Video
• Leased line
• Distributed service
GPON supports high-bandwidth transmissions. This helps to break down the
bandwidth bottleneck of the access over twisted pair cables and to meet the requirements
for high-bandwidth services, such as high-definition TV (HDTV) and live programs.
GPON supports long-reach access, which helps to extend the coverage and to reduce
network nodes

Training outline
• GPON access
• Huawei Product Availability
• GPON Terminal
• FTTx Scenario

GPON Specifications
This topic provides the specifications of the GPON access feature.
The GPON access feature supports the following specifications:
• The system supports the service shelf to be fully configured with the GPBC/GPBD
boards.
• Each GPBC board supports four GPON ports, each GPBD board supports eight GPON
ports.
• The entire GPON board supports 8K service ports.
• Each GPON port of the GPBC board supports up to 64 ONUs/ONTs, and each GPON port
of the GPBD board supports up to 128 ONUs/ONTs. The system supports up to 6144
ONUs/ONTs.
• The system supports the GEM (GPON Encapsulation Method) encapsulation. Each
GPON port supports 4096 GEM ports. (The range of GEM port number that can be
configured is from 128 to 3999. The others are reserved by the system.)
• Each GPON board supports up to 8192 GEM ports.
• Each PON port of the GPBC board supports up to 256 T-CONTs, and Each PON port of
the GPBD board supports up to 1024 T-CONTs.
• Each PON port of the GPBC board supports up to 256 Non-Fix T-CONTs, and Each PON
port of the GPBD board supports up to 512 Non-Fix T-CONTs.

GPON Specifications
• The system supports up to 512 T-CONT profiles and supports up to 32K T-CONTs.
• The GPON port supports a maximum downstream rate of 2.4 Gbit/s and upstream rate
of 1.2 Gbit/s.
• The system supports a maximum 1:128 split ratio and supports Class B+ (28 dB).
• The system supports a maximum physical transmission distance of 20 km and a
maximum logical transmission distance of 60 km.
• The GPON board supports the query of the CPU usage.
• The system supports the loopback on the ETH port and the E1 port of the ONT.
• The system supports the loopback on the GEM port of the OLT and the ONT.
• The system supports the loop line detection for the remote GEM port and the line
detection for the ONT UNI port.
• The system can automatically allocate GEM port IDs.
• The system supports the configuration of the static routing for the GPON MDU.
• The system supports the query of the alarm information about a PON port of the GPON
board through the CLI.
• The system can report the SN of a newly discovered ONT when the PON port is fully
configured with 64 (in the case of the GPBC board)/128 (in the case of the GPBD board)
ONTs.

Reference Standards and Protocols
The following lists the reference documents of GPON access:
• ITU-T G.984.1 General characteristics for Gigabit-capable Passive Optical Networks
(GPON)
• ITU-T G.984.2 Gigabit-capable Passive Optical Networks (GPON): Physical Media
Dependent (PMD) layer specification
• ITU-T G.984.3 Gigabit-capable Passive Optical Networks (GPON): Transmission
convergence layer
• ITU-T G.984.4 Gigabit-capable Passive Optical Networks(GPON): ONT management and
control interface specification

Training outline
• GPON access
• Product Availability
• GPON Terminal
• FTTx Scenario

Availability
License Support
The number of remote ONT ports supported by the MA5603T is under
license. Therefore, the license is required for accessing the corresponding service
Version Support Product
Product MA5603T
Version V800R007
Hardware Support
- The GPBC/GPBD board supports the feature of GPON access.
- The terminals support GPON upstream transmission.

System principle
• GPON adopts the WDM transmission over an optical fiber. In compliance with ITU-T
G.984.2, the upstream wavelength is 1310 nm, and the downstream wavelength is 1490
nm, which are used for bi-directional data transmissions over an optical fiber between
the OLT and the ONUs/ONTs ,to separate the signals of different users at both directions
over the same optical fiber, the following multiplexing technologies are adopted:
The broadcast technology is adopted for downstream data stream. Each ONU/ONT receives only the
data which belongs to it. The transmission rate is 2.4 Gbit/s.
The TDMA technology is adopted for upstream data stream. Each ONU/ONT sends its data within the
allocated timeslots. The transmission rate is 1.2 Gbit/s.

Principle
• A GPON consists of the physical layer, the TC framing sub-layer, and the TC encapsulation
adaptation layer.
• When functioning as an OLT, the MA5603T is connected to the ONU/ONT in the downstream
direction. The GPON encapsulation mode (GEM) frames are transmitted between the OLT
and the ONU/ONT. A GEM frame is identified by the GEM port ID, and is carried by T-CONT in
the upstream direction
Figure 1 GPON multiplexing structure (GEM mode)

Principle
DBA-profile Function
• This command is used to add a dynamic bandwidth assignment (DBA) profile. In the DBA
profile, the upstream access bandwidth of the ONU is defined. The MA5600T dynamically
adjusts the upstream access bandwidth allocated to the ONU according to the upstream
access bandwidth requirements of the ONU. In this manner, the usage efficiency of the
upstream access bandwidth of the PON system is improved. When the default DBA profile
cannot meet the service requirements, run this command to add a DBA profile according to
the service requirements.
• The default DBA profiles can be queried or modified, but cannot be deleted. If a profile is
bound to a service, the profile cannot be deleted.
• Priorities of different bandwidth types are different. When allocating the bandwidth, the
board allocates the fixed bandwidth and then the assured bandwidth. In this manner, the two
bandwidth types are assured. If there is still bandwidths remaining, the remaining
bandwidths are allocated to other bandwidth types.
• The value of the bandwidth you entered when adding the DBA profile will be adjusted
downward to an integer multiple of 64. For example, if the entered bandwidth value is 1022
kbit/s, the actual bandwidth will be 960 kbit/s.

Principle
DBA-profile Function Link
By default, there are nine DBA profiles in the system with IDs ranging from 1 to 9. These profiles
provide the typical traffic parameter values. For parameters in the nine DBA profiles, see the following
figure. You can also run the display dba-profile command to query the parameters in each profile. The
DBA profiles used in the EPON mode and in the GPON mode are the same. A DBA profile can be bound to
the EPON port and GPON port at the same time.

Principle
Assume that:
• Profile ID: 20
• Profile name: dba_15M (that is, dba_assured bandwidth)
• Bandwidth type: Type3
• Assumed bandwidth: 15 Mbit/s
• Maximum bandwidth: 30 Mbit/s
• To add such a DBA profile for a VoIP service so that the MA5600T dynamically adjusts the
bandwidth allocated to the service according to the upstream burst service requirements of
the ONU, do as follows:

Principle
GEM Port
• A T-CONT comprises one or more GEM ports. Each GEM port carries one type of service
stream. Thus, one T-CONT can carry one or more types of service streams.
• Each GEM port is identified by a unique Port-ID. The Port-ID ranges from 0 to 1023 and is
globally allocated by the OLT. That is, each GEM port can be used by only one ONU/ONT
connected to the OLT.
• The GEM port is used to identify the service port that carries the service stream between the
OLT and the ONU/ONT. It is similar to the VPI/VCI of the ATM connection.

Activation in GPON
• The activation process in GPON is controlled by the OLT. The ONU responds to the messages
sent by the OLT.
The activation process is as follows:
1. According to the requirement of the OLT, the ONU adjusts the level of the transmit optical
power.
2. The OLT discovers the SN (Serial Number) of a new ONU.
3. The OLT allocates an ONU-ID to the ONU.
4. The OLT measures the phase of the upstream data transmitted by the ONU.
5. The OLT informs the ONU of the compensation delay.
6. The ONU adjusts the transmit phase as informed of.

GPON Terminal
GPON terminal management refers to configuration and management of optical network Control
terminals (ONTs) on the GPON optical line terminal (OLT) through the ONT Management and
Interface (OMCI).
• The OMCI is a master-slave management protocol. The MA5603T is the master and the ONT is the slave. The MA5603T controls multiple ONTs through the OMCCs.
• PLOAM refers to Physical Layer OAM. The PLOAM message includes such information as the serial number and password of the ONT for authentication.
• Operations, Administration and Maintenance (OAM) function
the OMCC is established between the MA5603T and the ONT as
follows:
1. After the power-on, the ONT sends the Serial_Number_ONT
PLOAM messages to the MA5603T to complete the registration.
2. From the received PLOAM messages, the MA5603T knows whether
the ONT supports the OMCI protocol channel. The OMCC can be
established between the MA5603T and the ONT only when the
ONT also supports the OMCI protocol channel.
3. Through the OMCC, the MA5603T sends the configuration and
management messages to the ONT.
4. Through the OMCC, the ONT reports the status and alarm
messages to the MA5603T.

example network of full access
services in the FTTx scenario
applications include FTTH, FTTB, FTTC, FTTO, FTTM, and VIP P2P access.
 FTTH indicates fiber to the home. The ONT is connected to the OLT in the PON mode to
implement FTTH. The voice, data, and video services are provided through a single optical
fiber.
 FTTB/FTTC indicates fiber to the building/fiber to the curb. The MDU is connected to the
OLT in the PON mode to implement FTTB/FTTC, and provides voice, data, and video
services for the users in communities.
 FTTO indicates fiber to the office. The SBU is connected to the OLT in the PON mode to
implement FTTO. In this way, the Intranet TDM PBX, Intranet IP PBX, and Intranet private
line services are provided.
 FTTM indicates fiber to the mobile base station. The CBU is connected to the OLT in the
PON mode to implement base station backhaul.
 P2P indicates point to point. The VIP household and enterprise users can be directly
connected to the OLT through GE optical fibers to implement end-to-end QoS.

Configuring the FTTH Service
The OLT is connected to the remote ONT through a GPON port to
provide users with the highspeed Internet access service.
Service Requirements
 The user PC is connected to the ONT through the LAN port in the PPPoE
dialing mode. The ONT is connected to the OLT and then to the upper-
layer network in the GPON mode to provide the high-speed Internet
access service.
 The high-speed Internet access service is identified by two precisely-
bound VLAN tags. On the ONT, each user is allocated with a CVLAN; on the
OLT, each slot is allocated with an SVLAN.
 The high-speed Internet access service adopts a bandwidth-ensured mode
with the maximum bandwidth 100 Mbit/s as the DBA profile.

Prerequisite
 The OLT is connected to the BRAS.
 Related configurations are performed on the BRAS according to the
authentication and accounting requirements for dialup users
 The VLAN of the LAN switch port connected to the OLT is the same as the
upstream VLAN of the OLT.
Dataplan

• vlan 100 smart
• vlan attrib 100 q-in-q
• port vlan 100 0/6 0
• vlan 4000 smart
• port vlan 4000 0/6 0
• interface vlanif 4000
• ip address 192.168.50.1 24
• quit
• dba-profile add profile-name PPPoE type4 max 102400
• ont-lineprofile gpon profile-id 10
• tcont 4 dba-profile-name PPPoE
• gem add 0 eth tcont 4
• gem add 1 eth tcont 4
• mapping-mode vlan
• gem mapping 0 0 vlan 4000
• gem mapping 1 1 vlan 1001
• commit
• quit
• interface gpon 0/2
• port 1 ont-auto-find enable
• display ont autofind all
• ont confirm 1 ontid 0 sn-auth 32303131B39FD641 snmp ont-lineprofile-id 10
• ont ipconfig 1 0 static ip-address 192.168.50.2 mask 255.255.255.0 vlan 4000
• ont alarm-profile 1 0 profile-id 1
• service-port 0 vlan 4000 gpon 0/2/1 ont 0 gemport 0 multi-service
• user-vlan 4000 rx-cttr 6 tx-cttr 6
• service-port 1001 vlan 100 gpon 0/2/1 ont 0 gemport 1 multi-service
• user-vlan 1001 rx-cttr 6 tx-cttr 6

Procedure
Configure the OLT:
1. Create a service VLAN and add an upstream port to it.
The VLAN ID is 100, and the VLAN is a smart VLAN, VLAN attribute is QinQ. Add
upstream port 0/6/0 to VLAN 100.
huawei(config)#vlan 100 smart
huawei(config)#vlan attrib 100 q-in-q
huawei(config)#port vlan 100 0/6 0

Configure a traffic profile.
You can run the display traffic table ip command to query the traffic profiles existing
in the system. If the traffic profiles existing in the system do not meet the requirements,
you need to run the traffic table ip command to add a traffic profile.

Configure a traffic profile.
You can run the display traffic table ip command to query the traffic profiles existing
in the system. If the traffic profiles existing in the system do not meet the requirements,
you need to run the traffic table ip command to add a traffic profile.
Command:

Add a DBA profile.
You can run the display dba-profile command
to query the DBA profiles existing in
the system. If the DBA profiles existing in the
system do not meet the requirements,
you need to run the dba-profile add
command to add a DBA profile.

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