4 SDI / HDSDI Over 1 Fiber MINI Extender

Qty: 5
Price: $ 2,495.00
Availability: In stock Condition: new
Shipping: starting at $22.00 Warranty: 1Yrs
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Description Features Drawings Model Selection Specification Q&A Documents Support

4 Ch Mini HD-SDI Over Fiber Optic Extender

Extend four HD-SDI or SD-SDI digital video signals long distances over single-mode fiber optic cable

The Thor SDI to Fiber F-M4SDI-TxRx kit is a compact power house that will allow any user to transport four channels of 1.485Gbps HD-SDI Serial Data Interface over a single strand of fiber. Furthermore, this HD SDI over Fiber Kit of Transmitter and Receiver will send RS485 in reverse for easy control over the kit. This sturdy Fiber Extender creates an easy drop environment for users that require multiple HD-SDI sources on one Fiber across any application and even allows additional AUX Cards which can allow a plethora of other options such as RS232 and RS422, and even capable of carrying external analog audio instead of the SDI embedded audio. Thor Fiber has an excellent reputation as a Manufacturer of high quality and low cost price products to help complete your project on time, in a loss free high quality kit that will ensure you stay under budget. Our Fiber Optic Extender is Commonly used in security applications, live performance environments, video surveillance, SDI distribution and control in any environment. Our Unit supports 20km on a single mode and multimode fiber up to 3000 ft. This unit is an SDI over Fiber multiplexer and SDI over Fiber demultiplexer.


Locking Cables

ST or FC or SC fiber & BNC connectors make sure that the cable is not accidentally pulled out of the equipment 






No Link Alarms

Link status alarm on both the transmitter and receiver indicate when the link is not functional.

Serial Data

RS-485 return path sends serial data from the receiver back to the transmitter for device control.

  • Supports 4 Full HD-SDI @ 1.5Gbps or lower SDI or ASI digital video
  • Transports embedded audio channels as well as SDI ancillary data
  • Return path serial RS-485 channel for controlling equipment on Tx end
  • Link alarm indicators on both Tx & Rx indicate a problem with the fiber
Model Selection

Addition Available Cards :
(External Analog Audio, 10/100 Ethernet, Gigabit Ethernet, RS422, RS232) (add $)

  • 2 forward contact closure + Embedded audio
  • 2 backward contact closure + Embedded audio
  • 1 bidirectional RS422+Embedded audio
  • 2 bidirectional RS232+Embedded audio
  • 2 external bidirectional audio
  • 4 external forward audio
  • 4 external backward audio - Embedded audio   
  • 10/100 Ethernet (full-duplex )  
  • Gigabit Ethernet  (full-duplex ) -CWDM version only

Additional Model Selection :


XX = Optical connector : SC/PC , FC/PC (same price)
 YY = Fiber optic distance 40,60,80,100,120Km (add $)
ZZ = (MM) Multi-mode, (SM) Single-mode (same price)
  • update to 3G SDI

3G SDI supprted up to 3Gbps (add $)

Avialable on 4 CHannel CWDM F-4SDI-TX/RX unit

Addition Available  AUX Cards:  - (External Analog Audio, 10/100 Ethernet, Gigabit Ethernet, RS422, RS232) (add $)

AUX cards selection:



1-channel bidirectional RS422




2-channel bidirectional RS232




2-channel bidirectional audio




2-channel unidirectional audio output



2-channel unidirectional audio input



4-channel unidirectional audio input



4-channel unidirectional audio output



2-channel contact closure input



2-channel contact closure output





  • HD-SDI Input

HD-SDI, SD-SDI, or (DVB-ASI avialable on F-4ASI-TX/RX only)

0 - 1.5 Gbps Serial Digital Signal (3G optional)

  • Number of Input
 4 SDI
 1 RS-485
 1 Auxiliary 
  • Signal Level
> 380mVp-p
  • Impedance
  • Connector
  • Distance
20Km (40,60,100Km -optional)
  • Mini box
  • Power Supply
 130 - 260 VAC @ 50-60 Hz
  • Power Consumption
  • Temperature
 0 to +70 Degree
  • Humidity
0 to 95%
  • Connector
standard : ST/PC  and ( FC/APC or SC/PC optional)
  • Optical Channels
TDM type 
  • RH
  • LED Status Indic


Power / Link

 *All Specifiactions Subject to Change Without Notice

Question and Answers
So the main difference is the multiplexing technology CWDM vs. TDM. The compact units utilize one laser to transmit the videos using TDM, which is a compression multiplexing method using time delay, and can result in very low signal delays up to 20ms. TDM is only Capable of transmitting up to HD-SDI 1.485Gbps. https://thorbroadcast.com/products/sdi-1 The CWDM units are uncompressed, utilize a laser per input source, and can go up to 3G-SDI with zero loss and delay. So the 4SDI Transmitter uses 4 lasers, which are then multiplexed via CWDM. These units are only made in rack mount chassis to accommodate the necessary internal hardware. Companies like NASA and the NHL use these models. https://thorbroadcast.com/products/sdi-sd-hd-3g-with-cwdm
Similar products:

HDMI Fiber Extender with IR

Inexpensive HDMI over fiber transmitter and receiver set. It transports uncompressed HDMI Video/ Audio signal up to 20Km over single mode fiber or up to 3000 feet over multimode fiber.

4 HD-SDI + 10/100 Ethernet +RS485 + Audio over single fiber TX/RX with Aux

The F-M4SDI-ET-TxRx is a 4-channel SD/HD-SDI video and 1x 10/100 Bi-directional data transceiver over single fiber which performs in real-time, for high-quality video transmission over a single optical fiber. Provides one 10/100Mb/s Fast Ethernet (data transmission) which can be widely used in TV live broadcast, high-definition video conferencing, high-definition video monitoring In addition it also transports RS485 and has availability for an Aux Card (purchased separately).

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