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No. 1/2024 (January 1, 2024)
Japanese engineers break data transmission record. They transmitted all Internet traffic in 1/20th of a second!
Japanese engineers have broken the record for data transmission using a single fiber optic cable, exceeding the speed of 22.9 Pbit/s (Petabits/second). This is more than double the previous record of 10.66 Pbit/s and more than 20 times the total amount of data sent over the entire world's Internet network in a second. The data traffic that was taken into account includes all kinds of online activities, such as web browsing, video streaming, file downloads, online gaming and any other data exchange between devices connected to the Internet around the world. While most users around the world surf the Internet at a maximum of a few hundred megabits per second, this breakthrough speed achieved by Japan's National Institute of Information and Communication Technology (NICT) leaves even the fastest consumer connections behind.
To handle the higher network traffic, NICT researchers used a technique called multiplexing, which is the realization of two or more communication channels in a single transmission medium. The multi-level multiplexing also involved a larger number of cores in the fiber. The researchers found that each core in a fiber optic cable can transmit data at a speed of 0.3 to 0.7 Pbit/s. When added together, the total transmission speed was 22.9 Pbit/s. The researchers used a cable with 38 cores, each of which can transmit data in three modes, adding up to 114 spatial channels. This arrangement increases the total transmission capacity, using independent data channels in different wavelength ranges. Each mod is embedded in its own spatial channel, comprising 750 channels in the S, C and L bands with a bandwidth of 18.8 THz. NICT experts suggest that with further optimization of error correction, the system could potentially reach speeds of 24.7 Pbit/s, more than 1,000 times faster than current fiber-optic communication systems.
RACK cabinet in a multi-family building – termination of cabling for TV, LAN and fiber optic systems.
In the following photos, we present an example of the implementation of the termination of wiring in a multifamily building with 102 apartments. According to the current regulations, the cabinet located in the technical room is to be the point of convergence of cables from all apartments. To each apartment should be brought: 2 coaxial cables, 2 twisted-pair computer cables and 1 2-fiber fiber optic cable. |  |
SIGNAL RACK Cabinet R912016 used to terminate cabling in a multi-family building. The Terra multiswitch system is installed in the back of the cabinet.
When selecting a RACK cabinet for such a scenario, of course, the number of panels that will be the proper termination of cables should be foreseen. However, this is not all. In addition to the height of the cabinet itself, it is worth thinking about:
- an adequate amount of space for mounting active devices; in the case of a typical multi-family building, this will be the set of amplifiers and multiswitches shown in the picture, performing RF/SAT signal distribution. Adequate width and depth of the cabinet will allow to mount the above devices on the side or rear. This saves valuable space on the front.
- vertical cable organizers - since the number of cables that enter the cabinet is large, the number of cables that cross the operator's devices (LAN switch, optical splitter, etc.) with termination panels will also be large. Therefore, choosing a cabinet model equipped with vertical cable organizers seems to be the only right one. Without this element, sooner or later, there will be a huge mess on the front of the cabinet.
- the possibility of convenient and safe introduction of cables from external operators - vertical cable organizers can also be used by external operators to safely and as conveniently as possible introduce their own cabling into the cabinet. Here we are talking about multipatchcords, cables feeding optical splitters, etc. If this issue is not carefully considered, and operators are left with a free hand in this regard, they will end up with a mess, which in turn will affect the possibility of failures.
The cabinet used in the above example and meeting the requirements described above is the SIGNAL RIGNAL R912016 19" 42U 800x1000 mm standing RACK cabinet.
AS07STCA-4K – professional measurement of RTV/SAT signals.
In addition to the measurement of individual parameters of digital TV signals, which have a significant impact on the correct implementation and operation of RF/SAT systems, one of the main criteria in selecting a meter will be its ease of use and functionality. Certainly, a much more convenient device will be a meter that has one input common for DVB-T2 and DVB-S/S2 signals. This solution eliminates the cumbersome switching or rearranging of the measurement cable when measuring directly from the multiswitch. Another important feature is the measurement of RF signals over a very wide range, which eliminates the problem of signal overdriving on individual elements in the system as well as the meter itself.
The AS07STCA-4K R10206 meter allows to measure RF signal power expressed in dBμV in the range of 25...100 dBμV. Screenshot illustrating DVB-S/S2 signal measurement simultaneously from two satellite positions for each polarization/band pair. This functionality is particularly useful in multiswitch systems.
Messaging users of Hikvision IP video intercom system from iVMS-4200 application.
The iVMS-4200 application allows you to send messages to selected tenants. It is particularly useful in more complex systems, as it allows you to quickly convey important information to all users such as notification about breakdowns, maintenance activities or management-related issues. Messages can be sent after configuring the system, creating an organization, adding authorized users and assigning them to individual indoor station (completing the resident information). To do this, after starting the iVMS-4200 application, go to the tab:- Access "Control->Video Intercom->Notice", select "Add " and in the "Send to tab select the subscribers
After the available options are completed (message subject, type, photo, content) and confirming with the Send button, the message will be displayed on the monitors of the indicated subscribers.
Snapshot of the window for sending messages
to selected subscribers of the IP video intercom system using the iVMS-4200 (v3) application
to selected subscribers of the IP video intercom system using the iVMS-4200 (v3) application
Basics of IP addressing – part 7 – DDNS.
To run a server, e.g. with a www or for viewing CCTV cameras, to be available from anywhere on the Internet, and if you do not have a fixed IP address, but you only receive it dynamically from a DHCP server, you have to use the DDNS (Dynamic Domain Name System), i.e. the dynamic name server service.Subscribers connected to the Internet often do not have a fixed public IP, but it changes from time to time. In this case, the user unable to directly connect remotely to such a location. Here, the DDNS service comes to the rescue, which, like the DNS, has a database of entries of the domain and numeric address relationships, but it can be updated at any time by the domain owner (a dedicated service/application installed on user hardware notifies the DDNS server of the address change). Thanks to that, the server can be reached under one fixed name, regardless of what IP address it currently has. For that reason, you can communicate with the server only using the domain address translated by the DDNS server (unless the current numeric server address is known, but you never know how long it will be valid).
Here is a diagram of a one-cycle communication between the client and server without a fixed IP
address via DDNS. It will be repeated the next time the address is changed.
address via DDNS. It will be repeated the next time the address is changed.
| 1. Your IP is 83.17.30.134 2. IP changed to: dipol.no-ip.org so now 83.17.30.134 3. What is the current IP address for dipol.no-ip.org? 4. dipol.no-ip.org is now 83.17.30.134 5. Hello, 83.17.30.134, send me your website 6. Here is my website | |
Note that it may take a short while, after the DHCP server changes the IP address, before the program or router detects that, and then it may take about a minute for the update information to be sent to the DNS server. You have to bear in mind that the server may be unavailable for some time when the IP address changes.
 | Single-mode SC/APC simplex adapter without flange L4224 designed for connecting single-mode optical fibers and cables terminated with SC/APC connectors. The flangeless housing allows the adapters to be used in products that have limited space for mounting this type of components. | |
 | LINEO pul bracket for 2.5-3.5 mm subscriber cable E857523 is designed for the implementation of overhead lines based on cables with a diameter of up to 3.5 mm. Due to its special features, the holder will perform very well on sections of overhead lines between the pole and the user's building. | |
 | NEXT surface-mounted indoor FTTH 2HP L5303 subscriber outlet designed for wall mounting. Used in FTTH networks for terminating subscriber lines. NEXT outlet has space to mount optionally up to 2 adapters in SC simplex standard (in version without flange) and dedicated fields for max. 4 splice covers. The outlet is protected against accidental opening. The special feature of the outlet is its modern design and small depth of 2 cm. | |
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