NTU-RG-54xx Operational manual
1  Introduction
A GPON is a network of passive optical networks (PON) type. It is one of the most effective state-of-the-art 
solutions for the 'last mile' issue that significantly reduces the required amount of cable and provides data 
transfer with downlink rate up to 2.5 Gbps and uplink rate up to 1.25 Gbps. Being used in access networks, 
GPON-based solutions allow end users to have access to new services based on IP protocol in addition to 
more common ones.
The key GPON advantage is the use of one optical line terminal (OLT) for multiple optical network terminals 
(ONT). OLT converts Gigabit Ethernet and GPON interfaces and is used to connect a PON network with data 
communication networks of a higher level. ONT is designed to connect terminal equipment of user to 
broadband access services. ONT can be used in residential estates and offices.
The range of ONT NTU equipment produced by ELTEX comprises of terminals with four UNI interfaces of 
10/100/1000Base-T and supports for FXS, Wi-Fi, USB, Z-Wave
1
 interfaces:
• NTU-RG-5402G-W, NTU-RG-5421G-Wac, NTU-RG-5421G-WZ
This operation manual describes intended use, key specifications, configuration, monitoring, and firmware 
update for NTU-RG series optical terminal.
1
ForNTU-RG-5421G-WZ.
Notes and warnings
Notes contain important information, tips or recommendations on device operation and setup.
Warnings inform users about hazardous conditions, which may cause injuries or device damage and 
may lead to the device malfunctioning or data loss.