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No. 11/2019 (March 18, 2019)
New modulation will improve the data transmission speed in long-range optical cables.
A team of scientists from the American company Infinera conducted an experimental data transfer via the transatlantic fiber optic cable Marea. Originally, the designers of the transatlantic link assumed that the cable could transmit data at rates up to 20 TBps per fiber pair. The researchers have proven that it is possible to send data faster. After applying their own modulation variant, 16 QAM, they achieved a record data transfer rate of 26.2 TBps This speed is already close to the maximum theoretical value for the optical fiber, resulting from the Shannon limit. The use of the new method requires the installation of special superfast light modulators, but the rest of the installation does not change. Such modernization is therefore not very expensive.
The structure of the undersea fiber optic cable Marea: 1–polyethylene jacket, 2–PET foil, 3–steel plait, 4–aluminum layer, 5–polycarbonate, 6–copper tube, 7–hydrophobic gel, 8–optical fibers (8 pairs)
The Marea fiber optic cable has been laid at the bottom of the Atlantic Ocean at the request of Facebook and Microsoft by Telxius telecommunications company. The purpose is to provide a reliable connection between Europe and the USA. The service was launched in 2018 and so far it provides the fastest transatlantic connection. The cable is composed of eight pairs of optical fibers, which altogether allow for data transfer rate up to 160 TBps. Thanks to the latest Infiniera achievement, the data transfer rate can be exceeded up to 200 TBps.
According to TeleGeography, there are 378 telecommunications cables connecting different continents on the seabed. Their bandwidth is too small in relation to constantly growing needs, especially due to the increased popularity of all types of cloud and video streaming services. The construction of new connections and the increase of capacity of the existing solutions improves the comfort of using various network services.
Satellite and terrestrial TV signals over single coax.
To use two satellite receivers or the function of simultaneous recording and watching two different channels provided by a PVR (Personal Video Recorder), it is necessary to have two independent SAT signals. Individual satellite installations with a SINGLE type LNB installed several or more years ago cannot provide such a functionality.The adaptation of an older SAT TV installation for the use of two receivers or a PVR requires the change of the SINGLE-type LNB for a TWIN LNB. The additional output of the TWIN LNB has to be connected to the second receiver or the second input of the PVR via another coaxial cable.
It happens that the installation of the second cable could be very troublesome. In this case, a good alternative is the application of the R85261 Johansson multi-band converter kit. The kit combines two independent satellite signals and terrestrial FM/DAB/TV broadcasts into one coaxial cable. It is an ideal solution for everyone who wants to replace their simple SAT receiver with a PVR (with two IF inputs), or use another, independent DVB-S/S2 receiver, without a need of installing another coaxial cable.
An application diagram of the multi-band converter KIT Johansson R85261.
Transmission of two independent DVB-S/S2 signals (from one satellite)
and DVB-T broadcasts via one coaxial cable (red).
Transmission of two independent DVB-S/S2 signals (from one satellite)
and DVB-T broadcasts via one coaxial cable (red).
Applications for the configuration of Hikvision IP video door phones.
Hikvision IP video door phones/intercoms can be configured with the use of the iVMS-4200 or Batch Configuration application. Before starting the configuration, the devices have to be activated by giving them a password and setting IP addresses. Then, the used should add the devices to one of the applications and go to remote settings. The iVMS-4200 client application also allows for operation of the video door system, including remote preview of the video from the gate/door station, remote opening, sending messages etc. The Batch Configuration is a lightweight and simple app for quick activating, configuring, updating, or resetting the devices.
Configuring the DS-KV8402-IM G73635 gate/door station with the use of iVMS-4200
Media converters – the best IP network surge protection.
Network equipment responsible for the transmission of data in companies is usually a major investment. Financial aspects also include any losses that could be caused by the failure of the ICT systems during everyday operations. Special efforts are required to minimize the risk of damage to the servers.
Two ULTIMODE media converters connected by a short patch cord make a simple, efficient and reliable method of securing the network and computer equipment against any voltage surges.
Optical fiber is an electrical insulator. It provides excellent electrical isolation between devices, while allowing high data transfers. In order to fully protect network and computer equipment from external voltage surges, many users apply two media converters connected via a patch cord, just before the server cabinet.
For this application, the best choice is to use Gigabit Ethernet media converters cooperating with two multimode fibers (duplex), which are cheap and eliminate the need of optical attenuators at the extremely short distance, such as M-023G L10025.
Powerful PoE switch.
The TP-Link TL-SL1218MP N29960 PoE switch has 16 PoE 10/100 Mbps ports compliant with 802.3af/at standards. The total power budget of the ports is 192 W, which allows for providing power to multiple access points and/or IP cameras. Thanks to two RJ45 10/100/1000 Mbps ports and two gigabit combo SFP slots the device enables high data throughput. The range of the data/PoE connections can be extended up to 250 m.Distinguishing features:
- 16x PoE+ – ports compliant with 802.3at/af
- Total PoE budget of 192 W
- Maximum load of a PoE port: 30 W
- Two 10/100/1000 Mbps ports,
- Two 1 Gbps SFP slots (combo)
- Extended mode (transmission of data and power up to 250 m)
PoE Switch TP-Link TL-SL1218MP (16xPoE 802.3af/at, 192W, 2xGE, 2xSFP COMBO) N29960
How to protect devices against the effects of overvoltages in large CCTV systems?
In installations with long outdoor sections of copper cables, the greatest hazards are surges/overvoltages arising from atmospheric discharges. They usually occur in the video signal lines (twisted pair or coaxial cables). The CCTV systems can be protected by using specially designed surge protectors.Advantages of using surge protectors:
- increased resistance of devices to damages,
- continuity of recordings and stability of the system,
- protection of the footage collected from cameras,
- protection of peripheral devices,
- mark of a professional approach.
Ewimar surge protecting devices are manufactures in two versions:
PROFESSIONAL – providing increased protective effectiveness by directing large electrical charges to the ground. Built-in two steps with decoupling by high load resistors allow to eliminate the effects of ESD and surge voltages on the inputs/outputs of CCTV devices. The PRO series provides the basic protection for devices installed outdoors and for the connected equipment.
EXTREME – ensuring the latest protection means in the form of superfast automatic fuses with auto-reset feature, made in MOSFET technology. The devices of the EXT series have built-in three segments of surge protection operating in the right order during lightning or other incidents of surges and voltage spikes of various levels. Secondary overvoltages are eliminated by a separate circuit decoupled by a unique solution with ultra-fast MOSFET fuse (1 µs) and transient voltage suppressor. After suppressing overvoltages by protective elements, the signal connection is immediately restored.
 | Surge Protection Box Signal ZMZ-13 R48615 has been designed for comprehensive protection of SMATV systems based on multiswitches. The device protects all the satellite and terrestrial TV paths (13) against voltage surges induced in signal lines by lightning strokes. Intended for mounting on a mast/pole, with the R90610D pole mount. | |
 | Wireless Dual-band Gigabit Router: TP-Link Archer C6 AC1200 N3255 allows users to create highly efficient wired and wireless networks. Thanks to high performance and security of the 802.11ac and 80211n standards, the users can create fast and reliable home and SOHO/SME networks supporting multiple devices at the same time. The high performance is provided by MIMO technology guarantying smooth transmission of HD video, VoIP communication, online gaming. On the rear of the stylish device there is WPS/Wi-Fi button that activates Wi-Fi Protected Setup (WPS). It allows the users to activate WPA2 encryption mechanism to protect the network against external threats. | |
 | Router RouterBoard RB3011UIAS-RMN243011runs RouterOS Level 5 system. This 10-port Gigabit Ethernet router is equipped with 2x 1.4 GHz processor and 1 GB RAM. The components and system ensure exceptional performance compared to SOHO devices that usually are equipped with RAM up to 16 MB. The hardware and MikroTik system based on Linux are designed to create advanced professional networks based on static or dynamic routing. With advanced firewall features and queuing, it is easy to manage Internet bandwidth. | |
Worth reading
How to connect a microphone to video monitoring devices? In most CCTV systems it is possible to record video and sound. In an HD-TVI system, the audio module is to be connected to the "AUDIO IN" input of the DVR. In an IP CCTV system, it is connected to the required camera. The diagram below shows the connection between a Hikvision IP camera and the DS-2FP2020 M1918 audio module... >>>more
Connection of the M1918 microphone module with an IP camera
Signal MRP multiswitches – favorable prices, 3-year warranty
