Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (2023)

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1Comcast Business DPC3939B Wireless Gateway

2About The Business Gateway

2.1Step 1. Find Your Default Wireless Network Info

2.2Step 2. Connect Your Private Wireless Network

2.4Step 4. Log In and Secure the Admin Tool

3WiFi Connectivity Tips

4GHz in Your Business

5Related Posts

Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (1)

Comcast Business DPC3939B Wireless Gateway

Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (2)

About The Business Gateway

The Business Wireless Gateway is an all-in-one product that connects Comcast Business Internet and Business WiFi networking. It provides wired and WiFi connectivity, so there’s no need for a separate router. The instructions below will guide you through setting up your Private and Public WiFi networks.

  • Dual-Band WiFi 2.4 & 5 GHz
  • Content Controls
  • Firewall
  • Port Forwarding & Blocking
  • WiFi Protected Setup (WPS)

This Quick Start Guide will help you:

  • Step 1. Find Your Default Wireless Network Info
  • Step 2. Connect to your Private WiFi network
  • Step 3. Connect to your Xfinity WiFi Hotspot
  • Step 4. Log In and Secure the Admin Tool
Step 1. Find Your Default Wireless Network Info
  • A. Lift the Business 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. Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (3)
    • Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (4)Wireless “Network Name (SSID 1)” for 2.4 GHz WiFi Band (Example: CBCI-XXXX-2.4)
    • Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (5)Wireless “Network Name (SSID 2)” for 5 GHz WiFi Band (Example: CBCI-XXXX-5)
    • Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (6)Wireless “Network Key (Password)” Same for both bands (case-sensitive)
      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 Private Wireless Network

Now that you have your wireless network information, you’re ready to connect your WiFi devices (laptops, tablets, mobile devices) to the Business Wireless Gateway. Follow the steps below for each WiFi device you want to connect to your business network.
For the best experience from the Business Wireless Gateway, connect to both 2.4 and 5 GHz networks, if your WiFi device supports both networks (p. 6). If it does not, only connect to the 2.4 GHz network.

Go to the WiFiComcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (7) Settings on your WiFi deviceComcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (8) and ensure WiFi is turned on.
Directions to access the WiFi settings for popular operating systems are below. If your operating system is not listed, refer to the manufacturer’s guides.

Directions to access the WiFi 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.Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (9)
  • Android
    From the Apps screen, tap the Settings icon. Tap Wireless & Networks, then WiFi Settings.Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (10)
  • Apple Mac OS X
    On your Mac® Desktop, click the WiFiicon.Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (11)
  • Apple iOS
    (iPad, iPhone, iPod Touch…) From the Home Screen, tap the Settings icon. Tap the WiFi icon.Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (12)

Select the 2.4 GHz Network Name (SSID) on your WiFi device .
Under the WiFi settings, the list of available networks should appear. Select your business network (such as CBCI-XXXX-2.4) from Step1.Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (13)

Enter the Network Key (Password) on your WiFi device .
When prompted, enter the case-sensitive Network Key (Password) from Step 1. Tap the confirmation button—usually labeled Join, Connect, or OK.

Check if your WiFi device is connected to your 2.4 GHz network.
If your WiFi device is connected, you should see a checkmark (or other indication) next to the Network Name (SSID) you had selected.Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (14)

Test your Internet connection on your WiFi device .
Open a web browser (i.e. Internet Explorer, Chrome, Safari, Firefox), and try to access a site, such as www.xfinity.com. Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (15)

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

Step 3. Connect to Your XFINITY WiFi Hotspot

Your Business Wireless Gateway also broadcasts a Public WiFi network with the SSID for your customers and patrons. This network provides a separate and secure method for guests to access the internet while at your business. As a Comcast Business Internet customer, you also have access to this hotspot and the broader XFINITY WiFi network of hotspots around town.

Log in to XFINITY WiFi:

  1. Select the “xfinitywifi” Network Name (SSID) from available networks on your wireless device.
  2. Open a browser window. On some systems, such as Apple iOS, a browser screen will appear automatically.
  3. Follow the on-screen prompts to log in with your Comcast Business Internet credentials.
    Congratulations! Now that you’ve logged in, you will be automatically signed in whenever you are near an XFINITY WiFi Hotspot around town.
    Note: Comcast Business Internet should be unaffected by the Business Public WiFi service. Your Business Private WiFi network, as well as Business Public WiFi, use shared spectrum, and as with any shared medium there can be some impact as more devices share WiFi.
Step 4. Log In and Secure the Admin Tool

You can manage your network and security settings using the Business Wireless Gateway’s Admin Tool. To ensure better security for your Business Wireless Gateway and network, we recommend changing the default password to a password of your own.

  • A. Open a web browser from a connected wired or WiFi deviceComcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (16)http://10.1.10.1 and the Login page appears.
  • B. Enter cusadmin for Username.1 Enter highspeed for Password.
  • C. Click LOGIN and the At a Glance page appears.
  • D. In the upper right corner, click CHANGE PASSWORD for Increased Security (recommended).
    1. Enter “highspeed” 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.

Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (17)

  1. The username “cusadmin” cannot be changed.Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (18)
  2. The 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.

Business Wireless Gateway enables you to personalize your business network. Features that can be customized using the Admin Tool include:

  • Content 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 > WiFi.
      For more information about the Business Wireless Gateway, visit
      http://mydeviceinfo.comcast.net and download the manufacturer’s User Guide.

WiFi Connectivity Tips

If you’re having trouble connecting a WiFi deviceComcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (19) to your 2.4 and 5 GHz WiFi networks (or if neither network appears in the available networks list), 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 1. Move the WiFi device next to the Business Wireless Gateway.
  • Tip 2. On the WiFi device, turn the WiFi setting off and then on.
  • Tip 3. Restart the WiFi device by powering off and then on. Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (20)
    If none of the above tips resolve your connection issue, reset the Business Wireless Gateway.
    Caution: Resetting the Gateway will disrupt Business Internet services for a minute or two.

Following are two ways to reset the Business Wireless Gateway.

  • 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 Business Wireless Gateway (such as passwords, content controls, or firewall settings) will be lost. Comcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (21)

Business Wireless Gateway
Where you put the Business Wireless Gateway in your business can affect your connectivity, range (operating distance), and performance of connected WiFi devices
For optimal results from the Business Wireless Gateway, follow these guidelines to identify the ideal location.

  • Place the Business Wireless Gateway 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 Business Wireless Gateway and your WiFi devices.
  • Place the Business Wireless Gateway away from electronics that may cause interference (such as cordless phone bases).

GHz in Your Business

Most WiFi networks primarily operate in the 2.4 GHz frequency band only, but the increasingly popular 5 GHz networks offer significant advantages. With dual-band WiFi 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 WiFi consumer electronic devicesComcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (22), such as:
    • Tablets
    • Laptops
    • HD TVs
    • Mobile Phones
    • Game Systems

About WiFi and the Business Wireless Gateway

  • Not all WiFi devicesComcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (23) 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 WiFi device supports 5 GHz, check the manufacturer’s documentationComcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (24)
  • Although the Business Wireless Gateway simultaneously broadcasts both 2.4 and 5 GHz, WiFi devices can connect to only one Wi‑Fi network at a time
  • 5 GHz WiFi signals may not travel as far as 2.4 GHz. In areas of your business that are furthest away from the Business Wireless Gateway, 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 WiFi devicesComcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (25).
    If you’re connected to the Business Wireless Gateway’s 5 GHz network and move out of the 5 GHz range (move to a different room), your WiFi deviceComcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (26) 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 WiFi settings (p. 3-4) to reconnect to the Wireless Gateway 2’s 5 GHz network in order to experience its benefits.
  • The WiFi barsComcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (27) on your WiFi deviceComcast Business DPC3939B Wireless Gateway User Manual - Manuals+ (28) indicate signal strength.
  • Some WiFi devices support WiFi Protected Setup (WPS). WPS lets you set up secure WiFi networks without manually entering your WiFi network information. Pressing the WPS button on the Business Wireless Gateway initiates WPS for both 2.4 and 5 GHz WiFi bands. You can then connect to either band using WPS.
    Learn about the Business Wireless Gateway at http://business.comcast.com/help. For questions about your Comcast Business services, call 800-391-3000.

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 their respective owners. © 2014 Comcast. All rights reserved.

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