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Chapter 1
U.S. Robotics ADSL Ethernet Modem
Overview
Description
The ADSL Ethernet modem provides home connectivity to an ADSL
service provider network over an Asynchronous Transfer Mode
(ATM)/ADSL physical layer. It receives adaptive rates of up to
8Mbps downstream and transmits 640Kbps upstream.
System Features
This section introduces the system features of the ADSL Ethernet
modem.
Standards Compliance:
♦ ITU-T G.992.1, G.992.2, and ANSI T1.413 Issue 2
♦ Handshake Protocol: defined in ITU-T G.994.1
♦ IEEE 802.3 10BaseT physical layer specification
Hardware Features
♦ Discrete Multi-Tone based ADSL physical layer
♦ Rate adaptive with maximum downstream data rates up to
8Mbps and upstream data rate up to 640Kbps.
♦ 10BaseT Ethernet interface, compliant with IEEE 802.3.
♦ Status LEDs indicating Ethernet and ADSL activity
♦ Restart and operate automatically after the input power is
restored from a power failure.
♦ Management console support.
Software Features
Multiple data encapsulation formats support
♦ RFC 2364 PPP over ATM AAL5
♦ RFC 2516 PPP over Ethernet with third party client
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♦ RFC 1483 (bridge and routing mode) multi-protocol
encapsulation over ATM AAL5
♦ RFC 1577 Classical IP and ARP over ATM
ATM support
♦ ADSL physical connection supports ATM AAL5
♦ Support for 8 PVCs
♦ End-to-end OAM loopback
Network Access
♦ IP routing protocols: Static routing and RIPv1, v2
♦ 802.1d transparent bridging
♦ DHCP server automatically assigns IP addresses to PCs on
the LAN
♦ NAT enables multiple PCs on the LAN to access the Internet
via single public IP address
Network management
♦ Web-based configuration software
♦ TFTP firmware upgrade and configuration backup and
restore
♦ TELNET server for remote management
♦ SNMPv1 agent
♦ MIBs support with RFC1213, RFC1493 (bridged mode only),
RFC1573, RFC2662
Security
♦ password protected system management terminal
♦ PAP/CHAP authentication for PPP mode
Environmental Constraints
This ADSL Ethernet modem should be operated in an ambient
temperature environment of 0 to 50 degree C. The Ethernet modem
should be stored in an ambient temperature environment of –10 to
70 degree C and relative humidity in the range of 10% and 90%
non-condensing.
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Chapter 2
Hardware Installation
Standard Shipment Contents
Contents
1 ADSL Ethernet modem
1 Installation Guide
1 Power Adapter (18 VAC)
1 RJ-11 Cable
1 Ethernet Cable
1 Installation CD
1 Registration Card
If you did not receive all of the items above, contact your service
provider or dealer.
Hardware Requirements
The following hardware is necessary to configure and use the ADSL
modem:
♦ A 10/100 Ethernet Network Interface Card (NIC) installed on
your computer.
♦ A PC with a Web browser, either Internet Explorer 4.0 or
above or Netscape 4.0 or above. (If you do not have the
required browser, visit http://www.microsoft.com/ or
http://www.netscape.com/ to download and update your
browser. While installing the software, you should enable
JAVA functionality for web-based configuration to work.)
♦ A PC with communications software, such as HyperTerminal
in Win 95/98, for flash crash recovery.
♦ For the management console port option, a PC equipped
with an available DB-9 or DB-25 serial port.
♦ A line filter may be required for each telephone that will
share a line with the ADSL modem. Make sure there is no
filter installed between the ADSL modem and the phone wall
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jack. Microfilters may be supplied by your DSL Internet
Service Provider.
Front Panel LEDs of ADSL Modem
LEDs Description
PWR
The power LED is illuminated when power is applied to the
ADSL Router. Check your power adapter connection if the
LED is not illuminated.
ALM
The alarm LED is illuminated when an error occurs.
LAN
It is illuminated when there is an Ethernet connection between
the ADSL router and your computer. It will be blinking when
there is Ethernet traffic. It will not be illuminated if an Ethernet
cable is not connected.
DSL
It is illuminated when there is an ADSL connection. It will be
blinking when there is ADSL traffic. It will not be illuminated
when the ADSL cable is not connected or the ADSL
connection fails.
Note: All the LED’s will be illuminated for approximately 30 seconds
when you power on or reboot the ADSL modem.
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Rear Panel Connectors of ADSL Modem
Connector Label Description
PWR Power Plug – connects to the power adapter.
LAN Ethernet Port – connects to the Ethernet port on
your PC or an Ethernet hub.
CONSOLE Management RS-232 Console Port – connects to
the serial port on your PC.
DSL ADSL Port – connects to the phone wall jack.
LAN Connector
The pin-out of the ADLS modem’s RJ-45 jack is the same as a
standard Ethernet UTP jack.
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ADSL Connector
The RJ-11 jack of the Router uses pin 3 and pin 4.
Install the ADSL Ethernet Modem
1. Connect one end of the RJ-11 phone cord to the DSL port on the
rear of your ADSL modem. Connect the other end of the RJ-11
phone cord to your wall phone jack.
2. Connect one end of the Ethernet cable to the ENET port on the rear
of the ADSL modem. Connect the other end of the Ethernet cable to
the Ethernet port on the NIC in your computer.
Note: To connect the ADSL modem directly to a PC or to the uplink port
of a hub or router, use the Ethernet cable that was provided with
your ADSL modem. The Ethernet cable that came with your ADSL
modem is a straight-through UTP copper cable. To connect the
ADSL modem to a port other than the uplink port of a hub, a
crossover UTP cable must be used.
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3. Plug the AC power adapter cord into the PWR jack at the rear of the
ADSL modem. Plug the AC power adapter into a standard wall
outlet. The ADSL modem is always supplied with power, so there is
no power switch to turn on. The PWR LED on the front panel of the
ADSL modem will be illuminated if power is being supplied to the
modem. If your computer is not on, turn it on now.
II. Verification of correct operation
Use the following procedures to verify the installation and operation of
the ADSL modem. Refer to the Troubleshooting section of this guide if
any problems occur.
1. Launch an Internet browser on the computer connected to the ADSL
modem.
2. Enter a URL of your choice or enter http://www.usr.com in your Web
browser.
3. Watch the DSL LED on the front of the ADSL modem blink as data is
transmitted or received. If the selected Web page comes up in the
Internet browser screen, the network connection is successfully
established.
Additional Options
Install External Micro-filter for the Telephone
In certain situations without a POTS splitter, transient noise from a
telephone can interfere with the operation of the ADSL modem and the
ADSL modem may introduce noise to the telephone line. To prevent this
from happening, a small external micro-filter must be connected to each
telephone.
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PC
ADSL Modem
Telephone
External POTS splitter
Voice
Data
Micro-filter
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Chapter 3
Configuration Guide
Purpose
This chapter will provide the configuration steps for the ADSL modem.
The ADSL modem automatically trains up to the ideal line speed. By
default, the ADSL modem is provisioned with rates of 8 Mbps
downstream and 640 Kbps upstream. The maximum operative rate is
determined by your DSL service provider. After establishing a connection
between your ADSL modem and your DSL service provider, you will
have an always-on connection. There are logical connections that should
be set up upon initial configuration, which establish the virtual channel for
different applications. To configure the logical connections, you must
provision ATM virtual connections.
On the ADSL modem, the ADSL physical interface is always ready to
send and receive network traffic. You may need to define an ATM virtual
connection (VC) when communicating across an ATM network for logical
connection setup. The ATM connection is identified by two indicators:
virtual path identifiers (VPI) and virtual circuit identifiers (VCI). Each
connection must have a unique pair of VPI and VCI settings. Check with
your service provider for details.
Log on to the ADSL Modem
In order to configure the ADSL modem, open a Web browser and enter
the default IP address of http://192.168.1.1. The default password is
12345. No User Name is required. You must use the default password
the first time you log in, but you should change the password for your
ADSL modem after the first login. Refer to the Change Password
section for details.
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Select the ADSL Protocol
The US Robotics ADSL Ethernet Modem supports the following four
different ADSL protocols:
• Multi-mode (default)
• G.DMT (G.992.1)
• G.Lite (G.992.2)
• ANSI T 1.413 Issue 2
When using the multi-mode setting, the ADSL Ethernet modem will
attempt to automatically determine which protocol is being used. In most
cases, the default setting of Multi-mode should not be changed. This
setting should only be changed if your service provider has specified that
a specific protocol should be used. To use a different ADSL Protocol,
select the appropriate button and click OK.
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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.
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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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