DIPOL Weekly Review - TV and SAT TV, CCTV, WLAN

Will something stop the development of FTTH?

The International Telecommunications Union (ITU) has started procedures for standardizing G.fast, the next DSL-based broadband technology. G.fast promises data rates up to 1 Gbps over existing copper telephone wires..

The conventional wisdom says that copper systems have reached their maximum capacity in terms of bandwidth, and the only way for the further development of subscriber networks are fiber optic installations. But not all service providers and installers want to directly supply fiber to the end users as it is still difficult to lay fibers to the subscribers' homes. So, despite many advantages over conventional systems, the trouble and cost associated with installation and operation of fiber optic systems in houses and apartments is the reason for looking for more cost-effective methods of deploying FTTH-speeds to the subscribers' homes. G.fast can significantly postpone the final triumph of glass over copper.

ITU has already begun the work on G.fast in February 2011. At present, it has issued ITU-T G.9700 recommendation aimed at protecting the frequency band now occupied by the FM radio. It turns out that for achieving the target throughput, even at short distances, G.Fast needs a 100 MHz frequency spectrum, interfering with the FM band. ITU continues intensive work to solve this problem. A natural solution would be the transition from analog radio to DAB digital radio broadcast in higher band.

ITU Rapporteur for Study Group 15 Frank van der Putten said: "Our intention, our goal is to approve the first version of G.fast, a 100 MHz wide profile, early next year." This will pave the way for the first tests and development of the hardware by the manufacturers. This would allow for a real launch of this technology in 2015. Then we can see whether G.fast is a real threat to the FTTH technology, or just the last gasp for DSL networks.

Optical fiber in the home.

Deployment of optical fibers in houses and apartments is connected with esthetic and safety issues. The connectors on the fiber should be adequately protected and directed so that it was practically impossible to look into them. Standard installations in new buildings are based on flush mounting. New ULTIMODE fiber optic outlets (termination box and front plates) meet this requirement.

The ULTIMODE TB-05W termination box is complementary to TB-01W L53001 and TB-02W L53002 front plates. The front plates are designed to hold simplex or duplex adapter that is directed downwards (at an angle). This means that even unprotected adapter with a disconnected patchcord does not "aim" at the room's interior, but somewhere at the floor.

The plates are made of high quality plastic and blend well with the rest of home installations.

Modernization of antenna system in an apartment building.

One of Krakow's housing associations decided to modernize the shared antenna system for the reception of DVB-T and FM radio. The four-story building has four staicases, each floor has four apartments.

The total number of outlets in the building is 64, and, aside from the DVB-T and FM broadcasts, the installer should provide surveillance video from two security cameras, also in DVB-T standard.

Diagram of the antenna system in the multifamily building

The active components of the system include DVB-T modulator Terra mdx420 R82518, two twin channel amplifiers Terra at420 R82510 and multiband amplifier Terra ma400 R82520. The at420 R82510 selective amplifiers equalize levels of 4 digital multiplexes (there could be used four-channel amplifier Terra at440 R82511 instead). The mdx 420 R82518 DVB-T modulator is used to inject two video surveillance channels into the RF distribution system. The multiband amplifier ma400 R82520 with three independent paths (FM, VHF&DAB, UHF) allows for final amplification of the signals in the UHF band, as well as for the amplification and injection of radio signals broadcast in FM and VHF bands.

The signals are distributed in a passive network composed of RF splitters and taps. On each floor there is 4-output tap connected directly with Alcad R66200 subscriber outlets. The cabling is made of RG-6 PVC DIPOLNET coaxial cable E1230.

The installation ensures reliable access to digital signals for many years. In the case of new broadcasts in the area, the system can be easily extended by adding another channel amplifier.

Outdoor installation boxes.

Cable connections, power supplies, video/media converters for security cameras, TV amplifiers etc. often have to be installed outdoors. Aside from finding appropriate locations, the connections or devices have to be adequately protected against various environmental conditions.

It is the function of installation boxes to protect the devices and connections against dust and water ingress. When selecting a box for outdoor applications, the installer should pay attention to its IP rating, indicating the protection level against dust (the first digit) and water (the second digit). The best solutions with permanently placed seals ensure high protection levels (IP56 or IP66) even after multiple opening and closing operations. In the case of indoor use, the box should be made ​​of plastics without halogen compounds that, during fire, could produce toxic and corrosive gases.

The following table lists installation boxes made ​​of plastic and/or aluminum. Additional accessories include internal mounting plates (chassis), DIN rail, and cable fittings/glands protecting the cables from mechanical stresses and ensuring proper ingress protection levels.

Security cameras and DVR available online - everyone can check our devices in action!

To allow customers to monitor the actual operation of some offered devices, we made them available on the Internet - two Sunell IP cameras (2 MP - K1630 and 5 MP - K1637) and Hikvision DVR M72104 with connected analog camera M11194.

All three cameras monitor the same area, the busy street and parking lot in the front of our store. This configuration of the cameras allows customers to compare the image quality of the different camera models, which is connected with the number of details provided, such as license plate numbers, inscriptions on passing cars, facial features of people contained in the field of view. The image comparison allows for a better selection of cameras for different tasks required by the users.

Logging details:

http://62.181.163.148 - analog camera M11194 and Hikvision DVR M72104 - login:dipol password:dipol1
http://62.181.163.149 - Sunell 2MP camera K1630 - login:dipol password:dipol1
http://62.181.163.150 - Sunell 5MP camera K1637 - login:dipol password:dipol1

A video recording from 2 MP camera Sunell SN-IPC54/12DN K1630.
Please choose the best available resolution.
The recording quality is somewhat reduced by the compression used by YouTube.

Mobile Internet - how to select the antenna? Part 1 - LTE.

Wireless Internet access via cellular networks is an increasingly popular service. The growing popularity of this service among subscribers is the result of mobility, higher throughput and lower prices. The absolute highlight is LTE technology that enables the achievement of data rates similar to those in landline /cable or WiFi networks.

Selecting an external antenna, the user should know whether the modem supports MIMO technology (has two antenna connectors). Such modems require appropriate MIMO antennas to maintain the highest possible data rates. When the user wants to employ a standard antenna, it must be connected to the connector labeled "tx/rx."

LTE/GSM/3G Antenna TRANS-DATA KPZ LTE 6/8 MIMO
A741022

Splicing optical fibers with different diameters. Indoor distribution cables Ultimode IDC have fibers with buffer diameter of 900 μm. Outdoor DRAKA cables are composed of fibers with buffer diameter of 250 μm. The fibers of the both groups of cables can be successfully connected with the use of heat or Ultimode mechanical splices... more

Preparation of 900 μm and 250 μm fibers
for the application of ULTIMODE FAST-MS1 L5550 mechanical splice

Freely selected commercials in hotel TV systems. Many hotel owners would like to launch in their hotel TV systems "private" channels with a selected content (including commercials). The typical signal sources include PCs, DVDs/Blu-rays, and very popular media players capable of playing previously prepared presentations and videos. Currently, the preferred video format is Full HD. A device that allows for the distribution of the video as a DVB-T multiplex throughout a hotel TV system is HDMI-COFDM modulator Signal-751 R86751. The HDMI signal (up to Full HD 1080p) modulates RF signal (a set of carrier frequencies) in accordance with DVB-T standard (COFDM), which can be received by any HD television connected to the antenna system... more

Application of the Signal-751 R86751 multifunctional device -
distribution of Full HD signal as a DVB-T channel in hotel TV system
and an IP stream available in WI-Fi network

How to protect DVRs against unauthorized access? In many cases the surveillance staff should not have physical access to the DVRs. The DVRs are often located in places with higher security levels, such as server rooms. In such situations, it is necessary to provide the surveillance staff with the video and access to control functions necessary for their job... more

A video surveillance system with remote control of PTZ cameras.
The DVR has been protected from physical access.