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                       NTU Optical Network Terminals      5 
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 2.5Gbps and uplink rate up to 1.25Gbps. 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 device can be used in residential estates and offices. 
 
The range of ONT NTU equipment produced by ELTEX comprises of the following terminals:  
  NTU-RG-1421G-Wac,  NTU-RG-1431  G-Wac,  NTU-RG-1421GС-Wac  and  NTU-RG-1421G-WZ,  which  are 
designed to support four UNIs: 10/100/1000Base-T, FXS, Wi-Fi, USB, CaTV
 and Z-Wave
. 
 
This operation manual describes intended use, key specifications, configuration, monitoring, and firmware 
update for NTU-RG optical terminal series. 
 
 
 Only for NTU-RG-1421GС-Wac 
 Only for NTU-RG-1421G-WZ