6 — LP MDU, MDU, and modular ONT hardware functional blocks
6-12 July 2008 Alcatel-Lucent 7342 ISAM FTTU ONT R04.05.06
ONT Product Information Manual Edition 01 3FE 51892 AAAA TCZZA
Ethernet switch
The Ethernet switch provides a data path between the board and VDSL2 interface.
The switch also supports a PCI bus to the on-board controller function.
Table 6-10 describes the switch features.
Table 6-10 Ethernet switch features
On-board controller
The OBC provides the communication control processing functions to the Ethernet
switch and the board.
Table 6-11 describes the OBC interfaces.
Table 6-11 OBC interfaces
AES support Advanced Encryption Standard (AES) algorithm, is a symmetric block
cipher that can encrypt and decrypt information. AES algorithm
supports key sizes of 128 bits, 192 bits, and 256 bits.
Internal MDU VLAN tagging Supports VLAN tag extraction and insertion functions for internal
traffic grooming and the Frame Check Sequence (FCS)
check/calculate function.
Network timing reference
(NTR)
Supports synchronization for subsystems that need to be referenced
to network synchronization sources.
Feature Description
(2 of 2)
Feature Description
VLAN cross-connect Cross-connection between VLAN and Ethernet
IGMP mirror Enables IGMP snooping. The IGMP mirror function extracts a packet
from the data stream from the OBC while simultaneously sending it
towards the GPON interface and service board.
IPMC Used to enable video stream multicasting and replication towards the
respective service interfaces
Priority level mapping Eight priority levels of IEEE 802.1P/Q mapped to eight priority queues
for each Ethernet port. Priority queues are configurable for each
Ethernet port.
Double VLAN tagging Supports two VLAN tagged Ethernet frames with an Ethernet packet
size of 2000 bytes
Interface Description
Micro wire Used to connect to the remote inventories, flash memory, RS-232
signals, and temperature sensors on the MDU ONT board
PCI Used to connect the OBC to the Ethernet switch
(1 of 2)
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