FM spam: soon the posters will “grow wiser” and start broadcasting the FM signal, scoring our favorite radio station

FM spam: soon the posters will “grow wiser” and start broadcasting the FM signal, scoring our favorite radio stationLast 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 ...
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Announced Wi-Fi 6: what you need to know it is the new standard

 
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.  
Announced Wi-Fi 6: what you need to know it is the new standard 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]
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Losses in mismatched line

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)...
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Soon half of the calls will be from robots. Advice: do not answer (?)

Soon half of the calls will be from robots. Advice: do not answer (?) 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; ...
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MNaaS and eSIM - the pros and cons of virtualization for mobile operators and their customers

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.
 
 
MNaaS and eSIM - the pros and cons of virtualization for mobile operators and their customers

 
/ PxHere /PD
 
 

Mobile network as a service


 
The technology "mobile network as a service" (MNaaS ...[/h]
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Optical transceiver FTDI-POF

Optical transceiver FTDI-POF
 
 
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)...
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Integration of 3CX with 1C: Trade Management

Integration of 3CX with 1C: Trade ManagementBy 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 ...
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Made in space: who will make fiber on the ISS

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.
 
 
Made in space: who will make fiber on the ISS

 
/Wikimedia ...
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Overview of SIP-phones Digium A20 and A25

Overview of SIP-phones Digium A20 and A25
 
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 ...
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Velosipedy and conversation of cloud telephones with each other

Velosipedy and conversation of cloud telephones with each other
 
If the telecom operator respects itself, then it supports the SIP and the point. The process "subscriber A calls subscriber B" is easier to implement if the telephony /asterisk /freeswitch communicate in a uniform manner, according to the standard. For the sake of completeness, let's remember about the "iron" phones, which - a surprise - have not yet sunk into oblivion, because they are using the enterprise. However, working with this protocol is not the simplest thing that is in telephony. Today I'll tell you how our platform implements SIP and what nuances developers are waiting for; even if you are ...
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