Internal Hard disks are available at Param Systems Ramnad, We have both Seagate and Wester Digital (WD) HDDs. We are also dealing with External HDD 1TB, Internal Surveillance HDD 1TB Toshiba. Please contact 07339101188 for more information.
Seagate Internal Hard disk,
Wester Digital Internal Hard Disk,
Seagate Expansion External Hard Disk,
Toshiba AV Suveilance Hard disks.
For price enquiry please call : Param Systems, 07339101188
Normally an analog system works on a star layout where each
camera has it’s own individual coax cable which runs back to the video
recorder. Power for the camera can be supplied locally at the camera or run
along with the coax cable.
HDCVI works in a similar way where each camera has it’s own coax
cable which connects to the recorder. This means it can often be easy to
upgrade an old analog system to high resolution HDCVI using the existing
cabling. This is great for multi-site installations or for budget conscious
There are unconventional practice of using CAT6 wiring with a converter for both BNC and DC connector, where out of 8 cores, two cores supply power to camera and two cores transmit the signals.
In comparison, a network
camera installation can be more complicated. Analog and HDCVI cameras have
their own cable solely for the camera signal whereas network cameras can share
the CAT5e (or CAT6) cable with other devices. This can give some flexibility with
small installations to use an existing office network, reducing the amount of
cables required. However, a larger installation will need dedicated cables to
be run to allow for sufficient bandwidth.
All three technologies, Analog, AHD and IP/Network Camera use cameras to record images onto a recording device. In an SD or analog system, this is a DVR (Digital Video Recorder) and in an IP system, it is an NVR (Network Video Recorder). AHD systems use a hybrid recorder. All these devices record, playback and store video footage (plus you can remotely view video).
In an analog or AHD CCTV system the signal is then converted to analog and sent to the DVR over copper wires (coax or UTP) where it is converted back to digital, compressed and recorded by the device. Conversion from digital to analog and then back to digital can create a loss in recorded image quality when comparing the output from the cameras image sensor to what is recorded on the DVR.
In an IP system, however, the camera itself compresses and encodes the digital signal and then sends it to the NVR via IP (Internet Protocol). The NVR then records or copies the actual video file from the camera. Because there is no conversion between digital and analog and back there is no loss in picture quality.
The storage capacity is concerned, different models of DVR,NVRs have different capacity and different number of SATA connections. Generally, we can use from 500GB to 6TB in each SATA connections. The duration of recording depends on the quality of the video in terms of resolutions and the capacity of the Hard Disk drive installed in that recording device.
The difference between Analog, HD Analog and IP surveillance systems?
Simple comparision :
♣ Analog – uses coax cable with BNC connectors, cable run length of up to 350 metres, with a maximum resolution of 0.4MP (720×576)
♣ Analog HD – uses coax cable with BNC connectors, cable run length of up to 300 (at 1080P) to 500 (at 720p) meters, with a maximum resolution of 5MP
♣ Network/IP – uses CAT5e or CAT6 cable with RJ-45 connections, cable run length of up to 100 metres, with a maximum resolution of 12MP (4K – 4000×3000)
What are the different technology available in CCTV?
- IP CCTV – Also referred to as Network Camera
- Analog CCTV also referred to SD (standard definition), traditional, conventional, digital or analogue CCTV
- HD Analog stands for High Definition Composite Video Interface and can sometimes be referred to as high definition analog CCTV
Which one is best for me?
There is no doubt that an IP CCTV system will give a much higher
resolution picture with better detail and functionality. Many
companies with existing analog systems are choosing to upgrade to IP and
the majority of our new installs are IP.
Analog HD systems work well if high definition recording would be advantegous but it is important to keep the cost of installation low. Or if you have an extensive existing analog system and would like to upgrade to high definition using the existing camera cables to keep costs down. Standard analog CCTV may be the best option in limited situations.