175:(low frequency/horizontal polarity, high frequency/horizontal polarity, low frequency/vertical polarity, high frequency/vertical polarity) are received by a conventional front end, amplified and downconverted to the L-band, to be fed to a number of SatCR (Satellite Channel Router) – one for each user that can be connected - to further downconvert the required section of the received spectrum to centre on the user band IF frequency. The LNB further includes a
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The extremely low signal loss through fibre optic cables and complete elimination of interference and noise picked up by the cable mean that such a system can support very long cable runs between the dish and the converters in a widespread communal dish system, and a smaller dish can be used as the
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dual-tuner DVR receivers. While BSkyB SCR is slightly different to the CENELEC EN50494 standard most
European SCR compatible multiswitches support both standard and BSkyB modes. Most Sky branded receivers including the Sky Q model can be used on SatCR systems by enabling a hidden option. Sky Italia
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A receiver required to operate in a single-cable distribution installation can be essentially conventional. It should be able to tune to the user channel (within the normal IF tuning range) and modulate the LNB power voltage with the 22 kHz signal required for issuing DiSEqC commands. It will
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band. This fixed frequency is unique for each tuner on the single cable output. Each tuner in the STB always stays at this fixed frequency while the CSS IC translates the user requested content down the cable to this exact frequency. This architecture requires no hardware change to the STB design.
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The SatCR Adaptor connects to four outputs of an IRS multiswitch and provides a single SatCR output that is typically connected to the existing single coaxial cable to the household to be converted. A further four conventional IF outputs are provided to recover usage of the existing multiswitch
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UK company Global
Invacom (which also developed and markets SatCR single-cable distribution equipment) has developed a low cost system of fibre optic distribution suitable for domestic installations and small or medium commercial communal dish systems, with an optical output LNB, fibre cables,
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to provide a single SatCR output and a conventional LNB output. The four IF inputs from the
Quattro LNB are looped through to outputs so the unit can be cascaded to further SatCR switches or to the existing multiswitches of the IRS, so an SatCR-enabled output is provided without replacing the
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and cabling to provide two or more feeds per household is usually both costly and invasive. However, individual households or sections of the system can be converted to SatCR distribution so that multiple tuners within a household can be fed via the single existing coaxial cable.
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Alternatively, a single-cable distribution system can use a conventional LNB feeding the four sub-bands to a separate SatCR receivers, as a substitute for a traditional multiswitch, that needs a dedicated coaxial cable for every receiver (or tuner) connected.
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The
Unicable Interoperability Platform is open to companies designing and/or marketing satellite and other broadcast-related products. The platform is designed to facilitate the acceptance of Unicable-certified solutions in the consumer TV broadcast market.
273:. The high bandwidth of optical connections allows for the full satellite spectrum received at the dish to be accommodated on one fibre optic cable, which can be easily optically split to provide that full spectrum signal to a large number of receivers.
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For correct operation, two-way splitters are required to feed the combined signal to each receiver. These allow bi-directional passage of both RF and DC signals, to provide for the passing of DiSEqC commands between the LNB and receiver(s).
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Global
Invacom's SatCR Adaptor unit performs a similar function but is connected to the existing multiswitch outputs, to provide SatCR compatibility for one connection (one household) of an existing IRS.
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outputs for other households. Within the SatCR enabled household, a splitter and power injector provides power to the SatCR Adaptor and splits the signal to feed the separate tuners connected.
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As of March 2010, SES' Single Cable
Distribution factsheet lists 88 receivers as supporting single-cable distribution technology although this list is not exhaustive. Several receivers for the
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Unicable LNBs and SatCRs also usually include either a legacy mode of operation or a legacy output which provides conventional LNB IF for use with an installation of non-Unicable receivers.
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Versions of the
Unicable Switch to provide for four and eight tuners within a household are available, and to combine a digital terrestrial signal onto the SatCR-enabled output as well.
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An alternative approach to that provided by single-cable distribution of the signal from a single LNB to multiple receivers, or receivers with multiple tuners, is offered by the use of
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The converted transponders of the various users are then combined, and sent via the single coaxial cable to the receivers. The combined signal is tapped or split to reach every user.
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that greatly reduce the cost of implementing the single-cable distribution function. A channel-stacking switch IC is a multiple-input multiple-output device. It typically has N
179:(i.e. reverse splitter) to merge the user bands and a microcontroller to receive the instructions as to which frequency is required by each user and control the SatCR chips.
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inputs that can be cascaded to additional chips as required (to expand output capacity). These inputs are fed into a large N-pole M-Throw switch that outputs to
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trademark from FTA Communications
Technologies. Unicable uses an integrated software and hardware solution that allows Unicable-certified DVRs and receivers to
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ansi.org - BS EN 50494:2007 Satellite signal distribution over a single coaxial cable in single dwelling installations (British
Standard)
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Without single-cable distribution, providing full-spectrum access for multiple receivers, or receivers with multiple tuners, in a
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Communications protocol between the CSS IC and the STB is handled via the CENELEC EN50494 standard or proprietary systems.
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equipment to multiple tuners, to provide independent tuning across the whole range of satellite reception for each tuner.
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existing LNB or affecting the provision for conventional receivers in other households served by the rest of the system.
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217:(IRS) often provide only one satellite feed to each household, preventing the use of dual-tuner DVRs. Upgrading the
158:. Each mixer path then translates only the user requested transponder to a predetermined fixed frequency within the
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splitters, and converter units to return the optical signal to an electrical one compatible with legacy receivers.
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378:- Single Cable Distribution White Paper, Brandon, Troy. "Changing DBS Delivery - The Single Wire Solution" (2008)
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in the dish-end equipment (an LNB or distribution unit) converts the received signal to the correct user band
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in 2007 for the proposal and initial development of optical fibre distribution systems for satellite TV.
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Special LNBs have been developed for use in single-cable distribution systems. All four sub-bands of the
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has required a separate coaxial cable feeding each tuner from the antenna equipment (either multiple
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522:"Global Communications, Invacom, And Era Technology Winners of the SES ASTRA Innovation Contest"
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A European industry standard for distributing satellite signals over a single coaxial cable -
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then require only software modification to operate as a single-cable distribution receiver.
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Equipment such as
Inverto's Unicable Cascadable Switch can be connected to a conventional
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Single-cable distribution technology can be found in commercial equipment with the
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distribution system) because of the large bandwidth requirement of the signals.
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Each satellite receiver in the installation has a dedicated user band of a
486:"Unitron Group • Your dedicated partner for customize IP and RF solutions"
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Global Invacom won the Astra Innovation Contest run by satellite operator
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selected programming when using Unicable LNB or multiswitching products.
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Single-cable distribution technology enables one coaxial cable from the
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SES ASTRA "Single Cable Distribution" (August, 2008). Company factsheet
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to enable flats and homes with single-feed distribution systems to fit
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EN50494 - was defined in 2007 and developed by a consortium led by
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128:. The receiver requests a particular transponder frequency via a
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Global Invacom developed the SatCR Adaptor in conjunction with
439:"Unicable cascadable switch 4 User Bands, and 1 Legacy port"
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394:. FTA Communications Technologies. Company factsheet
500:"Fibre optic distribution products information"
201:German high definition platform broadcast from
524:(Press release). SES ASTRA. September 28, 2007
257:receivers comply with the unicable standard.
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45:technology that enables the delivery of
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146:Silicon vendors have developed complex
389:"One Cable For All Your Digital Needs"
205:are compatible with the SatCR system.
362:Bains, Geoff. "Inverto Unicable LNB"
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140:centre frequency for that receiver.
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209:Use in legacy communal TV systems
49:to multiple users over a single
364:What Satellite & Digital TV
64:(DVRs) and high-end receivers.
419:. SES Astra. Company factsheet
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298:Low-noise block downconverter
303:Fibre satellite distribution
267:fibre satellite distribution
215:integrated reception systems
124:approximately the same as a
414:"Single Cable Distribution"
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75:, a multi-output LNB or a
39:Single-cable distribution
366:(February, 2006) pp60-62
18:Satellite channel router
261:Fibre-optic alternative
62:digital video recorders
27:Satellite TV technology
132:-compliant command. A
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555:Television technology
353:$ 257 read 2012-06-29
57:devices such as twin-
47:broadcast programming
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560:Satellite television
313:Satellite television
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323:Microwave antenna
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116:How it works
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43:satellite TV
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528:January 26,
506:November 8,
470:December 1,
445:December 1,
423:December 1,
398:December 1,
227:quattro LNB
126:transponder
77:multiswitch
544:Categories
329:References
441:. Inverto
167:Equipment
122:bandwidth
106:multiplex
376:ENTROPIC
292:See also
177:combiner
156:M mixers
102:Unicable
34:Unicable
254:Sky+ HD
173:Ku band
152:1.2 GHz
91:CENELEC
84:antenna
269:using
130:DiSEqC
464:(PDF)
417:(PDF)
392:(PDF)
246:BSkyB
134:mixer
59:tuner
41:is a
530:2012
508:2009
472:2010
447:2010
425:2010
400:2010
252:and
250:Sky+
73:LNBs
308:SES
286:SES
199:HD+
95:SES
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138:IF
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