NetComm NP726 Product Data Sheet page 2

IAC4500 VLAN Management
The IAC4500 offers two methods of connection. User can either be issued a unique
user name and password which is required on log in, or using VLAN tagging, the Port
Location Mapping Feature in the IAC. Rooms can then be recognized via its room
number. Both options in the IAC4500 offer zero configurations for subscribers/hotel
room guests. Guests simply plug the Ethernet cable into their laptop, enter a
username and password or simply accepts the terms and conditions and they are
connected without changing any settings at all.
VLAN Management
A VLAN allows a physical network to be divided into several logical networks. A device
can belong to more than one VLAN group. Devices that are not in the same VLAN
groups can not talk to each other. VLAN can provide isolation and security to users
and increase performance by limiting broadcast domain. VLAN tag can be added to
the MAC header to identify the VLAN membership of a frame across bridges. A
tagged frame is four bytes longer than an untagged frame. Each port of NCT480 is
capable of passing tagged or untagged frames.
Each port has its own Ingress rule. If Ingress rule accept tagged frames only, the
switch port will drop all incoming non-tagged frames. If Ingress rule accept all frame
type, the switch port simultaneously allow the incoming tagged and untagged frames.
An untagged frame doesn't carry any VID to which it belongs. When an untagged
frame is received, Ingress Process insert a tag contained the PVID into the untagged
frame. Each physical port has a default VID called PVID (Port VID). PVID is assigned
to untagged frames or priority tagged frames (frames with null (0) VID) received on
this port. Figure 2 illustrates the VLAN Tagging relationship between the NCT480 and
the IAC4500.
Figure 2: 802.1Q VLAN Tagging relationship between NCT480 and IAC4500
How to configure NetComm IAC4500 for billing by volume application with NCT480 IP DSLAM using
port location mapping
Nov2008
2
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