Fibre Integrated Reception System
The FibreIRS GTU converts optical power to RF power (FM,DAB,DTT and 4 satellite polarities). The FIbreIRS GTU has built in AGC which allows a wide dynamic range of optical powers without affecting output power and quality. Two LED indicators allow the user to observe the status of the unit.
Two versions available — Quad for use directly with a receiver/faceplate. Quatro for use with a multiswitch as it has dedicated outputs for each of the satellite polarities and terrestrial. Both versions can be powered via the satellite outputs and used with either the optical LNB or the ODU32.
Distributing Signals for the Future
Utilising eye safe laser technology and the seemingly limitless bandwidth offered by fibre optic cable,the FibreIRS system delivers greater capacity, over wider distances,more cost effectively and to more homes than have ever been previously achievable.
The concept is fairly simple,the technology behind it not so!This unique and patented system spent over 8 years in development in R&D labs both in the UK & China prior to its launch in the summer of 2009.
The Fibre Integrated Reception System combines all of the viewing requirements of the modern family.Bringing together the available Satellite TV Broadcast,DigitalTerrestrialTV,DAB and FM Radio.
The FibreIRS system takes the now outmoded traditional 5 wire multiswitch distribution system and brings it squarely into the 21st Century.
Within 18 months of its launch Global Invacom Ltd.Deployed enough FibreIRS equipment to connect well over 500,000 integrated homes.It is anticipated that number will easily reach over 1 Million before the end of 2012.
The system is now specified in more than 25 countries worldwide.
Since the invention ofTelevision and Radio,the acceptable method of delivering signals to the individual home has always been catered for by the traditional rooftop aerial and a piece of coaxial cable.
Even satellite reception works on the same basic principles,the antenna (Dish) receives the signals from the satellite and those signals are passed along a piece of coaxial cable down to the satellite receiver located in the home.
All of the signals transported down the coaxial cable are collected by a device called aTuner built into the receiving equipment –Televisions,Satellite Receivers, DigitalTerrestrial SetTop Boxes,Radio’s etc.analogue or digital,all have these tuners built in.
Understanding the Basics
It is important to understand that for each receiver a single tuner is required and any device that has PersonalVideo Recorder (PVR) functionality,such as recording one channel whilst watching another requires a minimum of two tuners and so two coaxial cables connected to it.
With traditional terrestrial aerial reception,the signals travel only one way.In the case of satellite reception,communication between the dish and the receiver via the coaxial cable needs to be two way.
This is because the frequency ranges of the signals received from the satellite are beyond the capability of the coaxial cable.The satellite receiver in the home has to tell the electronic equipment (LNB/Low Noise Block) located outside at the dish,which section of the signals to allow through.
Think of it in its most basic form.By selecting channel 1 on your receiver you are in effect asking the dish to provide a specific frequency range in which the program information for channel 1 will be located.
Select channel 250 and the receiver requests a separate range of frequencies where the program information for channel 250 will be located.
There are 4 separate frequency bands that can be selected.
The choice is made by means of a 12v or 18v voltage switch and a 22 kHz tone,generated by the satellite receiver and sent up the coaxial cable as and when different channels are selected.
Traditional Coaxial Distribution
As we now understand how the basics work,we can look at how to distribute Satellite and Terrestrial TV signals around a communal building or multiple properties connected to a single antenna array.
We know that we need one coaxial cable (typically 7mm diameter) delivered into every home for each tuner to receive its broadcast signals.To facilitate this,a system is required that effectively allows each of those coaxial cables to be connected to their own dish electronics.
Traditionally a backbone of 5 coaxial cables is installed feeding switches (Multiswitches ) that emulate the LNB at the dish.
As with a single home installation the coaxial cables connected to these switches feed the correct frequency range to the tuner as the channels are changed.
This type of system has several limitations,such as interference from other signals ,distance (coaxial cable has very high signal loses at satellite frequencies and usually requires amplification),the physical dimensions of the coaxial backbone cable – five 7mm coaxial cables (minimum) is difficult to manage and discreetly run around a building.
The reality is that approximately 50% of the population want satellite TV.
Many PayTV operators are now recommending a minimum of three coaxial cables into the home to be able to receive full service – two for a PVR in the main viewing location,another to enable‘multiroom’ services in a bedroom or other location within the property.
The Logical Choice
In today’s digital world,and more so that of the future,the traditional multiswitch system will not suffice. One cable feeding one tuner is simply not enough to connect the basic equipment required,and expected by our technologically savvy society.
- Cost Effective
All Satellite,TV and Radio broadcast services and programming distributed to every connected home from one antenna location
- Energy Saving
Low power consumption and passive optical network
A single fibre replaces any number of copper based coaxial cables to the home or in the risers of apartment buildings
1’s,10’s,100’s,1000’s or 10,000s of individual homes can be connected to one FibreIRS
Broadcaster HD,3D & Interactive Services
- Plug and Play
Fully compatible with existing Satellite and Digital Terrestrial set top boxes
FibreIRS is platform neutral
FibreIRS Product Range
ODU32-Out Door Unit
|The ODU32 is designed to combine satellite and terrestrial signals,convert them to light and output them on a passive fibre optic network (PON)|
|The ODU32 receives its satellite signals from the Wholeband LNB - its digital terrestrial signal from a standard aerial array via a digital filtering system, DTT processor (Recommended).
The two sets of signals are then combined and converted to light and output via the laser at a frequency of 1310nm,the light signals are then split to feed two optical connectors,each capable of running a passive optical network of 32 connected homes,so 64 points in total.
The output level of the ODU32 +6.5dBm easily falls within the eye safe area of the laser safety standards and so suitable for use in domestic premises.
|The wholeband LNB stacks the frequencies received from the satellite into the 950MHz – 5.5GHz Band then using a large coaxial cable,feeds the signals down to the FibreIRS ODU32 out door unit|
Because the frequencies are so high the maximum recommended distance between theWholeband LNB and the ODU32 is 10m and specially ordered cables are required.
Note:The Optical LNB is not designed for use in fringe area satellite reception, under these circumstances the SQS system would be the better choice
Optical LNB MKII
Satellite only variant of the FibreIRS system
|The MarkII Optical LNB is capable of running 64 (satellite only) connected points over a 10Km network|
The termination of the 64 points can be either the Quad or Quatro MarkII GTUs,creating FibreToThe Home (FTTH) or FibreToThe Switch (FTTS) hybrid systems.
Note:-The Optical LNB is not designed for use in fringe area satellite reception,under these circumstances the SQS system would be the better choice.
Optical LNB MKII
|Same specification as the standard Mark II Optical LNB,designed to fit Prime Focus Dish|
|Note:-The Optical LNB is not designed for use in fringe area satellite reception,under these circumstances the SQS system would be the better choice.|
|TheWholeband splitter is able to accept the very high frequency ranges (9.5 – 5.45GHz) output from the FibreIRS wholeband LNB and equally split these signals between 4 X ODU32 units and so enabling a maximum of 256 FibreIRS points from a single antenna|
|The PRODU256 is a pre-built distribution headend containing all of the various components required to provide 256 points with a full FibreIRS services|
|A simple solution for medium sized systems,where all the main components are conveniently housed in a waterproof (IP65) cabinet,simply connect the wholeband LNB from the antenna,the terrestrial signals from the DTT Processor (recommended) and power via a coaxial input (PSU supplied) and the PRODU256 provides 8 optical outputs each capable of driving a 32 way passive optical network.|
Quad Mark II GTU
Gateway Termination Unit
|The Quad Mark II GTU is designed to accept optical signals received from either the ODU32 or the Optical LNB over the Passive Optical Network (PON)|
The GTU converts the optical signals back to exactly what was being received from the satellite and or the terrestrial antennas.The signals are then output on 4 individual F-type coaxial connectors.
Digital Terrestrial Television (DTT) - DigitalAudio Broadcasts (DAB) & FM are available on all 4 of the outputs,they are simply extracted either by connecting one of the outputs directly to the desired reception equipment or by using Diplexed or Triplexed Outlets If all services are required at the same time.
Note:It is important to note that should only terrestrial services be required the receiving equipment must either supply voltage back up the coaxial to the GTU or the recommended power supply must be used.
Quatro Mark II GTU
Gateway Termination Unit
|The Quatro Mark II GTU is designed to accept optical signals received from either the ODU32 or the Optical LNB over the Passive Optical Network (PON)|
The GTU converts the optical signals back to exactly what was being received from the satellite and or terrestrial antennas.
Used in conjunction with a GI –Approved fibre optic cable the Quatro GTU is a cost effective replacement for the bulky 5 core backbone coaxial cables needed in this type of system.
DTT - GTU
Gateway Termination Unit
|Designed with the developer/managing agent in mind the DTT GTU is a cost effective first step in provisioning a connected home within a building or development with a full Integrated Reception System|
This single DigitalTerrestrial GTU unlike its bigger brothers the Quad and the Quatro only converts the DTT/DAB/FM optical signals from a FibreIRS system back to the original form,leaving the satellite signals unconverted.
|Used between the FibreIRS GTU and the reception equipment it is designed to separate the frequency bands into their constituent parts,Satellite – Digital Terrestrial Television & DAB/FM|
|The satellite connection to theTriplex plate allows voltage and tone to pass through to the GTU allowing the receiver to switch between the satellite frequency bands.|
FibreIRS System Example
FibreIRS2SAT Product range
|The 2SAT ODU16 combines two standard DBS satellite inputs (e.g.ASTRA 28° & Eutelsat 13°) with the available digital terrestrial services|
As with the ODU32 the 2SAT operates at 1310nm, then utilising aWDM it combines signals at 1550nm providing the ODU with the ability to distribute both satellite services along with DTT-DAB & FM along a single fibre PON (passive optical network).
Unlike the ODU32 which has 32 outputs per optical connector,the 2SAT ODU16 outputs its optical signals via two FC/PC connectors providing a maximum capacity of 2 x 16 = 32 optical points spread over a 1km radius.
|The combined signals arrive the 2SAT GTU from the PON (Passive Optical Network) and are routed straight into a WDM which separates the two satellites optically and diverts the 1310nm & 1550nm to two Standard GTUs|
Each GTU now converts its assigned optical wavelength back to the original electrical RF/Satellite signals provided by the two dishes and aerial array.
There are both Quad and Quatro 2SAT GTU's available,the Quatro has 9 outputs,eight presenting the 4 Satellite frequencies from both input satellites and one presenting the DTTDAB-FM from the aerials via the DTT Processor (recommended).
FibreIRS 2SAT system example
Fibre SQS Product range
SQS - Satellite Quadrant Stacking
Stacker and GTUs
|The SQS takes up to 4 x 1GHz Satellite frequencies broadcast from standard DBS Satellites,it then stacks and converts these frequencies ready for outputting in an optical format via two lasers combined running at 1550nm & 1530nm|
As the system does not rely on the signal frequency plan from any particular satellite it can easily accept signals from multiple satellites.Choose any 1GHz (950-2150MHz) frequency range from any satellite and input in to the SQS Stacker.
Note:- Input one of the SQS Stacker the installer has the ability to diplex DTT/DAB & FM signals to the incoming satellite IF Frequency (1GHz 9502150MHz) utilising a standard IF/UHF Diplexer,this then provides full FibresIRS including terrestrial signals throughout the system.
Using WDM technology the two optical wavelengths are combined and output via the optical FC/PC connector.Without any further amplification the SQS is capable of running 64 points over a 10Km Passive Optical Network.
At any of the 64 connected points a FibreSQS Quad or Quatro GTU can be located providing the terrestrial & satellite frequencies in either a Quatro (fixed frequency outputs) or Quad all 4 satellite & terrestrial frequencies presented on each of the 4 outputs.
Fibre SQS system example
The DTT Processor is an 8 channel high quality, cost effective filter.
To understand its workings we need to understand a little about how ourTV pictures arrive at our TV.
The UHF (Ultra High Frequency 470 – 862MHz) frequency spectrum is where we receive our DTT (DigitalTerrestrialTelevision)TV programmes from.
Some countries around the world use the spectrum below this,VHF (Very High Frequency).
These spectrums are broken up into segments 8MHz wide and confusingly called,channels,for the UK there are 49 channels between 470MHz & 862MHz labelled 21 – 69,each of these channels had the ability to carry one analogueTV channel.
With Digital Terrestrial Television each of the 8MHz segments can house around 8 channels providing the broadcasters with the obvious ability to transmit many more channels in less of the frequency spectrum than is currently used.
This frees up space that the governments can then sell off to the private sector for re-use with other services.
Unlike analogue transmissions where interference degraded the signal,the viewer saw the interference on the TV screen as what is commonly described as snow or ghosting,double imaging,as the interference got more intense the pictures just got worse.
With Digital Terrestrial Television this problem is not one of degrading pictures but rather one of no pictures.Known as the Digital Cliff - Signals get to the point where the interference affects the picture quality; the picture simply freezes and stays that way until the receiver starts to get a signal again with lower corruption levels.
For this reason we would always recommend a Digital Processor is used to supply not just the FibreIRS distribution equipment but any communal distribution equipment.Digital transmissions are generally more robust than their analogue counterparts but when corrupted by any sort of interference there is no warning or indication that there is a problem,no gradually degrading pictures – just no pictures at all.
The DTT Processor is made up of a number of SAW filter modules mounted in a single housing,each module is frequency agile and can be individually set to any channel between 21 & 69,allowing the wanted channel through and filtering out the rest with very high rejection of the unwanted channel located next to it.
The Processor is pre-loaded with 6 Filter modules with space to add an extra two if required,currently the UK uses 6 channels to provide the Digital Terrestrial Services,each filter provides better than 45dB rejection to the channel next to it so even when the new 4G services are rolled out,properties located close to the new transmitters will have sufficient filtering to cope with the high levels of interference expected.
Fibre Optic Cables
The FibreIRS system works on a type of fibre known as“single mode”in reality there are many types of single mode fibres and the manufacturer of the FibreIRS system,Global Invacom Ltd.Insist that fibres used in conjunction with the FibreIRS products are approved for use.
FibreIRS Systems installed without approved fibre optic cables run the risk of the manufacturer nullifying the warranty of the equipment connected to such networks.
|GI-3.0 is only 3mm in diameter and utilises Kevlar for tensile strength and steel armour for high impact resistance.
Although suitable for outdoor use as the outer jacket is UV stabilised,it is ideal for running throughout the infrastructure of buildings or discreetly around visible areas where there is no other option.
|GI-5.5 has an outer diameter of only +\-5.8mm and carries between 2 & 8 G657a bend impervious fibres.This highly robust cable can be used almost anywhere,again the outer jacket is UV stabilised LSZH,so above ground on the outside of buildings or as a backbone throughout the infrastructure is no problem.
GI-5.5 can also be used within underground ducting or even directly buried in the earth; it has a gel filled water blocking tube around the fibres along with the E-glass rodent resistant yarn and carries a 10 year manufacturer’s warranty.
PON passive optical network
A passive optical network is simply just that - a distribution network made up of passive components, fibre cables, splitters, taps etc. none of which are active.
These networks simply provide a very low loss path from the headend equipment (ODU32/Optical LNB etc.) to the Gateway Termination Units (GTU’s) in the connected home.
Signals within the FibreIRS system usually run in only one direction although with the introduction of WDM technology this can be made bidirectional in some network topologies as for instance in the case of telephone companies.
Passive Optical Splitters
|Passive optical splitters are an integral part of the PON, they simply split the light transmitted by the ODU32/Optical LNB into equal parts.
A 1x2 splitter separates the light into two equal parts, a 1x4 splitter separates the light into 4 equal parts and so it goes on, usually to a maximum of a 1x64 split.
When the transmitted light is split an amount of signal is lost and as the split ratio is increased the amount of signal loss is therefore greater, for example the 1x2 splitter will on average lose 3.5dB of its signal and a 1x8 splitter will lose around 10dB.
This loss inevitably denotes the size of the system the designer is able to build and the number of connected homes that can function on it.
Add in too many splitters and the GTUs will not receive enough signals to operate.
WDM – Wave Division Multiplexer
|Combines two or more optical frequencies together so they can be transmitted simultaneously down a single fibre optic cable.
Same WDM device can be used in reverse at the opposite end of the cable to separate the two frequencies back out.
Termination & Splicing
Although the manufacturer of the FibreIRS system provides and recommends single mode fibre optic cables pre terminated with FC/PC connectors, suitable for use with the system.
There are companies that still prefer to terminate their own cables using cleavers and fusion splicing.
Lasers – Eye safe
|Although the FibreIRS system optical output levels meet the laser safety standard Class - 1 the manufacturers believe you cannot be too safe and have voluntarily classed the system as 1M|
This class is safe for viewing directly with the naked eye, but may be hazardous to view with the aid of optical instruments.