Common Questions

Sunday, 1 January 2017  |  Admin

Digital Video Recorder's Common Questions

What are the common Interfaces for the Digital Video Recorders?

BNC - Bayonet Nut Connector - One of the connectors used in coaxial-cable which could effectively block the signal interference. It used for coaxial-cable to transmit composite analog signal (CVBS).Characteristic impedance is 75Ω.

RCA - Radio Corporation of America - RCA is invented by the Radio Corporation of America and has become one of the standard interfaces of audio signals and video signals. It could be used for analog video, analog audio, digital audio and color component video transmission. When it is used for CVBS transmission, coaxial-cable with the75Ω Characteristic impedance is always been adopted. However, BNC interface which is more reliable is more frequently adopted in video surveillance project.

SDI - Standard Data Interface - It includes HD-SDI and SD-SDI

HDMI - High Definition Multimedia Interface - Audio & Video signal could both be transmitted compared to DVI. Transmit distance could reach 15 meters.

VGA - Video Graphics Array - VGA interface always comes with 15 cores of D-SUB. The disadvantage of VGA is that it is proposed for analog display device such as CRT. When being adopted in digital display devices such as LCD and TFTP, video signal requires D/A and A/D conversion which would influence the image quality as well as the response speed


What is the Main-stream and Sub-stream?

The Main Stream with high resolution and full frame rate is can be used for main monitoring and recording.

The sub stream with lower resolution can be used for mobile monitoring.  Some devices support third stream which offers more flexible choices.


CCTV Camera's Common Questions

4in1 Camera has black screen or is in Black and White?

If you are getting no video or black and white video on your DVR from your camera and you are using 4 in 1 camera's this is nothing to worry about.

All this means is the camera is in the incorrect output mode. You can change the mode which your camera is in by using the controller which is connected to your camera.


4 in 1 camera controler


Your input controller will look like the one above. To change the camera into the right setting you will need to use the controller that is on you camera. Please be aware that depending on which DVR you have, each signal input my be in a different direction. To change the output of the camera you will need to push the button on the controller into the correct direction for 5 seconds the release, once you have released the button your camera will restart. Once it has restarted if you have changed it to the correct output you will see full colour on your screen.

For example if I wanted to change my camera to TVI then I would hold the button to the right for 5 seconds, then i will release then button once the camera has restarted then the camera will be in TVI mode.



Quick Technical Question's

Theres a bleeping sound coming from the DVR?

If your DVR is making any sort of beeping sounds, it is most likely a hard drive fault. ​If you do not have over right selected then your DRV will beep to notify you to tell you that your hard drive is full. However your DVR will also beep if your hard drive has become faulty. Hard drives can become faulty anytime due to moving parts within them. If you have bought your DVR with the hard drive then it comes with a full warranty of 1 year warranty, so if you hard drive has failed we will replace it free of charge.


What is the Maximum Distance For PoE cables?

The maximum distance when using CAT5e cable is 100m (333ft) between the two PoE devices (NVR and PoE camera).


What do the PoE lights mean?

Whats is the meaning PoE indicator lights? 

Usually one set of indicators lights include a yellow light and also a green light which are integrated with the Ethernet interface together (see the picture listed bellow.

(please note depending on which Network Video Recorder (NVR) you have the back may look different however you should still have the yellow and green led lights)

Yellow light means connection status. ti will light once the device is connected. Green light means data interaction status. the indicator light begins to flash once data come in or go out. The bigger the data stream the more frequently it flashes.