Fibre ready Surveillance Cameras

Guys, want to share something really interesting that I came across…IP camera with a direct fibre interface. This one has an on board SM SFP  and can talk to a switch directly over fibre .

That really simplifies the connectivity by doing away with having to use media converter to establish  a copper connection besides getting over bandwidth and distance issues. Also no EMI issues either…way to go isn’t it??

Although these cameras cost a bomb today the prices will come down to reasonable levels as the benefits become evident.

Singlemode or Multimode ?

Very often we come across this question ..don’t we ? How does one make a choice especially when segment distances are under 2000m ?  Well, the choice will become clear after asking just a couple of questions:

  1. What is the total optical fibre cable(OFC) length that you are going to be using in your fibre optic network ?
  2. How many fibre optic transceivers are there in your network ?

Once you have answered the two questions above we get down to some simple number crunching:

(Total Cable length x Rate per meter of multimode cable) + (Total no. of fibre transceivers x Rate per multimode transceiver)  say X

(Total Cable length x Rate per meter of singlemode cable) + (Total no. of fibre transceivers x Rate per singlemode transceiver)  say Y

Check whether X < Y or Y< X …you have your answer there !

At data rates 100Mb/s and below with segment lengths less than 2Km, you are likely to make the right choice.

Of course the fiber of choice is singlemode if you have long segment lengths  >2 Km with total requirement of cable running into tens of kilometers and high bandwidth requirement.

Is Multimode going to be around at all is going to be my next question ? Wanna think about it ? Please do because that’s going to be subject of my next blog…happy reading folks and have a great year ahead !!

HNS

Multimode fiber – Is it going to be around ?

Let me the outset clarify that I do not hate Multimode fibre but lets accept the fact that it is really no match for singlemode fibre when it comes to distance and bandwidth.

We continue to come up with newer standards for Multimode fiber..OM4 now right..10G over 1 Km when OM3 was all about 1G over 1Km.. come on guys we need to wake up and smell the coffee unless we have companies out there having a vested interest in keeping Multimode fiber and transceivers on the ventilator.

Singlemode cable and transceiver prices have been moving down steadily over the last 4 – 5 years because of exponential rise in volumes and today we have a situation where singlemode fast ethernet media converters are cheaper than multimode.

Wouldn’t it make sense to have all our campus networking on a Singlemode fibre backbone ? It makes sense to me..how about you ? With wavelength division multiplexing you have the option of moving huge amounts of data on the same singlemode fibre at different wavelengths..Hows’s that for economy and future proofing your network ?

HNS

Brand focus or solution focus

Aren’t we all enamoured of brands in the consumer space ? Fibre optics is no different.

You can offer a solution with branded cables mostly MNCs or equally good quality Fibre optic cables made by Indian manufacturers at a deep discount to the branded product.

In fact the same design of cable is going to cost 40 to 50% more with a MNC brand printed on it.

As responsible integrators it’s our job to educate our customer about this price differential and leave the choice to him.

Treating customers money as our money is the key to enjoying their patronage, establishing credibility and getting repeat business.

Come and try out how it works at Yamini Engineers. We give you maximum bang for your buck ☺

HNS

Checking live fibre with your smart phone

As installers we need to check if a fibre is live or not or whether a source is emitting or not.  Since the wavelengths are not in the visible range peering at them will not help and could cost your eyesight.

Here’s a simple way. Just look at the connector tip of a live patch cord or the transmit port of the transceiver through your camera phone. The light will show up if the fibre is live. Don’t believe me try it out with your TV remote and see the light pulse through your cellphone camera.

At Yamini Engineers we love to share small tips that can save a lot of bother in the field. Stay safe use your camera phone next time around.

HNS

The optical link budget

We often come across “optical link budget” when trying to network devices with on board fibre optic transceivers. How do we factor this parameter into our network ?

Optical link budget simply means the maximum loss acceptable on a fiber optic link connecting two points. Therefore, we must ensure that the actual loss on the link is less than the specified value.

Let us look at an example :

  1. Device port Multimode 850nm optical link budget 10 dB
  2. Now, Multimode fiber has a typical attenuation(loss) of 3.5dB/Km @ a wavelength of 850nm
  3. Therefore with a link budget of 10 dB, we can have a link length of  10/3.5 = 2.85 Kms max in theory
  4. In practice, we need to consider losses due to splicing, macro bending etc which during the lifetime of the cable will impact attenuation.Let’s say we have an allowance for these losses as 20% of the link budget which 20% of 10dB =2 dB
  5. Now in actual terms the link budget becomes 8 dB and therefore the link length of 8/3.5 = 2.28Kms say max 2Kms to be on the safer side.

Now that we know how to interpret optical link budget, we can also use this information to compute the optical link loss and that’s in our next post. As you keep reading the stuff we post here, you will see that we at Yamini Engineers have a method in our madness !!

HNS

Welcome to Yamini Engineers Blog!

Connecting Fiber and connecting the Fiber Optic Community

2017 Communities of practice for all those who touch the Fiber Optic Highways and networks in any manner.

Here, we share best practices.

Worst nightmares on the field.

Lessons learned. Problems solved.

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This is our professional space for collaboration and group wisdom.

Cheers to 2017!

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