22 — I-241G-A and I-240G-A unit data sheet
Alcatel-Lucent 7342 ISAM FTTU ONT R04.05.06 July 2008 22-5
3FE 51892 AAAA TCZZA Edition 01 ONT Product Information Manual
IGMP packet replication allows the I-241G-A and the I-240G-A to support IPTV on
all four Ethernet channels at the same time. Internal VLAN tagging allows traffic to
be routed and prioritized between the two Ethernet MACs on the SoC and the
Ethernet switch and the appropriate subscriber RJ-45 ports.
Downstream multicast traffic received on a user side C-VLAN tagged port will use
VLAN ID 4094 and have a P-bit value of 6.
The new Ethernet switch functional block and the additional Ethernet switch features
have modified certain VLAN tagging and priority queuing behaviors. The following
sections describe these modifications.
VLAN tagging behavior
Before traffic can be routed to and from the I-241G-A and the I-240G-A, the
following conditions must be met:
• A default C-VLAN must be created for each Ethernet port. The VLAN must be
unique for Ethernet port 1 and 2 or 3 and 4 on the ONT. The C-VLAN packet
received at the ONT must be the same as the default C-VLAN or the packet is
dropped.
The default VLAN can be configured using the CVLANDEF parameter of the
ENT-ONTENETTL1 command described in the 7342 ISAM FTTU Operations
and Maintenance Procedures Guide using TL1 and CLI. A null value will not be
accepted.
• The CVLAN ID of any HSI service cannot be 0.
• Default P-bits must be configured on each Ethernet port.
This can be configured using the ENT-QOS-MARKPROF command described
in the 7342 ISAM FTTU Operations and Maintenance Procedures Guide using
TL1 and CLI.
• DSCP to 1P mapping rules are reduced from 64 to 8 with only the highest 3 bits
of the DSCP area used to determine P-bit value; see Table 22-4.
This can be configured using the ENT-PROFILE-DSCPBITMAP command
described in the 7342 ISAM FTTU Operations and Maintenance Procedures
Guide using TL1 and CLI.
Note — The RF video amplifier is integrated with the triplexer. It is
shown split-out in Figure 22-1 to illustrate the functionality.
Note 1 — Due to certain Ethernet switch restrictions, the I-241G-A
and the I-240G-A provides up to 4 IP, 4 MAC, or 2 pairs of MAC/IP
based anti-spoofing (static only). MAC, IP, and MAC/IP
anti-spoofing only works on both IPoE packets.
Note 2 — Congestion may occur if Ethernet ports 1 and 2 or ports 3
and 4 are each set to 1000Base-T and are being used simultaneously.
See the ONT Customer Release Notes for this product for throughput
details.
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