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Domain Examples/Broadband Internet (FTTH) — On-net

Broadband Internet (FTTH) — On-net

How an order for FTTH Home Internet 1 Gbit/s is fulfilled end to end: the catalog defines the product, SOM decomposes it, inventory finds and ROM reserves the actual OLT port, splitter port, ONT, VLAN and IP address, NMS / EMS configures the OLT and BNG, and the confirmation moves each resource from AVAILABLE through RESERVED to IN SERVICE. A representative modern FTTH OSS architecture.

Architecture Overview

The FTTH landscape end to end: the systems that sell, orchestrate, allocate and configure the service above the network it runs on, from the customer premises through the PON access network, aggregation and the BNG to the Internet. Press Simulate an activation to watch order #12345 go live, or tick the failure option to see a failed activation rolled back. A representative modern FTTH OSS architecture; systems and boundaries vary between operators.

BSS — Commercialwhat can be soldSOM — Service Order Managementwhat service is needed — never touches a deviceROM — Resource Order Managementwhich resources — reserved, then allocatedNetwork managementconfigures the live network — executes, does not chooseCOM captures the product order: a product at an address. No resources are named.Customer orderCOM · #12345Defines what can be sold and how it decomposes — specifications only, never runtime instances.Product Catalogproduct · CFS/RFS · specsSOM decomposes the product into the CFS and RFS it needs, and the resource types they require.Service decompositionCFS → RFS · resource typesSOM sequences the fulfilment, hands resource work to ROM and waits for confirmation. It never configures a device.Service orchestrationsequence · track · confirmRecords the service instances once activation is confirmed.Service inventoryCFS / RFS instancesThe operational model of the deployed network: every resource, its relationships, its state and who has it.Resource inventorywhat exists · stateCommits the chosen instances to the order before any provisioning, so no other order can take them.ReservationAVAILABLE → RESERVEDTurns the reserved resources into a provisioning request for the network management layer.Resource fulfilmentprovisioning requestConfigures the OLT (and through it the ONT) and the aggregation switches. Executes; does not choose.NMS / EMSOLT · aggregationConfigures the BNG subscriber resource and writes the subscriber profile to AAA / RADIUS.BNG mgmt + AAAsubscriber · policyMonitors the live network and compares it with inventory; drift raises a discrepancy.Assurancereconcile with inventoryCustomer premisesAccess network (PON)Aggregation / metroCore networkInternet / externaldrop fibre · FBR-001PONVLAN 100Home router (customer premises equipment), behind the ONT’s UNI port.RouterONT-ABC123 — registered on OLT-01 PON 1/1/5, UNI 1 to the router.ONTSplitter SP-01, 1:32 — port 17 feeds this customer. Passive: nothing to configure.Splitter SP-011:32 · port 17OLT-01 — PON 1/1/5 (XGS-PON) serves this customer.OLT-01PON 1/1/5 · XGS-PONAggregation switch — VLAN 100 allowed on the trunk towards BNG-01.AggregationVLAN 100 trunkBNG-01 — subscriber on VLAN 100, IP 10.20.30.40, 1 Gbit/s / 100 Mbit/s policy.BNG-01IP 10.20.30.40InternetIPTVVoIPIPTV / VoIP optionalInternetcontent · OTT

Press Simulate an activation to watch order #12345 travel from the product order to a live service: the systems light up as they act, a pulse follows each message, and the captions follow each resource from AVAILABLE through RESERVED to IN SERVICE. Tick Simulate a failed activation to see what happens when the OLT rejects the ONT.

Customer premises & ONT

The home router plugs into the ONT’s Ethernet port (UNI 1). The ONT (ONT-ABC123) terminates the fibre and converts light to Ethernet. It is operator-managed and configured through the OLT over OMCI — the TR-069 ACS configures the home router, not the ONT.

OLT — Optical Line Terminal

The active access equipment in the exchange. Each PON port — here OLT-01, port 1/1/5, XGS-PON — serves up to 32–64 homes through a passive splitter. The OLT registers each ONT by serial number, applies its line / service profile and VLAN 100, schedules upstream traffic (TDMA) and hands it to aggregation on a tagged uplink. Its NMS / EMS is what ROM’s provisioning request configures first.

Splitter & aggregation

The splitter (SP-01, 1:32) is passive: no power, nothing to configure — just a port recorded in inventory. Aggregation switches collect the OLTs’ uplinks and carry VLAN 100 on an 802.1Q trunk to the BNG.

BNG — Broadband Network Gateway

The IP edge for every subscriber. BNG-01 terminates the customer’s IPoE / PPPoE session on VLAN 100, authenticates it against AAA / RADIUS, assigns the IP address (10.20.30.40 from POOL-FTTH-01) and enforces the subscriber profile — the 1 Gbit/s / 100 Mbit/s speed and QoS — then routes the traffic into the core. The OLT connects the home; the BNG makes it an Internet customer.

Core & Internet

Core routing, DNS and peering to upstream providers and content, plus the IPTV and VoIP platforms where those services are sold. Shared by every customer: nothing here is reserved per order.