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D-Link DCS-920 Wireless-G Internet Camera Review
I bought DCS910 in Nov.2008 and DCS920 one month later. I am quite satisfied with both of them and I did not meet any problem till now, or say I could solve the problems that I have found.The network attached camera supports up to 640x480 in resolution. It is higher then lots of other network attached camera which has only 320x240. So the image quality is quite good. It has good vision in dim light. you could see image or video on your web browser. It supports both MS ActiveX and Sun Java for live video monitoring but it does NOT support sound :(
You may need to install ActiveX control plug-in and Sun Java plug-in for your browser to support live video.
The supplied DViewCam software also supports monitoring up to 32 cameras and you could record videos into computer hard disk. I have not used video record feture till now because it requires turning on computer and consumes too much router/switch band width. I think check from web from time to time is good enough for my needs.
It support user account management, NTP time sync, DDNS name service, FTP and email deliver of photos at the frequency you defined.
The device does not support SSL protocol, so your password could not be encrypted for delivery. So you could not use https or ftps for secured communication. But this is understandable because encryption cost too much resources for the embeded system. You could not expect too much from tiny embeded device. Anyway, normal web access and FTP upload are good enough if you do not have too much security concern.
It is quite simple to access the device from within the internal/home network because you PC and the camera are in the same network segment. But if you want to access the device from external/Internet, there are some other things to take care. You need to have some basic networking concept for the setup.
I have seen one user complain the tech support and blame the device to be not usable. I could understand the mensioned situation. It is not the user's fault nor the product's fault. Tech support is not wrong on what they said but they should explain clearly on the technical background and guide the user for a smooth set up. User is not network expert so it will be a little difficult for them to understand and follow the network rules.
Normally, ISP will only give one dynamic IP address to a user. The IP address will change when you turn on the router or after a certain period of time. So you need to keep track to your current IP address on the WAN port of your router. This is usually done by register a DDNS service(free or paid service). Most router support DDNS auto update service and this camera also supports it but you need to set it up in your device. All the devices in your home network will share this single IP address. Network applications will monitor communication port for TCP/IP communication. Different devices in your network have different unique IP address. The IP address for a specific device is unique in the network. So if you want to access your camera through the internet in a remote location, you need to have DDNS service set; set up a internal static IP address to your camera; setup your router port forward to your camera IP address. For example, use http://dcs910.mydomainname.com:9011/ to access your camera, you need to buy(or register a free child domain name from some website) your domain name 'mydomainname.com'; register your domain name to a DDNS server(paid or free service); setup your router to auto update DDNS for your current IP address; set router to forward 9011 port request to the 80 port of the static internal IP address that you have assigned to your camera(such as 192.168.0.3 depends on the settings on your router and camera). You may need an experienced friend to help you for the setting.
Even if you have set everything correctly, it not necessarily means you could watch live video in your office. You should be able to access static current image from web browser in your office but live video is another story. Normally office network is protected by firewall on gateway. Most office firewall uses proxy and only open ports for web requests and some predefined application ports and bann all other communications. The ActiveX and Java live video of this device may need dedicated port connection to open communication session but this will not be allowed by default on the proxy. So unless you know your network administrator and could ask them open the port for you, you will not able to access live video in office. This is not the problem of the device, it is the rule of the network security. But anyway, you could see still image of your home which is good enough.
I have used my DCS910 and DCS920 for 3 months and I am quite satisfied with the device. I would like to highly recommand this device to you for its clear image, easy setup(if you understand networking in and out), and resonable price.
D-Link DCS-920 Wireless-G Internet Camera Overview
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