In order to access a DVR or IP camera registered in the WRS through Internet Explorer, it shall have a unique domain name. A service to give a domain name to the equipment registered in the WRS is called WNS.

The RS-232, RS-422 and RS-485 are kinds of circuit interfaces.

There are RS422 and RS485 to combine RS232 with many ones in the serial communication.(232 communication distance 25m / 485 communication distance 2km)

We can see a case that when entering a domain into the address window, a completely different domain, not the entered domain, appears and moves to the relevant site. Clicking the relevant domain automatically goes to the designated site, so this case is called forwarding. A portforwarding is a function to transmit a packet by changing its port to a private IP when a picket comes into a particular port in the vacant IP side.

KT Corporation : 168.126.63.1 / 168.126.63.2 or 61.74.63.1
Hanafos : 210.220.163.82 /
Hanaro : 131.107.1.7 /
Thrunet : 210.117.65.1 / 210.117.65.2
Shinbiro : 202.30.143.11 / 203.240.193.11
Dacom : 164.124.101.2 / 203.248.252.2

A router interconnects network tiers as a device to connect a separated network using the same transmission protocol. The router determines a node within another network or its own network according to the path assignment table by being added to a function of the bridge.
And this selects the most efficient path among many paths and sends a packet. The router performs flow control, composes many subnetworks in an Internet network, and executes various network control functions. Taking a simple look at the difference between a bridge and a router, a router not only takes charge of a function up to a network tier but also sets a path, whereas a bridge selects and determines a simple path depending on destination addresses only with a function up to the data link tier.

A gateway is a network point playing a role of an entrance to another network. In terms of routing, Internet can be said to be a network composed of many gateway nodes and host nodes, so the computers of network users and the computers providing contents such as a web page are just the host nodes, and the computers controlling traffic within the network of general companies or the computers of Internet service provides are just the gateway nodes. There is often a case that in the network of a company the computers playing a role of gateway nodes execute the role of a flexible server or firewall server together. A gateway requires the use of a router, switch, etc.

When using a sharer, basically all the network connection coming from the outside of the sharer is intercepted for itself for security and not transmitted to the equipment(DVR or IP camera) connected to the bottom of a sharer. A DMZ means a function to provide all the services provided by the equipment to the outside without restriction although the equipment becomes defenseless(DMZ) against the external network connection by directly connecting a piece of equipment connected to the bottom of a sharer to all the external connections exceptionally.
When connecting a DVR or IP camera to a router(sharer), you should open the necessary ports one by one by using a 'port forwarding' function to access the relevant equipment through Internet, but registering the relevant equipment to the 'DMZ' of a sharer can automatically connect all the external access requests to the registered equipment, so it has an advantage of not needing a separate port forwarding setup.

1080p - Progressive method of 1920x1080 definition
1080i -  Interlace method of 1920x1080 definition
WEBGATE's HD DVR supports a 1080p and 30fps HD-SDI camera only.
For an exact image format, refer to the manual.

SD(Standard Definition) : The standard definition(SD) refers to 720x480(NTSC) and 720x576(PAL) definition. This is a screen size made according to the analog TV broadcasting standard.

HD(High Definition) : The high definition(HD) is a general term referring to an image system having higher definition then the image of standard definition(SD). This often refers to screen definition of 1280x720 (720p), 1920x1080 (1080i, 1080p), etc. The 1920x1080 is especially called Full-HD.

When connecting a DVR and Network Camera to the Internet(network), if it is connected to a floating IP, not a fixed IP, then an arbitrary IP can be given or the IP can be automatically changed.
In this case, the user cannot check the changed IP and thus cannot access the relevant unit through the network. In order to solve this, our company established a server to register an equipment IP independently, which is under service and whose relevant service name is WRS(Webgate Registration Service). The DVR registered in the WRS can be accessed through a CMS.