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Section 2.2
CFS, RFS & Resource Explained
The three layers of service/resource decomposition that connect commercial products to network reality.
The Three-Layer Service Model
Below the product layer, the catalog defines three progressively more technical layers: Customer-Facing Service (CFS), Resource-Facing Service (RFS), and Resource. This decomposition is the core of how commercial products translate into network reality.
Product LayerBSS
Fixed Broadband
Product Specification
realised by
CFS LayerOSS
CFS: Internet Access
Customer-Facing Service
decomposes into
RFS LayerOSS
RFS: GPON Bearer
RFS: VLAN Service
RFS: IP Profile
RFS: QoS Profile
requires
Resource LayerOSS
OLT Port
Resource
VLAN ID
Resource
IP Address
Resource
BW Policy
Resource
CFS / RFS / Resource at a Glance
| Layer | What It Represents | Audience | Example |
|---|---|---|---|
| CFS | The service as experienced by the customer — technology-neutral | Product & Service Design | Internet Access, Voice Line, Managed WiFi |
| RFS | The technical service component that implements a CFS — technology-specific | Network & Platform Architecture | GPON Bearer, VLAN Service, IP Profile, QoS Profile |
| Resource | The physical or logical network element allocated and configured | Network Engineering & Operations | OLT Port, VLAN ID, IP Address, BW Policy |
Why Three Layers?
CFS isolates the product from technology choices — you can change the network without changing what the customer sees. RFS allows technology-specific logic without polluting the customer layer. Resources can be managed independently for capacity planning and allocation. Each layer evolves at its own pace.
Key Takeaways
- CFS = what the customer experiences (technology-neutral)
- RFS = how it is implemented (technology-specific)
- Resource = what is allocated on the network (physical/logical)
- One CFS can decompose into different RFS combinations based on access technology
- The three-layer model enables independent evolution of commercial, service, and resource domains