EPHD04+ HDcctv DVR
Chapter
2
2.Installation
2.1Coaxial Cable Preparation
EverFocus HDcctv technology is mostly based on the SMPTE-292M standard, which defines HD- SDI (High Definition – Serial Digital Interface) video transmission. The HDcctv technology requires higher frequency than traditional CCTV technology. The table below listed the supported coaxial cable types for EverFocus’ HDcctv 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 | | Max. Cable Distance |
per 100 m / 328 ft | |
| | | |
RG-59 | 24 ~ 40 dB | | 70 ~ 160 m / 230 ~ 520 ft |
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RG-6 | 15 ~ 35 dB | | 100 | ~ 190 m / 330 ~ 620 ft |
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RG-11, | 8 ~ 16 dB | | 180 | ~ <250 m / 590 ~ <820 ft |
CATV-Lowloss Cables | |
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Note: Low quality cable may produce higher attenuation. | |
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The standard RG-59 cables are originally designed for lower frequencies. However, with EverFocus’ HDcctv 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.
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