A ONU (Optical Network Unit) é o equipamento instalado no usuário que recebe o sinal transmitido pela OLT. O modelo ISCOM HT803G-W possui 4 portas Giga Ethernet, 2 portas POTS e interface Wireless. O design discreto e é de fácil configuração atendendo todas as necessidades de serviços dos usuários finais.
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Utilização em clientes de provedores com rede FTTx.


Hardware features	
Dimensions 174 mm (Length) ×129 mm (Width) ×38 mm (Height)
Weight < 0.4 kg
Power consumption ≤ 18 W
Power adapter input 100–240 VAC (50/60 Hz)
Power adapter output 12 VDC, 2 A
Operating temperature 0–50°C
Operating humidity 10%–93% (non-condensing)

Software features	
Data	The ONU provides four 10/100/1000 Base-T Ethernet interfaces, with the following features:
- Ethernet auto-negotiation and auto-MDI/MDIX
- IEEE 802.11b/g/n WLAN interface
- Embedded with Layer 2 switching
- Embedded with Layer 3 router and home gateway
- Advanced data functions, such as processing VLAN Tags, traffic classification, and
packet filtering
- USB 2.0 Flash
- 2 video services: video stacking and data delivering (through unicast and multicast)
- IGMP Snooping and further application optimization: when IGMP Snooping is enabled,
the ISCOM HT803G-W can purposely choose to send multicast data streams upon
detection of a member joining and leaving the multicast group.
- Multiple voice coding schemes
- Echo cancellation, VAD, and CNG
- Static or dynamic jitter buffer
- Various classified services: CID, call waiting, call forward, and call transfer.
- SIP (RFC3261) and H.248 (MEGACO v2) voice protocols
- Common structure and easy replacement. If VoIP access is enabled, the ONT, through the
Ethernet interface, supports connecting to the addiction box of the external network.
- OMCI management and configuration, G984.4/G988 standards, and China Telecom
GPON technical specifications.
- OLT management and local Web management
- Interface Up/Down and power failure alarms
- Thresholds of optical module status parameters and query of the current value
- Various services, including Ethernet, WLAN, VoIP, and RF
- Alarm and performance monitoring
- Mirror-downloading, activating, and restarting software remotely through the OLT
- 2 software mirroring inventories, and checking software integrity

IP routing and
- Multiple WAN interfaces
- WAN connection
– Static configuration
- DHCP Server
- DHCP Relay
- Interface forwarding, static route, ALGs, UPnP, firewall, DMZ, DDNS, NTP, and IGMP
Ethernet bridge	 Wire-speed forwarding
- Hardware-based priority queues support CoS in both the uplink and downlink.
- IEEE 802.1q virtual switching
- IEEE 802.1d bridge
- Up to 2K MAC addresses and 4K VLAN groups
- Up to 256 multicast groups
- Adding/Removing VLAN tag to/from packets of the Ethernet interface
- Mapping from IP ToS/DSCP to IEEE 802.1p
- CoS based on UNI, VLAN-ID, 802.1p bit, and ToS/DSCP
- IEEE 802.1p marking and remarking
- IGMPv1/v2 Snooping
- Rate limiting on broadcast/multicast packets
- MAC address limit
Interface attributes	
GPON interface	 Interface type (SMF): SC/APC for the PON interface
- Transmission rate: 1.25 Gbit/s in the uplink and 2.5 Gbit/s in the downlink
- Central wavelength: 1310 nm for Tx and 1490 nm for Rx
- Tx optical power: 0.5–5 dBm
- Maximum Rx sensitivity: -28 dBm
- Overloading optical power: -8 dBm
GE interface	 10/100/1000Base-T RJ45 Ethernet interface
- Auto-negotiation or manual configuration of the Ethernet interface