Cisco Comcast Xfinity DPC3939 User manual



Wireless Gateway 2

Model Numbers: DPC3939, TC8706C

Quick Start Guide

Wireless Gateway 2

Wi‑Fi

Devices

About the Wireless Gateway 2 (Model Numbers: DPC3939, TC8706C)

The Wireless Gateway 2 is an all-in-one product that connects XFINITY Internet,

XFINITY Voice, and home networking. It provides wired and Wi-Fi connectivity, so

there’s no need for a separate router.

•Dual-Band Wi-Fi 2.4 & 5 GHz

•Parental Controls

•Firewall

•Port Forwarding & Blocking

•Wi-Fi Protected Setup (WPS)

Learn how Wi‑Fi and

5 GHz

works in your home.

Check out p. 6.

This Quick Start Guide will help you:

Step Find Your Default Wireless Network Info

Step Connect Your Wi-Fi Devices

Step Log In and Secure the Admin Tool

Step . Find Your Default Wireless Network Info

A LifttheWirelessGateway

toviewthebottompanel

On the bottom panel label, ﬁnd

the two Network Names (SSIDs)

and the one Network Key

(Password). The case-sensitive

password is the same for both

Network Names (SSIDs).

B Writedownyour

information

In the lines below, write

down your wireless network

information for future reference.

Wireless “Network Name (SSID 1)” for 2.4 GHz Wi-Fi Band (Example: HOME-XXXX-2.4)

Wireless “Network Name (SSID 2)” for 5 GHz Wi-Fi Band (Example: HOME-XXXX-5)

Wireless “Network Key (Password)” Same for both bands (case-sensitive)

Wireless

Network Names

(SSIDs)

Wireless

Network Key

(Password)

Gateway’s

Bottom Panel

Note: The default Network Names (SSIDs) and Network Key (Password) are unique to your Wireless Gateway. If

you’d like to change them, see p. 5. We recommend changing the Network Key (Password).

Step 2. Connect Your Wi-Fi Devices

Now that you have your wireless network information, you’re ready to connect your

Wi-Fi devices (laptops, tablets, mobile devices) to the Wireless Gateway 2.

Follow the steps below for each Wi-Fi device you want to connect to your home

network.

For the best experience from the Wireless Gateway 2, connect to both 2.4 and

5 GHz networks, if your Wi-Fi device supports both networks (p. 6). If it does not,

only connect to the 2.4 GHz network.

A GototheWi-Fi SettingsonyourWi-Fidevice andensure

Wi-Fiisturnedon

Directions to access the Wi-Fi settings for popular operating systems are below. If

your operating system is not listed, refer to the manufacturer’s guides.

Windows

On your Windows®Desktop,

click the Wireless Network icon.

Android

From the Apps screen, tap the

Settings icon. Tap Wireless &

Networks, then Wi-Fi Settings.

Apple Mac OS X

On your Mac®Desktop, click

the Wi-Fiicon.

Apple iOS

(iPad, iPhone, iPod Touch…)

From the Home Screen, tap the

Settings icon. Tap the Wi-Fi icon.

B SelecttheGHzNetworkName

(SSID)onyourWi-Fidevice 

Under the Wi-Fi settings, the list of available

networks should appear. Select your home

network (such as Home-XXXX-2.4) from

Step1.

C EntertheNetworkKey(Password)on

yourWi-Fidevice 

When prompted, enter the case-sensitive

Network Key (Password) from Step 1. Tap the

conﬁrmation button—usually labeled Join,

Connect, or OK.

D CheckifyourWi-Fidevice is

connectedtoyourGHznetwork

If your Wi-Fi device is connected, you should

see a check mark (or other indication) next to

the Network Name (SSID) you had selected.

E TestyourInternetconnectiononyourWi-Fidevice 

Open a web browser (Internet Explorer or Safari), and try to access a site, such as

www.xﬁnity.com.

F ConnectyourWi-Fidevice to

theGHzband

If your device supports 5 GHz, you should

see Home-XXXX-5. To connect to 5 GHz,

repeat Steps 2A-2E. If you don’t see your

5 GHz network or you don’t have a 5 GHz

Wi-Fi capable device, skip this step.

Note: For help with the above steps or to learn about Wi-Fi and 5 GHz, see p. 5-7.

Step 3. Log In and Secure the Admin Tool

You can manage your network and security settings using the Wireless Gateway 2’s

Admin Tool. To ensure better security for your Wireless Gateway 2 and home network,

we recommend changing the default password to a password of your own.

A Open a web browser from a connected wired or Wi-Fi device . Go to

http://10.0.0.1 and the Login page appears.

B Enter admin for Username.1Enter password

for Password.

C Click LOGIN and the At a Glance page

appears.

D Click CHANGE PASSWORD for Increased

Security (recommended).

1. Enter “password” in the Current Password

ﬁeld.

2. Create a new password of your choice.2

3. Re-enter your new password.

4. Click “Save”.

5. Your settings should now be saved.

1The username “admin”cannot be changed.

2The password must be at least 8 characters

and may include letters or numbers or a

combination of both (no symbols). For better

security, try using at least 1 number and a mix

of upper and lower case letters.

The Wireless Gateway 2 enables you to personalize your home network. Features that

can be customized using the Admin Tool include:

• ParentalControls: Create rules for different network devices.

• Firewall: Manage network security settings.

• WirelessNetworkInfo:

The default NetworkNames(SSIDs)

can be changed. You may ﬁnd it helpful

to keep the -2.4 and -5 in the Network

Names (SSIDs) to distinguish between

the two network bands.

The default NetworkKey(Password),

which is the same for both 2.4 and

5 GHz network bands, can be changed. You can change each band separately

or use the same password for both. Keep in mind that they are case-sensitive.

Note: To edit your wireless network info in the Admin Tool, go to Gateway > Connection > Wi-Fi.

For more information about the Wireless Gateway 2, visit

http://customer.comcast.com/userguides and download the User Guide.

Wi-Fi Connectivity Tips

If you’re having trouble connecting a Wi-Fi device to your 2.4 and 5 GHz Wi-Fi

networks (or if neither network appears in the available networks list), simple actions

may help.

Try the following tips in order. After trying a tip, see if you can connect to your network

by repeating Steps 2A-2F (p. 3-4). If you can’t connect, try the next tip.

Tip Move the Wi-Fi device next to the Wireless Gateway 2.

Tip On the Wi-Fi device, turn the Wi-Fi setting off and then on.

Tip Restart the Wi-Fi device by powering off and then on.

If none of the above tips resolve your connection issue, reset the Wireless Gateway 2.

Caution: Resetting the Gateway will disrupt XFINITY Voice and Internet services for

at least ﬁve minutes. Therefore, during the reset, you’ll be unable to make or

receive any calls, including calls to 911 or emergency services.

Following are two ways to reset the Wireless Gateway 2.

• Use a thin object to press the Reset button on the back panel.

Hold for 2-5 seconds, and then release.

Caution: Holding the Reset button for 15 seconds or more will

restore default factory settings. Any changes you’ve

made to the Wireless Gateway 2 (such as passwords,

parental controls, or ﬁrewall settings) will be lost.

• UnplugtheWirelessGateway2andremovethebatteryfromthe

bottom panel (if you have one). Replace the battery, then replug.

If you change your default

wireless network settings, write

down the information to replace

the default wireless network

settings on p. 2. You’ll need the

new information to connect

Wi‑Fi devices to your network

in the future.

Wireless Gateway 2 Placement

Where you put the Wireless Gateway 2 in your home can affect your connectivity,

range (operating distance), and performance of connected Wi-Fi devices . For

optimal results from the Wireless Gateway 2, follow these guidelines to identify your

home’s ideal location.

• Place the Wireless Gateway 2 in an upright, elevated location (closest to the center

of where you’ll typically use your Wi-Fi devices).

• Minimize the number of walls and ceilings between the Wireless Gateway 2 and

your Wi-Fi devices.

• Place the Wireless Gateway 2 away from electronics that may cause interference

(such as microwaves and cordless phone bases).

5 GHz in Your Home

Most Wi-Fi networks primarily operate in the 2.4 GHz frequency band only, but the

increasingly popular 5 GHz networks offer signiﬁcant advantages. With dual-band

Wi-Fi devices , you’ll experience the beneﬁts of both 2.4 and 5 GHz networks.

Why use 5 GHz?

• Higher speed capability than 2.4 GHz

• Less wireless interference in the 5 GHz band

• Large data, such as video or game ﬁles, download faster than with 2.4 GHz

because 5 GHz can support higher speeds

• Compatible with many newer 5 GHz Wi-Fi consumer electronic devices, such as:

Tablets Mobile Phones

Laptops Game Systems

HD TVs

About Wi-Fi and the Wireless Gateway 2

• Not all Wi-Fi devices support 5 GHz,

especially older ones. If your device is

5 GHz capable, you should see the 5 GHz

Network Name (SSID) in the list of available

networks (p. 3-4). If you don’t, and you’re

unsure if your Wi-Fi device supports 5 GHz,

check the manufacturer’s documentation.

• Although the Wireless Gateway 2 simultaneously broadcasts both 2.4 and 5 GHz,

Wi-Fi devices can connect to only one Wi-Fi network at a time.

• 5 GHz Wi-Fi signals may not travel as far as 2.4 GHz. In areas of your home that

are furthest away from the Wireless Gateway 2, only the 2.4 GHz network may

be available. We recommend connecting to both 2.4 and 5 GHz networks during

initial set-up of all your Wi-Fi devices .

If you’re connected to the Wireless Gateway 2’s 5 GHz network and move out

of the 5 GHz range (move to a different room), your Wi-Fi device may

disconnect and automatically reconnect to your 2.4 GHz (if you’ve connected to it

previously).

Note: When you’re back in the 5 GHz range, go to Wi-Fi settings (p. 3-4) to reconnect to the Wireless

Gateway 2’s 5 GHz network in order to experience its benefits.

• The Wi-Fi bars on your Wi-Fi device indicate signal strength.

• Some Wi-Fi devices support Wi-Fi Protected Setup (WPS).

WPS lets you set up secure Wi-Fi networks without manually

entering your Wi-Fi network information. Pressing the WPS button

on the Wireless Gateway 2 initiates WPS for both 2.4 and 5 GHz Wi-Fi bands. You

can then connect to either band using WPS.

Learn about the Wireless Gateway 2 at http://customer.comcast.com/userguides.

For questions about your XFINITY services, call 1-800-XFINITY.

Windows is a registered trademark of Microsoft Corporation in the United States and other countries. Mac OS®and

OS X®are registered trademarks of Apple Inc. IOS is a trademark or registered trademark of Cisco in the U.S. and

other countries and is used under license. Android is a trademark of Google Inc. All trademarks are the property of

ENG WG2XB3 QSG 07.13

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