Sony SNC-CS50P - Manual (Page 6)

6
Bandwidth and Storage Capacity Calculations
When designing your surveillance system, it is essential to
prepare a sufficient amount of storage and network
bandwidth. The following is an example showing how to
calculate the required network bandwidth and storage
capacity to transmit and store JPEG images.
MPEG-4/H.264
Because of the nature of MPEG-4 and H.264, it is very
difficult to accurately calculate required network
bandwidth and storage capacity as we did with JPEG. As
explained above, these compression methods are based
on the difference in movement within a scene; therefore,
scenes with little movement require less data than scenes
with significant movement.
The MPEG-4 and H.264 bandwidth settings in these
cameras can be preset to any of the nine levels as follows:
MPEG-4: 64, 128, 256, 384, 512, 768, 1024, 1536, 2048 Kb/s
H.264: 32, 64, 128, 256, 384, 512, 768, 1024, 1536 Kb/s
*5 This table shows sample calculations for reference purposes only. Actual bandwidth and storage requirements should be properly tested with each system
installation.
*6 Maximum frame rate might be limited depending on compression level, resolution, and camera function settings. For more details, please contact your
local Sony sales office or authorized dealer.
JPEG
Formulas for Calculating Bandwidth and Storage
Capacity
Bandwidth =
(Mb/s)
Image data size (KB)
frame
# frames
sec
8 bits
Byte
1 M Byte
1000 KB
Storage capacity =
(MB/hour)
Image data size (KB)
frame
# frames
sec
3600 sec
hour
1 MB
1000 KB
Storage capacity =
(GB/day)
Storage capacity (MB)
hour
24 hours
day
1 GB
1000 MB
Sample Calculation for a Four-Camera Installation *5
Resolution Image fps *6 Bandwidth Required Required
Compression data size storage storage
level capacity/hour capacity/day
Camera1 VGA 30 KB 30 fps 7.2 Mb/s 3240 MB 77.76 GB
Level 5
Camera2 QVGA 7.5 KB 10 fps 0.6 Mb/s 270 MB 6.48 GB
Level 5
Camera3 QVGA 4.5 KB 10 fps 0.36 Mb/s 162 MB 3.88 GB
Level 2
Camera4 QQVGA 1.875 KB 20 fps 0.3 Mb/s 135 MB 3.24 GB
Level 5
Totals 8.46 Mb/s 3807 MB/hour 91.36 GB/day