Diagram

Used equipment

OLT

ONT

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 an ONT via the web interface or remotely using TR-069 and the built-in OLT or external ACS server.

Configuration

In this example, the same services (Internet VLAN 2149 + IPTV VLAN 30) will be configured that were reviewed in the main section about configuring the equipment Configuring and health checking the equipment (XGS-PON diagram). The configuration procedure for a diagram with the combo XGS-PON + GPON 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, consider creating a common cross-connect profile for NTU-1 and NTX-1. 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-16C# configure terminal #switching to OLT configuration mode LTX-16C(configure)# profile cross-connect HSI_bridge #switching to Internet service profile configuration mode LTX-16C(config)(profile-cross-connect-HSI_bridge)# ont-mode bridge #setting ONT operation mode as bridge LTX-16C(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-16C(config)(profile-cross-connect-HSI_bridge)# outer vid 2149 #specifying the Internet service VLAN ID LTX-16C(config)(profile-cross-connect-HSI_bridge)# user vid untagged #specifying VLAN ID at the egress of LAN OUT LTX-16C(config)(profile-cross-connect-HSI_bridge)# multicast enable #enabling multicast transmission LTX-16C(config)(profile-cross-connect-HSI_bridge)# exit LTX-16C(configure)# profile ports NTX1 LTX-16C(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-16C(config)(profile-ports-NTX1)# port 1 multicast enable #enabling multicast processing at the ONT LTX-16C(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-16C(config)(profile-ports-NTX1)# port 1 igmp downstream tag-control remove-tag #a rule for deleting the VLAN tag for downstream multicast LTX-16C(config)(profile-ports-NTX1)# port 1 igmp downstream vid 30 #VLAN ID of the downstream multicast traffic LTX-16C(config)(profile-ports-NTX1)# port 1 igmp upstream tag-control add-tag #a rule for adding the VLAN tag for upstream multicast LTX-16C(config)(profile-ports-NTX1)# port 1 igmp upstream vid 2149    #VLAN ID of the upstream multicast traffic LTX-16C(config)(profile-ports-NTX1)# port 2 multicast enable #same configuration for the LAN port 2 LTX-16C(config)(profile-ports-NTX1)# port 2 bridge group 20 LTX-16C(config)(profile-ports-NTX1)# port 2 igmp downstream tag-control remove-tag LTX-16C(config)(profile-ports-NTX1)# port 2 igmp downstream vid 30 LTX-16C(config)(profile-ports-NTX1)# port 2 igmp upstream tag-control add-tag LTX-16C(config)(profile-ports-NTX1)# port 2 igmp upstream vid 2149 LTX-16C(config)(profile-ports-NTX1)# exit LTX-16C(configure)# profile ports NTU1 LTX-16C(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-16C(config)(profile-ports-NTU1)# port 1 multicast enable #enabling multicast processing at the ONT LTX-16C(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-16C(config)(profile-ports-NTU1)# port 1 igmp downstream tag-control remove-tag #a rule for deleting the VLAN tag for downstream multicast LTX-16C(config)(profile-ports-NTU1)# port 1 igmp downstream vid 30 #VLAN ID of the downstream multicast traffic LTX-16C(config)(profile-ports-NTU1)# port 1 igmp upstream tag-control add-tag #a rule for adding the VLAN tag for upstream multicast LTX-16C(config)(profile-ports-NTU1)# port 1 igmp upstream vid 2149    #same configuration for the LAN port 2 LTX-16C(config)(profile-ports-NTU1)# exit LTX-16C(config)# do commit #applying configuration LTX-16C(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-16C(configure)# vlan 30 #switching to the VLAN 30 editing mode of the internal OLT switch LTX-16C(config)(vlan-30)# name IPTV #specifying the VLAN name LTX-16C(config)(vlan-30)# exit LTX-16C(configure)# vlan 2149                                                               #switching to the VLAN 2149 editing mode of the internal OLT switch LTX-16C(config)(vlan-2149)# name Internet #specifying the VLAN name LTX-16C(config)(vlan-2149)# exit LTX-16C(configure)# interface front-port 1                                                  #switching to the editing mode of the front-port 1 uplink interface LTX-16C(config)(if-front-1)# vlan allow 30,2149    #adding VLAN to uplink interface in tagged (general) mode LTX-16C(config)(if-front-1)# do commit LTX-16C(config)(if-front-1)# exit LTX-16C(configure)# ip igmp snooping enable #enabling IGMP snooping LTX-16C(configure)# ip igmp proxy report enable #enabling proxying of client IGMP report requests LTX-16C(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-16C(configure)# do commit LTX-16C(configure)# do save LTX-16C(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 a single combo PON interface OLT. With this connection diagram, the signal attenuation levels for GPON and XGS-PON ONTs must match their respective technologies. These characteristics are reflected in the ONT datasheets. It should also be taken into account that one physical PON combo port 1-2 will correspond to two interfaces configured on the OLT — pon-port 1 and pon-port 2, each of which will have its own unconfigurable type: gpon or xgs-pon. The first in order combo port index will always correspond to the GPON type, the second to the XGS-PON type. This is reflected in the configuration.

   exit interface pon-port 1 pon-type gpon ! real port: combo-port 1-2 exit interface pon-port 2 pon-type xgs-pon ! real port: combo-port 1-2 exit interface pon-port 3 pon-type gpon ! real port: combo-port 3-4 exit interface pon-port 4 pon-type xgs-pon ! real port: combo-port 3-4 exit            ...

   Therefore, when a combo SFP transceiver is plugged into combo-port 1-2 interface, this transceiver is detected on both interfaces belonging to this combo-port, as the combo SFP module itself has two different transceivers — one for GPON and one for XGS-PON.
   

   LTX-16C# show interface pon-port 1-2 state Port State Admin state Pon-type ONT online ONT total SFP vendor SFP product nu... SFP vendor revision SFP temperature [C] SFP voltage [V] SFP tx bias current [mA] SFP tx power [dBm] ------- -------- ----------- -------- ---------- --------- ----------------- ----------------- ------------------- ------------------- --------------- ------------------------ ------------------ 1 OK UP gpon 0 1 Hisense LTF5308B-BC+ 11 39 3.217 3.548 0.077 2 OK UP xgs-pon 0 1 Hisense LTF5308B-BC+ 11 39 3.217 39.564 0.763 "-" - Not Available, n/s - Not Supported, x - I2C Transaction Error

   Only the special combo GPON+XGS-PON SFP module Hisense LTF5308B-BC+ can be connected to combo PON interfaces. Do not connect other SFP module models, including regular GPON or XGS-PON SFP.

   In addition, detection of unregistered ONTs will take place on pon-port of its type. Inactive ONTs of this tree, working on GPON technology, will be displayed and registered on pon-port 1 interface. XGS-PON — on pon-port 2.

   LTX-16C# 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-16C(configure)# interface ont 1/1 #switching to the ont 1/1 editing mode (channel number / id ont on the channel) LTX-16C(config)(if-ont-1/1)# serial ELTX89000274 #specifying pon-serial ONT (can be copied from the list of connected ONTs) LTX-16C(config)(if-ont-1/1)# service 1 profile cross-connect HSI_bridge dba dba2 #assigning the cross-connect Internet+IPTV profile to ONT LTX-16C(config)(if-ont-1/1)# profile ports NTX1 #assigning the ports profile to the ONT LTX-16C(config)(if-ont-1/1)# exit LTX-16C(configure)# interface ont 2/1 #switching to ont 2/1 editing mode LTX-16C(config)(if-ont-2/1)# serial ELTXA3000066 #specifying pon-serial ONT LTX-16C(config)(if-ont-2/1)# service 1 profile cross-connect HSI_bridge dba dba1 #assigning the Internet+IPTV cross-connect profile on ONT LTX-16C(config)(if-ont-2/1)# profile ports NTU1 #assigning the ports profile to the ONT LTX-16C(config)(if-ont-2/1)# exit LTX-16C(configure)# do commit LTX-16C(configure)# do save

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

5. Verifying the registration status of the configured ONTs.
   

   LTX-16C# 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 -18.39 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 -9.79 NTX-1:rev.B 1.2.0.562 Total ONT count: 2