1 — ONT and MDU overview
Alcatel-Lucent 7330/7302 ISAM FTTN R04.02.42a March 2011 1-15
3FE 54199 AAAA TCZZA Edition 01 ONT Product Information Guide
7 ONTs provide service management applications including the following:
• ONT management control interface (OMCI) manager
• VoIP manager
• VDSL2 manager
• 802.1x manager
• DS1/E1 manager
• Ethernet manager
• Craft manager
• Filter manager (DOS, rate limiting, OAM, MAC, DHCP, anti-spoofing etc...)
• DHCP client
• IGMP video manager
• GPON/Port-ID, QoS, and VLAN tagging manager
• GPON manager
• Equipment manager
• Software download manager
• MLT/Diagnostics manager
1.3 GPON transmission support
The GPON transmission layer supports GEM based packets as well as the following
features also described in G.984.3 (GPON TC Layer) ITU specification.
FEC
Forward Error Correction (FEC) is used by the GEM transport layer between the
ONTs and an P-OLT, and is based on transmitting the data in an encoded format. The
encoding introduces redundancy, which allows the decoder to detect and correct the
transmission errors.
Fragmentation
Fragmentation occurs when a packet received at the ONT is larger than the maximum
transmission grant size. The ONT segments the packet and sends the segments in
multiple GEM frames over the GPON to the LT card at the P-OLT. The packets are
then reassembled at the LT card. Fragmentation occurs between the ONT and the
P-OLT in the upstream direction.
Note — FEC is not supported on the following types of ONTs:
• I-020E-B
• I-020E-H
• I-220E-A
• O-421E-B
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