title stringlengths 1 105 | content stringlengths 5 58.1k |
|---|---|
Pretty Good Privacy | time cryptosystems using keys larger bits considered munitions within definition us export regulations pgp never used keys smaller bits qualified time.penalties violation found guilty substantial.several years investigation zimmermann closed without filing criminal charges anyone else.zimmermann challenged regulations ... |
Pretty Good Privacy | one could build application using freely available gnu compiler collection.pgp would thus available anywhere world.claimed principle simple export munitions—guns bombs planes software—was remains restricted export books protected first amendment.question never tested court respect pgp.cases addressing encryption softwa... |
Pretty Good Privacy | pgp encryption longer meets definition nonexportable weapon exported internationally except seven specific countries list named groups individuals substantially us trade prohibited various us export controls.pgp founding pgp inc. turmoil zimmermanns team worked new version pgp encryption called pgp .new version conside... |
Pretty Good Privacy | cast symmetric key algorithm dsa elgamal asymmetric key algorithms unencumbered patents.after federal criminal investigation ended zimmermann team started company produce new versions pgp encryption.merged viacrypt zimmermann sold commercial rights licensed rsa directly rsadsi changed name pgp incorporated.newly combin... |
Pretty Good Privacy | viacrypt thus created new version based pgp called pgp .remove confusion could pgp successor pgp pgp renamed released pgp may .network associates acquisition december pgp inc. acquired network associates inc. nai.zimmermann pgp team became nai employees.nai first company legal export strategy publishing source code. |
Pretty Good Privacy | nai pgp team added disk encryption desktop firewalls intrusion detection ipsec vpns pgp family.export regulation liberalizations longer required publishing source nai stopped releasing source code.in early zimmermann left nai.served chief cryptographer hush communications provide openpgpbased email service hushmail.als... |
Pretty Good Privacy | remaining asset kept pgp ebusiness server original pgp commandline version.february nai canceled support pgp products exception renamed commandline product.nai formerly mcafee intel security mcafee continued sell support product name mcafee ebusiness server .pgp corporation symantec august several expgp team members fo... |
Pretty Good Privacy | pgp corporation supported existing pgp users honored nais support contracts.zimmermann served special advisor consultant pgp corporation continuing run consulting company.pgp corporation created new serverbased product called pgp universal.mid pgp corporation shipped command line version called pgp command line integra... |
Pretty Good Privacy | pgp corporation acquired hamburgbased certificate authority tc trustcenter parent company chosensecurity form pgp trustcenter division.after purchase nais pgp assets pgp corporation offered worldwide pgp technical support offices draper utah offenbach germany tokyo japan.on april symantec corp. announced would acquire ... |
Pretty Good Privacy | townsend security ported pgp time ibm z mainframe.version pgp relies free zos encryption facility utilizes hardware acceleration.software diversified services also offers commercial version pgp sds ebusiness server ibm z mainframe.in may bug named efail discovered certain implementations pgp could reveal plaintext cont... |
Pretty Good Privacy | information programs compatible openpgp specification see external links below.while originally used primarily encrypting contents email messages attachments desktop client pgp products diversified since set encryption applications managed optional central policy server.pgp encryption applications include emails attach... |
Pretty Good Privacy | capabilities licensed different ways depending features required.the pgp universal server .x management console handles centralized deployment security policy policy enforcement key management reporting.used automated email encryption gateway manages pgp desktop .x clients.addition local keyserver pgp universal server ... |
Pretty Good Privacy | desktop server operations based security policies operate automated fashion.pgp universal server automates creation management expiration keys sharing keys among pgp encryption applications.the symantec pgp platform undergone rename.pgp desktop known symantec encryption desktop sed pgp universal server known symantec e... |
Pretty Good Privacy | rsadsi challenging continuation viacrypt rsa license newly merged firm.company adopted informal internal standard called unencumbered pgp would use algorithm licensing difficulties.pgp encryptions importance worldwide many wanted write software would interoperate pgp .zimmermann became convinced open standard pgp encry... |
Pretty Good Privacy | gave ietf permission use name openpgp describe new standard well program supported standard.ietf accepted proposal started openpgp working group.openpgp internet standards track active development.many email clients provide openpgpcompliant email security described rfc .current specification rfc november successor rfc ... |
Pretty Good Privacy | addition algorithms standard recommends rsa described pkcs v. encryption signing well aes cast idea.beyond many algorithms supported.standard extended support camellia cipher rfc signing key exchange based elliptic curve cryptography ecc i.e.ecdsa ecdh rfc .support ecc encryption added proposed rfc bis .the free softwa... |
Pretty Good Privacy | several vendors also developed openpgpcompliant software.the development open source openpgpcompliant library openpgp.js written javascript supported horizon framework programme european union allowed webbased applications use pgp encryption web browser.pgprfc pgp message exchange formats obsoleteopenpgprfc openpgp mes... |
Pretty Good Privacy | many published pgp keys found susceptible.yubico offers free replacement affected tokens.see also references reading garfinkel simson .pgp pretty good privacy.oreilly associates. |
Pretty Good Privacy | isbn .levy steven january .crypto code rebels beat government—saving privacy digital age.penguin books.isbn .lucas michael w. april .pgp gpg email practical paranoid. |
Pretty Good Privacy | starch press.isbn .zimmermann phil june .wrote pgp.retrieved march .external links openpgpsdkmit public key directory registration searchlist public keyserversietf openpgp working groupopenpgp alliance |
Zigbee | hence zigbee lowpower low data rate close proximity i.e.personal area wireless ad hoc network.the technology defined zigbee specification intended simpler less expensive wireless personal area networks wpans bluetooth general wireless networking wifi.applications include wireless light switches home energy monitors tra... |
Zigbee | zigbee networks secured bit symmetric encryption keys.zigbee defined rate kbits best suited intermittent data transmissions sensor input device.zigbee conceived standardized revised .name refers waggle dance honey bees return beehive.overview zigbee lowcost lowpower wireless mesh network standard targeted batterypowere... |
Zigbee | zigbee chips typically integrated radios microcontrollers.zigbee operates industrial scientific medical ism radio bands .ghz jurisdictions worldwide though devices also use mhz china mhz europe mhz us australia however even regions countries still use .ghz commercial zigbee devices home use.data rates vary kbits mhz ba... |
Zigbee | ghz band.zigbee builds physical layer media access control defined ieee standard .. lowrate wireless personal area networks wpans.specification includes four additional key components network layer application layer zigbee device objects zdos manufacturerdefined application objects.zdos responsible tasks including keep... |
Zigbee | trees meshes allow use zigbee routers extend communication network level.another defining feature zigbee facilities carrying secure communications protecting establishment transport cryptographic keys ciphering frames controlling device.builds basic security framework defined ieee ... history zigbeestyle selforganizing... |
Zigbee | cluster library september zigbee specification announced obsoleting stack specification replaces message key–value pair structure used stack cluster library.library set standardised commands attributes global artifacts organised groups known clusters names smart energy home automation zigbee light link.in january zigbe... |
Zigbee | zigbee pro device may join operate legacy zigbee network vice versa.due differences routing options zigbee pro devices must become nonrouting zigbee end devices zeds legacy zigbee network legacy zigbee devices must become zeds zigbee pro network.operates using .ghz ism band adds subghz band.use cases zigbee protocols i... |
Zigbee | resulting network use little power—individual devices must battery life least two years pass certification.typical application areas includehome automationwireless sensor networksindustrial control systemsembedded sensingmedical data collectionsmoke intruder warningbuilding automationremote wireless microphone configur... |
Zigbee | enhancement zigbee smart energy version specifications.adds services plugin electric vehicle charging installation configuration firmware download prepay services user information messaging load control demand response common information application profile interfaces wired wireless networks.developed partners includin... |
Zigbee | zigbee rfce specification uses subset zigbee functionality allowing run smaller memory configurations lowercost devices remote control consumer electronics.radio hardware radio design used zigbee analog stages uses digital circuits wherever possible.products integrate radio microcontroller single module available.the z... |
Zigbee | uncertified physical layer malfunctions increase power consumption devices zigbee network.thus radios tested guidance given clause .. standard.this standard specifies operation unlicensed ..ghz worldwide mhz americas australia .mhz europe ism bands. |
Zigbee | sixteen channels allocated .ghz band spaced mhz apart though using mhz bandwidth each.radios use directsequence spread spectrum coding managed digital stream modulator.binary phaseshift keying bpsk used mhz bands offset quadrature phaseshift keying oqpsk transmits two bits per symbol used .ghz band.the raw overtheair d... |
Zigbee | ghz band kbits per channel mhz band kbits mhz band.actual data throughput less maximum specified bit rate due packet overhead processing delays.indoor applications .ghz transmission distance – depending construction materials number walls penetrated output power permitted geographical location.output power radios gener... |
Zigbee | device types operating modes three classes zigbee deviceszigbee coordinator zc capable device coordinator forms root network tree may bridge networks.precisely one zigbee coordinator network since device started network originally zigbee lightlink specification also allows operation without zigbee coordinator making us... |
Zigbee | nonbeaconenabled networks unslotted csmaca channel access mechanism used.type network zigbee routers typically receivers continuously active requiring additional power.however allows heterogeneous networks devices receive continuously others transmit necessary.typical example heterogeneous network wireless light switch... |
Zigbee | network lamp node least zigbee router zigbee coordinator switch node typically zigbee end device.beaconenabled networks zigbee routers transmit periodic beacons confirm presence network nodes.nodes may sleep beacons thus extending battery life.beacon intervals depend data rate may range .milliseconds . |
Zigbee | seconds kbits milliseconds .seconds kbits milliseconds .seconds kbits.long beacon intervals require precise timing expensive implement lowcost products.in general zigbee protocols minimize time radio reduce power use.beaconing networks nodes need active beacon transmitted. |
Zigbee | nonbeaconenabled networks power consumption decidedly asymmetrical devices always active others spend time sleeping.except smart energy profile .zigbee devices required conform ieee .. lowrate wireless personal area network lrwpan standard.standard specifies lower protocol layers—the physical layer phy media access con... |
Zigbee | csmaca used three notable exceptions message acknowledgmentsbeacons sent fixedtiming schedule.devices beaconenabled networks lowlatency realtime requirements may also use guaranteed time slots.network layer main functions network layer ensure correct use mac sublayer provide suitable interface use next upper layer name... |
Zigbee | control entity handles configuration new devices establishes new networks.determine whether neighboring device belongs network discovers new neighbors routers.the routing protocol used network layer aodv.find destination device aodv used broadcast route request neighbors.neighbors broadcast request neighbors onward des... |
Zigbee | source receives reply updates routing table destination address next hop path associated path cost.application layer application layer highestlevel layer defined specification effective interface zigbee system end users.comprises majority components added zigbee specification zdo zigbee device object management procedu... |
Zigbee | main components zdo zigbee device object protocol zigbee protocol stack responsible overall device management security keys policies.responsible defining role device either coordinator end device mentioned also discovery new devices network identification offered services.may go establish secure links external devices ... |
Zigbee | communication models application may consist communicating objects cooperate carry desired tasks.tasks typically largely local device instance control household appliance.focus zigbee distribute work among many different devices reside within individual zigbee nodes turn form network.the objects form network communicat... |
Zigbee | enables description request modification object attribute simple interface based get set event primitives allowing request response.configuration uses xml.the message service designed offer general approach information treatment avoiding necessity adapt application protocols potential overhead incurred kvp.allows arbit... |
Zigbee | communication device discovery applications communicate devices support must use common application protocol types messages formats sets conventions grouped profiles.furthermore binding decided upon matching input output cluster identifiers unique within context given profile associated incoming outgoing data flow devi... |
Zigbee | end devices simply respond requested address network coordinator router also send addresses devices associated it.this extended discovery protocol permits external devices find devices network services offer endpoints report queried discovering device previously obtained addresses.matching services also used.the use cl... |
Zigbee | indirect addressing particularly useful keep devices simple minimize need storage.besides two methods broadcast endpoints device available group addressing used communicate groups endpoints belonging set devices.security services one defining features zigbee provides facilities carrying secure communications protecting... |
Zigbee | trust must assumed initial installation keys well processing security information.implementation globally work general conformance specified behaviors assumed.keys cornerstone security architecture protection paramount importance keys never supposed transported insecure channel.momentary exception rule occurs initial p... |
Zigbee | open trust model within device allows key sharing notably decreases potential cost.nevertheless layer creates frame responsible security.malicious devices may exist every network layer payload must ciphered unauthorized traffic immediately cut off.exception transmission network key confers unified security layer grid n... |
Zigbee | key associated either network usable zigbee layers mac sublayer link acquired preinstallation agreement transport.establishment link keys based master key controls link key correspondence.ultimately least initial master key must obtained secure medium transport preinstallation security whole network depends it.link mas... |
Zigbee | secure network designate one special device devices trust distribution security keys trust center.ideally devices center trust address initial master key preloaded momentary vulnerability allowed sent described above.typical applications without special security needs use network key provided trust center initially ins... |
Zigbee | rule security level use specified upper layers.the network layer manages routing processing received messages capable broadcasting requests.outgoing frames use adequate link key according routing available otherwise network key used protect payload external devices.the application layer offers key establishment transpo... |
Security alarm | way users determine validity new algorithms hardware implementation.see also comparison .. radio modulescomparison wireless data standardsconnected home ipmobile ad hoc networksthread references external links official websitesecurity alarms used residential commercial industrial military properties protect burglary th... |
Security alarm | many types security systems.homeowners typically small selfcontained noisemakers.devices also complicated multirole systems computer monitoring control.may even include twoway voice allows communication panel monitoring station.design basic alarm consists least one sensor detect trespassers alerting device indicate int... |
Security alarm | however typical premises security alarm employs following componentspremises control unit pcu alarm control panel acp simply panel brain system reads sensor inputs tracks armdisarm status signals intrusions.modern device typically one computer circuit boards inside metal enclosure.many newer networks often use sealed p... |
Security alarm | sensors detect intruders different methods.example sensors monitor doors windows openings monitor unoccupied interiors motions sound vibration disturbancesalerting devices indicate alarm condition.commonly bells sirens also flashing lights.alerting devices serve dual purposes warning occupants intrusion potentially sca... |
Security alarm | addition buttons keypads typically feature indicator lights small multicharacter display both.interconnections components.interconnections may consist direct wiring control unit wireless links local power supplies.in addition system security alarms often offer monitoring service.event alarm premises control unit contac... |
Security alarm | sensor types hermetically sealed reed switches hermetically sealed reed switch common type twopiece sensor.switch operates electrically conductive reed switch either normally open normally closed influence magnetic field respect proximity second piece contains magnet.magnet moves away reed switch reed switch either clo... |
Security alarm | passive infrared detectors passive infrared pir motion detector one common sensors found household small business environments.offers affordable reliable functionality.term passive refers fact detector generate radiate energy works entirely detecting heat energy given objects.strictly speaking pir sensors detect motion... |
Security alarm | pirs require power supply addition detection signaling circuit.infrasound detectors infrasound detector works detecting infrasound sound waves frequencies hertz.sounds frequencies inaudible human ear.due inherent properties infrasound travel distances many hundreds kilometers.infrasound signals result volcanic eruption... |
Security alarm | intruder breaks infrasound detector automatically catches sight intruders actionsthe purpose system detect burglars enter house avoid theft vandalism.sensitivity dependent size home presence animals.ultrasonic detectors active detectors transmit ultrasonic sound waves inaudible humans using frequencies khz khz.doppler ... |
Security alarm | solid objects surrounding floor walls ceiling reflect sound waves receiver detect.ultrasonic waves transmitted air hardsurfaced objects tend reflect ultrasonic energy soft surfaces tend absorb energy.when surfaces stationary frequency waves detected receiver equal transmitted frequency.however change frequency occur re... |
Security alarm | microwave detectors device emits microwaves transmitter detects reflected microwaves reduction beam intensity using receiver.transmitter receiver usually combined inside single housing monostatic indoor applications separate housings bistatic outdoor applications.reduce false alarms type detector usually combined passi... |
Security alarm | typically need sterile clearance area prevent partial blocking detection field.compact surveillance radar compact surveillance radar emits microwaves transmitter detects reflected microwaves.similar microwave detectors detect precise location intruders areas extending hundreds acres.capability measuring range angle vel... |
Security alarm | csr commonly used protect outside fence line critical facilities electrical substations power plants dams bridges.photoelectric beams photoelectric beam systems detect presence intruder transmitting invisible infrared light beams across area beams may obstructed.improve detection surface area beams often employed stack... |
Security alarm | systems available internal external applications.prevent clandestine attack using secondary light source used hold detector sealed condition whilst intruder passes systems use detect modulated light source.advantages low cost easy install.require little sterile clearance area operate disadvantages affected fog high lum... |
Security alarm | glassbreak detection glassbreak detector may used internal perimeter building protection.glassbreak acoustic detectors mounted close proximity glass panes listen sound frequencies associated glass breaking.seismic glassbreak detectors generally referred shock sensors different installed glass pane.glass breaks produces... |
Security alarm | breaking glass intents purposes ensured tear foil break circuit.smoke heat carbon monoxide detectors systems also equipped smoke heat andor carbon monoxide detectors.also known hour zones times.smoke heat detectors protect risk fire using different detection methods.carbon monoxide detectors help protect risk carbon mo... |
Security alarm | although intruder alarm panel may also detectors connected may meet local fire code requirements fire alarm system.traditional smoke detectors technically ionization smoke detectors create electric current two metal plates sound alarm disrupted smoke entering chamber.ionization smoke alarms quickly detect small amounts... |
Security alarm | smoke enters chamber scatters light hits sensor triggers alarm.photoelectric smoke detectors typically respond faster fire early smoldering stage – source fire bursts flames.motion sensors motion sensors devices use various forms technology detect movement.technology typically found motion sensors trigger alarm include... |
Security alarm | traditionally motion sensors integral part home security system.devices typically installed cover large area commonly cover ft. ° field vision.driveway alarms driveway alarm systems combined security automation systems.designed alert residents unexpected visitors intruders deliveries arriving property.come magnetic inf... |
Security alarm | driveway alarms also purchased hardwired wireless systems.common rural security systems well commercial applications.electromechanical shaker sensors electromechanical devices mounted barriers used primarily detect attack structure itself.technology relies unstable mechanical configuration forms part electrical circuit... |
Security alarm | medium transmitting vibration must correctly selected specific sensor best suited different types structures configurations.technology gradually replaced intelligent digital accelerometerbased systems.advantages lowcost easily installed existing fences.disadvantages must fencemounted.mechanical nature system unable ana... |
Security alarm | type sensor used detect intruders carrying substantial amounts metal firearm making ideally suited antipoaching applications.electrostatic field sometimes referred efield volumetric sensor uses electric field proximity sensing installed buildings perimeters fences walls.also ability installed freestanding dedicated pol... |
Security alarm | usually configured zones metre lengths.advantage highsecurity difficult defeat high vertical detection field.disadvantages expensive short zones mean electronics thus higher cost.microphonic systems microphonic systems vary design example timedomain reflectrometer piezoelectric generally based detection intruder attemp... |
Security alarm | systems adjustable electronics permit installers change sensitivity alarm detectors suit specific environmental conditions.tuning system usually accomplished commissioning detection devices.advantages relatively inexpensive compared systems easy install.disadvantage older systems may high rate false alarms caused wind ... |
Security alarm | systems designed detect physical attempt penetrate barrier.taut wire systems operate variety switches detectors sense movement end tense wires.switches detectors simple mechanical contact static force transducer electronic strain gauge.unwanted alarms caused birds animals avoided adjusting sensors ignore objects exert ... |
Security alarm | concrete footing directly fence installed prevent type attack.advantages low rate false alarms reliable sensors high rate detection.disadvantages expensive complicated install.fiber optic cable fiberoptic cable used detect intruders measuring difference amount light sent fiber core.variety fiber optic sensing technolog... |
Security alarm | allow cover large perimeters tens km.disadvantage typically performs manner similar microphonicbased systems higher cost complexity due use fiberoptic technology.ported coaxial cable system employs electromagnetic field disturbance principle based two unshielded leaky coaxial cables buried approximately cm ft. deep ft.... |
Security alarm | care must taken ensure surrounding soil offers good drainage order avoid nuisance alarms.advantage concealed buried form.disadvantages affected rf noise difficult install.security electric fence security electric fences consist wires carry pulses electric current provide nonlethal shock deter potential intruders.tamper... |
Security alarm | wired systems convenient sensors pirs smoke detectors etc.require external power operate correctly however may costly install.entrylevel wired systems utilize star network topology panel center logically devices home run line wires back panel.complex panels use bus network topology wire basically data loop around perim... |
Security alarm | biscuit.wired systems also advantage wired properly example dual loop tamperevident.wireless systems hand often use batterypowered transmitters easier install less expensive startup costs may fail batteries maintained.depending distance construction materials one wireless repeaters may required bring signal alarm panel... |
Security alarm | wireless monitoring alarm system protects burglar cutting cable failures internet provider.full wireless setup commonly referred wireless.hybrid systems use wired wireless sensors achieve benefits both.transmitters also connected premises electrical circuits transmit coded signals control unit line carrier.control unit... |
Security alarm | motorized bell electronic siren lights e.g.strobe light may useful signaling evacuation notice people fire alarms one hopes scare amateur burglar quickly.however widespread use alarm systems especially cars false alarms frequent many urbanites tend ignore alarms rather investigating let alone contacting necessary autho... |
Security alarm | highend systems connect central station first responder e.g.policefiremedical via direct phone wire cellular network radio network i.e.gprsgsm ip path.case dual signaling system two options utilized simultaneously.alarm monitoring includes sensors also communication transmitter itself. |
Security alarm | direct phone circuits still available areas phone companies high cost advent dual signaling comparatively lower cost becoming uncommon.direct connections usually seen federal state local government buildings school campus dedicated security police fire emergency medical department uk communication possible alarm receiv... |
Security alarm | example heat sensor alarm coupled flame detector area reliable indication actual fire one sensor indication itself.many alarm panels equipped backup communication path use primary pstn circuit functioning.redundant dialer may connected second communication path specialized encoded cellular phone radio internet interfac... |
Security alarm | possible use wireless cellular radio device primary communication method.in uk popular solution kind similar principle primary back paths reversed.utilizing radio path gprsgsm primary signaling path quicker pstn also allows huge cost savings unlimited amounts data sent extra expense.broadband alarm monitoring increasin... |
Security alarm | internet used primary signaling method critical security life safety applications frequent supervision messages configured overcome concerns backup power network equipment signal delivery time.typical applications connectivity concerns controlled normal supervision messages sent daily weekly.various ip alarm transmissi... |
Security alarm | ref ansisia dc without protocol provides encoding scheme transport mechanism carry data previously defined alarm protocols including latest contact id sia dc sia protocols.ref ansisia dc.several manufacturers panels receivers reported developing released support dc.radio alarm dual signaling dual signaling method alarm... |
Security alarm | option ip used frequently due issues installation configuration high level i.t expertise often required addition alarm installation knowledge.a dual signaling communication device attached control panel security installation component transmits alarm arc.number different ways via gprs radio path via gsm radio path via ... |
Security alarm | helps eliminate false alarms unnecessary responses.dual signaling helped considerably restoration police response instance phone line cut dual signaling device continue send alarm calls via one alternative paths either confirming denying alarm initial path.in uk csl dualcom ltd pioneered dual signaling .company offered... |
Security alarm | may beneficial owner medical emergencies.actual breakins speaker phones allow central station urge intruder cease desist response units dispatched.listenin alarm monitoring also known immediate audioresponse monitoring speaking alarm systems uk.alarm monitoring services list services monitored central station expanded ... |
Security alarm | alarm response united states police respond least million alarm activations year estimated annual cost .billion.depending upon zone triggered number sequence zones time day factors alarm monitoring center may automatically initiate various actions.central station operators might instructed call emergency services immed... |
Security alarm | alarm systems tied video surveillance systems current video intrusion area instantly displayed remote monitor mention recorded.some alarm systems use realtime audio video monitoring technology verify legitimacy alarm.municipalities around united states type alarm verification allows property protecting placed verified ... |
Security alarm | highsecurity alarms may require multiple codes fingerprint badge handgeometry retinal scan encryptedresponse generator means deemed sufficiently secure purpose.failed authorizations result alarm least timed lockout prevent experimenting possible codes.systems configured permit deactivation individual sensors groups.oth... |
Security alarm | escorted.case remote monitoring center arrange oral code provided authorized person case false alarms monitoring center assured alarm response unnecessary.access codes also hierarchy oral codes say furnace repairperson enter kitchen basement sensor areas silver vault pantry.also systems permit duress code entered silen... |
Security alarm | owners buildings fined generating false alarms waste time emergency personnel.false absent alarms united states department justice estimates alarm calls law enforcement false alarms.system reliability user error cause false alarms sometimes called nuisance alarms.false alarms costly local governments local law enforcem... |
Security alarm | multiple false alarms property persist property could even added response list bars police dispatch property except event verified emergency.approximately police alarm calls actually involve crime.nuisance alarms occur unintended event evokes alarm status otherwise properly working alarm system.false alarm also occurs ... |
Security alarm | easier know false alarms system designed react condition.failure alarms troublesome usually require periodic testing make sure sensors working correct signals getting monitor.systems designed detect problems internally low dead batteries loose connections phone circuit trouble etc.earlier nuisance alarms could set smal... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.