TECH FOCUS: OPTICAL LINE TERMINATION
IN THE END
A LOOK AT THE MARKET FOR OPTICAL LINE TERMINATION EQUIPMENT AND SOME OF THE PRODUCTS AND SOLUTIONS AVAILABLE
KEELY PORTWAY O
ptical line terminals (OLT) are used by service providers as the endpoint hardware of a passive optical network (PON). Teir main
functions include conversion between the electrical signals used by the service provider’s equipment and the fibre optic signals used by the PON network; and the coordination of multiplexing between the conversion devices on the optical network terminals (ONT). OLT features include a downstream frame
processing function for receiving and churning an asynchronous transfer mode cell to generate a downstream frame, and converting a parallel data of the downstream frame into a serial data. It also provides a wavelength division multiplexing (WDM) means for performing an electro/optical conversion of the serial data of the downstream frame and performing WDM. Upstream frame processing functionality
allows data extraction from the WDM means searching an overhead field, delineating a slot boundary, and processing physical layer operations administration and maintenance (PLOAM) cell and a divided slot separately.
24 FiBRE SYSTEMS n SPRING 2022 n Issue 35
Control signal generation allows the performance of a media access control protocol and generation of variables and timing signals used for the downstream and upstream frame processing functionalities. Tere is also a control method for controlling the downstream frame and the upstream frame processing functionalities by using the variables and timing signals from the control signal generation function. Te market for OLT equipment is growing,
in line with the market for all PON equipment. According to Mordor Intelligence, the PON equipment market is expected to grow at a compound annual growth rate (CAGR) of 10.27 per cent between 2021 and 2026, thanks to investments in fixed broadband, smart cities and FTTH rollouts gathering pace. Likewise, industry market research firm, LightCounting, has predicted that sales of PON optics will exceed $3bn, and sales of grey and WDM transceivers for fronthaul will account for another $2.9bn between 2022 and 2026, with the balance being for backhaul and midhaul applications.
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