The PON architecture assumes that a single optical line
terminal, that is, OLT, transmits data to multiple
subscriber devices. The data stream from OLT to the
subscriber ONT is considered to be downstream, data is sent
at a wavelength of 1490 nm. The flow of information in the
opposite direction is considered upward and is transmitted
at a wavelength of 1310 nm. OLT, as well as subscriber ONTs,
have built-in multicomplexers that divide these two streams.
The OLT optical terminal is installed in the telephone
exchange. OLT line ports are connected to the ODF cross with
optical cords or, in other words, patch cords.
The terminal is equipped with an integrated switch.
Connection to the operator network is due to the network
interface and 10 GE. OLT has access to a simple
circuit-switched system - PSTN, as well as to the Internet.
This terminal has access to a provider’s Video resource.
Most often, the data transfer speed from OLT to clients is
2.5 Gbit / s, in the opposite direction it is standard 1.25
Gbit / s. Due to the splitter with OLT, a KTV signal arrives
at a wavelength of 1.55 μm. Other varieties of data are
broadcast on a wavelength of 1.49 μm. Information from user
devices arrives at a wavelength of 1.31 microns.
The prices of the OLT optical terminal depend primarily on
the manufacturer and the specific device model. Since this
is one of the most important nodes of a PON network, the
operation of the entire communication line depends on its
quality. That's why preference should be given to a trusted
brand and a reliable supplier.