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26
NTU Optical Network Terminals
3.2
NTU-2W Architecture
Fig. 15— Logical Architecture of a Device with Factory Settings
Main Components of the Device:
–
optical receiver/transmitter (SFF module)
for conversion of an optical signal into an electric one;
–
processor (PON chip)
which converts Ethernet and GPON interfaces.
A device with factory (initial) settings have the following logical blocks (see Fig.15Fig. 15):
br1;
eth0…1;
wl0;
IPInterface.
In this case, the
br1
block is used to combine LAN ports in one group.
The
eth0..1
blocks physically represent Ethernet ports with RJ-45 connector for connection of PC, STB, or
other network devices. They are logically included into the
br1
block.
The
wl0
block is an interface for Wi-Fi module connection.
The
Filter
and
Marking
blocks are designed to include local interfaces in one group (
br1
). These blocks are
responsible for traffic rules:
Filter
is used for incoming traffic, while
Marking
—for the outgoing one.
The
IPInterface
block is a logical object with an IP address for LAN access and a DHCP server, which
assigns addresses to clients.
A connection to the OB device (successful connection to a stationary OLT) additionally creates the
gpondef
blocks with the help of the OMCI protocol (ONT Management and Control Interface). The block ensures
connection of the subscriber’s ONT device to station-side equipment.
