RF Solutions

RF System 868 MHz

RF System 868 MHz Contents Technology Highlights System Features & Installation Overview of Product Range

Technology Highlights 868 MHz Operating Band Quality Components Superior Receiver Technology Advanced encoding algorithms There are a number of elements which affect the performance of an RF system. This includes; - Selection of the operating band; there are some clear benefits of operating in the 868 MHz frequency the quality of the frequency determining components because if the system is unable to generate an accurate transmission guaranteed over a period of time and varying temperatures, the receiver will miss the incoming signals. In general, the higher the frequency, the more challenging this becomes. - Receiver technology; factors such as method of signal processing, channel band and antenna diversity.. - Advanced encoding algorithms; the way in which the messages from the transmitter to the receiver are encoded and decoded to ensure a safe and accurate journey

Technology Highlights 868 MHz Operating Band Dedicated slot within the 868 MHz Operating Band reserved for security systems Limited part is allowed for transmission There is a dedicated slot within the 868 MHz band which is reserved for the use of security systems so the chances of interference from other devices are dramatically reduced Moreover, the regulations insist that only 0.1% of the bandwidth can be used for a transmission at any one time which means that 99.9% of the band is available for other signals which are trying to get through In other words, the chances of success of a transmission of an alarm signal are significantly increased so that on the whole systems operating in this band can be considered more reliable.

SRD Applications in 868MHz band

Technology Highlights Quality Components Crystal Based PLL Circuits Precise Transmitter Frequency Precise Receiver Frequency Excellent long-term reliability Changing temperature, battery voltage and age causes the frequency generated by the components to drift which means that the chances of the receivers ability to pick up the signals within its defined operating band are reduced. The higher the frequency, the more challenging this becomes and we need to be able to offer a system which has a lifetime of around 10 years. The components used in the 868 system use a mechanism known as Phase Lock Loop (PLL) which locks the polling signal of the transmitter onto the receiver. Excellent long term frequency stability is achieved by aging components by putting them into environmental test chambers which accelerates their maturity and therefore more stable

Technology Highlights Superior Receiver Technology Diversity receiver using twin antennae Improved Signal Capture in a multi-path environment Signal Nulls and Voids Reduced Spatial Diverse Direct Conversion Narrow Band Channel Spacing Diversity receiver using twin antennae; Simply put, the receiver has two antennae. It switches constantly and rapidly (50 x second) between the two antennae (unless it recognises its own signal which it would lock onto to). - A diversity receiver improves signal capture in a multi-path environment because field strength cannot be predicted with changes in environment. - Spatial diverse; the antennae are optimally placed to capture maximum signal strength - Direct conversion; state-of the art receiver technology which comes from the pager industry. It provides reliable reception because the signal received is pure (not mixed) and is only sensitive at its operating frequency - Narrow Band Channel Spacing; the receiver only uses 8 KHz bandwidth so the chances of interference are very low

Technology Highlights Advanced encoding algorithms Packetized Manchester Encoded Information Frequency Shift Keyed (FSK) transmissions High Message Integrity Unique Address Each data packet has its own checksum Anti-Collision Algorithm Fewer Missed Messages Packetized Manchester Encoded Information; FSK is the modulation method used for Manchester encoding -High Message Integrity; this encoding method includes exactly the same number of high and low frequencies which means that the centre-point of the transmitting signal never changes because it takes an average of the frequencies. The receiver is constantly scanning 4 KHz either side of the 868.63750 range and as soon as it picks up a signal it will shift its centre-point to fit with the transmitter - Unique Address; Each address is unique - more than 1 million combinations available (20 bit address). In addition, the data packet tells the receiver which type of device it is so devices could have the same address but a are a different type which further increases the number of possible different combinations - Each data packet has a checksum included in it which means that it verifies the sum of data Anti-Collision Algorithm; Between each data packet, there is a space which helps to avoid messages colliding with each other and cancelling each other out

Packet Build-Up Message 1 CRC 1 Message 2 CRC 2 Pre-amble Sync ‘Head’ Sync ‘Tail’

System Features System Features More than 3 Years Battery Life Standard Consumer Batteries Patented Learn - ModeTM Technology Signal Strength Test Special antennae Via keypad Proven Detector technology - More than 3 years battery life. - Standard Consumer Batteries; uses DL123A Lithium 3 V - Learn-Mode Technology; Patented Learn-Mode Technology increases the ease and reliability of installations. Each device in a system has its own factory-programmed identity so the receiver simply ‘learns’ the identity of each device by creating a tamper. This dramatically reduces installation time and eliminates programming errors in the field - Signal Strength Test - Special antennae kit; if you install the short antennae, receiver sensitivity is reduced by 4 db which guarantees sufficient signal strength in normal operation - Via keypad; RSSI receiver signal strength indicator = during programming - Proven Detector technology; in-house technology - Aritech mirror-based PIR’s, ESL smoke detectors and Sentrol Magnetic Contacts

System Features System Features cont’d Low battery dynamic battery test Alarm Tamper Restore (smoke & door/window only) Supervision Jamming detection - Low Battery dynamic battery test; is tested during the active time of power transmission sent with any message - Alarm & Tamper; Tx is asleep for 250 ms most but wakes up for 25 ms (after 250 ms) and checks for alarm and tamper and if no change of state it goes back to sleep. - Supervision message is sent every 15 minutes (within) from last transmission (such as an alarm), Receiver has time programmable windows, looks to receive polled signal every 15 mins (and holds in memory so cannot arm if missed a signal) Jamming Indication; Jamming detection algorithm according to EN50131 regulations which means that jamming condition occurs if you have more than 30 seconds of jamming within any one minute (does not have to be continuous). The receiver passes messages on to control panel as a separate message. The jamming condition is cancelled if any learned in transmission whatsoever is received to reduce false alarms

Field Proven

Field Proven Proven RF technology March 1 >220,000 hours of RF field experience Tested in RF Hot Spots, including: BT Building, London NOKIA Building, London (close to London Heathrow) Eiffel Tower, Paris

Product Range Compatible with CS175/CS275/ CS575 control panels RF Gateway (receiver) Connects directly to 3-wire CS Data Bus Can be installed in deluxe control panel housing or remotely in separate housing Door/Window Detector PIR Smoke Detector

RF300W8 Door/Window Detector Typical battery life 3 years Provided with a magnet for protecting windows Can be connected to additional devices

RF425 PIR Typical battery life 3 years Typical range free air 400 m Volumetric Coverage 9 x 16 m Next generation ASIC with ‘4D’ processing providing improved detection & false alarm immunity Precision ‘Gliding focus curtain’ True-range control (Autofocus) for stable performance in all rooms

RF572 Smoke Detector 3 year battery life Pry-off tamper Field-exchangeable & disposable optical chamber Floating background with drift compensation Automatic self-diagnostics Dynamic full detector test Sensitivity test Manual self-diagnostics Provides ‘Clean-Me®’(1) signal which indicates that the detector requires servicing (1) Signal cannot be processed by panel