Media conversion connects surveillance networks utilizing copper-based cabling.
by Curt Carlson
Media converters designed specifically for analog video networks can be used in the integration of fiber-optic cabling, allowing physical security and surveillance networks to experience the benefits of extended transmission distances, and protection from noise and interference.
Whether the cabling is coax for traditional analog cameras or unshielded twisted pair (UTP) for newer IP-based cameras, copper cabling poses several issues that could limit the design or physical reach of a video security network. Integrating fiber-optic cabling into these networks can address many of these issues.
Whether organizations are monitoring employees, identifying corporate visitors, tracking hazardous work areas or guarding against intruders, theft and vandalism, most organizations see the benefits of an effective video security system. As these networks grow, transmission distance issues can arise, causing the need for additional equipment.
Analog-based systems transmitting video signals over coax cabling have provided good performance and acceptable images at distances up to 750 feet. Beyond that distance, equipment such as signal conditioning and/or signal amplification and surge protection devices are needed to prevent the loss of high-frequency information.
As security professionals have migrated to the newer IP-based technology, they have had to face more challenges. Even though IP-based systems are growing in popularity, their transmissions are limited to distances shorter than their analog equivalents.
IP-based security networks work within the standards of an Ethernet network, meaning the maximum transmission distance on UTP cable is limited to 100 meters or 328 feet. At that point, the signal must be regenerated and retimed with a network device such as an Ethernet switch. Requirements for these additional devices in either an analog or an IP-based network may increase the cost of the system considerably.
In addition to the limited transmission distance, both coaxial and UTP cables are susceptible to noise or electrical interference caused by high voltages and ground loop faults, both of which can lead to quality degradation of the video signal. Also, the security of the video network as a whole can be jeopardized by the ease of tapping into the copper cable and stealing or copying the video stream. These issues have led security professionals to look for alternative cabling methods. Read the rest of this entry »
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