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Page 131 / 149 Scroll up to view Page 126 - 130
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D-Link DCS-34±0 User Manual
Section ² - Troubleshooting
1. What is an Internet Camera?
The Internet Camera is a stand-alone system connecting directly to an Ethernet or Fast Ethernet network. It differs
from a conventional PC Camera, the Internet Camera is an all-in-one system with built-in CPU and Web-based
solutions providing a low cost solution that can transmit high quality video images for monitoring. The Internet
Camera can be managed remotely, accessed and controlled from any PC/Notebook over an Intranet or the Internet
from a Web browser.
2. What is the maximum number of users that can be allowed to access DCS-3420 simultaneously?
The maximum number of users that can log onto the Internet Camera at the same time is 10. Please keep in mind
the overall performance of the transmission speed will slow down when many users are logged on.
3. What algorithm is used to compress the digital image?
The Internet Camera utilizes MPEG-4 simple profile image compression technology to provide high quality images.
4. Can I capture still images from the Internet Camera?
Yes you are able to capture still images with the snapshot function from the software application CD supplied with
the Internet Camera or with the snapshot function on the Home page using an Internet browser.
5. Can the Internet Camera be used outdoors?
The Internet Camera is not weatherproof. It needs to be equipped with a weatherproof case to be used outdoors
and it is not recommended.
6. When physically connecting the Internet Camera to a network what network cabling is required?
The Internet Camera uses Category 5 UTP cable allowing 10 Base-T and 100 Base-T networking.
7. Can the Internet Camera be setup as a PC-cam on a computer?
No, the DCS-3420 Internet Camera is used only on an wireless 802.11g, Ethernet or Fast Ethernet network.
Troubleshooting
Page 132 / 149
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D-Link DCS-34±0 User Manual
Section ² - Troubleshooting
8. Can the DCS-3420 be connected to the network if it consists of only private IP addresses?
Yes, the Internet Camera can be connected to a LAN with private IP addresses.
9. Can the DCS-3420 be installed and work if a firewall exists on the network?
If a firewall exists on the network, port 80 is open for ordinary data communication. The DCS-3420 uses port 5002
for streaming audio and port 5003 for streaming video. These ports (or the ports you specify from the Advanced
Tab in the Configuration screen if you change the default ports) need to be opened on the firewall. Please refer to
page 129 for more information.
10. Why am I unable to access the DCS-3420 from a Web browser?
If a router or firewall is used on the network, the correct ports for the DCS-3420 may not be configured on the
router or firewall. To correct the problem, you
need to determine if the DCS-3420 is behind a router or firewall and
if the router or firewall is properly configured for the ports the DCS-3420 is using. Refer to page 129 for help in
opening the correct ports on a router or firewall for use with the DCS-3420. Other possible problems might be due
to the network cable. Try replacing your network cable. Test the network interface of the product by connecting a
local computer to the unit, utilizing a Ethernet crossover cable. If the problem is not solved the Internet Camera
might be faulty.
11. Why does the Internet Camera work locally but not externally?
This might be caused by
network firewall protection. The firewall may need to have some settings changed in
order for the Internet Camera to be accessible outside your local LAN. Check with the Network Administrator for
your network.
Make sure that the Internet Camera isn’t conflicting with any Web server you may have running on your network.
The default router setting might be a possible reason. Check that the configuration of the router settings allow the
Internet Camera to be accessed outside your local LAN. Please refer to page 129 for more information.
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D-Link DCS-34±0 User Manual
Section ² - Troubleshooting
12. I connected the Internet Camera directly to a computer with a cross-over cable Ethernet cable and
received the following Windows error upon running the Installation Wizard:
This Windows error will occur if the Internet Camera is connected to a computer that is not
properly configured with a valid IP address. Turn off DHCP from the Network Settings in
Windows and configure the computer with a valid IP address, or connect the camera to a router
with DHCP enabled. (See page 140)
This error can also occur if the Installation Wizard icon is clicked on more than once from the
setup wizard.
13. Noisy images occur. How can I solve the problem?
The video images might be noisy if the Internet Camera is used in a very low light environment. To solve this issue
you need more lighting.
13. The images appear to be of poor quality, how can I improve the image quality?
Make sure that your computer’s display properties are set above 256 colors. Using 16 or 256 colors on your
computer will produce dithering artifacts in the image, making the image appear to be of poor quality.
The configuration on the Internet Camera image display is incorrect. Through the Advanced > Image Setting
section of the Web management you need to adjust the image related parameters
such as brightness, contrast,
hue and power line frequency for fluorescent light. Please refer to the Advanced > Image Setting section on Page
44 for detailed information.
Page 134 / 149
134
D-Link DCS-34±0 User Manual
Appendix A - Wireless Basics
D-Link wireless products are based on industry standards to provide easy-to-use and compatible high-speed wireless
connectivity within your home, business or public access wireless networks. Strictly adhering to the IEEE standard,
the D-Link wireless family of products will allow you to securely access the data you want, when and where you want
it. You will be able to enjoy the freedom that wireless networking delivers.
A wireless local area network (WLAN) is a cellular computer network that transmits and receives data with radio signals
instead of wires. Wireless LANs are used increasingly in both home and office environments, and public areas such
as airports, coffee shops and universities. Innovative ways to utilize WLAN technology are helping people to work and
communicate more efficiently. Increased mobility and the absence of cabling and other fixed infrastructure have proven
to be beneficial for many users.
Under many circumstances, it may be desirable for mobile network devices to link to a conventional Ethernet LAN in
order to use servers, printers or an Internet connection supplied through the wired LAN.
A Wireless Router is a device
used to provide this link.
Wireless Basics
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D-Link DCS-34±0 User Manual
Appendix A - Wireless Basics
What is Wireless?
Wireless or WiFi technology is another way of connecting your computer to the network without using wires. WiFi uses
radio frequency to connect wirelessly, so you have the freedom to connect computers anywhere in your home or office
network.
Why D-Link Wireless
?
D-Link is the worldwide leader and award winning designer, developer, and manufacturer of networking products.
D-Link delivers the performance you need at a price you can afford. D-Link has all the products you need to build
your network.
How does wireless work?
Wireless works similar to how cordless phone work, through radio signals to transmit data from one point A to point
B. But wireless technology has restrictions as to how you can access the network. You must be within the wireless
network range area to be able to connect your computer. There are two different types of wireless networks Wireless
Local Area Network (WLAN), and Wireless Personal Area Network (WPAN).
Wireless Local Area Network (WLAN)
In a wireless local area network, a device called an Access Point (AP) connects computers to the network. The access
point has a small antenna attached to it, which allows it to transmit data back and forth over radio signals. With an
indoor access point as seen in the picture, the signal can travel up to 300 feet. With an outdoor access point the signal
can reach out up to 30 miles to serve places like manufacturing plants, industrial locations, college and high school
campuses, airports, golf courses, and many other outdoor venues.

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