SFU and HGU are core devices in the field of fiber optic communication and network access, primarily used for broadband access in home or small business scenarios. With the popularization of fiber optic broadband, HGU has become mainstream due to its comprehensive functionality, while SFU has gradually receded to a secondary position.
SFU (Single Family Unit)
Definition
SFU is a Layer 2 Optical Network Terminal (ONT) in Fiber to the Home (FTTH) scenarios, mainly providing fiber access services to individual household users. It is similar to a small-port switch and only supports basic optical signal conversion and data passthrough functions.
Functions
Optical Signal Conversion: Converts optical signals transmitted through fiber into electrical signals for use by household devices.
Layer 2 Data Passthrough: Connects users' routers or computers via Ethernet ports to achieve data forwarding without routing (bridge mode).
Basic Interface Support: Typically equipped with 1-4 Ethernet ports, 1-2 fixed telephone interfaces (POTS), and some models support cable TV (CATV) interfaces.
HGU (Home Gateway Unit)
Definition
HGU is a three-layer optical network terminal in FTTH scenarios, integrating functions such as an optical modem, router, and Wi-Fi hotspot, and can serve directly as the core device of a home network.
Functions
Optical Signal Conversion: Similar to SFU, it converts optical signals to electrical signals. Routing and NAT Functions: Supports dynamic IP acquisition (such as PPPoE dialing) and assigns private IPs to home devices through NAT technology.
Wi-Fi Coverage: Built-in dual-band Wi-Fi (e.g., Wi-Fi 5/6), supporting simultaneous connections of multiple devices. Advanced Management Functions: Supports remote configuration, firewall, QoS traffic control, etc.
Multi-service Integration: Integrates services such as voice (VoIP), IPTV, and USB storage sharing.
| SFU | HGU | |
|---|---|---|
| Device Hierarchy | Layer 2 devices (switches) | Three-tier equipment (router) |
| IP Allocation | Users need to dial in manually | Automatic IP allocation, supports NAT |
| Wi-Fi Functionality | None, requires an external router | Built-in Wi-Fi, supports multi-device connection |
| Management Method | Primarily local management | Supports remote management (TR069) and local configuration |
| Applicable Scenarios | Basic broadband access | Comprehensive home network, high bandwidth requirements |
| Cost | Relatively low | Higher (more comprehensive features) |
