Spaun optical


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Spaun optical

  1. 1. TEST REPORT Optical Distribution SystemSPAUN SOTx1310607 NF &SORx1310607 NFStraightforward Solution SPAUN SOTx131 12-01/201 0607 NF & 1for Optical Fibers in SORx1310607 NF Connect endles s satellite and ter rec eivers to one restrial single rec eption Ideally suited for point. large apartment blocks.Satellite Signal DistributionThe attenuation of signal switchesand coaxial cables themselves inlarge satellite TV distribution systemsis a factor every installer must takeinto account. Less experiencedreaders might think that one cancompensate for that by insertingextra amplifiers in the signal paths.But it helps only to some extent; wecan maintain reasonable signal levelbut can not prevent signal qualitydegradation. 0.35 TELE-satellite World Download this report in other languages from the Internet: Arabic ‫العربية‬ Indonesian Indonesia Czech Česky German Deutsch English English Spanish Español Farsi ‫فارس ي‬ French Français 0.37 Hebrew ‫עברית‬ Mandarin 中文 Dutch Nederlands Polish Polski Portuguese Português Romanian Românesc Russian Русский Turkish Türkçe Available online starting from 3 December 201060 TELE-satellite — Global Digital TV Magazine — 12-01/201 — 1
  2. 2. ■ Bulding Blocks of Hybrid Fiber- Coaxial Distri- bution System The only way to keep theC/N ratio really high is touse low-loss switches andtransmission lines. But thebest solution that is availabletoday is the usage of opticalfiber cables. They can have aslow an attenuation as 0.2 dBper kilometer and extremelylow error rates (10-10) evenat the highest bit rates. Of course, everybodyknows that this is not elec-trical current but a lightbeam that travels along theoptical fiber cable. So, weneed to convert the electri-cal signal into a modulated find out with our measure- The SOTx 1310607 NF has range from 47 through 2200laser light beam. This can ments. But before the test one RF input to which we can MHz, which covers both thebe done either directly in the itself, we took a closer look at link up either the IF satellite terrestrial and the satel-LNB – see other such test the units. As with all SPAUN signal alone or the IF satellite lite frequency range. A nicereports elsewhere in TELE- products, their workmanship plus terrestrial signal, assum- feature is the independentsatellite - or with the help of is perfect. Also the labels put ing that we combined them adjustment of the satellitean external converter. In the on the top cover in German together earlier (e.g. with signal levels and the terres-latter case, we simply use a and English leave no doubt the help of a diplexer). This trial signal level in the input:regular Quattro or Quad LNB what should be connected is possible because the input SPAUN has built into its unitand then convert its four out- where. is designed for the frequency two 0-12 dB attenuators.puts to light. SPAUN, the wellknown German manufacturer,has sent us their latest prod- graph 1uct designed for this purpose– SOTx131607 NF. They callit optical transmitter. At the other end of the opti-cal fiber we need to do thereverse operation – demodu-lation back to an electricalsignal. SPAUN called the unitdoing this function an opti-cal receiver and assignedto it the model number:SORx1310607 NF. Fine, butdo not extra modulation anddemodulation spoil C/N of thesignal? This would ruin all thebenefits introduced by low-loss optical fiber cables. Thisis exactly what we wanted to62 TELE-satellite — Global Digital TV Magazine — 12-01/201 — 1
  3. 3. to the first transmitter and connect the second trans- mitter with a piece of coaxial cable. In this way, we do not need separate power supply units for every transmitter. SPAUN’s PSU sold in a set is strong enough to power up to four transmitters assum- ing no power for an LNB is needed. If we need to power a LNB, which will usually be the case, the number is reduced to three transmit- ters. Nevertheless, it is a simplification of the whole installation. The optical transmit- ter also has a LED indicator which except for signaling the connection of power can also inform us about a short circuit in the LNB input. It simply starts blinking. That’s very intuitive. Another electrical output is the test signal described as -20 dB. This is simply the input attenuated by 20 dB which is the light modulator input. We can use it to check if the RF signal is really pre- Optical transmitters cannot the help of a switch mounted 12V/22kHz, 18V/22kHz). If sent on the transmitter inputget power supply via an opti- on the transmitter cover, we we have a signal source not and what is its fiber cable. We need to select the proper voltage and requiring DC power, we canconnect an external 19 V DC presence of 22 kHz signal. switch it off completely. The optical output SC/APCpower supply. SPAUN adds a Thanks to that, we can use is protected with a black coversuitable one to every SOTx either a Quattro LNB (then, The SOTx 1310607 NF has which has to be removed1310607 NF. Electric power we simply set 12 V in all four two F type plugs connected before an optical fiber is con-is needed not only for the signal paths) or a Quad LNB in parallel for power supply. nected. By the way, connect-unit but also to supply the (then, we need to set each Thanks to that we can con- ing optical inputs and outputsLNB connected to it. With path differently: 12V, 18V, nect one power supply unit is a dream for a satellite installer. Press gently until you feel a click and that’s it. graph 2 What a nice difference after F connectors! To send “down” four sig- nals from a Quattro LNB we need to use four SOTx 1310607 NF transmitters. Fortunately, it was possible to miniaturize the receiver much more than the trans- mitter. The SORx 1310607 NF is a quad receiver: it has four optical inputs and four electrical RF outputs. In con- trast to the transmitter, the receiver is shipped without a power supply, because it is supposed to get its power from the central distribu- tion unit or multiswitch, like — 12-01/201 — 1 TELE-satellite — Global Digital TV Magazine 63
  4. 4. any regular LNB. A coaxial plug called “C” at the optical receiver acts as connector to power; here the user is sup- posed to connect the coaxial cable from a central unit or multiswitch. In our case we did it differ- ently: as the optical receiver needs exactly the same DC voltage as the transmitter, we took one power supply units from the transmitter sets. The units are very ver- satile: not only do they offer a wide supply voltage range (100...240V AC / 47...63 Hz) but SPAUN also delivers a number of exchangeable pin adapters so you can use it anywhere in the world. The DC supply can be con- nected to any of the two F connectors. As in the trans- mitter, they are connected in parallel. So if the DC power is needed for a similar device in the neighborhood, we will use graph 3 rather a coaxial cable than another power supply unit. An LED indicator shows if the unit is powered. The transmitter and the receiver can be mounted on the wall with only 2 screws. They should not be exposed to the open air but rather used indoors. However, their oper- ating temperature is pretty wide: -20°C through +50°C. The brochure attached to every unit is printed in Eng- lish and German and provides all necessary information along with exemplary appli- graph 4 cation circuits. Measurements After getting familiar with the units, time had come to put all the blocks together and see what kind of performance they offer. SPAUN recom- mends to supply the optical fiber distribution system with really strong signals: 80-83 dBµV for the satellite IF and 85 for terrestrial. The maxi- mum value is 95 dBµV. Steffen Kuck, SPAUN’s Technical Manager, explained64 TELE-satellite — Global Digital TV Magazine — 12-01/201 — 1
  5. 5. ■ Steffen Kuck strongest carrier (equal to several hundreds of satel- is SPAUN‘s SPAUN recommendation) lite receivers! The number Technical Manager for the everything stayed perfect of subscribers which can be optical system (48 vs. 47 dB). SPAUN’s opti- reached with this new tech- cal system really just trans- nology is really impressive. ports the input signal as it is received. At the same time, one mustto us: “Our optical system 5 dB or 10 dB lower than the remember that optical fibersis designed for maximum system input depending on Applications do not allow DiSEqC signalsperformance and as such the attenuator we used. to pass. To multiply a number These new optical unitsrequires a strong input of satellites available to the from SPAUN open a brandsignal.” But what about signal qual- end user, one must multiply new era in large TV distribu- ity? This can be assessed by the number of optical fibers tion networks. Every opti- We supplied our test unit Modulation Error Ratio in the (8 for 2 satellites, 12 for 3 cal signal on the transmitterwith a real life signal from input and in the output. We satellites and so on) as well output can be split to 32HotBird satellite. We con- noticed very small deteriora- as transmitters and receiv- optical fibers and thus createnected the transmitters with tion of signal quality. (graph ers. enormous backbones for thethe receiver with short optical 3., graph 4.) It is almost network.fiber cables. So, to simulate nothing. Should we have 10 SPAUN’s new optical trans-optical splitters (or very, very or 15 dB attenuation in a long mitter system not only makes For example, on every floorlong cables), we inserted a coax cable, the signal could installation easier but also of a large apartment block we10 dB optical attenuator and be already on the edge of the secures that each end-user can have an optical receiverlater even a 15 dB attenu- reception threshold. will have a strong and perfect with four electrical outputsator. As you can see in the signal available at his socket, which in turn can be fed tographs (graph 1., graph 2.), But what about the analog even at the most remote the conventional multiswitchthe receiver output was only terrestrial signals? For the corner of a big network. and distributed further to ENERGY Expert Opinion DIAGRAM + Very good workmanship DC power “sharing” among the units Apparent Power Excellent performance for DVB-S signals even if below the recommended signal level (80-83 dBµV) Very good performance for analog TV signals Jacek Pawlowski for the recommended high input levels (85 dBµV) TELE-satellite Test Center Possibility to create really large distribution Poland networks Active Power Possibility to send signal over a long distance - Mode Apparent Active Factor Reception 17 W 6W 0.35 nonePower consumption of SORx 1310607 NF Optical Receiver meets the TECHNICALspecification (6W). DATA Manufacturer SPAUN Electronic, Singen, Germany ENERGY Fax +49 (0) 7731 – 8673-17 DIAGRAM E-mail Model SOTx 1310607 NF & SORx 1310607 NF Function Optical Transmitter & Optical Receiver Apparent Power Frequency range 47 … 2200 MHz Optical wavelength 1310 nm Power consumption 6 W (plus LNB power for transmitter) Maximum supply current of the connected 400 mA LNB Active Power Transmitter output power (optical) 6 dBm Mode Apparent Active Factor Reception 29 W 11 W 0.37 Transmitter maximum RF input 95 dBµV Receiver maximum RF output level 100 dBµV (Terr.), 110 dBµV (SAT) Receiver input range (optical) 0 … -12 dBm RF and DC voltage connector typ FPower consumption of SOTx 1310607 NF Optical Transmitter is about 11 Optical connector type SC/APCW but only 6 W is consumed by the transmitter itself. The rest is used to Operating temperature -20 C° ... 50 C°supply the connected LNB.66 TELE-satellite — Global Digital TV Magazine — 12-01/201 — 1