4 — ONT software and security features
Alcatel-Lucent 7342 ISAM FTTU ONT R04.05.06 July 2008 4-3
3FE 51892 AAAA TCZZA Edition 01 ONT Product Information Manual
5 SOC-based ONTs rate-limit the number of control packets for protocols IGMP,
DHCP, and ARP to 10 control packets per second by ONT UNI port. IGMP is
not rate-limited for an ONT UNI port if an IGMP channel is provisioned for the
port.
6 ONTs provide a file storage database (flash or SDRAM).
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
• MoCA 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
This hardware and software architecture supports all the ONT based features
described in this chapter and in the 7342 ISAM FTTU Product Information Manual.
4.2 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.
Note 1 — Not all software management applications are present on
every ONT since not all ONTs have the same functional hardware
blocks.
Note 2 — For more information on the service management
applications, see the 7342 ISAM FTTU Product Information Manual.
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