Electrical ************ ******* ***** *******
** *** ***** ************ world, *** ******** ** often ** ******* *** NVRs, *** ****** ********* to *** ******* ** between. **** ***** ******* problems *****, ** *** be * *********** ******** to **** ****** *** tweak ********, **** ** discover ******** *** ***** present.
*******, ****** * **** look ** ******* *** resolve ********* ******. **** the ******* ** *** image *****:
********** ************ ** *** cabling ****** ***** **** type ** *******. *** only **** *** ***** transmit ******** **** *******, but ** **** *** attract *** ******** ********* 'noise'. * ******** ***** can ***** ** ** 'ad-hoc *******' ***** ********* why ***** ********* ** sometimes ********.
'STP' ** ********** ***** *********
* ***** ******** ********** between *********** *** *** STP, ** '******** ******* pair' ******* ******* *** primary ***********. *** ***** below ***** *** ********** metallic **** ********* *********** wire ***** ** ***:
'*********' ****** *** ** confused **** '***** *********' where * ****** ***** or ******** **** ** mesh ****** *** ****** bundle ** *****. ***** the ******** ** ************ wrap ***** ****** ***** wrap *** ****** ****** shares **** ** *** same ********, **** *** not ********** ** *** other *** ****** ** different ***********.
Other ***** *** ***
*** ****** ************ *** shielded ******* **** *****, 'STP', ** ********* ****** 'U/FTP' *** '**********/****-******** ******* pair' ** '*/***' *** 'Shielded/Foil-screened ******* ****' *******. Especially *** ********** ******* specifications, **** *** *** these ********* ************* ** describe ******** *******. *******, in ******* ***, *** 'STP' ************ ** **** widely ****.
Physical *********** ******* ***** *****
*** ********* **** ********** the ******** *********** ******* UTP *** ***.
- ******** **** ******:* **** ***** ** foil, ******** ********, ********* wire *****. **** ***** is ***** ****** *** 'drain', *** **** ** properly **********. ******* ** adequately ****** *** ***** can ******* *** ******** that *** ******** ** mitigate.
- ******* ******:*** ***** ****** ** foil ******** *** ****** add ******** ** *** cable ******. ** * result, * ******* ******* insulating ****** ** ******, which **** ********. *******, STP ** ******* *** thicker ******** ** ***, and *** ** **** difficult ** ******* ** a ******.
- *****, **** ******, *** Groundwires:********* ** *** ***** manufacturer *** ***** ** STP, ***** ******** *** be ******* *** ******** found ** *** *******. This ******** ******* ******* 'core' ******, ******* ** aid ********* *** ******, and ********** ********** ********* wires. ***** ** ** outdoor ***** ***** **** a ****** **** **** separates *** ***** **** quadrants ****** *** ******.
STP ** *** ********** ***********
***** ********** ******** ******** provide *** **** ********** that *** **** *** possess.
- *** **********:*** ******* ********* ** shielding ** ********** **** environmental*************** ************, ** ***. ******* each **** ** ************ wrapped, *** ******* *** ambient ************ ** ******** and ***** **** *** cable ** ************* ********* or **********.
- ******** **** *****: ************ *** ** a '***-*** ******' ** that ********** ******* ** a ****** ****** ** interference. ** **** ************, like ********* ******* ******* or *************, ****** ******** cabling *** ** * uncontrolled ******* *** ************ that ****** ***** *********** off. *****, *** ******** of **** ********* ********* or ********** **** *******.
Cost **********
***** *** **** ******* $20 ** $** *** camera ******** ** *** cabling, ******** ***** **** of *** ****, ***** on *** ***** ***** ~40% **** **** *** and ********* ** *** much ********** ***** ** larger ******* ** ****** for *** ******, ******* and **** ***** ***.
Use *** ******* ****** ******* ** ************
******, *** ****** ** used ***** ************ ***** be * *******. ** firm ** ***** ***** places ******** *** *****, here *** **** ****** where ************ ***** ****** video *******:
******** ** **** ******* Wiring
***** ****** *** ********* with **** ************ **** run ******** ** ** too **** **** *****. Even ****** *** * compliant ******** ***** ****** a ******** ******* *** be * ****** ** video ************.
***** ** **** ************* exists *** **** ** use *** ** **** situation *** *****, **** practices ** **** ********** design ****** **** *** data ******* ******* *** same *******, ********** ** how ** ** ********* in*** ** *******, **** ** *** using *** *****.
**** ********* *******
**** ******* *** **** common ***************** ******** **** electric ******, ***** ************, magnetic *****, ** ********* can ********* *********** ***. Especially *** ********** **********, where ***** ******* *** common, ********* ***** **** is ** ********* **********.
***** ******* *** ************* by ***** '*********' **********, ** ***** reliance ** ******** ****** for *********. ***** ********* to ******* **** **** equipment, *********** ****, **** maglocks, ********** **********, *** industrial ********* *** ******** enough ************ ** ******* video *******.
*** *******/****** *******
****** *** ******* ************* radios ******* **** ************. While * ***** ******* may *** ** *********** enough ** ** * problem, ******** **** **** near **** ******* ********* or ************ ****** ** run ***** *** ** eliminate ********.
**************** ********
*** ** *** ******* sources ** *** *** common ***** ********. ***** the ****** ********** ** ethernet ****** ******* ******** of ***** ********, ** cabling ****** ** *** in ****** ***** ***** on*******, ** ****** ** run ***** *** *****.
**** *****, ***** *** many ********* ***** ******** 'installed ** ******' ** to ** **** *** video. ** **** *****, cabling ********** ********* ** the ****** ** ***** quality ******** **** ****** unfixed ***** *** ***** network ** *********.
Practical *** ** *******
** *** **********, *** vast ******** ** *** surveillance ******** ******* *** been *** ***** ***, and ** **** ** significant ****** ** ******. Since ********** ******** **** the *********** ****** ** imperatively ************ ** ********** and ********** ****** "**** practices [**** ** ****** available]", ** ** ********* suitable *** ***** ******* design.
Axis: ********* *** *** ********
******** ***** **** ************** declared *** ** *** mandatory *** ******* ******* per *** ********* ********** [link ** ****** *********]:
"*** ************** ** ** deploy ** *** ******* cable ** ********* ********** environments. ******** ** ********* indoor ************ *** ***** the ******* ***** ** located ** ******** **** electrical ***** ****** ****** or ***** ***** ********* loads **** ** ****** or ********** *** ** close ******** ** *** camera ** *** *****.It ** **** ********* to use an STP cable where the camera is used outdoors or where the network cable is routed outdoors."
**** ** * **** statement ***** ****~**% ** *** ******* are ********* *******. ********* ****' ************** may ***** * *********** increase ** ******* ******* cost *** ** ****** overkill ******** ** ****** problems *****.
******, *** ********** ********* with *** *********** *********** of ***. *** ******** use ** *** ** where ******** ** *** in *** '**** ****' areas ********** *****.
Test **** *********
***** ****** **** * * questions ****
[****: **** ******** *** originally ********* ** **** and ************* ******* ** 2017]
Comments (24)
Undisclosed Manufacturer #1
Cabling infrastructure properly designed and installed can eliminate a lot of the issues seen in the field with IPVS. BICSI is the global organization that drives standards and best practices in the structured cabling industry. If your not familiar with them, they are worth checking out.
Unfortunately a lot of bad habits surfaced when the industry transitioned from analog systems to IP systems. Installations best practices that worked for RG-6, will not work for UTP/STP systems. Performance verification is not always required for many IPVS installs, compared to traditional data installs. Improper pathways, mismatching components, poor field terminations, all contribute to poor IPVS installations.
While I understand the benefits of an STP cabling system, I don't believe it's necessary for all outdoor cameras. STP components are far more costly, and more labor intensive to install. It's not just the cable, but the patch panels, jacks, and patch cords as well. This will add additional expense when compared to a properly designed UTP installation.
IP data is IP data. Video requires reliable and timely delivery. On the network we can apply QoS settings and other advanced networking features to ensure timely delivery of multiple traffic types, but if the packets don't transport reliability across the infrastructure it's a moot point at best.
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Brian Rhodes
Thanks for the comment. We refer to those BICSI guidelines and recommendations in our BICSI For IP Video Surveillance Guide and IP Networking course, and the 'best practices' aspect is useful.
Installers should buy or find a copy of the TDMM even if the local AHJ has no idea what it is.
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Undisclosed Manufacturer #1
Thanks Brian. I've been a BICSI RCDD for over 15 years... great training... great organization. Agreed... every installer should have a copy of the TDMM as a reference manual if nothing else. Merry Christmas!
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Undisclosed Manufacturer #2
Basic BICI knowledge will tell you that most signal current is carried by the outer surface of each copper conductor. Not down the center so it makes it difficult to keep it from being interfered with. Biggest give away is running cable in parallele with other type of cable. Including inside conduit.
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Undisclosed Manufacturer #2
Problem we have is on large jobs the electrical contractor runs their own low voltage then hire a security integrator to finish the hand and bang portion. In some cases the low voltage guy is only making 12% profit. So if their is a mistake he can eat it big time. So they will go the less expensive route. Less expensive in Labor time and call backs.
I have seen security contractors use the local big cable house to run all the low voltage infrastructure then they can price their portion cheaper than the contractor/integrator that has all the work done in-house.
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Dennis Ruban
Back home in Europe we always called cable by type, like utp or ftp, etc. By default, it means you talking about cat 5e cable. If you need cat6, 6a, 7 for some reason, you just specify category as well.
when I moved to Canada, I figured, that most of the installers never heard about data cable types (utp is the only one) and they believe that cat5e is a cable for 100mbps and cat6 is for gigabit
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Undisclosed #3
Yes, one may be best off using the full specifier instead of ‘STP’ considering the many different uses:
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Undisclosed Integrator #5
There is an recomendation about analog cameras?
If I'm using a TP cable with baluns, have I use an STP cable to outdoor cameras?
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Undisclosed Manufacturer #1
Shielding helps prevent EMI (electrical magnetic interference). Signal loss is caused by attenuation (loss as the signal strength travels the length of the transmission cable). When it comes to coax or STP cable, both of these properties come into play.
STP cable will by default provide greater EMI protection over UTP cable, regardless of where installed (indoors or outdoors). Cable twist reduces pair-to-pair cross-talk, which is signal jumping between the pairs within the cable jacket. Attenuation can be reduced by using a thicker gauge wire. Example, 24 gauge wire will have less attenuation that 26 gauge wire because of it's electrical properties. With high end UTP cable, some products use 24 ga and some use 26 ga. This is generally found in Category 6 rated cable and higher only.
Coax is a great medium for analog signals because of its robust shield and the physical size of it's conductor. The challenge always was the cost of the material, cable path fill, bend radius, and home run design requirements. UTP with baluns can help solve many of these short comings, and provide a future infrastructure upgrade path to IP camera connectivity.
I'm not disagreeing with Brian, just diving deeper into the weeds.
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Chad Rohde
Before I knew anything about codes, best practices, and what shielded or unshielded cable even meant, I worked for a company doing a lot of old work wiring. We would run wire breaking every rule in the book, twice, on the same 500' run. Looking back at it, it is surprising that we never really had problems other than the horrible connections we crimped using some primitive tools provided to us.
And even now the only major problem I can think of concerning interference is the little AC/DC transformer wall worts.
John you should start a pole to find out where others have found specific examples. I'm not much of a book person.
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Chad Rohde
Axis reasoning for STP outdoors is more than likely trying to protect their equipment. Not so much preventing interference. Netonix provides some good hands on advise with outdoor cabling in this respect. It's specific to communication towers, but still relevant for outdoor camera runs. And backed by actual field experience.
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Undisclosed End User #6
I clicked on the conduit link and was surprisingly informed.
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