Daisy Chained Fiber Explained

Author: Brian Rhodes, Published on Jul 26, 2013

Fiber is a mainstay for networking cameras run far apart. The number of cameras seldom matches the fiber available, and having two strands to run multiple cameras can be a showstopper. In this case, 'daisy chaining', or running multiple cameras in series is a common solution, but it can be a major headache when equipment breaks. In this note we look at fiber 'daisy chaining', discussed why it is used, and what options for improving reliability are available.

Definition

** ***** '****-**-****' **********, '***** ********' *** * ****** ****** ** ********* ******** * ******* of ******* ** ******. ***** ********** ********* ********** *** **** *** **** ******, ***** **** ****** ***** * '****' in *** *****, *** *** ****** **** *** ****** ******* down ***** ***** ******** ** *** ***********. 

*** ***** ********* *** ***** ******** ********:

**** *****, * ***** ** *** ** *** ***** ***** results ** ******** ******* ***** ***. ****** ****** ******** ******** using '****' ** '***** *********' ********, ***** ***** ***** ********** ** ****** ** * single ****. ******* * ****** **** ** ***** *** ************* handle **** ***** *** ********* ** ****** *****, **** ***** is ******** ******, *** *** ********** ****** ** '*** ****** fiber' ********* ** ******* ******** *******.

The ***** ******** *********

***** * ****** ***** **** *** ** **** ** ****** the *** ********* ** **** *******, **** ****** ***** *** own ********** **** *** *******. ******* ******* **** ***** ** costly ** ************* **********, ************ ****** ********* *** ********** ****** to *** ******** ******* ** * ****** **** ** *****. Additionally, *** ****** ****** **** *** ************ ******** *** ***** can ******* **** **** **** ** *********, **** *** * small ************ ******.

Ideal ** *********

******* ***** ***** *** **** ******** ** ****** ** ***** in ***** ** ***********. ****** * ************ '****' ****** ********  several ******** ** *****, **** *** **** ** **** ******, is *** **** ********** ********. ** *** ******* *****, *** others *** **********.  *******, **** ******** ** ************* **** ****** and ******** **** **** ***** **** * ******* ***. 

*************, ***** ****** ****** ******** ***** ******** ** ******* **** * ****** ****. However, ***** **** ******* *********, ** ******** ******** ****** *** fine ****** *********** **** **** ****** ****** *** ***** ** typical ******* **********. ****** *** '**** & ****' ****** ** ethernet *******, ***** ******* **** ** ****** ******** ** ***** interference **** **** ***** ** * *****, ** *********** ***** quality ******** ******. 

*** ***** ***** *********** **** $**,*** ** *****, *********, *** terminations *** * ~** ****** ****** *** ***** * ***** 'Star' ***** ******* ********:

*** ** **** ********* (** ****** *********) *** ******* ****** of ***** ** *** *** ********** ****** *******. **********, ************ that ***** **** ******* ****** (**: *****, ***********, ******* ****, Municipal *******) **** **** * ****** **** ** ****** ** work ****.

*** ***** ***** (********) ******* *** ***** ********* *** **** common ********:

*************, "***** ********" ******** **** * ****** **** ** *****. Using * ****** ******* *********** *** ***** ** ** ******** ********** *** **** ******** ****** ********. ********, ** ***** ****** ********, *** ***** connection ** ****** *** ******* **** * '***** *********', **** allows ** ** ****** ********* ********** (******) ******* ** *** a ******* (*****) *******.

********* ************** *** ***** **********, *** *** '********' *******, *** *** other *** '**********' ************. **** '***** ********', **** ********** **** depends ** *** ***** ****** ** *** ********; ** *** example *****, ** ******* * ** ******, **** *** ****** is ********. *******, ** ******* * **** ****, **** *******, and *** ***** ******* ** *** ***** *** ********.

'**** ********' ****** ***** ******* *** ******* ****** ******* **** daisy ******* *****, ******* *** '****** *******' ** **** ******* by *** ***** ********* **** *** *** **** ** ***** connecting **** - ********* ****** ** **** *******.

Improving ***********

*** ********* ** ***** ******** *** ** ********* **** * few ****** *********. ** ** ********** ***** **** *** ** run ** *** '****' **** ** *** *****, '******** ****', ** '***** ******** ****' *** ***** ** *********** *******. The ***** ***** ***** **** **********:

*** ********** ***** **** ***** * '****' ** *******. ********** '**** ***.** (***)'******* ** *** ****** ******* ** * ****** ** '****************' failover, ****** * **** ****.  **** ** '******* *' ***** in *** ***** ******, *** ****** ****** ***** *** * good ******** ********** ** *** *** ******.

Comments (6)

we are using the same ring topology in our upcoming project for perimeter cameras

We use this apporach with many perimeter or multi-building systems. If possible and economically feasible, it's best practice to run the return fiber (segment 3 in the above diagram) back to the switch in a separate conduit. That way if a conduit gets cut (happens a lot when utilities contractors trench) there is no loss of functionality.

The minumum density of fiber that we pull is a 6-strand. The cost difference between a 2-strand fiber and a 6-strand is fairly minimal as part of the overall cost (trenching, conduit, labor). With a 6-strand, if you don't have a separate return conduit, you can still create the STP ring and have a pair of fiber left over.

We frequently face this kind of topology, and usually the question ends up being: Will the core switch with sfp module brand "X" work with media converter brand "Y"? To be on the safe side, we specify the same provider for both, or other times we just use the same media converters connected to a copper port of the core switch (instead of an SFP module).

I seriously doubt that the picture is what the text claims it is. Using a Reconfigurable Optical Add Drop Multipexor (ROADM) is silly on its face. And there are no multimode ROADMs. The fiber in the picture is all orange and therefore not single mode. And -- unless you needed to send video TO the cameras, you would just use colored optic SFPs and sort it out with a CWDM mux at the hub site. But this is still not a good idea.

Standard data wiring is radial from concentration points -- usually in data closets. I assume that the problem is outdoor cameras that exceed the 100 M copper cable distance. Otherwise that would be the more cost-effective and maintainable solution. If you need to use fiber to get to the distant cameras, you should run it radially back to a serving switch. You can use the same conduit layout as you would for daisy-chained -- just run multiple fiber circuits in the cable. One conclusion in the article that I agree with is that glass is cheap. The money is in the conduit.

What are the brands of the media converters?

If you going back with the fiber to the switch (better with one additional switch, where both are interconnected) after the last cam/media converter, then you building a classic "campus topology", and it will be less issue if something brakes in the chain or maintaining one of the switches.

Sometimes this is more wisely to build than building "star topology", even if my preferred topology is star.

Login to read this IPVM report.
Why do I need to log in?
IPVM conducts unique testing and research funded by member's payments enabling us to offer the most independent, accurate and in-depth information.

Related Reports on Networking

Cybersecurity Insurance For Security Integrators on Nov 29, 2018
Most security industry professionals carry insurance to cover themselves in the event of a general loss. However, most are not carrying cyber...
Security Sales Course 2019 on Nov 29, 2018
The next IPVM Security Sales Course starts in January 2019. This sales course is customized for the needs and challenges specific to...
Ubiquiti Protect Video Surveillance Profile on Nov 07, 2018
Ubiquiti has now been in the video surveillance market for 7 years (see our first coverage back in 2011). In that time, the company's revenue has...
Winter 2019 IP Networking Course on Nov 05, 2018
This is the only networking course designed specifically for video surveillance professionals.  Lots of network training exists but none of it...
Huawei To Be “Top Three Global Position” in Video Surveillance on Oct 29, 2018
Huawei - China’s biggest networking gear and smartphone maker - plans to become one of the top three global video surveillance manufacturers in...
IP Camera Installation Tool Shootout - Avigilon, Axis, Ideal, Hanwha, Triplett, Veracity on Oct 23, 2018
Setting up IP cameras has historically been challenging, with techs often precariously using a laptop on a ladder or lift. Some options for install...
IP Camera Cable Labeling Guide on Sep 14, 2018
Labeling cables can save a lot of money and headaches. While it is easy to overlook, taking time to label runs during installation significantly...
Access Control Course Fall 2018 on Sep 06, 2018
Registration IS CLOSED ends this Thursday. Register now. If you are looking to strengthen your ability to design and deploy access systems or...
Ligowave Wireless Profile - Ubiquiti Competitor on Aug 27, 2018
Ubiquiti has become the most common choice for wireless in video surveillance (see Favorite Wireless Manufacturers) but not without controversy and...
Directory of Video Surveillance Startups on Jul 18, 2018
This directory provides a list of video surveillance startups to help you see and research what companies are new or not yet broadly known entity...

Most Recent Industry Reports

ACRE-Acquired Open Options Access Company Profile on Dec 17, 2018
Who is the company ACRE is acquiring? In this note, we examine Open Options line for best customer fit, key features, pricing, and main...
Open Options Acquired By ACRE on Dec 17, 2018
ACRE is doing deals again. A year after they sold Mercury, they are buying another access control company - Open Options. In this note, we...
8MP / 4K Fixed Lens Camera Shootout - Dahua, Hikvision, TVT, Uniview on Dec 17, 2018
8MP / 4K fixed lens models are now common in lower cost lines, with nearly every Chinese brand and their OEMs now offering multiple options. To...
Network Cable Shootout - Belden, Commscope, Hikvision, Honeywell, NavePoint CCA, Windy City Wire on Dec 17, 2018
Every IP camera install needs UTP cabling. But how much of a difference is there between dirt cheap generic cables found online and the bigger,...
Hikvision Government Parent Holds Communist Party Congress on Dec 17, 2018
The Communist Party committee of Hikvision’s government parent, CETHIK, held a Party Congress earlier this month where senior executives, including...
Imperial Capital Security Investor Conference 2018 Review - ADT, Resideo, Alarm.com, Arlo, Eagle Eye, ACRE, More on Dec 14, 2018
Imperial Capital Security Investor Conference is an event matching industry executives with financiers that frequently leads to future funding...
Cisco Meraki New Cameras and AI Analytics on Dec 14, 2018
Meraki has released their second generation of video surveillance with 3 new cameras, AI-based video analytics, and 2 cloud-based storage...
Foolish Strategy: OEMing Facial Recognition on Dec 13, 2018
Almost as 'hot' as face recognition marketing right now is OEMing facial recognition. Last year, they were a who's who of company's with...
DVR Examiner - Video Recovery from Recorder Hard Drives on Dec 13, 2018
Bypassing passwords and long download times on-site, DVR Examiner collects and organizes video evidence directly from a hard drive extracted from...
2019 Access Control Book Released on Dec 12, 2018
This is the best, most comprehensive access control book in the world, based on our unprecedented research and testing has been significantly...

The world's leading video surveillance information source, IPVM provides the best reporting, testing and training for 10,000+ members globally. Dedicated to independent and objective information, we uniquely refuse any and all advertisements, sponsorship and consulting from manufacturers.

About | FAQ | Contact