Closed Circuit Television (CCTV)

Closed Circuit Television (CCTV)

 CCTV is the current technology which is used for security surveillance. It captures images using lenses in one end, converts it into motion images and transmits it through a certain transmission medium to the receiving unit in one end. The motion picture will then finally be displayed on a monitor or a laptop screen.

The main elements of a CCTV System

CCTV system has four basic parts which are very important for its operation.

1. Video Source (Camera)

This component is the primary source of images in the CCTV system. It has lenses which capture images by focusing light onto Charge Coupled Device which records light electronically. The video source is also tasked with monitoring the images at the place of interest. It is generally where the system starts its functions for monitoring.

2. Transmission medium

The CCTV’s transmission medium is responsible for transmitting images from source to the end (destination unit).Coaxial cable is commonly the preferred cable in this case.

3. Recording unit (DVR)

DVR is a storage component which houses the recorded footage for later viewing. It also receives the images and sends them to the display unit for live monitoring.

4. Power Source

The power source is a mandatory component of an electronic device. The CCTV needs power sources in the recording unit and the camera. These two components cannot operate without the power source. In CCTV, power is normally tapped from a 12V AC/DC adapter.

Concerns for CCTV deployments

The deployment of CCTV comes with some worries. Some of these concerns include:

Privacy: The installation of CCTV in organizations’ offices means that the privacy of employees is in limbo. The top management can watch what they are doing at will.

Leakage of organizations’ secrets: CCTV camera installations, especially in organizations which are always audited, can expose the organization to the threat of losing secrets to auditors.

Whether CCTV cameras can deter criminals: In some parts of the world criminals find pleasure in getting identified by the CCTV cameras especially in recent cases of terrorisms.

Rapid trends of CCTV cameras: The trend is changing so fast that institutions are always concerned with the current technologies entering the market for better surveillance.

References.

1. An ASSA ABLOY Group Brand (2014). Training Guide Introduction to CCTV. Yale Press
2. Kevin, L., DOC, M., Eric, P, Pelco, M. T., URS E. (2011).Advanced CCTV and what it means to your operation. Journal presented at EFC Conference (May 2011) Leavenworth, WA

Question Two.

Define the full, incremental, and differential backups and describe the differences between these data backup types?

Full Backup

The full backup is a way the name suggests. It refers to producing a copy of the entire dataset.

Incremental backup

This type of backup keeps the dataset which has changed since the last backup only.

Differential Backup

Differential backup takes the features of both full and incremental backup. It starts with taking the full backup then proceeds for incremental backups for data sets which have changed since the last time of taking the full backup.

Comparative differences of data backups

References

1. Brien, P. (2010) Data backup types explained: Full, incremental, differential and incremental-forever backup. brienposey.com.
2. Sumner, G. S., Ammons, J. M., & Liddell, M. (2011). S. Patent No. 8,041,677. Washington, DC: U.S. Patent and Trademark Office.