Broadband network architecture refers to the design and structure of the networks that deliver high-speed internet access to end-users. Broadband can be delivered via a variety of mediums including copper lines, fiber optics, cable, satellite, and wireless technologies. The architecture includes the physical components (like cables and switches) and the functional organization (like how data flows through the network).
Here’s an overview of the key architectures used to deliver broadband:
DSL (Digital Subscriber Line):
- ArchitectureUses telephone lines to transmit digital data.
- EquipmentCentral office DSLAM (Digital Subscriber Line Access Multiplexer) connects to the customer’s DSL modem.
- TypesADSL, VDSL, etc. vary based on speed and technology.
Cable Broadband:
- ArchitectureUses the coaxial cable infrastructure initially built for cable TV.
- EquipmentCentral office houses CMTS (Cable Modem Termination System) connecting to the user’s cable modem.
- ProtocolDOCSIS (Data Over Cable Service Interface Specification) is commonly used.
Fiber Optic Networks:
- ArchitectureUses thin strands of glass or plastic to transmit data as light signals.
- EquipmentOLT (Optical Line Terminal) at the central office connects to ONT (Optical Network Terminal) or ONU (Optical Network Unit) at the customer premises.
- TypesFTTH (Fiber-to-the-Home), FTTB (Fiber-to-the-Building/Basement), FTTC (Fiber-to-the-Curb/Cabinet), FTTN (Fiber-to-the-Node), etc.
Satellite Broadband:
- Architecture: Uses satellites in orbit to relay data between a central ground station and user dishes.
- Equipment: Satellite dish at the user’s location connects to a modem inside the premises.
Wireless Broadband:
- ArchitectureUses radio frequencies to transmit data between a central tower and end-user devices.
- EquipmentWireless towers equipped with base stations connect to user’s wireless routers or directly to devices.
- TypesWi-Fi (for local areas), WiMAX (for broader coverage), LTE, and 5G are examples.
Hybrid Approaches:
- HFC (Hybrid Fiber-Coaxial): Combines the use of fiber-optic and coaxial cables. Fiber runs to a local node, and from there, coaxial cables connect to individual homes.
- G.fast: A protocol designed to provide fiber-like speeds over short distances of copper lines.
When considering broadband network architecture, several factors come into play:
- Infrastructure CostsInitial investment needed for deployment.
- Maintenance CostsOngoing expenses to keep the network operational.
- PerformanceSpeed, latency, and reliability.
- CoverageAbility to serve urban vs. rural areas.
- ScalabilityEase of expanding the network as demand grows.
The ideal architecture for a given region or application can vary based on existing infrastructure, topography, user density, and desired service levels.
Key terms in plain language
Open a term for a concise explanation of language used on this page.
Broadband
A general term for always-on, high-speed Internet access. Broadband can be delivered over fiber, cable, DSL, fixed wireless, cellular, or satellite networks.
Fiber Internet
Internet delivered through strands of glass using light. Fiber commonly supports high capacity, low latency, and strong upload performance, but availability must be confirmed for the exact address.
Latency
The time it takes data to travel between two points. Lower latency improves voice, video meetings, cloud applications, gaming, and other real-time services.
Bandwidth
The amount of data a connection can carry in a given time, usually measured in Mbps or Gbps. More bandwidth supports more users, devices, and simultaneous applications.
Dedicated Internet Access (DIA)
A business-grade Internet connection with capacity dedicated to the customer rather than shared in the same way as typical consumer broadband. It often includes symmetrical speeds and an SLA.
SD-WAN
Software-defined wide area networking. It manages multiple connections and chooses paths based on application needs, performance, and policy to improve resilience and control.