Huawei HG8120C serves as a network terminal situated in the GPON access layer, establishing connections between home and SOHO users and the Internet via its optical upstream port. On the local area network (LAN) front, the HG8120 offers an array of hardware ports to cater to the diverse network needs of both home and SOHO users.
| Specification of HG8120C | |
| Transmission rate | Rx: 2.488 Gbit/s Tx: 1.244 Gbit/s |
| Port mode | Single-mode |
| Connector | SC/APC, SC/UPC |
| Maximum reach | 20 km |
| Standard compliance | ITU-T G.984.2 CLASS B+ |
| Center wavelength | Tx: 1310 nm Rx: 1490 nm |
| Tx optical power | 0.5 dBm to 5.0 dBm |
| Extinction ratio | > 10 dB |
| Minimum receiver sensitivity | -27 dBm |
| Maximum overload optical power | -8 dBm |
| Power Specifications |
|
| Power adapter input | 100–240 VAC, 50–60 Hz |
| System power supply | 11–14 VDC, 1A |
| Maximum power consumption | 8W |
| Working Environment: | |
| Operating temperature | 0ºC – 40ºC |
| Environment humidity | 5% – 95% (non-condensing) |
| Dimensions and Weight | |
| Dimensions (L W H) | 143mm x 115mm x 30mm |
| Weight (including power adapter) | about 250g |
Features of ONU
To better understand its functions, here are the key features of an ONU:
Triple Play Services: Supports data, IPTV, and VoIP services, catering to the needs of both residential and commercial users.
Bidirectional Data Transmission: Receives broadcast data from the OLT while sending back user-generated data through assigned transmission windows.
Ethernet Data Buffering: Temporarily stores Ethernet data before transmitting it to the OLT, optimizing data flow.
Remote Management via OAM: Enables remote Operation, Administration, and Maintenance (OAM), allowing service providers to monitor and configure ONUs efficiently.
Security and Quality of Service (QoS): Many ONUs offer enhanced security features and Quality of Service (QoS) support, ensuring reliable performance for different applications.
Applications of ONU
RF/CATV Port: Used for connecting to cable television.
Power Interface: Provides power connectivity.
USB Port: Typically a USB 2.0 interface.
LAN Port: Supports FE (10/100BASE-T) or GE (10/100/1000BASE-T) options.
Telephone Port: Also known as POT, VoIP, Voice, or FXS port.
Optical Port: Connects to the Optical Distribution Network (ODN).
Antenna: Provides Wi-Fi connectivity, supporting 2.4 GHz Wi-Fi or dual-band 2.4 GHz/5 GHz Wi-Fi.
Where is the ONU located in FTTx?
Depending on the FTTx (Fiber to the x) technology used, the ONU can be placed in different locations. Different types of FTTx technologies include:
FTTC (Fiber to the Curb): The ONU is placed at a distribution point near the curb or in a cabinet close to user premises.
FTTB (Fiber to the Building): The ONU is installed in a communication cabinet or wiring closet inside the building.
FTTN (Fiber to the Node): The ONU is located at a remote node or access point, typically serving a neighborhood or cluster of users.
FTTH (Fiber to the Home): The ONU is placed inside the home of the end-user.
