Alcatel-Lucent 7330 Product Information Manual page 245

14 — I-240G-B and I-241G-B unit data sheet
Upgrade considerations and limitations
Existing ONTs that use 7342 ISAM FTTU releases older than R04.06.xx and
R04.07.xx must be upgraded to use R04.00.10 software while assigned to a PON ID
value smaller than 64. For this purpose, if split ratios larger than 1:64 are being
deployed, you may choose to set aside the first PON ID as a staging point.
I-240G-B and I-241G-B ONT considerations and limitations
Table
Considerations and limitations
When using multicast on multiple Ethernet ports, all Ethernet ports must have the same VLAN ID. If
the user-side VLAN IDs are all given the same VLAN ID, a common VLAN ID should result. If not, VLAN
4094 will be used
ONTs are not able to sufficiently buffer enough traffic between grants to support an EIR rate of
1Gb/s over multiple GEM ports. There are only 1.256 Gb/s buffers available in the SoC chip. The
buffers are divided among the number of configured GEM ports. Reducing the number of GEM ports
configured results in increased upstream buffering and higher upstream traffic rates.
Packets of less than 64 bytes are increased to 100 bytes in size with padding under the following
conditions:
•
•
ONTs that use pre R04.00.10 software may not range if the distance from the LT card is less than 1km
14-10
14-12 lists the considerations and limitations for these ONTs.
Table 14-12 I-240G-B and I-241G-B ONT considerations and limitations
in a downstream direction
in an upstream direction only if the ONT has more than 2 Ethernet ports
December 2010
ONT Product Information Guide Edition 01
Alcatel-Lucent 7330/7302 ISAM FTTN R04.02.41
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