Din-rail-mount enclosure for Fibre Lite and Fibre Lite Plus

*** NEW PRODUCT ***

The LDIN-C is a din-rail-mount enclosure that can accommodate any Fibre Lite or Fibre Lite Plus cage card. This enclosure requires a 12Vdc power supply.

Compatible Part Codes:

Fibre Lite: LVTX-010-RMM, LVTX2-010-RMM, LVRX-010-RMM, LVRX2-010-RMM, LVTXD-010-RMM, LVRXD-010-RMM, LDTX-010-RMM, LDRX-010-RMM, LCTX5-010-RMM, LCRX5-010-RMM, LATX2-010-RMM.

Fibre Lite Plus: PVTX-010-RMM, PVTX2-010-RMM, PVRX-010-RMM, PVRX2-010-RMM, PVTXD-010-RMM, PVRXD-010-RMM, PDTX-010-RMM, PDRX-010-RMM, PCTX5-010-RMM, PCRX5-010-RMM, PATX2-010-RMM.

Fibre Lite stand-alone video and data link

Single Pan/Tilt/Zoom (PTZ) camera, stand-alone, multimode fibre optic video and data link.

Fibre Lite stand-alone video link

Single camera, stand-alone, multimode fibre optic video link.

Contact Closures and New Field Lite Enclosure

It’s been a busy year and I can’t believe that we are half way through June. We have finished development on the Fibre Lite Plus product range. Fibre Lite Plus is a multimode analogue link in 1300nm with enough optical power budget for 6km of cable. All the Fibre Lite (2.5km multimode) products are available in Fibre Lite Plus (6km multimode).

We have also introduced 2 new products:

• This offers 5 inputs which are transmitted as data, then received and presented as dry relay output contacts at the receiving end.
  
• Field Lite Enclosure. This enclosure features a 12Vdc 2Amp output, is battery backed by a 7AH battery, has a 12way splice cassette and 2 slots which can accommodate any Fibre Lite, Fibre Lite Plus or DTX Series cage card.

32 channel Fibre Lite video receiver

Here we have it a Fibre Lite card cage populated sixteen 2 channel video receiver cards.

Fibre Lite 2 channel receiver card

Hi there,


Sorry I’ve been out of the loop the last couple of months. I’ve been busy developing a new product range with my team. This is our first product introduction this year and in true BFR tradition it's built to last.

I’m proud to introduce the Fibre Lite 2 channel video receiver card. With this unit it is possible to populate the 2U Fibre-Lite cage card with up to 32 channels of fibre optic video receivers.

This receiver has Automatic Gain Control with a range of ±6dB and normalizes the video to a standard 1Vpp level no matter if the device connected to its composite video output is terminated at 75ohm or hi-impedance.

Keep watching this space for new procucts.

Digitally Controlled AGC

AGC (automatic gain control) is nothing new and is used in a variety of equipment from CCTV cameras to fibre optic transmission equipment. When it came time to implement AGC in our Fibre Lite range of products we decided to do something really special with the AGC.

We analysed the sort comings of traditional Gain Control on analogue fibre optic equipment and found that the biggest problem was video drift. Simply put this is when the image starts losing its contrast, colour and eventually video sync (the image rolls on the screen). Video drift is caused by a number of factors like; cable aging, electronic component aging, large temperature fluctuations, additional losses on the cable due to the cable being damaged and requiring some splicing work, etc.

The Gain Control is there to compensate for all these variables but it’s normally a manual adjustment. This means that the system requires regular servicing by a qualified technician to maintain a crisp high resolution image.

We thought that in today’s world of high labour costs and the low cost digital microprocessors; why not have a microprocessor continually sampling, analysing and adjusting the gain control? This is how we come up with the idea of Digitally Controlled AGC. In our Fibre Lite range each fibre optic video receiver has its own dedicated microprocessor continually sampling, analysing and adjusting the gain control. Below is a simple diagram of how it’s done.

This is the magic behind Fibre Lite and what makes the product range adjustment free without digitally encoding the video as is the case with our Fibre Pro range.

http://www.bfrdigital.co.za/fibrelite.html

Field-Lite Termination Enclosure

This is one very cool piece kit!!! 4 multimode video transmitters, 1 multimode data receiver with power supply and splice cassette in one field enclosure.
When I first designed the Fibre Pro Field Termination Enclosure (FIELD-ENC) I never thought it would be as popular as it is. This popularity has led to the DTX-Adaptor, which is an adaptor plate to accommodate the DTX Series equipment in the FIELD-ENC.

Now with the Fibre-Lite Field Termination Enclosure (FIELD-LITE), I took a completely different approach. As you can see, I designed this product to be modular. The base of this product is a motherboard which includes the power supply for the transmitter/receiver fibre optic modules; 4 output data channels to control PTZ cameras and a 12-way splice cassette. On to this motherboard, up to 5 multimode fibre optic modules can be plug-in. The modules could be 5 video transmitters OR it could be 4 video transmitters and 1 data receiver. The data from the data receiver is distributed and offers one output per video channel. All this is housed in a IP55, self-extinguishing plastic enclosure according to IEC60695-2-1 standards.

http://www.BFRDigital.co.za/

Calculating - Fibre Optic Power Budget

Calculating the Optical Power Budget for a fibre optic cable link is really simple. Firstly, we need to start with some known facts. The losses quoted below are the norm but you can obtain the cable and connector losses from your local cable manufacturer for a more accurate calculation.

Let’s look at the following example:

1. Calculate the Cable Loss
Cable loss = Cable Distance x Cable Loss per km
Cable loss = 2km x -2.5dB/km
Cable loss = -5dB

2. Calculate the Connector Loss
Connector Loss = Connector Quantity x Connector Loss
Connector Loss = 2 x -0.5dB
Connector Loss = -1dB

3. Calculate the Splice Loss
Splice Loss = Splice Quantity x Loss per Splice
Splice Loss = 2 x -0.2dB
Splice Loss = -0.4dB

4. Calculate the Total Link Losses
Total Link Losses = Cable Loss + Connector Loss + Splice Loss
Total Link Losses = -5dB + -1dB + -0.4dB
Total Link Losses = -6.4dB

We have now successfully completed the first part of the calculation and we have established that the total loss on this fibre optic link is -6.4dB. The second part of the calculation is even simpler because most manufacturers of fibre optic transmission equipment quote the Optical Power Budget in their spec sheets. For example the Optical Power Budget for the Fibre Lite Range of products is -12dB. Alternatively, we can calculate the Optical Power Budget:

Transmitter Output Power (LVTXD-010-SMM Fibre Lite) = -14dBm (quoted by the manufacturer)
Receiver Sensitivity (LVRXD-010-SMM Fibre Lite) = -26dBm (quoted by the manufacturer)

Optical Power Budget = Output Power - Receiver Sensitivity
Optical Power Budget = -14dBm - (-26dBm)
Optical Power Budget = 12dB

Power Margin = Optical Power Budget – Total Link Losses
Power Margin = 12dB + (-6.4dB)
Power Margin = 5.6dB

It is good practice to allow for a Power Margin of 3 dB. This allows for cable degradation and should you ever have the misfortune of having the cable damaged or cut you still have enough Budget to re-splice the cable.


www.BFRDigital.co.za

Fibre Lite

We at BFR Digital have just completed our Fibre Lite product range. This range of products caters for the transmission of CCTV video signals and unidirectional data signals over multimode fibre optic cable. Fibre Lite offers an optical budget of 12dB; which means a maximum cable distance of 2.5km and a system safety margin (excess power margin) of 3dB.

This product range is the first in its class to feature Digitally Controlled AGC; this feature automatically adjusts the AGC to compensate for optical cable degradation and other insertion losses. Each video receiving channel has it own dedicate processor that continuously samples and adjusts the AGC.

In true BFR Digital fashion the Fibre Lite range is designed to be robust and easy to use; for this reason the Fibre Lite range is offered with a 2 year warranty. We achieve this robustness and reliability by over engineering our products.

www.BFRDigital.co.za