24 Channel Video Fiber Optical Media Converters for surveillance system, With data RS485 
Transmitter/Receiver -1Pair, Single mode up to 20Km , 1U 19 inch Rack Mountable
High Quality / High Performance / MTBF (Mean Time Between Failure) Over  100,000 hours, Buy With Confidence!
Don't settle for Low Cost,Generic,Poor Quality/Not Quality Item Which Will Stop Working Within 1~12 months, Choose optimal,Choose us!
Default ship singlemode mode, if need multimode, leave us message after payment
For the environment:
1.      Security Systems
2.      Radio and television transmission
3.      Video monitoring
4.      Building control systems
5.      Train/High speed road monitoring
6.      Intelligent Traffic Monitoring System (ITS)
7.      Remote multimedia teaching / campus monitoring
8.      Long-distance radio and television transmission system
Video Index:
1.     Video : 24 channel.
2.     Video Interface: BNC.
3.     Video Input / Output Impedance : 75ohm ( unbalanced ) .
4.     Video Bandwidth 8MHz.
5.     Video format compatible PAL, NTSC, SECAM.
6.     Video voltage 1VP-P.
7.     Video SNR ≥ 70dB.
8.     Differential gain ≤ 0.7%.
9.     Differential phase ≤ 0.7 °.
10.   8- bit linear PCM coding.
11.   15MHZ high-speed sampling .
Optical index:
1.  Optical interface : FC
2.  Transmission distance : single-mode fiber 0-20KM. Multimode fiber 0~300Meters
3.  Wavelength : Single-mode 1310/1550μm (9/125μm), Multimode 850μm
50/125μm), 1310μm (62.5/125μm)
Data index:
1.  RS485 opposite direction (Function :control PTZ cameras)
2.  Terminal block connector.
General Index:
1.  The usual time between failures (MTBF) greater than 100,000 hours
2.  Operating temperature : -40  +70 degree
3.  Operating humidity :0 -95 % non-condensing
Package: 
1.  1x 24CH video data transmitter
2.  1x 24CH video data receiver
3.  2x Power adapter ( AC 100-240V universal, DC 12V output) 
4.  User manual
Shipping : We Ship to Worldwide, the items will be shipped within 1~2 business day after your full payment ! We ship it by DHL/FedEx/ARAMEX/EMS etc. 
Payment : Paypal 
Return Policy:
1. Refunds are only offered for defective products reported within 30 days upon receipt.
2. All returned items MUST BE in the original packaging and you MUST PROVIDE us with the shipping tracking number, specific reason for the return, and your po#.
3. We will replace your item if it is found to be defective within 30 days.
4. Buyer required paying for his own postage fees to return the item to us. Shipping and handling fees are non-refundable at any case.
5. Please contact us first by email before returning your item, because some solutions may not require returning your item. Returned item must be in new condition with all the accessories.
6. All warranties do not cover the damage due to misuse or compatibility.
7. We do our best to serve each and every customer the best we can.
Warranty and Guarantee:
1.Two years Warranty, Buy with confidence! 
2.If you find any defect for item in 3 months, we will send you a replacement without additional cost, or make refund after we receive the defective item.
3. If item is defective after 3 months, we can still accept that you send it back to us. A new one will be sent to you after we received the defective item, but you have to pay the extra shipping fee.
Other Policies:
1. We are not responsible for any custom duty or import tax.
2. After receiving the payment for item, we will leave POSITIVE FEEDBACK. If the item is not satisfactory to you when you received, please feel free to contact us.
3. All emails will be responded within 1 business day. If you do not receive our reply, we will reply to you upon receipt of your re-sent email as soon as possible.
4. Serious Buyer Only! Please place bid only if you agree with all the terms.