Researchers at the University of Bristol have developed an innovative laser system inspired by quantum physics that enables distance measurements with sub-millimetre accuracy, even in strong sunlight. Until now, one of the biggest challenges in long-range optical measurement has been so-called 'noise', i.e. interference from sunlight and changing weather conditions. Researchers at the University of Bristol have shown that effects known from quantum sensors can be reproduced in a classical laser...

The WDM (Wavelength Division Multiplexing) technique allows signals of different wavelengths of light to be transmitted simultaneously over the same optical medium, which significantly increases the capacity of RTV-SAT installations. In practice, this means that satellite, DVB-T2 terrestrial TV and radio signals can be transmitted over a single fibre-optic cable and then distributed to end users via traditional copper lines....

The installation of IP video door entry and access control systems using existing cabling previously made by another company, often involves the problem of its inadequacy to meet current requirements or an insufficient number of cables supplied to the devices. A typical example is a single twisted-pair cable led to an IP door station or access control point, such as a terminal. IP video door stations almost always support PoE power and may have a direct or additional voltage output to power the...

DDM, or Digital Diagnostics Monitoring, is a set of functions that allows the monitoring of the operation of fibre SFP modules in network switches. When a DDM-enabled insert is inserted into a switch, it gains access to the following insert performance parameters:

In the previous Guide we discussed the IP address. Another important parameter is the subnet mask. The subnet mask (for IPv4), like the IP address in version 4, is a 32-bit number (for IPv6 it is 128 bits). The mask is used to separate in an IP address the part that is the address of a subnet and the part that is the address of a host in that subnet. The subnet mask has a very distinctive structure - it starts with a sequence of ones...