1. Coaxial Cable

75 Ω coax (e.g., RG-59, RG-6, or equivalents) historically dominated analog CCTV. Standard labeling might be “RK75-4/11” in some regions, but in the USA, you commonly see RG-59/U, RG-6/U, RG-11/U notations.

• Good for short to moderate runs (up to a few hundred feet) in analog systems (CVBS).
• For newer HD-over-coax systems (AHD, TVI, CVI), RG-59 or RG-6 with solid copper core and 95%+ copper braid is recommended for extended distances.

Connectors: BNC is standard for security coax. Proper crimping or compression with the correct stripper/crimper ensures minimal reflections and reliable shielding. A 10× cable diameter minimum bend radius is typical to avoid internal conductor damage.

2. Twisted-Pair (e.g., Cat 5e/Cat 6)

UTP or STP with 100–120 Ω characteristic impedance. Popular for:

• IP Cameras (Ethernet).
• HD Analog using baluns that convert 75 Ω unbalanced signals to balanced twisted pair.

Recommended categories and frequencies:

Shielding can vary (UTP, F/UTP, STP, S/FTP, etc.). For high data rates (e.g., gigabit or 10-gig), or electrically noisy environments, shielded cable or fiber may be necessary.

Baluns and Video Over UTP

To carry an analog CVBS or HD analog signal over twisted pair, you typically need baluns (symmetry transformers) or active extenders. One example is a passive unit like TTP111VE. When running near AC mains cables, maintain the recommended separation (e.g., 4–12 inches or more, per local codes and TIA-568 guidelines) to reduce interference.

RJ-45 Termination:

• Pin assignment (TIA/EIA-568B):
• White-Orange
• Orange
• White-Green
• Blue
• White-Blue
• Green
• White-Brown
• Brown
• Straight-through vs. Crossover: Modern switches and NICs often auto-MDI/MDIX, so crossover cables are less common.

3. Telephone-Style Twisted Pairs (TPP, etc.)

In some regions, older telephone cables (e.g., TPPэп in the source) can carry analog CCTV signals up to ~2 km (1.2 mi) with active or passive extenders (like AПВС-11). For HD analog (AHD, TVI, CVI), specialized modules (e.g., AПВС-5 AHD) are required to maintain signal integrity.

This is less common in modern U.S. infrastructure but may appear in retrofits or large campuses with existing multi-pair telephone cables.

CONCLUSION

Designing a robust CCTV or IP camera system in the United States demands careful attention to:

• Required resolution for each operational goal: monitoring, detection, recognition, identification, or license plate capture.
• Proper lens focusing (infinity, hyperfocal, or direct target focus) and aperture management (P-iris or manual) for consistent sharpness.
• Power planning, whether local adapters, centralized 12 V or 24 V DC distribution, or PoE. Account for cable voltage drops and margin.
• Transmission media, ensuring correct coax, twisted pair, fiber, or wireless solutions with appropriate connectors and minimal reflection/interference.
• Compliance with local electrical codes (NEC), building codes, and best practices for cable separation, grounding, and surge protection.

For more advanced design, visual simulation software or an experienced integrator like safsale.com can significantly streamline the process, ensuring you pick the ideal camera type, resolution, lens, and cabling that match the project’s security requirements.