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18  NTU Optical Network Terminals 
IPInterface block is a logical entity that the IP address is provided for the access in LAN and DHCP server 
distributing addresses to clients. 
The ppp0.1 block is WAN interface of the router. In the factory default configuration, this interface is a 
default interface for such services as the Internet, VoIP, TR-069 device management and IPTV. 
A connection to OB device (successful connection to an OLT) additionally creates the gpondef block with 
the help of the OMCI protocol (ONT Management and Control Interface). This block enables connection of the 
subscriber ONT device to the station one.