22 — I-241G-A and I-240G-A unit data sheet
Alcatel-Lucent 7342 ISAM FTTU ONT R04.05.06 July 2008 22-7
3FE 51892 AAAA TCZZA Edition 01 ONT Product Information Manual
Table 22-6 Downstream untrusted and trusted tagging behavior
VLAN translation traffic handling
VLAN translation is a feature that allows that ONT to translate a C-VLAN into
another C-VLAN. A network (NW) C-VLAN is used when data is sent over the
GPON network, and a user network interface (UNI) side C-VLAN is used when data
is sent to customer equipment.
When using VLAN translation, the use the following configuration rules:
• Only a single UNI/NW C-VLAN pair is allowed per service.
• Overlapping P-bits can be used for difference services on UNI. However, in
VLAN pass-tru mode, the same P-bits as other services cannot be used on the
UNI. Overlapping P-bits are allowed only for non-default services.
Table 22-7 describes upstream VLAN tagging and P-bit allocation in VLAN
translation mode.
Table 22-7 Upstream VLAN translation mode
Table 22-8 describes downstream VLAN tagging behavior for VLAN translation.
Traffic mode Traffic type Transmitted to ONT port as
Strip tag Untagged packets Untagged packet.
P-bit tagged packets Untagged packet.
C-VLAN tagged packets Untagged packet.
Tag through Untagged packets Untagged packet.
P-bit tagged packets Default C-VLAN is added and the
maximum number of P-bits will be
accepted.
C-VLAN tagged packets Default C-VLAN overwrites the received
C-VLAN and the maximum number of
P-bits will be accepted.
Traffic mode Traffic type Ethernet switch behavior
VLAN translation Untagged packets Default C-VLAN and P-bits are added to the packets.If the
packets are IP, the DSCP to P-bits mapping is used. If the
packets are PPPoE, the default P-bits are used. The C-VLAN
and derived P-bits are now considered the UNI side C-VLAN.
Received UNI C-VLAN and P-bits must match NW C-VLAN
configure P-bits or the packet is dropped.
P-bit and C-VLAN tagged
packets
Received UNI C-VLAN and P-bits must match NW C-VLAN
configure P-bits or the packet is dropped.
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