FAQ

By creating a user custom name (FEN name) simply from a DirectIP NVR, its device info and

network parameters (including Device name, MAC address, IP address, port info, NAT type, product

info etc.) are automatically registered in the DirectIP FEN server running in the cloud. The user is

able to access the site remotely using this custom name instead of an IP address, as the FEN

server holds of the local device’s connection on the network even in a DHCP environment with

dynamic changing IP.

FEN service uses UDP hole punching for NAT traversal to gather address information of two ends, an NVR and a remote client, and NAT type in a site where an NVR is or a remote client is should support UDP communication.

[NAT types supporting UDP communication]

- Open internet

- Cone types (Full cone, Restricted cone, Port restricted cone)

[NAT types not supporting UDP communication]

- UDP blocked

- Symmetric

- Symmetric UDP firewall

For audio detection, the device (ex. DirectIP camera) calculates the average power of the audio signal that is transmitted for a specific time (6.5 seconds).
If the current audio signal’s power is much higher than the power threshold of the audio signal (based on the average power of the audio signal), then audio detection is enabled.
That is,
1. Gather audio signal for 6.5 seconds
2. Calculate the average power of the audio signal
3. Compare the current power of the audio signal with the power threshold of the audio signal
4. Decide whether audio is detected or not.
 
The threshold of power level is determined by the audio sensitivity level.
* Sensitivity level 1: two times (6dB) higher than the average power of the audio signal
……..
* Sensitivity level 5: 1.2 times (1.6dB) higher than the average power of the audio signal

External IP address means the IP address on the public internet side. Commonly our PC might have the internal IP address range which is assigned from gateway such as NAT(Network address translation).

NAT helps us to use one public internet IP over many network devices.

The reason that you have to check the external IP address is that it is needed to connect the NVR or camera from the internet. The client uses the external IP to reach the target.

You can check the external IP address if you visit the following sites.

http://whatismyipaddress.com

http://www.whatsmyip.org

DDNS is Dynamic DNS(Domain Name System).
ISP(Internet Service Provider) is changing periodically an IP address to use limited IP range effectively.
To maintain the connectivity with the server anytime, the client has to know the IP address of the server.
But it’s not easy to track the IP address which is being changed constantly.
Therefore, DDNS is needed.

DDNS always tracks and keeps the available IP address of the server. When the client inquires the information to connect the server, DDNS service responds to a request. So that the client can connect to the server correctly with the connection information.

To minimize packet loss, the wiring has to be aligned exactly according to the standard.
The ordinary alignment is called 568A and 568B. It was established by TIA(Telecommunications Industry Association)/EIA(Electronic Industries Alliance).
Cable alignment 568A and 568B are below.

If both end patches are assembled as T568B, the cable can be used for ordinary LAN cable for CAT5, CAT5e, CAT6.

In case of a crossover cable, one of patch cords shall be a type of T568A, another one shall be a type of T568B. Nowadays most ethernet adaptors support to recognize the type of connector between T568A and T568B.

If you can’t see any images on a monitor, please check the following points.

- Check the monitor is turned on and video input cable is connected to the NVR correctly. Also, check whether the monitor cable has no defect.
- Check the display mode of the monitor is set to the input source (HDMI or VGA) correctly. 
- Restart NVR and check the video is displayed on the monitor within 3 minutes. If NVR is restarted, the video resolution is adjusted automatically when video resolution between NVR and the monitor is not the same.
- If you have another monitor, replace the monitor and restart NVR. If the video is still not displayed on another monitor properly, please report the problem to our customer support.

Normally, NVRs or network switching hubs are PSEs (Power Sourcing Equipments) and have no consideration about the PoE and DC power because they generate the PoE power using DC power and have no collision between PoE and DC power.
However, cameras are PDs (Powered Devices) and should select one of PoE or DC power if both powers are supplied. So, if both PoE and DC power are supplied to the camera, the camera uses DC power first and sends a power status message to PSE via signal lines, then PSE recognizes that the camera is using DC power and stops supplying PoE power to the camera.

Yes. DirectIP supports plug and play functionality. If you connect the camera’s cable to NVR’s DirectIP port, you can see the camera’s image on the monitor connected with NVR. However, NVR shows the camera’s image sequentially according to the camera’s connection sequence regardless of NVR’s DirectIP port number. So, if you want to fit the image display sequence to NVR’s DirectIP port number, you need to rearrange the display sequence of NVR’s video image.