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Features
VideoWave Digital & IP systems are based on the 802.11a WLAN technology, especially adapted for transmitting video and telemetry in the 5.5GHz to 5.7GHz license free band. (see note at the end of this data sheet). The system is flexible, offering various configurations from simple point to point, to multiple camera applications, with telemetry for full PTZ control included as standard. The key feature of the RDT system, is the ease of use, with simple set-up procedures which require no specialist networking knowledge.
IP System overviewThe IP system consists of Transmitters (slaves) and Receivers (masters) that have been developed specifically for transmitting video, although of course they can be used for any standard data network. They can be configured for single camera point-to-point operation, or for multi-camera networks. The units are all housed in IP67 weatherproof enclosures, ideal for external mounting to suit most applications.The VTX4056E (Transmitter) and VRX4056E (Receiver) are housed in an enclosure with an RF connector for the antenna connection. This allows for various external antennas to be used, depending on the application, location of equipment, coverage distance required etc. If the unit is a receiver for example, which is receiving signals from a number of transmitters, it may be necessary to fit an omni-directional dipole antenna. The VTX4056A and VRX4056A are supplied with a built-in 20dB panel antenna. This is an ideal single box solution for point-to-point applications. In a Multi-camera system, the VTX4056A may be used for the transmitters, with the antennas directed towards the receiver, but the receiver may need to be a VRX4056E, with an external omni-directional antenna. There is also the option of a VTX4056A-4, which has a built-in router providing four RJ45 Ethernet inputs. This allows for up to four IP cameras to be connected to a single transmitter. A separate 5 port router (VRM4300E) is available to allow connection of up to 4 cameras to a VTX4056E or VTX4056A if required. The RDT router is supplied in an IP67 weatherproof enclosure with integral mains power supply for easy installation. All the units have weatherproof cable glands for data and power connections and require a 12V dc power supply. Connection is by screw-less spring terminal block, which avoids making up RJ45 cables on site. The units are also supplied with brackets suitable for mounting on a standard 50mm pole.
Example system configurations with IP cameras 
Top of page VideoWave Digital System overviewThe VideoWave digital system, uses the same transmission network as described above. With the addition of the H.264 video encoder (VIM4100E), standard analogue cameras can be used. The encoder has a BNC connector for the video input from the camera. The signal is encoded and compressed using the latest very efficient H.264 encoding algorithms, ready for onward transmission.At the receiving end, a video decoder (VOM4200E) decompresses the signal, outputting standard 1V p-p composite video. This signal can be connected to a DVR, matrix switch or monitor in the normal way, offering a solution similar to a standard analogue system. Other cameras in the system may be standard hard-wired units, offering a complete integrated solution. The advantage over IP systems is the ability to connect to standard analogue equipment at the control centre, making system integration and control operations much simpler. The encoder and decoder are available as stand alone units, or integrated with a transmitter and antenna in a single unit. The VIM4100E encoder is designed to connect to the transmitter, VTX4056E or VTX4056A or up to 4 may be connected to a VTX4056A-4. A separate, mains-powered, 5 port router (VRM4300E) may be used instead to connect up to 4 VIM4100E encoders to a transmitter (or 4 decoders VOM4200E to a receiver). Routers can be cascaded together for larger systems. Alternatively, the VTX4056VA has a transmitter, antenna and encoder in a single unit. This offers a simple one box solution for a single camera location. Similarly, the VOM4200E decoder connects to the receivers, VRX4056E, VRX4056A or again, up to 4 units may be connected to a VRX4056A-4. The VRX4056VA has a transmitter, antenna and decoder in a single unit. Connection from the stand alone encoder / decoder to the transmitter / receiver is by standard CAT-5 cable. The encoder and decoder are mains powered and can provide the 12V dc to power the TX or RX units, if required. The integrated units require a 12V dc supply. Top of page TelemetryBoth the VIM and VOM are provided with a RS485 connection to enable PTZ control. This provides a transparent link that will support most of the major telemetry protocols. The RS485 can be wired in a multi-drop configuration for systems with multiple PTZ cameras.AlarmsBoth units are also provided with 2 digital inputs and 2 digital outputs. Input D1 and D2 on a VIM will switch outputs D1 and D2 on the corresponding VOM and visa-versa. The inputs are opto-isolated volt free contacts. The outputs are a pair of normally open relay contacts that can switch up to 1A at 30V dc or 0.25A at 250V ac.Two-way audioIf the audio option is specified, the system can provide high quality two-way audio with the addition of external amplifiers. There are three programming options providing one-way audio from camera to controller, one-way audio from controller to camera or full two-way audio. Note if two-way audio is used, it my be necessary to fit a PTT switch to stop positive feedback (howl-round).The input on both the VIM and VOM is unbalanced, high impedance, 0 to 2.5V p-p. Any microphone pre-amplifier or an auxiliary output from an amplifier can be connected to this input. Some microphone amplifiers have outputs higher than 2.5V, which may result in audio distortion. The output of both the VIM and VOM is unbalanced, high impedance (> 10K ohm), 2.5V p-p. The output level tracks the level of the microphone input. This output should be connected to the auxiliary input of a suitable external amplifier. Example system configurations with analogue cameras 
Top of page VideoWave AntennasThese antennas are used with VTX / VRX 4056E versions.
Notes: The ranges quoted are based on clear line-of-sight. See http://www.radiodata.co.uk/tech/los.htm *The units with an integral 20dB antenna have a range of 20km **ANT5608-CAB the quoted 6Km range assumes a 20dB antenna at the transmitter Attention Frequency use in the 5GHz band The 5GHz band is divided into 3 separate bands that can be used for wireless LANs and transmitting video data, but there are restrictions: Band A 5150 to 5350MHz This part of the band is for indoor use only i.e. low power Local Area Networks Band B 5470 to 5725MHz This band may be used for Wide Area Networks, and outdoor use is permitted. Band C 5725 to 5850MHz This band allows higher power but can only be used if a license is obtained from OFCOM. Note: The RDT equipment is capable of operating in all 3 bands, however, because of the restrictions outlined above, as standard they are programmed to operate in band B only. We can programme to band A or C if required for special applications or where the customer has obtained an operating license.
Top of page Contact RADIO DATA TECHNOLOGY LIMITED for: |
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