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Comparison Dahua NVR2104-4KS2 vs Dahua DH-NVR2104-S2

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Dahua NVR2104-4KS2
Dahua DH-NVR2104-S2
Dahua NVR2104-4KS2Dahua DH-NVR2104-S2
from £82.56 
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Typedigital NVRdigital NVR
Camera connection4 channels4 channels
Features
Features
PTZ
motion response
mobile app
PTZ
motion response
mobile app
Connectors
RCA audio input11
RCA audio output11
USB 2.022
HDMI1
/maximum 1920x1080 px/
VGA1
/maximum 1920x1080 px/
LAN11
LAN speed100 Mbps
Video recording
Bandwidth80/- Mbps
Resolution (all channels)1920x1080 px1920x1080 px
Frame rate30 fps25 fps
Video compression formatH.265, H.264H.264
Max. resolution (IP)8 MP (~3840x2160 px)6 MP (~3072x2048 px)
Drives
Number of SATA11
Max. total capacity6 TB
6 TB /1x6TB/
General
Power supply12В12В
Power consumption
3 W /without hard drive/
2.4 W
Operating temperature-10 °C ~ +55 °С-10 °C ~ +55 °С
Maximum humidity90 %90 %
ONVIF
CMS
Dimensions204.6x204.6x45.6 mm204.6x204.6x45.6 mm
Weight0.45 kg0.4 kg
Added to E-Catalogoctober 2018november 2016

LAN speed

The maximum data transfer rate supported by the DVR's LAN ports.

Note that for simple tasks, a rather modest by modern standards speed of 100 Mbps is often enough. However, high bandwidth ( 1 Gbps) not only simplifies the transfer of large amounts of data, but also helps to reduce lags and improve the overall quality of communication; and modern technologies make it possible to provide support for gigabit LAN even in fairly simple and inexpensive registrars.

Of course, in order to use all the features of the LAN, it is necessary that the devices connected to such ports also support the appropriate speeds.

Bandwidth

The maximum data stream in Mbit/s that the NVR is capable of processing when recording and displaying. The throughput parameter is specified as the maximum incoming/outgoing speed, or as the sum of incoming and outgoing streams (total throughput). It is calculated in such a way that the throughput exceeds the total flow of all IP cameras connected to the DVR, and another 25–30% is put in reserve for playing video or viewing it via network access.

Frame rate

The highest frame rate in the recorded video that the recorder can support when recording from all available channels simultaneously. If not all channels are occupied by cameras, this figure may be higher.

The minimum required for comfortable viewing is 24 fps. And in the most modern video standards, the frame rate can be much higher — 50 – 60 fps. Higher values result in better quality and smoother video that allows you to clearly see fast movement; however, such video takes up more space and requires powerful hardware, which affects the price of recorders.

Video compression format

Standards (codecs) used by the recorder to compress the recorded video.

This parameter is important when viewing recorded materials on another device — for example, a media centre, into which a "flash drive" with files from the recorder is inserted. For normal viewing, it is necessary that the player supports the appropriate codec — otherwise the video will be displayed with distortion or will not work at all. Technical details on various standards can be found in special sources.

Note that if you plan to view the materials on a computer, you can not pay much attention to this parameter: most modern operating systems have extensive built-in sets of codecs, and if you don’t have the right codec, you can easily find it on the Internet.

Max. resolution (IP)

The maximum supported resolution of IP cameras with which the NVR is technically capable of working (primarily recording). With rare exceptions, devices record in maximum resolution from all connected IP cameras. However, the limiting factor here is bandwidth (see the relevant paragraph) – depending on the shooting conditions, it may not be enough.

High resolution allows you to get a more detailed image in which fine details are better visible. On the other hand, such videos take up large amounts of disk space, and their support significantly affects the cost of the device.
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