US Robotics ADSL Ethernet Modem Overview page 7

Modify a RFC1483 Bridged Connection
1. Select one VPI/VCI pair from the Connection List.
2. Modify the numbers in the VPI and VCI fields and select the
appropriate encapsulation - LLC or VCMUX.
3. Click Modify.
4. Click OK to save the settings.*
Delete a RFC1483 Bridged Connection
1. Select a VPI/VCI pair from the Connection List.
2. Click Delete.
3. Click OK to save the settings.*
Note: After you click OK, you will be prompted to save your settings.
Make sure you are finished making all your changes before you save
your settings. When you are finished making your changes, click Save .
Configure RFC1483 Routed Mode
Select RFC1483 Routed to use a RFC1483 Routed connection mode.
Routing is the act of moving information across a network from a source
to a destination. Along the way, at least one intermediate node is
typically encountered. Routing is often contrasted with bridging. The
primary difference between the two is that bridging occurs at Layer 2 (the
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link layer) of the OSI reference model, whereas routing occurs at Layer 3
(the network layer).
The ADSL Modem has eight remote virtual ports on the ADSL interface
and one local port (Ethernet) on the user interface.
The ports on the ADSL interface are described as virtual because they
are associated with the ATM virtual connections configured on the ADSL
line. To establish a connection from any of the remote destinations to the
ADSL modem port, PVCs must be configured end-to-end through the
network.
RFC 1483 Routed Setup
Your DSL service provider will provide you with the values of VPI/VCI to
use after you sign up for the service.
Each PVC comes with the following parameters:
Parameters Description
VPI Virtual path identifier
VCI Virtual circuit identifier
WAN IP
Selected PVC's WAN IP address
Address
WAN Subnet
Selected PVC's WAN Subnet Mask
Mask
Logical Link Control allows multiple protocol
LLC running over one virtual circuit with a little bit more
overhead.
Virtual Circuit Multiplexer (null encapsulation)
VCMUX
allows only one protocol running per virtual circuit
with less overhead.
Enable Network Address Port Translation allows multiple
NAPT computers to share a single WAN IP Address
Check your ISP for the related IP information for the WAN connection
including WAN IP, WAN Subnet Mask, and Default Gateway.
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