Last year, a very interesting presentation was presented at the conference “USENIX Symposium on Networked Systems Design and Implementation”. How to turn a T-shirt or billboard into an FM radio station. The presentation author explains how to “fit” digital data and arbitrary audio tracks onto an FM signal already flying over the air. Through the effect of backscattering radio waves. The presentation seemed so interesting to me that I could not refrain from preparing a brief retelling.
 
What is the practical value of such "FM-jerking"? Are they generally real, or is it from science fiction? And ...

 
3r3-31. In early October, the Wi-Fi Alliance announced a new version of the standard Wi-Fi - Wi-Fi 6. Its release is scheduled for the end of 2019. The developers changed the naming approach - they replaced the usual ???ax-type constructions with single digits. We understand what else is new. 3r3179.  
3r3179.  
3r3190. 3r3179.  
3r3119. 3r3152. /Wikimedia / yonolatengo / CC 3r3194.
3r3179.  
3r3179.  

Why change the name

3r3179.  
By According to 3r3190. developers of the standard, the new approach ...[/h]

In the literature described approximate formulas for calculating additional heat losses in uncoordinated transmission lines (cables, waveguides) due to standing waves. The limitation of such formulas is that the own losses of the matched cable should be up to 2 dB. Today, high-loss cables are increasingly used for microwave frequencies above 1 GHz. Broadband antennas often have a CWS 1. To find a compromise between the length of the line (for example, the antenna's suspension height), its cost, to estimate losses in a deliberately mismatched line (for example, 75 Ohm cable in 50 Ohm systems)...

 3r-33199. 3r3-31. Today we have an unusual material - this is a translation of an article about illegal automatic dialing in the USA. For centuries, there have been people who used technology not for good, but to fraudulently cash in on gullible citizens. Modern telecommunications are no exception, spam or outright "divorces" can overtake us by SMS, by mail, by phone. With phones it has become even more fun, because today there are automatic calls (hereinafter - robozvonki). Invented as a legitimate and transparent way to inform people and make additional sales, they are very fond of scammers; ...

Virtualization technologies are coming to the network of mobile operators. We started appear Services such as Mobile Network as a Service (MNaaS) and acquire the popularity of electronic SIM. Let's talk about the potential benefits of these technologies for operators and customers and the complexities of their implementation.
 
 


 
/ PxHere /PD
 
 

Mobile network as a service

 
The technology "mobile network as a service" (MNaaS ...[/h]

 
 
Hi, Habr, I am a student in the specialty of lasers in info-communication systems and for the first time I worked with fiber. I was invited to participate in one project related to the transfer of data on optical fiber and I took interest in this work with interest.
 
 
Fiber is becoming stronger in our life. This is the Internet, the connection of a variety of sensors, laser devices. It is also used in the lighting of rooms.
 
 
Optical lines have a number of advantages: there are no problems with grounding, high noise immunity, secrecy (there is no electromagnetic radiation that can be overheard)...

By the numerous requests of partners and customers, we have released server integration 3CX v15.5 with the popular 1C: Enterprise system.
 
 
Integration is an extension of the typical configuration "Trade Management, edition 11 (???.167) for Russia" ( .cfe file ), Which is installed in the configuration in the standard way (see below). On the side of the 3CX server, a CRM template is loaded to interact with the web service of the published 1C configuration.
 
 
1C Configuration Extension: Trade Management implements the REST API, which maps incoming call numbers to counterparty numbers in ...

In July, the ISS brought The prototype of the device, with the help of which will make fluoride optical fiber ZBLAN . It exceeds the usual "optics" by the transmission coefficient is in the infrared range and other optical parameters.
 
 
If everything goes well, the first "space mini-factory" for the production of optical fiber will appear in orbit. Under the cut - details about features and development prospects.
 
 


 
/Wikimedia ...

 
In February 201? Digium, the developer of the open-source project Asterisk, introduced A series phones designed to work specifically with Asterisk. Even strange that for so many years Digium has refrained from producing under its brand of conventional SIP-phones. And in August 201? Digium announced a merger with Sangoma, a leading manufacturer of equipment for Asterisk. Coincidence? Hardly, of course.
 
The line of phones of a series And has turned out, in my opinion, quite competitive, with the fishechkami. The series for the current moment includes four models - A2? A2? A2? A30. Let's take a closer look ...