79
/
85
Coaxial cable connector, composite video signals or audio signals, commonly use 75 ohm connectors.
BNC welding and should pay attention to weld strength and remove burrs, or the signal wire and
shield’s contact will lead to a substantial attenuation of signal strength
7.2.
HDD CAPACITY CALCULATION
7.2.1.
REFERENCE OF HDD CAPACITY CALCULATION
The first time install DVR, please check if the HDD has installed.
The capacity of the HDD
There is no limitation of capacity of single HDD to DVR, please choose the HDD according to the Vedios’
saving time.
The choose of the Capacity
Computational formula of HDD Capacity:
Whole HDD Capacity = number of the channels × time in need (hour) × spent of HDD Capacity per hour
(MB/hour)
Similarly we can have the formula of recording time:
annel
AmountofCh
hr
rHour
cupationpe
CapacityOc
pacity
TotalHDDCa
hour
time
R
×
=
）
（
）
（
）
（
MB/
MB
ecording
Note: 1GB=1000MB, not 1GiB=1024MiB, so HDD capacity shown in Base Configuration under
HDD Management less than real marked.
File size per hour (CBR).
Bit Rate
File
Bit Rate
File
Bit Rate
File
96k
42M
320k
140M
896k
393M
128k
56M
384k
168M
1.00M
450M
160k
70M
448k
196M
1.25M
562M
192k
84M
512k
225M
1.50M
675M
224k
98M
640k
281M
1.75M
787M
256k
112M
768k
337M
2.00M
900M
FORM 7‐1 RECORD FILE SIZE
