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Wireless IAD User Manual 
 
84 
After pressing Next, you will see the 
web page listed as the right one. 
Choose the protocol that you would 
like to use.   
Please refer to Quick Setup for more 
information if you don’t know how to 
set the configuration. 
Enable QoS: 
Check this item to enable IP QoS for a 
PVC. It can improve performance for 
selected classes of applications. For 
more details please refer to 
Advanced/Quality of Service
 
section. 
If you choose PPPoE (or Bridging), 
you will see the option for 802.1Q 
VLAN Tagging
802.1Q VLAN Tagging:   
802.1Q-compliant switch ports can be 
configured to transmit tagged or 
untagged frames. A tag field 
containing VLAN (and/or 802.1p 
priority) information can be inserted 
into an Ethernet frame. If a port has an 
802.1Q-compliant device attached 
(such as another switch), these 
tagged frames can carry VLAN 
membership information between 
switches, thus letting a VLAN span 
multiple switches. However, it is 
important for network administrators to 
ensure ports with non-802.1Q- 
compliant devices attached are 
configured to transmit untagged 
frames. Many NICs for PCs and 
printers are not 802.1Q-compliant. If 
they receive a tagged frame, they will 
not understand the VLAN tag and will 
drop the frame. Also, the maximum 
legal Ethernet frame size for tagged 
frames was increased in 802.1Q (and 
its companion, 802.3ac) from 1,518 to 
1,522 bytes. 
After checking Enable 802.1Q VLAN 
Tagging
, you will have to enter a 
VLAN ID, as shown in the figure. 
VLAN ID:  
The VLAN Identifier is a 12 bit field. It 
uniquely identifies the VLAN to which 
the frame belongs to and can have a 
value between 0 and 4095. 
Click Next to continue. 
Notice that 802.1Q VLAN 
Tagging function can only be 
invoked under PPPoE and 
Bridging Mode; the system will 
not provide this option while 
setting PPPoA or IPoA mode.