US Robotics USR8550 Bedienungsanleitung PDF herunterladen (Seite 6)

Note: After you click OK, you will be prompted to save your settings.

Click Save to save the changes you have made.

Configuring the Service Provider Settings

The ADSL modem supports four Service Provider WAN services:

• RFC1483 Bridged Mode (To be used as an Ethernet bridge)

• RFC1483 Routed Mode

• PPP over ATM (PPPoA) Mode

• PPP over Ethernet (PPPoE) Mode

A more detailed description of each connection mode follows.

Configure RFC1483 Bridged Mode

Select RFC1483 Bridged to use RFC1483 Bridged mode. Bridging is a

standardized layer 2 technology. It is typically used in corporate networks

to extend the physical reach of a single LAN segment and increase the

number of stations on the common LAN without compromising

performance. Bridged data is encapsulated using the RFC1483 protocol

to enable data transport.

One important characteristic of bridging is the number of bridge ports.

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 that are configured on

the ADSL line. To establish a connection from any of the remote

destinations to the bridge port, PVCs must be configured end-to-end

through the network. Your DSL service provider will provide you with the

VPI/VCI values to use after you subscribe to the service.

The bridged mode comes with the following parameters:

Parameters Description

VPI Virtual path identifier

VCI Virtual circuit identifier

LLC

Logical Link Control allows multiple protocol

running over one virtual circuit with a little bit more

overhead.

VCMUX

Virtual Circuit Multiplexer (null encapsulation)

allows only one protocol running per virtual circuit

with less overhead.

Enable

NAPT

This option is only for a routed connection and

cannot be used in bridged or PPPoE mode.

VPI/VCI

The ATM connection is identified by the two following indicators: virtual

path identifiers (VPI) and virtual circuit identifiers (VCI). Each connection

must have a unique pair of <VPI, VCI> settings.

RFC 1483 Bridged Setup

Create a new RFC1483 Bridged Connection

1. Enter the correct numbers in the VPI and VCI fields.

2. Select the appropriate encapsulation - LLC or VCMUX.

3. Click Add. This will create a new VPI/VCI connection. Up to 8

VPI/VCI connections can be set.

4. Click OK to save the settings.*

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