OLT

OLT - Optical linear terminal - the main active part of the PON network, installed on the side of the ISP and, in fact, is an L2 / L3 switch with several Uplink ports (Ethernet, SFP, SFP+), as well as several Downlink ports (GePON / EPON, GPON). On each PON port, a PON tree for 64-128 end-users can be raised.

Each OLT can have 4, 8, 16 PON ports (depending on the model), this allows you to connect up to 1024 user terminals (ONT / ONU). Multiport OLT models often have 10G SFP+ Uplink ports, as well as OLT can be equipped with both AC and DC power supplies, some models have the ability to install additional power supplies for its redundancy.