USER MANUAL - Kramer Electronics
Contents
1. CONTROLS Video gain 1 8dB to 2 3dB EQ above 2 5 MHz 0dB to 16dB audio OdB to 52dB loop termination signal invert POWER SOURCE 12 VDC 40mA DIMENSIONS 12cm x 7 5cm x 2 5cm 4 7 x 2 95 x 0 98 W D H WEIGHT 0 28kg 0 62lbs Approx ACCESSORIES Power supply mounting bracket OPTIONS Model VA 50P power supply with six 12VDC outlets RK T1 RK T3 19 rack adapters 1 Specifications are subject to change without notice 16 KRAMER SIMPLE CREATIVE TECHNOLOGY Technical Specifications Table 9 Technical Specifications of the 711xl and the 712xl 711xl 712xl INPUT Video 1Vpp 75Q on a BNC connector 6 pole detachable terminal block audio 1Vpp 33KQ on RCA connectors connector OUTPUT 6 pole detachable terminal block Video 1Vpp 75Q on a BNC connector connector audio 1Vpp 1500 on RCA connectors MAX SIGNAL LEVEL 2 1Vpp video 4 2Vpp audio VIDEO BANDWIDTH 3dB 45MHz AUDIO BANDWIDTH 3dB 100kHz DIFF GAIN 1 4 DIFF PHASE 0 6 Deg VIDEO S N RATIO 76dB AUDIO S N RATIO 77d0B unweighted AUDIO THD NOISE 0 033 1kHz AUDIO 2nd HARMONIC 0 002 MAX SIGNAL LEVEL 1 7Vpp video 4 2Vpp audio POWER SOURCE 12 VDC 80mA DIMENSIONS 12cm x 7 5cm x 2 5cm 4 7 x 2 95 x 0 98 W D H WEIGHT 0 28kg 0 62lbs approx each ACCESSORIES Power supply mounting bracket each OPT2. see section 5 e The 711xl Video Audio Line transmitter and the 712x1 Video Audio Line Receiver see section 6 To achieve the best performance e Connect only good quality connection cables thus avoiding interference deterioration in signal quality due to poor matching and elevated noise levels often associated with low quality cables e Avoid interference from neighboring electrical appliances and position your Kramer products away from moisture excessive sunlight and dust 2 KRAMER SIMPLE CREATIVE TECHNOLOGY The TP 1xl and TP 2x1 Video Line Transmitter and Receiver 4 The TP 1xl and TP 2xl Video Line Transmitter and Receiver This section Overviews the TP 1xl and TP 2xl see section 4 1 Defines your TP 1xl see section 4 2 Defines your TP 2x see section 4 3 Describes how to connect the TP 1xl TP 2xl Video Line Transmitter Receiver see section 4 4 4 1 An Overview of the TP 1xI TP 2xl The TP 1xl and TP 2xl are a twisted pair transmitter and receiver for composite video signals The TP 1xl transmitter converts a composite video signal to a twisted pair signal and the TP 2x receiver converts the twisted pair signal back into a composite video signal The TP 1x1 TP 2x also feature A bandwidth of 13MHz at 300 meters 960 feet Twisted pair inputs and outputs on a terminal block connector Level GAIN and equalization HF controls A system range of up to 1000 meters 3200 feet A LOOP terminal block o
3. of the 708 Video Audio Line Receiver The 708 receives video and unbalanced mono audio signals converted to a twisted pair signal and converts the signal back to composite video and twisted pair signals In addition the 708 features A bandwidth of 58MHz at 400 meters RJ 11 twisted pair connections Level VIDEO GAIN and equalization EQ controls A looping input A selectable input signal termination button A polarity inverter switch that inverts the incoming polarity The 708 is part of the Kramer TOOLS family of compact high quality and cost effective solutions and is fed from an external 12V DC source making it suitable for field operation KRAMER SIMPLE CREATIVE TECHNOLOGY The 708 Video Audio Line Receiver 5 2 Your 708 Video Audio Line Receiver Figure 5 and Table 3 define the 708 VIDEO OUT EQ VIDEO GAIN KRAMER TOOL AUDIO TERM LINE IN OUT S Video Audio Line Receiver Figure 5 708 Video Audio Line Receiver Table 3 708 Video Audio Line Receiver Features Feature Function 1 VIDEO OUT BNC Connector Connect to the composite video acceptor 2 EQ Trimmer Turn to adjust the output signal level 3 VIDEO GAIN Trimmer Turn to adjust the output signal equalization 4 AUDIO OUT RCA Connector Connect to the audio acceptor 5 TERM Push Button When pressed terminates the unit that is the last in the line not looped 6 INV Push Button When presse
4. the CV OUT BNC connector to a composite video acceptor for example a display Connect the LINE OUT connector of the TP 1xl to the LINE IN connector of the TP 2xl via twisted pair cabling maximum range of up to 3200ft 1000m If required connect the LINE LOOP connector of the TP 2xl to the LINE IN connector of an additional TP 2xl as illustrated in Figure 4 Connect the power cord on the TP 1xl and the TP 2xl not illustrated in Figure 3 On the TP 1xl and or the TP 2xl if required adjust the COMP GAIN and HF levels by inserting a screwdriver into each of the small holes and carefully rotating them 1 The second and third terminal marked and respectively 2 The first and second terminal marked and respectively 3 The third and fourth terminal marked and respectively KRAMER SIMPLE CREATIVE TECHNOLOGY The TP 1xl and TP 2x1 Video Line Transmitter and Receiver Composites Video Player Figure 3 Connecting the TP 1xl TP 2xl Video Line Transmitter Receiver System From the LINE OUT connector of the TP 1xl unit To the LINE IN connector of an additional TP 2xl unit Figure 4 Connecting an Additional TP 2xl Unit The 708 Video Audio Line Receiver 5 1 The 708 Video Audio Line Receiver This section Overviews the 708 see section 5 1 Defines your 708 section 5 2 Describes how to connect the 708 Video Audio Line Receiver see section 5 3 An Overview
5. 2 TP 2xl Video Line Receiver Features Feature Function 1 POWER Switch Illuminated switch for turning the unit ON or OFF 2 CV OUT BNC Connector Connect to the composite video acceptor 3 COMP _ GAIN Trimmer Turn to adjust the output signal level 4 HF Trimmer Turn to adjust the output signal equalization 5 LINE IN Terminal Block Connect to the LINE OUT terminal block on the TP 1xI 6 LOOP Terminal Connect to the LINE IN terminal block of an additional Block receiver 7 TERM button When pressed terminates the unit that is the last in the line not looped 8 Power Connector with Fuse AC connector enabling power supply to the unit 1 Insert a screwdriver into the hole and carefully rotate it to trim the level 2 The first and second blocks marked and video and video respectively 3 The third and fourth blocks marked and video and video respectively The TP 1xl and TP 2x1 Video Line Transmitter and Receiver 4 4 Connecting the TP 1xI TP 2xl Video Line Transmitter Receiver You can use the TP 1xl and TP 2x to configure a Video Line Transmitter and Receiver system To connect the TP 1xl Video Line Transmitter with the TP 2xl Video Line Receiver as illustrated in the example in Figure 3 do the following 1 Connect a composite video source for example a composite video player to the CV IN BNC connector of the TP 1xl On the TP 2xl connect
6. IONS RK T1 RK T3 19 inch rack adapters 17 LIMITED WARRANTY Kramer Electronics hereafter Kramer warrants this product free from defects in material and workmanship under the following terms HOW LONG IS THE WARRANTY Labor and parts are warranted for seven years from the date of the first customer purchase WHO IS PROTECTED Only the first purchase customer may enforce this warranty WHAT IS COVERED AND WHAT IS NOT COVERED Except as below this warranty covers all defects in material or workmanship in this product The following are not covered by the warranty I Any product which is not distributed by Kramer or which is not purchased from an authorized Kramer dealer If you are uncertain as to whether a dealer is authorized please contact Kramer at one of the agents listed in the web site www kramerelectronics com 2 Any product on which the serial number has been defaced modified or removed 35 Damage deterioration or malfunction resulting from i Accident misuse abuse neglect fire water lightning or other acts of nature ii Product modification or failure to follow instructions supplied with the product iii Repair or attempted repair by anyone not authorized by Kramer iv Any shipment of the product claims must be presented to the carrier v Removal or installation of the product vi Any other cause which does not relate to a product defect vii Cartons equipment enclosures cables or accesso
7. Kramer Electronics Ltd ah KRAMER USER MANUAL Models TP 1xl Video Line Transmitter TP 2xl Video Line Receiver 708 Video Audio Line Receiver 711xl Video Audio Line Transmitter 712xl Video Audio Line Receiver Contents Contents 1 Introduction 2 Getting Started 3 Overview 4 The TP 1xl and TP 2xl Video Line Transmitter and Receiver 4 1 An Overview of the TP 1x1 TP 2x1 4 2 Your TP 1xl Video Line Transmitter 4 3 Your TP 2xl Video Line Receiver 4 4 Connecting the TP 1x1 TP 2xl Video Line Transmitter Receiver 5 The 708 Video Audio Line Receiver 5 1 An Overview of the 708 Video Audio Line Receiver 5 2 Your 708 Video Audio Line Receiver 5 3 Connecting the 708 Video Audio Line Receiver 6 The 711xl and 712xl Video Audio Line Transmitter and Receiver 6 1 An Overview of the 711xl 712xl 6 2 Your 711x1 Video Audio Line Transmitter 6 3 Your 712x1 Video Audio Line Receiver 6 4 The 6 pole Detachable Terminal Block Connector Pinout 6 5 Connecting the 711x1 and the 712x1l 7 Technical Specifications Figures Figure 1 TP 1xl Video Line Transmitter Figure 2 TP 2x1 Video Line Receiver Figure 3 Connecting the TP 1xl TP 2xl Video Line Transmitter Receiver System Figure 4 Connecting an Additional TP 2x1 Unit Figure 5 708 Video Audio Line Receiver Figure 6 Connecting the 708 Video Audio Line Receiver Figure 7 711xl Video Audio Line Transmitter Figure 8 712x Video Audio Line Receiver Figure 9 Connec
8. LE CREATIVE TECHNOLOGY For the latest information on our products and a list of Kramer distributors visit our Web site www kramerelectronics com where updates to this user manual may be found We welcome your questions comments and feedback Safety Warning Disconnect the unit from the power supply before opening servicing Caution 9001 O 2 ge ia Institute of Quality amp Control Kramer Electronics Ltd Web site www kramerelectronics com E mail info kramerel com P N 2900 000164 REV 1
9. O IN KRAMER TOOLS Video Audio Line Transmitter Figure 7 711xl Video Audio Line Transmitter Table 4 711xl Video Audio Line Transmitter Features Feature Function 1 AUDIO RIGHT RCA Connect to the right unbalanced stereo audio source IN Connector 2 LEFT RCA Connect to the left unbalanced stereo audio source Connector 3 LINE OUT 6 pole Detachable Terminal Block Connector Connect to the LINE IN 6 pole detachable block connector of the 712xl see section 6 4 for pinout 4 VIDEO IN BNC Connector Connect to composite video source oa ON LED Lights when receiving power 6 12V DC 12V DC connector for powering the unit 12 KRAMER SIMPLE CREATIVE TECHNOLOGY The 711xl and 712x1 Video Audio Line Transmitter and Receiver 6 3 Your 712xl Video Audio Line Receiver Figure 8 and Table 5 define the 712xl L TERM wm LINE IN EQ GAIN AUDIO OUT Hi Z E VIDEO KRAMER TOOLS Video Audio Line Receiver Figure 8 712xl Video Audio Line Receiver Table 5 712xl Video Audio Line Receiver Features Feature Function 1 AUDIO RRCA Connector Connect to the right unbalanced stereo audio acceptor 2 OUT L RCA Connector Connect to the left unbalanced stereo audio acceptor 3 TERM Push Button When pressed terminates the unit that is the last in the line not looped 4 LINE IN6 pole Detachable Connect to the LINE OUT 6 pole detachable block Terminal Block Connect
10. cceptor for example a display 4 Connect an unbalanced stereo acceptor to the AUDIO OUT R and L RCA connectors for example speakers 5 Connect the LINE OUT 6 pole detachable terminal block connector of the 711xI to the LINE IN 6 pole detachable terminal connector of the 712xl via twisted pair cabling maximum range of up to 1000ft 300m 6 On each 711xl 712xl unit connect a 12V DC power adapter to the power socket and connect the adapter to the mains electricity 7 On the 712xl if required adjust the VIDEO GAIN and EQ levels by inserting a screwdriver into each of the small holes and carefully rotating them 1 See Table 6 for pinout If you want to add an additional 712x1 unit connect the LINE IN 6 pole detachable terminal block connector to the LINE IN connector of that additional 712x1 by attaching another set of wires 2 A straight connection should be made between the units PIN 1 to PIN 1 PIN 2 to PIN 2 and so on 14 KRAMER SIMPLE CREATIVE TECHNOLOGY The 711xl and 712x1 Video Audio Line Transmitter and Receiver as Composite Video Source Figure 9 Connecting the Video Audio Line Transmitter Receiver System 15 Technical Specifications 7 Technical Specifications Table 7 includes the technical specifications of the TP 1xl and the TP 2xl Table 8 includes the technical specifications of the 708 and Table 9 includes the technical specifications of the 711xl and the 712x
11. d Inverts the incoming video signal 7 LOOP RJ 11 Connector Connect to the LINE IN terminal block of an additional receiver to increase the number of outputs 8 LINE IN RJ 11 Connector Connect to the line out connector of the transmitter 9 ON LED Lights when receiving power 10 12V DC 12V DC connector for powering the unit 1 Insert a screwdriver into the hole and carefully rotate it to trim the level The 708 Video Audio Line Receiver 5 3 Connecting the 708 Video Audio Line Receiver To connect the 708 as illustrated in the example in Figure 6 do the following 1 Connect the VIDEO OUT BNC connector to a composite video acceptor for example a display Connect the AUDIO OUT RCA connector to an unbalanced mono audio acceptor for example an amplifier with speakers Connect a transmitter to the LINE IN RJ 11 connector If required connect the LOOP RJ 11 connector to the LINE IN RJ 11 connector of an additional 708 unit Connect a 12V DC power adapter to the power socket and connect the adapter to the mains electricity If required adjust the EQ equalization and VIDEO GAIN levels by inserting a screwdriver into each of the small holes and carefully rotating them From the Transmitter Figure 6 Connecting the 708 Video Audio Line Receiver KRAMER SIMPLE CREATIVE TECHNOLOGY The 711xl and 712x1 Video Audio Line Transmitter and Receiver 6 1 The 711xl and 712xl Video Audio Line Tran
12. duct loss of time commercial loss or 2 Any other damages whether incidental consequential or otherwise Some countries may not allow limitations on how long an implied warranty lasts and or do not allow the exclusion or limitation of incidental or consequential damages so the above limitations and exclusions may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from place to place NOTE All products returned to Kramer for service must have prior approval This may be obtained from your dealer This equipment has been tested to determine compliance with the requirements of EN 50081 Electromagnetic compatibility EMC generic emission standard Part 1 Residential commercial and light industry EN 50082 Electromagnetic compatibility EMC generic immunity standard Part 1 Residential commercial and light industry environment CFR 47 FCC Rules and Regulations Part 15 Radio frequency devices Subpart B Unintentional radiators CAUTION B Servicing the machines can only be done by an authorized Kramer technician Any user who makes changes or modifications to the unit without the expressed approval of the manufacturer will void user authority to operate the equipment B Use the supplied DC power supply to feed power to the machine B Please use recommended interconnection cables to connect the machine to other components 18 KRAMER SIMP
13. l Table 7 Technical Specifications of the TP 1xl and the TP 2xl TP 1xI TP 2xl INPUT 1 composite video 1Vpp 75Q ona 4 pin detachable terminal block BNC type connector OUTPUT 1 composite video 1Vpp 750 ona 4 pin detachable terminal block BNC type connector VIDEO BANDWIDTH 3dB 13MHz at 300 meters DIFF GAIN 2 20 meters CONTROL 0 9Deg 20 meters VIDEO S N RATIO 73dB 20 meters SYSTEM DELAY lt 1 microsecond TYP at 100 meters CONTROLS Gain 3dB to 4 4dB EQ 16dB to 9 9dB 4 4MHz POWER SOURCE 230 VAC 50 60Hz 115VAC U S A 4VA each DIMENSIONS 16 5cm x 12cm x 4 5cm 6 5 x 4 7 x 1 8 W D H WEIGHT 0 7kg 1 6lbs approx each ACCESSORIES Power cord each OPTIONS RK 50RN 19 rack adapter holds two units in one vertical rack space Table 8 Technical Specifications of the 708 INPUTS Looping balanced 1500 on a 6 4 standard telephone socket with termination switch and polarity inversion switch OUTPUTS 1 composite video 1Vpp 75Q composite video 1Vpp 75Q unbalanced on a BNC connector 1 audio line level up to 4 6Vpp 100Q on an RCA connector BANDWIDTH Video 58MHz audio 30kHz at 30 meters without lightening arrestors NON LINEARITY lt 0 2 at short distances DIFF GAIN 0 41 DIFF PHASE 0 3 Deg K FACTOR 0 1 20m S N RATIO 72dB
14. n the TP 2xl to increase the number of outputs by connecting additional receivers The TP 1xl and the TP 2x are housed in a desktop sized enclosure letting you rack mount two units side by side in a 1U rack space with the optional RK 50RN adapter 1 High Frequency The TP 1xl and TP 2x1 Video Line Transmitter and Receiver 4 2 Your TP 1xl Video Line Transmitter Figure 1 and Table 1 define the TP 1xl Video Line Transmitter LINE out Figure 1 TP 1xl Video Line Transmitter Table 1 TP 1xl Video Line Transmitter Features Feature Function 1 POWER Switch Illuminated switch for turning the unit ON or OFF 2 CV IN BNC Connector Connect to the composite video source 3 COMP GAIN Trimmer Turn to adjust the output signal level 4 HF Trimmer Turn to adjust the output signal equalization 5 LINE OUT Terminal Block Connect to the LINE IN terminal block on the TP 2xl 6 Power Connector with Fuse AC connector enabling power supply to the unit 1 Insert a screwdriver into the hole and carefully rotate it to trim the level 2 The second and third blocks marked and video and video respectively 4 KRAMER SIMPLE CREATIVE TECHNOLOGY The TP 1xl and TP 2x1 Video Line Transmitter and Receiver 4 3 Your TP 2xl Video Line Receiver Figure 2 and Table 2 define the TP 2xl Video Line Receiver IN LOOP t Figure 2 TP 2xl Video Line Receiver Table
15. or connector of the 711xlI see section 6 4 for pin out 5 VIDEO EQ Trimmer Turn to adjust the output signal equalization 6 GAIN Trimmer Turn to adjust the output signal level 7 VIDEO OUT BNC Connector Connect to the composite video acceptor 8 ON LED Lights when receiving power 9 12V DC 12V DC connector for powering the unit 1 Insert a screwdriver into the hole and carefully rotate it to trim the level 13 The 711xl and 712x1 Video Audio Line Transmitter and Receiver 6 4 The 6 pole Detachable Terminal Block Connector Pinout Table 6 defines the LINE IN and LINE OUT connector pinout Table 6 711xl 712xl LINE IN and LINE OUT Connector Pinout PIN Function Audio R Audio R Audio L Audio L Video Video oona WIN 6 5 Connecting the 711xI and the 712xl You can use the 711xl and 712xl to configure a Video Audio Transmitter and Receiver system To connect the 711xl Video Audio Line Transmitter with the 712xl Video Audio Line Receiver as illustrated in the example in Figure 9 do the following 1 Connect a composite video source for example a composite video player to the VIDEO IN BNC connector on the 711xl 2 Connect an unbalanced stereo source to the AUDIO IN RIGHT and LEFT RCA connectors for example a composite video player 3 On the 712xl connect the VIDEO OUT BNC connector to a composite video a
16. ries used in conjunction with the product WHAT WE WILL PAY FOR AND WHAT WE WILL NOT PAY FOR We will pay labor and material expenses for covered items We will not pay for the following 1 Removal or installations charges 2 Costs of initial technical adjustments set up including adjustment of user controls or programming These costs are the responsibility of the Kramer dealer from whom the product was purchased 3 Shipping charges HOW YOU CAN GET WARRANTY SERVICE 1 To obtain service on you product you must take or ship it prepaid to any authorized Kramer service center 2 Whenever warranty service is required the original dated invoice or a copy must be presented as proof of warranty coverage and should be included in any shipment of the product Please also include in any mailing a contact name company address and a description of the problem s 3 For the name of the nearest Kramer authorized service center consult your authorized dealer LIMITATION OF IMPLIED WARRANTIES All implied warranties including warranties of merchantability and fitness for a particular purpose are limited in duration to the length of this warranty EXCLUSION OF DAMAGES The liability of Kramer for any effective products is limited to the repair or replacement of the product at our option Kramer shall not be liable for 1 Damage to other property caused by defects in this product damages based upon inconvenience loss of use of the pro
17. smitter and Receiver This section e Overviews the 711xl and 712xl see section 6 1 e Defines your 711xl see section 6 2 e Defines your 712xl see section 6 3 e Defines the 6 pole detachable terminal block connector pinout see section 6 4 e Describes how to connect the 711xI 712xl Video Audio Line Transmitter Receiver see section 6 5 An Overview of the 711xl 712xl The 711xl and 712xl are a twisted pair transmitter and receiver for composite video and unbalanced stereo audio signals The 711xl transmitter converts composite video and stereo audio to a twisted pair signal and the 712xl receiver converts the twisted pair signal back into composite video and stereo audio signals The 711x1 712xl feature e A bandwidth of 45MHz e Twisted pair inputs and outputs on terminal block connectors e A system range of up to 300 meters 1000 feet e Level GAIN and equalization EQ controls for the 712xl In addition the 712xl LINE IN can be looped to add additional outputs and includes a selectable input signal termination push button The 711x1 712xl are part of the Kramer TOOLS family of compact high quality and cost effective solutions and are fed from an external 12V DC source making them suitable for field operation 11 The 711xl and 712x1 Video Audio Line Transmitter and Receiver 6 2 Your 711xl Video Audio Line Transmitter Figure 7 and Table 4 define the 711xl RIGHT LEFT AUDIO IN LINE OUT VIDE
18. telephone wiring e Simple and quick studio wiring The 708 the 711xl and the 712xl are ideal for e Remote monitoring for CCTV medical school and broadcast applications e Existing facilities with TP cable already installed e Teleconferencing in offices and hospitals using existing intercom or telephone wiring The package includes one or more of the following Kramer products e TP ixl TP 2xl 708 711xl or 712xl e Power adapter 12V DC Input and this user manual 2 Getting Started We recommend that you e Unpack the equipment carefully and save the original box and packaging materials for possible future shipment e Review the contents of this user manual e Use Kramer high performance high resolution cables 1 GROUP 1 Distribution Amplifiers GROUP 2 Video and Audio Switchers Matrix Switchers and Controllers GROUP 3 Video Audio VGA XGA Processors GROUP 4 Interfaces and Sync Processors GROUP 5 Twisted Pair Interfaces GROUP 6 Accessories and Rack Adapters GROUP 7 Scan Converters and Scalers and GROUP 8 Cables and Connectors 2 Download up to date Kramer user manuals from the Internet at this URL http www kramerelectronics com 3 The complete list of Kramer cables is on our Web site at http www kramerelectronics com 1 Overview 3 Overview This manual describes the e The TP 1xl Video Line Transmitter and the TP 2xl Video Line Receiver see section 4 e The 708 Video Audio Line Receiver
19. ting the Video Audio Line Transmitter Receiver System Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 TP 1xl Video Line Transmitter Features TP 2xl Video Line Receiver Features 708 Video Audio Line Receiver Features 711xl Video Audio Line Transmitter Features 712xl Video Audio Line Receiver Features 711x1 712x1 LINE IN and LINE OUT Connector Pinout Technical Specifications of the TP 1xl and the TP 2xl Technical Specifications of the 708 Technical Specifications of the 711x1 and the 712xl ODF NDNPWW NR SSS SS BPWNr FS O 16 12 13 14 16 16 17 Introduction 1 Introduction Welcome to Kramer Electronics since 1981 a world of unique creative and affordable solutions to the infinite range of problems that confront the video audio and presentation professional on a daily basis In recent years we have redesigned and upgraded most of our line making the best even better Our 500 plus different models now appear in 8 Groups which are clearly defined by function Congratulations on purchasing your Kramer TP 1xl Video Line Transmitter and or TP 2xl Video Line Receiver and or 708 Video Audio Line Receiver and or 711xl Video Audio Line Transmitter and or 712xl Video Audio Line Receiver The TP 1xl and the TP 2x are ideal for e Simplifications of security and CCTV installations e Teleconferencing in offices and hospitals using existing intercom or
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