What Is an OLT (Optical Line Terminal)?
An OLT is the core device in a PON network, installed at the service provider's central office. It acts as the "brain" of the fiber network, managing all connected ONU/ONT devices, allocating bandwidth, and communicating with the upstream IP network.
Langzhi Technology offers 2-port, 4-port, 8-port and 16-port GPON/EPON OLTs compatible with Huawei, ZTE and other mainstream ONUs.
What Is ONU/ONT?
ONU (Optical Network Unit) and ONT (Optical Network Terminal) are customer-side devices that convert optical signals from fiber into Ethernet signals for user devices.
ONU vs ONT
- ONT — ITU-T term, typically a single-user terminal in FTTH (the optical modem in your home)
- ONU — IEEE term, typically a multi-user shared device in FTTB
Key Differences: OLT vs ONU/ONT
- Location: OLT at central office, ONU/ONT at user premises
- Role: OLT manages, ONU/ONT is managed
- Scale: One OLT manages hundreds of ONU/ONT
- Cost: OLT $100-$5000, ONU/ONT $5-$50
PON Network Architecture
A complete PON network: OLT (central office) → ODN (fiber + splitters) → ONU/ONT (user end).
How to Choose
OLT: consider port count, GPON vs EPON, uplink speed, management features. ONU/ONT: consider interface type, WiFi/VoIP needs, PON compatibility.
