HIKVISION DS-7108HI series User Manual page 99

channel needed for every hour, unit Mbyte.
Step 2: After video time requirement is confirmed, according to Formula (2) to calculate the
m
storage capacity , which is storage of each channel needed unit Mbyte.
i
Step 3: According to Formula (3) to calculate total capacity (accumulation)
all channels in the DVR during scheduled video recording.
Step 4: According to Formula (4) to calculate total capacity (accumulation)
all channels in DVR during alarm video recording (including motion detection).
= ÷ ×
q d 8 3600
i i
d
In the formula: means the bit rate, unit Kbit/s
i
× ×
m q h
=
i i i
In the formula:
h
means the recording time for each day (hour)
i
D
means number of days for which the video shall be kept
i
=
q
T
c
In the formula: means total number of channels in one DVR
=
q
T
In the formula：a% means alarm occurrence rate
99
÷
1024
D
i
c
∑
m
i
=
i 1
c
∑
×a%
m
i
=
i 1
(1)
(2)
q
that is needed for
T
(3)
q
that is needed for
T
(4)