Korean researchers at the Electronics and Telecommunications Research Institute (ETRI) have developed a wireless underground communication system that operates at distances of up to 100 metres. Unlike traditional radio wave-based technologies, it uses magnetic induction, thus avoiding the problems associated with signal penetration through the ground. This opens up a new channel of communication that can help, among other things, in checking whether people trapped underground are alive after th...

DVB-T2 television antennas of the COMBO type with H/V polarisation are used to receive signals in the VHF and UHF bands, allowing reception of all DVB-T2 terrestrial TV multiplexes. The selection of a suitable DVB-T2 TV antenna depends on many factors, so there is no single universal solution for all users. Of key importance is first of all the distance from the transmitter and the signal strength in a given location. In locations close to the transmitter (up to 40 km for a strong DVB-T2 transm...

Hikvision IP DVRs of the NXI-K and NXI-I series feature face capture and analysis on a specified number of channels. It is possible to create libraries of faces that will later be used to search the recordings. It is also possible to specify the associated actions that will be carried out in the event of a correct or incorrect...

When studying fiber optic network design documentation, one will come across many designations for fiber optic cables and fibers. There are several popular styles of fiber naming. Some of them come directly from the designations proposed by standards and recommendations. Others are a confusion of these designations with abbreviated descriptions on the outer sheaths of cables....

AcuSeek is an advanced feature available on Hikvision's latest IP DVRs that introduces a completely new way of searching through video recordings. It uses multimodal artificial intelligence capable of simultaneously analysing camera images and natural user text queries. As a result, the system is able to understand the content of the footage and the intentions of the person using the search engine, making it possible to find a specific video moment in seconds, without having to manually review ...

In the previous Newsletter, the subnet mask was discussed. More often than not, the third will detail how to calculate the network address and host (IPv4) based on the netmask. The function of the mask is to determine how many consecutive bits in the IP address constitute the network address. The remaining bits already determine the address of a specific host on that network (the address of the end device). Where the bit in the mask ...