U Universal DVR
9
2.
Installation
2.1
Coaxial Cable Preparation
EverFocus HD-SDI technology is mostly based on the SMPTE-292M standard, which defines
HD-SDI (High Definition – Serial Digital Interface) video transmission. The HD-SDI technology
requires higher frequency than traditional CCTV technology. The table below listed the
supported coaxial cable types for EverFocus’ HD-SDI DVR.
Coaxial Cable Requirement
Attenuation at 1 GHz: < 32 dB per 100 m (328 ft)
Return Loss attenuation: > 20 dB
Impedance: 75 Ω
Coaxial Cable Type
Attenuation in dB at 1 GHz
per 100 m / 328 ft
Max. Cable Distance
RG-59
24 ~ 40 dB
70 ~ 160 m / 230 ~ 520 ft
RG-6
15 ~ 35 dB
100 ~ 190 m / 330 ~ 620 ft
RG-11,
CATV-Lowloss Cables
8 ~ 16 dB
180 ~ <250 m / 590 ~ <820 ft
Note:
Low quality cable may produce higher attenuation.
The standard RG-59 cables are originally designed for lower frequencies. However, with
EverFocus’ HD-SDI technology, you can still use the standard RG-59 cable for distances over 100
m / 330 ft. The RG-59 cables with high quality and low loss allow distances up to 160 m / 520 ft.
The RG-6 or RG-11 cables are the best use for longer distance connection.
Chapter
2
