30 General Q. How can IDIS device detect the audio input event? 2015-07-06

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

29 General Q. How to check the current external IP address 2015-07-06

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.



28 General Q. What is DDNS? 2015-07-06

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.

27 General Q. How do I make a Cat5, Cat5e or Cat6 patch or crossover cable? 2015-07-02

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.



T568A Color

T568B Color

Pins on patch cord


green/white stripe

orange/white stripe


green solid

orange solid


orange/white stripe

green/white stripe


blue solid

blue solid


blue/white stripe

blue/white stripe


orange solid

green solid


brown/white stripe

brown/white stripe


brown solid

brown solid

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.


26 Video Recorder Q. Can I use other brand's network camera with IDIS NVR? And, which kind of cameras is supported? 2015-03-24

Yes. Our NVRs support the Axis, Panasonic, and OnVIF network protocols for other brands' network cameras. So if your camera has one of the protocols mentioned above, it can be used with our NVRs though the performance is not as good as the DirectIP cameras. Of course, our non-DirectIP network cameras can connect with our NVRs.

25 Camera Q. What is Smart IR? 2015-03-23

Normally, when a camera uses infrared LED arrays for wide-area illumination at night, you may see the overexposure image when the object is closed to the IR camera.
Smart IR technology automatically adjusts IR intensity according to proximity and eliminates object overexposure caused by strong illumination. Smart IR is useful to identify a person’s face or an object movement at night.

24 Camera Q. Can I use DirectIP cameras with other 3rd party NVRs? like Milestone? 2015-03-23

If you wish to connect DirectIP cameras to non-DirectIP NVR or VMS, you should change the DirectIP camera’s protocol to ONVIF protocol using our INIT (Integrated Network Installation Tool) software. If the cameras are rebooted after the protocol change, the DirectIP camera will operate as an ONVIF camera.

23 Camera Q. Do DirectIP cameras have spot output? 2015-03-23

Many DirectIP cameras have spot output. By spot output, the image can be seen during the installation in the NTSC/PAL D1 resolution. But, some cameras do not support spot output. So, you should check whether your cameras support spot output or not.
Spot output ports are broken into two types - RCA and terminal block. If you want to use spot output, you should check the spot output port type of your camera.
Spot output on DC-X1XXX series camera works until the camera is registered to a DirectIP NVR.

22 Video Recorder Q. What is the difference between Standalone NVR and PC-based NVR? 2015-03-23

There are two types of NVR: Standalone NVR and PC-based NVR. The Standalone NVR is mostly built on Linux OS (Operating System) based system designed for embedded processors, while the PC-based NVR is mainly MS Windows OS based system designed for PC platforms with dedicated boards for video surveillance.
* Benefits of a Standalone NVR
 - Usually less expensive
 - Takes less physical space (easy to hide in a safe place)
 - Safer from malware and viruses
 - Quiet in operation
 - Lower power consumption

* Benefits of a PC-based NVR
 - Gives better features such as video analysis, high-quality user interface, etc.
 - Able to have thousands of user accounts
 - More expandable hardware and software components
 - Easily maintain, change or upgrade hardware and software components

21 Video Recorder Q. What does a ‘Network Throughput’ mean in the NVR? 2015-03-23

A network throughput in the NVR means local and remote multimedia data transmission rates of the network port in the NVR. For example, if maximum network throughput for local multimedia data recording and monitoring are 200Mbps and 50Mbps, respectively, and maximum network throughput for remote multimedia data transmission is 10Mbps, then maximum network throughput of the NVR is 260Mbps, which is calculated as the sum of local and remote multimedia data throughput. Using a network throughput, the total number of IP cameras connected to an NVR can be determined for real-time video monitoring and recording. That is, network throughput is important information to design and construct the NVR based network surveillance system.

20 Video Recorder Q. Can I swap eSATA storage while NVR is working? 2013-05-05

No. Currently, eSATA ports in NVR do not support hot swapping. So, you should connect eSATA storage to NVR before NVR is powered up. Otherwise, NVR does not recognize eSATA storage. On the other hand, if  eSATA storage is swapped out while NVR is working, NVR can detect that situation and record data to another HDD.

19 Video Recorder Q. Is it possible to carry one HDD from a specific NVR to another and retrieve it? 2013-04-28

Yes. NVR can retrieve and display the recoded audio/video data in HDD carried from another NVR.
However, NVR classifies another NVR’s HDD to the ‘other HDD’ type and does not support data recording until the HDD is formatted. That is, if you want to record data to the HDD carried from another NVR, you should back up the HDD's data to an alternative storage device if needed, then format the HDD.

18 Video Recorder Q. What kind of methods can I use with my ATM/POS machine to be integrated with NVR? 2013-04-28

To communicate with ATM/POS machine, NVRs have various hardware ports such as RS232C, USB, and RJ45 Ethernet port, and some NVRs have RS485 port additionally.
About data protocols, NVR supports Epson, VistaATM, XApCom232, XApComIP protocols. Also, at generic text mode, users can set the transaction start/end text and line delimiter by user-defined characters. You can select the hardware port and protocols on the NVR’s setup menu. For further detail, please refer to the ‘Text-In’ configuration in each NVR’s manual.

17 Video Recorder Q. Can I use my existing analog cameras with NVR? 2013-04-28

Yes. you can use conventional analog cameras with the NVR by adding network video encoders.
The network video encoder such as DE-1101 converts an analog video signal to a network video signal and supports the DirectIP protocol.
If you use the network video encoder supporting DirectIP protocol, analog cameras can communicate with NVR by DirectIP protocol.

16 Video Recorder Q. What is the audio codec technology used in NVR? 2013-04-28

Currently, G.711 u-Law, G.711 a-Law, ADPCM 16KHz, or G.726 audio codecs have been applied to the recorder. Please refer to the A&E specification for audio codec information applied in each product.