Siamese Cables:
Siamese Cables are usually those that have certain power wires attached to them. While they are considered to be quite complicated to handle, it does, however, provide transmission of both data and power at the same time to security cameras. A combination of two cables, it is made up of RG59 and 18/2 cable, the former for video transmission quality and the latter for power purposes. In other words, since RG59 is a coaxial cable, it helps in running the video to the security camera, whereas 18/2 cable helps in the AC/DC power to the camera.
What are CCTV cable types?
Generally, CCTV cable systems come with a number of tools and components. To the layman, it’s rather too confusing. Therefore, it’s important to understand the basics such as what a CCTV is and why opting for the right cable matters.
CCTV or Closed-Circuit Television is defined as the use of video cameras to transmit signal to a particular place. CCTV is used for mostly surveillance purposes bearing crime preventing, safety, monitoring and crime solving in mind. For this purpose, CCTV usually requires cables that would enhance the quality of video signals. For wired surveillance, there are plenty of other options that help in the transmission of better video signals among other functions. Take a look at the functions of each cable and how they are important for CCTVs.
Construction | Material | Diameter(mm) |
Inner Conductor | BC/ CCS | 0.81/ 20AWG |
Dielectric | Foam/ Solid PE | 3.7 |
First Shield | AL Foil(White or Gold Color) | 18 |
Second Shield | CCA/ AL Braid | 60-95% |
Outer Jacket | PVC | 6.0; 9.0 |
Power Wire | CCA | 7*0.37 |
PE/ PVC Twisted or Parallel | 1.8 |
Electrical Characteristics
Impedance (Ω) | 75±3 |
Capacitance (pF/m) | 52±2 |
Velocity of Propagation(﹪) | 85.0 |
Return Loss 5-1000MHz(dB) | ≥22 |
Return Loss 1000-3000MHz(dB) | ≥20 |
Attenuation(@20℃)
Frequency (MHZ) | Min Attenuation (dB/100ft) | Max Attenuation (dB/100m) |
5 | 0.6 | 1.9 |
55 | 1.6 | 5.2 |
187 | 2.8 | 9.3 |
211 | 3.0 | 10.0 |
400 | 4.1 | 13.5 |
500 | 4.6 | 15.0 |
750 | 5.6 | 18.5 |
860 | 6.1 | 20.0 |
1000 | 6.6 | 21.5 |
1500 | 8.2 | 26.8 |
1800 | 8.8 | 28.9 |
2200 | 9.8 | 32.2 |
3000 | 11.5 | 37.6 |
If you have technical support from an engineer, please let us know the type of cables you need, the inner conductor, the braiding coverage, the jakcet material and color, the packing length and design, and the application. We will help you choose the most suitable cable.
If you are not sure about certain specifications of the electric cables, please let us know your inquiry and we are very happy to give you professional technical advice and support services. Our company offer specific cables and wires consulting, design, OEM and manufacturing based on the customer's requirements and application scenarios to help customers create more business opportunities.