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Diagram

Used equipment

OLT

ModelNumber of uplink portsType of uplink portsNumber of PON portsModes of operation of PON ports
LTX-844 × 40/100G QSFP288GPON or XGS-PON
LTX-1644 × 40/100G QSFP2816GPON or XGS-PON

ONT

ModelType of WANNumber of LAN portsType of LAN ports
NTX-1XGS-PON2

1 × 10G (10GBASE-T)
1 × 1G

NTU-1GPON11 × 1G
NTU-RG-5420G-Wac / 
NTU-RG-5421G-Wac / 
NTU-RG-5520G-Wax / 
NTU-RG-5521G-Wax 
GPON44 × 1G

Additionally, NTU-RG subscriber equipment is shown on the diagram. Devices of this line of GPON ONTs are capable of operating in router mode, they require configuration of internal interfaces. Configuration can be performed by local connection to the ONT via the web interface or remotely using TR-069 and the built-in OLT or external ACS-server.

Configuration

In this example, configuration of the same services (Internet VLAN 2149 + IPTV VLAN 30) that were covered in the main section on configuring the equipment will be performed: Configuring and health checking the equipment (XGS-PON diagram). Key difference of this diagram from the Appendix 1. XGS-PON+GPON on OLT LTX-8/16C combo diagram is the use of non combo series LTX and physical connection of one PON tree to different pon port interfaces via WDM Coexistence Element adder. The configuration procedure for such a diagram is described below.

  1. Create the cross-connect and ports service profiles for ONT. In this case, the configuration concept will be identical for both ONTs. Configuration of Internet + IPTV in untagged mode is performed at the egress of ONT's LAN interfaces. Therefore, a common cross-connect profile for NTU-1 and NTX-1 should be created. In this example different ports profiles will be created: for NTX-1 – with two LAN ports configured, for NTU-1 – with a single LAN port configured.
    LTX-16# configure terminal                                              #switching to OLT configuration mode
LTX-16(configure)# profile cross-connect HSI_bridge                     #switching to Internet service profile configuration mode
LTX-16(config)(profile-cross-connect-HSI_bridge)# ont-mode bridge       #specifying ONT operation mode – bridge
LTX-16(config)(profile-cross-connect-HSI_bridge)# bridge group 20       #specifying bridge group number (it can be any number identical to the number in profile ports)
LTX-16(config)(profile-cross-connect-HSI_bridge)# outer vid 2149        #specifying the Internet service VLAN ID
LTX-16(config)(profile-cross-connect-HSI_bridge)# user vid untagged     #specifying VLAN ID at the egress of LAN OUT
LTX-16(config)(profile-cross-connect-HSI_bridge)# multicast enable      #enabling multicast transmission
LTX-16(config)(profile-cross-connect-HSI_bridge)# exit
LTX-16(configure)# profile ports NTX1
LTX-16(config)(profile-ports-NTX1)# igmp multicast dynamic-entry 1 vid 30 group 224.0.0.1 239.255.255.254   #specifying the enabled range of multicast groups
LTX-16(config)(profile-ports-NTX1)# port 1 multicast enable                                                 #enabling multicast processing at the ONT
LTX-16(config)(profile-ports-NTX1)# port 1 bridge group 20                                                  #specifying the bridge group number (the number should be identical to the number in cross-connect)
LTX-16(config)(profile-ports-NTX1)# port 1 igmp downstream tag-control remove-tag                           #a rule for deleting the VLAN tag for downstream muticast
LTX-16(config)(profile-ports-NTX1)# port 1 igmp downstream vid 30                                           #VLAN ID of the downstream multicast traffic
LTX-16(config)(profile-ports-NTX1)# port 1 igmp upstream tag-control add-tag								#a rule for adding the VLAN tag for upstream muticast
LTX-16(config)(profile-ports-NTX1)# port 1 igmp upstream vid 2149											#VLAN ID of the upstream multicast traffic
LTX-16(config)(profile-ports-NTX1)# port 2 multicast enable													#same configuration for the LAN port 2
LTX-16(config)(profile-ports-NTX1)# port 2 bridge group 20
LTX-16(config)(profile-ports-NTX1)# port 2 igmp downstream tag-control remove-tag
LTX-16(config)(profile-ports-NTX1)# port 2 igmp downstream vid 30
LTX-16(config)(profile-ports-NTX1)# port 2 igmp upstream tag-control add-tag
LTX-16(config)(profile-ports-NTX1)# port 2 igmp upstream vid 2149
LTX-16(config)(profile-ports-NTX1)# exit
LTX-16(configure)# profile ports NTU1
LTX-16(config)(profile-ports-NTU1)# igmp multicast dynamic-entry 1 vid 30 group 224.0.0.1 239.255.255.254	#specifying the enabled range of multicast groups
LTX-16(config)(profile-ports-NTU1)# port 1 multicast enable													#enabling multicast processing at the ONT
LTX-16(config)(profile-ports-NTU1)# port 1 bridge group 20													#specifying the bridge group number (the number should be identical to the number in cross-connect)
LTX-16(config)(profile-ports-NTU1)# port 1 igmp downstream tag-control remove-tag							#a rule for deleting the VLAN tag for downstream muticast
LTX-16(config)(profile-ports-NTU1)# port 1 igmp downstream vid 30											#VLAN ID of the downstream multicast traffic
LTX-16(config)(profile-ports-NTU1)# port 1 igmp upstream tag-control add-tag								#a rule for adding the VLAN tag for upstream muticast
LTX-16(config)(profile-ports-NTU1)# port 1 igmp upstream vid 2149                                           #VLAN ID of the upstream multicast traffic
LTX-16(config)(profile-ports-NTU1)# exit
LTX-16(config)# do commit 						#applying configuration
LTX-16(config)# do save							#saving the changes to non-volatile memory
  2. Configuring service VLAN on the uplink interface of an OLT, enabling IGMP snooping and proxy report.
    LTX-16(configure)# vlan 30																	#switching to the VLAN 30 editing mode of the internal OLT switch
LTX-16(config)(vlan-30)# name IPTV															#specifying the VLAN name
LTX-16(config)(vlan-30)# exit
LTX-16(configure)# vlan 2149																#switching to the VLAN 2149 editing mode of the internal OLT switch
LTX-16(config)(vlan-2149)# name Internet 													#specifying the VLAN name 
LTX-16(config)(vlan-2149)# exit
LTX-16(configure)# interface front-port 1													#switching to the editing mode of the front-port 1 uplink interface
LTX-16(config)(if-front-1)# vlan allow 30,2149											    #adding VLAN to uplink interface in tagged (general) mode
LTX-16(config)(if-front-1)# do commit
LTX-16(config)(if-front-1)# exit
LTX-16(configure)# ip igmp snooping enable													#enabling IGMP snooping
LTX-16(configure)# ip igmp proxy report enable												#enabling proxying of client IGMP report requests
LTX-16(configure)# ip igmp proxy report range 224.0.0.1 239.255.255.254 from 2149 to 30		#enabling redirecting of report requests of the specified groups from VLAN 2149 to VLAN 30
LTX-16(configure)# do commit
LTX-16(configure)# do save
LTX-16(configure)# exit
  3. Connecting subscriber terminals. According to the above diagram, GPON and XGS-PON ONTs are connected to a single fiber optic line, which in turn is connected to the adder input. Then adder connects to an OLT via two outputs. First adder output is connected to a PON port of the OLT, which is configured in GPON mode. Second one is connected to another OLT port, which is configured in XGS-PON mode. Thus, ONTs of each technology will be visible on their PON port interfaces. With this connection scheme, the signal attenuation levels for GPON and XGS-PON ONTs should correspond to their respective technologies. These characteristics are reflected in the datasheets for ONTs. Take a look at OLT pon port 1 interface configuration in GPON mode and pon port 2 interface configuration in XGS-PON mode.
    LTX-16# show interface pon-port 1-2 state			#viewing the status of the PON SFP-transceiver and the interface operation mode
LTX-16# configure terminal							#switching to OLT configuration mode
LTX-16(configure)# interface pon-port 1				#switching to PON channel 1 configuration mode
LTX-16(config)(if-pon-1)# pon-type gpon				#specifying PON port operation mode
LTX-16(config)(if-pon-1)# exit
LTX-16(configure)# interface pon-port 2				#switching to PON channel 2 configuration mode
LTX-16(config)(if-pon-2)# pon-type xgs-gpon			#specifying PON port operation mode (xgs-pon is a default value, changing the parameter here is required if the value is set to gpon)
LTX-16(config)(if-pon-2)# exit
LTX-16(configure)# do commit 						#aplying configuration
LTX-16(configure)# do save							#saving the changes to non-volatile memory

    Changing the pon-type will cause reconfiguration of the OLT chip and a brief interruption in service provisioning for all ONTs connected to the OLT. The OLT chip reconfiguration is also accompanied by a momentary loss of management access to the OLT.

    Detection of unregistered ONTs will take place on PON port of their respective type. Inactive ONTs of this tree, working on GPON technology, will be displayed and registered on pon-port 1 interface. The XGS-PON ONTs – on pon-port 2.
    LTX-16# show interface ont 1-2 connected
-----------------------------------
pon-port 1 ONT connected list
-----------------------------------
        ##    PON-port    ONT ID                    Serial         Status         RSSI             EquipmentID        Version
        1            1       n/a              ELTX89000274    UNACTIVATED          n/a                     n/a            n/a
-----------------------------------
pon-port 2 ONT connected list
-----------------------------------
        ##    PON-port    ONT ID                    Serial         Status         RSSI             EquipmentID        Version
        1            2       n/a              ELTXA3000066    UNACTIVATED          n/a                     n/a            n/a

Total ONT count: 2
  4. Registering the ONT to the OLT and apply the configuration.
    LTX-16(configure)# interface ont 1/1														#switching to the editing mode of ont 1/1 (channel number / id of ont on the channel)
LTX-16(config)(if-ont-1/1)# serial ELTX89000274												#specifying PON serial of ONT (can be copied from the list of connected devices)
LTX-16(config)(if-ont-1/1)# service 1 profile cross-connect HSI_bridge dba dba2				#assigning Internet+IPTV cross-connect profile on ONT
LTX-16(config)(if-ont-1/1)# profile ports NTX1												#assigning ports profile on ONT
LTX-16(config)(if-ont-1/1)# exit
LTX-16(configure)# interface ont 2/1														#switching to the editing mode of ont 1/1 
LTX-16(config)(if-ont-2/1)# serial ELTXA3000066												#specifying pon-serial of ONT
LTX-16(config)(if-ont-2/1)# service 1 profile cross-connect HSI_bridge dba dba1				#assigning Internet+IPTV cross-connect profile on ONT
LTX-16(config)(if-ont-2/1)# profile ports NTU1												#assigning ports profile on ONT
LTX-16(config)(if-ont-2/1)# exit
LTX-16(configure)# do commit
LTX-16(configure)# do save

    Profiles dba1 and dba2 are present in the default configuration. Each profile corresponds to a different technology. dba1 is used for XGS-PON ONT, dba2 – for GPON. When configuring services, you can use the default profiles or create separate profiles. For details on DBA configuration, please refer to the User Manual.

  5. Verifying the registration status of the configured ONTs.
    LTX-16# show interface ont 1-2 connected
-----------------------------------
pon-port 1 ONT connected list
-----------------------------------
        ##    PON-port    ONT ID                    Serial         Status         RSSI             EquipmentID        Version
        1            1         1              ELTX89000274             OK       -19.39             NTU-1:rev.C      3.29.2.53
-----------------------------------
pon-port 2 ONT connected list
-----------------------------------
        ##    PON-port    ONT ID                    Serial         Status         RSSI             EquipmentID        Version
        1            2         1              ELTXA3000066             OK        -10.24            NTX-1:rev.B      1.2.0.562

Total ONT count: 2
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