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Congratulations on your purchase of the SMCD3GN3 Wireless Cable Modem Gateway. The
SMCD3GN3 Wireless Cable Modem Gateway is the ideal all-in-one wired and wireless
solution for the home or business environment. SMC is proud to provide you with a powerful,
yet simple communication device for connecting your local area network (LAN) to the
Internet.
This user manual contains all the information administrators need to install and configure
your new SMCD3GN3 Wireless Cable Modem Gateway.
The following list summarizes the Gateway’s key features.
y Integrated, CableLabs-compliant DOCSIS 1.1/ 2.0 /3.0 cable modem
y Four 10/100/1000 Mbps Auto-Sensing LAN ports with Auto-MDI/MDIX
y High-speed 300 Mbps IEEE 802.11n Wireless Access Point
y Dynamic Host Configuration Protocol (DHCP) for dynamic IP configuration, and Domain
Name System (DNS) for domain name mapping
y One USB 2.0 port
y IEEE 802.11 b/g/n interoperability with multiple vendors
y Wireless WEP, WPA, and WPA2 encryption, Hide SSID, and MAC Filtering
y VPN pass-through support using PPTP, L2TP, or IPSec
y Advanced SPI firewall Gateway for enhanced network security from attacks over the
Internet:
– Firewall protection with Stateful Packet Inspection
– Client privileges
– Hacker prevention
– Protection from denial of service (DoS) attacks
– Network Address Translation (NAT)
y Universal Plug and Play (UPnP) enables seamless configuration of attached devices
y Quality of Service (QoS) ensures high-quality performance with existing networks
y Effortless plug-and-play installation
y Intuitive graphical user interface (GUI) configuration, regardless of operating system
y Comprehensive front panel LEDs for network status and troubleshooting
y Compatible with all popular Internet applications
Before you install the SMCD3GN3 Wireless Cable Modem Gateway, check the package
contents and become familiar with the Gateway’s front and back panels.
The topics covered in this chapter are:
y Unpacking Package Contents (page 11)
y System Requirements (page 11)
y Front Panel (page 12)
y Configuring Wireless Security (page 14)
y Rear Panel (page 14)
y Restoring Factory Defaults (page 15)
The SMCD3GN3 package should include the following items:
y One SMCD3GN3 Wireless Cable Modem Gateway
y One power cord
y One Category 5E Ethernet cable
y One CD that contains this User Manual
System Requirements
To complete the installation, you will need the following items:
y Provisioned Internet access on a cable network that supports cable modem service
y A computer with a wired network adapter with TCP/IP installed
y A Java-enabled Web browser, such as Microsoft Internet Explorer 5.5 or above
y Microsoft
The front panel of the SMCD3GN3 Wireless Cable Modem Gateway contains a set of lightemitting diode (LED) indicators. These LEDs show the status of the Gateway and simplify
troubleshooting. The front panel also contains a WPS button for configuring wireless security
automatically.
Figure 1 shows the front panel of the SMCD3GN3 Wireless Cable Modem Gateway. Table 1
describes the front panel LEDs.
Figure 1. Front Panel of the SMCD3GN3 Wireless Cable Modem Gateway
The front panel has a WPS button for configuring wireless security automatically. Pressing
this button for 5 seconds automatically configures wireless security. If the client device
supports WPS Push Button Configuration (PBC), press the button on the client within 60
seconds to automatically configure security on the client.
After pressing this button for 5 seconds, the WPS LED on the front panel flashes. When a
client joins the network successfully, the LED remains ON until the next WPS action or the
device reboots. If no client joins, the LED stops blinking after 4 minutes.
Rear Panel
The rear panel of the SMCD3GN3 Wireless Cable Modem Gateway contains a reset button
and the ports for attaching the supplied power adapter and making additional connections.
Figure 2 shows the rear panel components and Table 2 describes their meanings.
⊄
⊂
⊆
⊇
Figure 2. Rear View of the SMCD3GN3 Wireless Cable Modem Gateway
USB USB 2.0 high-speed port for storing configurations externally.
ETH 1 - 4 Four 10/100/1000 auto-sensing RJ-45 switch ports. Connect devices on your local area network
such as a computer, hub, or switch to these ports.
Reset button Use this button to reset the power or restore the default factory settings (see “Restoring Factory
Defaults,” below). This button is recessed to prevent accidental resets of the Gateway.
Cable Connect your coaxial cable line to this port.
∈
∈
Power Connect the supplied power cord to this port.
The Reset button on the back panel can be used to return the Gateway to its factory default
settings. As a result, any changes made to the Gateway’s default settings will be lost.
If you do not have physical access to the Gateway, you can use the GUI to either power
cycle the Gateway (see “Using the Reboot Menu to Reboot the Gateway” on page 137) or
return the Gateway to its factory default settings (see “Restoring Factory Defaults” on page
136).
The following procedure describes how to use the Reset button to power cycle the Gateway
and return it to its original factory default settings.
1. Leave power plugged into the Gateway.
2. Find the Reset button on the back panel, then press and hold it for at least 10 seconds.
The SMCD3GN3 Wireless Cable Modem Gateway can be installed in any location with
access to the cable network. All of the cables connect to the rear panel of the Gateway for
better organization and utility. The LED indicators on the front panel are easily visible to
provide users with information about network activity and status.
For optimum performance, the location you choose should:
y Be close to a working AC power outlet
y Allow sufficient air flow around the Gateway to keep the device as cool as possible
y Not expose the Gateway to a dusty or wet environment
y Be an elevated location such as a high shelf, keeping the number of walls and ceilings
between the Gateway and your other devices to a minimum
yBe away from electrical devices that are potential sources of interference, such as ceiling
fans, home security systems, microwaves, or the base for a cordless phone
yBe away from any large metal surfaces, such as a solid metal door or aluminum studs.
Large expanses of other materials such as glass, insulated walls, fish tanks, mirrors,
brick, and concrete can also affect your wireless signal
Connecting to the LAN
Using an Ethernet LAN cable, you can connect the Gateway to a desktop computer,
notebook, hub, or switch. The SMCD3GN3 Wireless supports auto-MDI/MDIX, so you can
use either a standard straight-through or crossover Ethernet cable.
1. Connect either end of an Ethernet cable to one of the four ETH ports on the rear panel of
the Gateway (see Figure 3).
Figure 3. Connecting to an ETH Port on the Gateway Rear Panel
2. Connect the other end of the cable to your computer’s network-interface card (NIC) or to
another network device (see Figure 4).
Figure 4. Connecting the Gateway to the a Laptop or Desktop Computer
Connecting the WAN
To connect the Gateway to a Wide Area Network (WAN) interface:
3. Connect a coaxial cable to the port labeled Cable on the rear panel of the Gateway from a
cable port in your home or office (see Figure 2 on page 14). Use only manufactured coaxial
patch cables with F-type connectors at both ends for all connections.
4. Hand-tighten the connectors to secure the connection.
Powering on the Gateway
After making your LAN and WAN connections, use the following procedure to power on the
Gateway:
1. Connect the supplied power cord to the port on the rear panel of the Gateway (see Figure
2 on page 14).
2. Connect the other end of the power cord to a working power outlet. The Gateway powers
on automatically, the POWER LED on the front panel goes ON, and the other front panel
LEDs show the Gateway’s status (see Table 1 on page 13).
WARNING: Only use the power cord supplied with the Gateway. Using a different
power cord can damage the Gateway and void the warranty.
After you install the SMCD3GN3 Wireless Cable Modem Gateway, configure the TCP/IP
settings on a computer that will be used to configure the Gateway. This chapter describes
how to configure TCP/IP for various Microsoft Windows and Apple Macintosh operating
systems.
The topics covered in this chapter are:
y Configuring Microsoft Windows 2000 (page 20)
y Configuring Microsoft Windows XP (page 21)
y Configuring Microsoft Windows Vista (page 22)
y Configuring Microsoft Windows 7 (page 24)
y Configuring an Apple
Use the following procedure to configure your computer if your computer has Microsoft
Windows 2000 installed.
1. On the Windows taskbar, click Start, point to Settings, and then click Control Panel.
2. In the Control Panel window, double-click the Network and Dial-up Connections icon. If
the Ethernet adapter in your computer is installed correctly, the Local Area Connection
icon appears.
3. Double-click the Local Area Connection icon for the Ethernet adapter connected to the
Gateway. The Local Area Connection Status dialog box appears (see Figure 5).
Figure 5. Local Area Connection Status Window
4. In the Local Area Connection Status dialog box, click the Properties button. The Local
Area Connection Properties dialog box appears.
5. In the Local Area Connection Properties dialog box, verify that Internet Protocol (TCP/IP)
is checked. Then select Internet Protocol (TCP/IP) and click the Properties button.
6. Click Obtain an IP address automatically to configure your computer for DHCP.
7. Click the OK button to save this change and close the Local Area Connection Properties
dialog box.
8. Click OK button again to save these new changes.
Use the following procedure to configure a computer running Microsoft Windows XP with the
default interface. If you use the Classic interface, where the icons and menus resemble
previous Windows versions, perform the procedure under “Configuring Microsoft Windows
2000” on page 20.
1. On the Windows taskbar, click Start, click Control Panel, and then click Network and Internet Connections.
2. Click the Network Connections icon.
3. Click Local Area Connection for the Ethernet adapter connected to the Gateway. The
Local Area Connection Status dialog box appears.
4. In the Local Area Connection Status dialog box, click the Properties button (see Figure 6).
The Local Area Connection Properties dialog box appears.
Figure 6. Local Area Connection Status Window
5. In the Local Area Connection Properties dialog box, verify that Internet Protocol (TCP/IP)
is checked. Then select Internet Protocol (TCP/IP) and click the Properties button. The
Internet Protocol (TCP/IP) Properties dialog box appears.
6. In the Internet Protocol (TCP/IP) Properties dialog box, click Obtain an IP address automatically to configure your computer for DHCP. Click the OK button to save this
change and close the Internet Protocol (TCP/IP) Properties dialog box.
7. Click the OK button again to save your changes.
Use the following procedure to configure a computer running Microsoft Windows Vista with
the default interface. If you use the Classic interface, where the icons and menus resemble
previous Windows versions, perform the procedure under “Configuring Microsoft Windows
2000” on page 20.
1. On the Windows taskbar, click Start, click Control Panel, and then select the Network and Internet icon.
2. Click View Networks Status and tasks and then click Management Networks Connections.
3. Right-click the Local Area Connection icon and click Properties.
4. Click Continue. The Local Area Connection Properties dialog box appears.
5. In the Local Area Connection Properties dialog box, verify that Internet Protocol
(TCP/IPv4) is checked. Then select Internet Protocol (TCP/IPv4) and click the
Properties button (see Figure 7). The Internet Protocol Version 4 Properties dialog box
6. In the Internet Protocol Version 4 Properties dialog box, click Obtain an IP address
automatically to configure your computer for DHCP (see Figure 8).
Figure 8. Internet Protocol Properties Window
7. Click the OK button to save your changes and close the dialog box.
8. Click the OK button again to save your changes.
5. Click the OK button to save your changes and close the dialog box.
6. Click the OK button again to save your changes.
Configuring an Apple® Macintosh® Computer
The following procedure describes how to configure TCP/IP on an Apple Macintosh running
Mac OS 10.2. If your Apple Macintosh is running Mac OS 7.x or later, the steps you perform
and the screens you see may differ slightly from the following. However, you should still be
able to use this procedure as a guide to configuring your Apple Macintosh for TCP/IP.
a. Pull down the Apple Menu, click System Preferences, and select Network.
This chapter describes how to use a Web browser to configure the Gateway.
The topics covered in this chapter are:
y Pre-configuration Guidelines (page 29)
y Accessing the Gateway’s Web Management (page 31)
y Understanding the Web Management Interface Screens (page 32)
y Web Management Interface Menus (page 33)