Wireless ******* *** **** *** ***** *****
********** ******** *** ******** ******* as * **** ******* measure. ***** ** ******* the ******* ******* *** an ************ *******, *** running ***** **** ******* to *** ***** ***** is ********* *** **** time ********* ****** ** ** installation.
**** ** ********** **** in *********** *************, ***** wires **** ** ****** and ********* *** **** to ** *****. ***** residential ************* *** ********* take * **** ** more ** ****, *** even * ***** *********** installation ***** **** * full *** ** ****. Using ******** ******* ********** the **** ** ***** wires **** ***** *** ******* them ******* ****** *** crawlspaces.
******** ** ******* ***** ** a *********** ************ ***** time *** **********, *** technicians ******* ** *********** wiring*** ****** ****** *** than ***** ***** ***********, ******* ** **** higher ***** *****. ***** ******** sensors ****** ***** ********** to ******** ************* ****** and *******.
Using ******** ******* ** *********** ************
**** ***** ********* ********** in door-to-door ***** *****. ** this *****, ***** ** salespeople ***** ** *** door ** ***** ****** **** in * ************, ****** to **** **** ***** services. ** **********, * salesperson calls *** ** ************ crew ** ******* ** alarm ** **** ** possible. ***** ******* *** commonly sold ********* *******, ********* at ** ***** ****, with ***** ********* ********* to **** ***** ***** back ** ******** *** monitoring ********.
*** **** ***** ** work, ************* **** ** completed ** ******* *** as ************ ** ********. A **** ** *********** capable ** ********** * ****** wired ****** ** *** day *** ******** ***** or **** ******* ******* in * ****** *** when ***** ******** *******, allowing *** ***** ******* to ***** ******** *** customer *** ********** ******* sooner.
******** ******* *** ***** used ** *****, ****** homes ** ****. ********** ***** can ** * ********* challenge, ********** ** *** sensor **** ** * long ******** **** *** panel, *** ***** ** multiple ***** ** ******** floors **** **** *** sensor, ** ** *** home ***** ******* ****** and ******. ** **** cases, using ******** ******* ** far ******* **** ****** a ********** ** *** a ****.
Factors ** ******* ***** ** ******** *******
******** ******* *** ************* more ********* **** ***** sensors. *** ******* ********** are ********* *-* ***** more ********* **** ***** wired ***********. ** ********, many ****** ******, ********** ****** and ********** ***** ******, do *** ******* ******** sensors. **** ***** ***** panels, ********** **** ** add * ******** ********, an ***** *******.
*********, ******** ******* *** only *** **** ********** ****** where *** ********* **** is **** **** *** labor **** ** ******* * wire.
******** ******* *** **** transmit *** ******* *********, typically ***-*** **** (**-** meters). ** ********, ***** can ******* ******* ** panels ******** ** **** away. ********** *** *** repeaters ** ****** *** range ** ******** *******, but ***** *** **** **** to *** **** ** an ************.
********** ***** *** ***** *******, not ********, ** ********** and ********** *************. *** labor **** *** ***** sensors is **** ***** **** the ***** ** *** need ** ** *********, making ***** ******* *** more ****-********* ****** *** these applications.
Advantages ** ******** *******
- ***** ***** *****: ******** sensors ******* **** ********** to *******, *** ******** fewer ***** *** ***** to *******. **** ***** that **** ************, ***** paid *********** *** ******* wireless *******, ***** ***** sensors ******* *********** ********** with ********* ***** *****.
- ****** ******* ****: ******** sensors *** ** ********* relatively *******, *********** ******** an ************ **** ** ******** two ** **** **** in * ****** ***. In ********, ** ***** ******* * day ** **** ** run ***** *** *******. This ***** ****** ***** for technician ********.
- ********** *******: ******** ******* *** ********** **********, ** *** ******** sensor ************ ***** * health ***** **** ** the ********. ** ******** interrupts **** ******, *** alarm ***** **** **** a ******* ****** ** the ******. *** ***** can ** ********** ** send ******** ******* ******* to ******* ******* ** well. **** ******** ** ****** or ****** *** ****** will ** ******** **** way. **** ******* **** built-in *** ********* *** tamper ******** ** ****.
Disadvantages ** ******** *******
- ********** ******: ******** ******** ******** *** ********* ** *******. They require **** *** * battery, ***********, *** *******, and therefore **** ** ************* larger **** ***** ********. Higher *** *********** ******* sometimes *** ***** ******** contacts for **** ******, ********** for ****** ** ********** doors. **** ** **** an ***** **** ******** contacts; ***** ***** *******, such ** ****** *********, ******** ***** ***** *******, *** ***** ********* ** *** ****** **** this *******.
- ******** ******* *******: ********* for ******** ******* **** * life ********** ** ~* years, ********* ** *****. Upon ********* * *** battery ******, *** ******** must ****** *** *** a ******* **** ** replace *** ********* **********, a ******* *********** ** the ***-******** ********* **** wireless ******* ***.
- ******** ***********: ******** ************ have * ******* *****, typically ***-*** **** (**-** meters) ********* ** **** and ************ ***********. ** contrast, ***** ******* *** be ******* ******** ** **** from *** *****.
- **** *********: ******** ******* are ***** *** ** three ***** **** ********* than ***** ***** **********, negating **** ** *** cost ******* ********** **** reduced ***** **** *** faster ************ ****.
- ********** *********: **** ***** panels, ********** ********** ******, cannot ******* ******** ******* without ********** *********. ****** to *** * ******** receiver **** ******* **** of *** **** ******* associated **** ***** ******** sensors.
- ****** ******* *****: ********* batteries/ ***************
Wireless ******* *** ***** ***********
******** ******* *** ***** not ********** **** * receiver **** ******* *****. For *******, ********* ******** sensors *** *** ********** with ***'* *********. ******** a ******** ****** *** number *** **** ** sensors ********* ** * system. ***** **** ****** have * **** ********* ** compatible *******, **** ****** may **** **** * few. **** ********** ****** be ***** **** ******* when ********** ******** *******. If * ****** **** a ******** ******* ** required *** ** ***********, the ********* *** **** to ****** *** ***** of ***** ***** ****** and ******** ** *** system.
**** *************** ** ***** a ******** **********, *** a ********* ***************. ******** sensors **** ** *** a *** ********* ******, but receivers *** ******** ******** to ****** ******* **** sensors **** ** ***** manufacturers.
Common ******** ***********
******** ******* ***** *** RF ******* ** ***********. These ******* *** ********* in *** ***-*** *** range, ******** ******* ************* use *** *** *** range. ** *** ****** States, *** *** ********* RF *****. ************* ************ ***** ******* **** the *** *** ****** approval****** ******* ******* ************ wireless *******. ******* *** devices *** ***** ******* frequencies *** ****** *** published ** *** ***, it ** ******** ********* * ********* *** ******* the ****** ***** ***********.
*-**** *** ********* ********, *** *** frequencies ****** *** *** typical ** ******** ***** sensors. **** *** ******** for **** ********** ********, but ********* *** *** proprietary ** * ****** panel.
Common ******* *****/*****
******** ******* *** ** internal *********, ***** **** be ******** ************. ******* life ** ***** ** the ****** ** *********** the ****** *********** *** the *********** *** ****** is ******* **, *** therefore *** ****** ****** from ******** ** ********. Contacts ********** ****** ****** doors *** ******* *** go as **** ** ***** years ******* ******* * replacement *******, ***** * motion ******** ** * heavily ********** ******* ***** need * *** ******* every ****. ******* ************ can ******* ******* **** as ****, ******** ********* **** or *** ************ *** generally **** ****** ** residential ************.
********* ****** ********* *** be * **** *********, and ********* ******, *******. Alarm ***** **** ***** ******* can ******* ******* ********* on ***** ***, *** those **** ***** ******* and **** ** ***** sensors **** ***** *** for * ******* ****. The **** ** ***** service ***** *** ********* upset ** ******** ***** users, *********** ****** **** **** susceptible ** ****** ** switch ***** ********** ******* at *** *** ** their *********.
***** ********* ********* ***** service ********* ** ***** battery ***********. ******* *** cost ** *** ******* contract **** *** ********** fee ***** **** *** pain ** ********* *** cost ** *** ******* replacement **** *** ****** of ****** ** *****.
*** **** ****** ******* types **** ** ******** sensors:
- ****** ***** ********* *** often ~$*.** *** **** purchased ****** *** ~$*.** each **** ********* ** bulk.
- ****** ********* *** ***** ~$5.00 *** **** ********* singly *** ~$*.** **** when ********* ** ****.
- ** ********* *** ***** ~$1.00 *** **** ********* singly *** ~$*.** **** when ********* ** ****.
** ********* *** ****** available *** **** **** about ********. ****** *** CR123A ********* *** ** purchased in **** **** ***** distributors *** ******** *********.
Most ****** ******* * ******** ********
**** ***** ****** ******* * wireless ******** ** ** compatible **** ******** *******.
******** ********* ******** **** ** the ****** ***. **** powers *** ******** *** allows ** ** ******* data.
**** ********* **** ****** to *** ****** ** wireless ******* **** *** support, **** *, *, 8, *** ** ******* being *** **** ******. Some ********* *** ******* only ** *** ****** of ***** ********* ** the *****.
******** ********* *** ******** mounted ******* ** **********, as ***** *** ***** or ***** ******** *******. ****** alarm *****, ***** ************ ** *** ***** inside * ***, ******** ********* **** be ****** ** ** unprotected **** ** ***** to ******* *******. **** means **** *** ****** to *** ******** *** potentially ***** *** ******** zones.
** ******* ****, ******** receivers ******** **** ****** switches ** ****** ********** attempts ** ****** *** receiver. ** ********, *********** commonly ******* *** ******** in * ****** ****, such ** *** ****** of * ******.
**** ***** ****** **** built ** ******** *********. **** ********** alarm ****** *** ******** to ** ******** ****, with ******** ********* ***** right **** *** ******.
******** ********* *** ***** ~$100 ***.
Hacking ******** *******
******** ******* *** ** susceptible ** *******. ** the ****** ** *********** between *** *********** *** receiver, ** *** ** jammed ** *******. ** contrast, ******* ** ******** a ***** ****** ******** physical ****** ** ****** the ****** ** *** wire, ***** ** **** more ********* ** **********, especially ** *** ******* is **********.
***** ********** ** *** hack **** ** *** ** **** ** ADT ***** ****** ****, * ************ ********* SDR *** ** **** to **** ***** ******* or ***** *** ****** signals ** *** ********, while *** ****** ****** signal ****** ** *******.
**** ******** ******* *** more ********** ** ******* than ******. *** *******, some ******** ******* ******** their ******* ***********, ** known ***********, ************* *********** **** ************ ***** be ******. *** ******** ******* a **** ***** **** were**** *** ********* ***** unencrypted ******** ************. **** ***** ************* *** still ****************, ***** ********* ******** transmitters.
**** *************, **** ************, ***** *** **** these ***** ******************** ********* *** **** levels ** ***** ** pull ***. *******, *** **** is ***** *******
Encoded ** *-*** ********** ********
***** **** ************* **** ********** for ***** ******** *******, including ***,*******, *** **** (***** ** ******* ********-**** panels), ****** *** ********* ******* to **** ****** ************ more ********* *** *** way ************* ** **** jamming ** ******** ******** easier ** ******. *** example, ***,***, ********* *** ********* ******* or * *** ********** encryption.
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Comments (3)
Mark Hillenburg
Nice article. It might also bear to mention that not only is 900mhz frequency hopping more secure. Typically 900mhz has a longer range. For example our standard transmitters have a typical range of 1200 ft open air and our High Power Receiver tests out at 1.7 miles.
Also the two-way nature of (at least the DMP) 900mhz wireless offers some advantages. Single message & single ack, reduces battery drain. The ability to adjust the detector over the air, sensitivity, pulse count, put it in walk test or even put it to sleep in the disarmed state all offer unique advantages. The ability to push a message to the wireless allows for wireless relays, sounder, lights, and even wireless smokes that sync their sounder. (commercial fire UL864 listed).
There is more. But I'll give you all a break. :-)
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Mark Hillenburg
Here is our DMP White Paper Two-way Wireless System Offers a Competitive Edge
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Brian Hampton
One more con I have run into with wireless is that if there is any possibility of moisture entering the sensor it can fail prematurely.
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