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* TTL Logic to ST Fiber * Catalog #306766 - Model 6766 Interface Converter (Desktop)

    Fiber Interface Converter (Desktop)Fiber Interface Converter (Desktop)Fiber Interface Converter (Desktop)Fiber Interface Converter (Desktop)
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    • Fiber Interface Converter (Desktop)
    • Fiber Interface Converter (Desktop)
    • Fiber Interface Converter (Desktop)
    • Fiber Interface Converter (Desktop)
Base Price:
Catalog No: 306766
Model No: 6766
Product Type:Interface Converter
Converter Port Connector:ST
Conversion Type:Glass Fiber, TTL Logic
Speed:0 to 5 Mbps, Nominal
Wavelength Nano:820nm/850nm, multimode

  • Vih range: (3.3 - 5)Vdc      Voh Range (3.8-50)Vdc
  • Vil range: (0 - 1.5)Vdc       Vol Range (1-5)Vdc

Shipping Terms

Shipments are made via UPS Ground, unless otherwise specified. Freight charges are prepaid and added to your invoice. We can estimate the freight costs for you.

We can ship freight collect on your account, just provide your UPS Account Number.

We can also ship via the carrier of your choice. Provide the details and your account number.

Products shall be shipped F.O.B. Electro Standards' facility. Title to and risk of loss or damage to the products shall pass to you upon Electro Standards delivery of the products to a carrier for shipment. Title to software will remain with the applicable licensor. Electro Standards' prices do not include shipping and handling charges. Electro Standards reserves the right to use its own discretion in the manner and routing of shipments. Electro Standards shall be permitted to deliver products in separate lots.

Shipping Return Policy

  • To return an item, contact Electro Standards at 401-943-1164 to obtain a Return Material Authorization (RMA) number. RMA numbers are valid for 30 days after the date of the shipment and cannot be extended or re-issued. We are unable to accept returns without an RMA number.
  • All returns except those of defective product are subject to a 15% restocking fee, and additional charges for handling or freight are refunded only in cases of defective products.
  • Return freight must be shipped prepaid. We recommend that you insure the package as you are responsible for risk of loss on all returned packages. We recommend that all cartons are properly packed as Electro Standards is not responsible for product damaged en route. We do not issue call tags for product returns.
  • Returned product must be clean, undamaged, and complete with all manuals, accessories, documents and packaging. The items must be in a resalable condition.
  • The product must have with it a copy of the original invoice or packing slip and the appropriate RMA paperwork.
  • If your item is not working properly, please contact Electro Standards at 401-943-1164 for help in trouble-shooting your application.
  • If the product is defective, Electro Standards will repair or replace that item (at our discretion) upon receipt and evaluation of the original product.
  • Electro Standards reserves the right to authorize product returns after 30 days from the invoice date in some cases. If the product is accepted after 30 days, credit will be issued toward future pruchases only and some additional restocking charges may be applied.
  • All credits from RMAs must be used within one calendar year of issue.

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Interface Converters, TTL Logic-to-ST Fiber, Copper to Glass Fiber
Model 6766 Four Channel TTL Logic-to-ST Fiber Converter, Desktop

  • Converts TTL Logic signals to ST Fiber Optic signals.

  • Model 6766 desktop unit has screw terminal strips for easy connection of the copper logic signals.

Model 6766 Desktop Unit:

Copper/Glass Fiber Input/output Diagram:

TTL Logic Pair A, B, C and D convert signals to the ST Fiber Pair, A, B, C, and D.

  • Copper Interface:
    • (2) Terminal Strips, CH A, CH B, CH C, CH D
    • (2) Terminal Strips, Digital Ground
  • Glass Fiber Optic Interface: ST, Multimode, 820 nm on front panel
  • Optional jumpers are located on circuit board inside the Model 6766 enclosure.

Model 6766 Desktop Unit Four Channel TTL Logic-to-ST Fiber Converter Input/Output Diagram

Model 6766 Desktop Unit: Four Channel TTL Logic-to-ST Fiber Converter

 Model 6766 Desktop Unit Four Channel TTL Logic-to-ST Fiber Converter Block Diagram

 Model 6766 Desktop Unit: Four Channel TTL Logic-to-ST Duplex Fiber Converter

To view a Board version of this converter, click here or see Model 6765.


The Model 6766 is a high speed TTL digital logic level to fiber interface converter from Electro Standards Laboratories. It translates four input/output logic pairs into four fiber pairs, resulting in a total of eight fiber optic connections. Typical operating speeds are up to 5 Mbps.

Features include ESD protection on all copper interfaces, convenient ST fiber connectors, and logic test points that allow for signal monitoring. Provision for user selectable jumpers for fiber light ON/OFF polarity located on circuit board inside the Model 6766 enclosure.

The converter is also available as a circuit board convenient for embedded applications. See Model 6765, Cat. No. 306765.


Optical Interface:

  • TX Power: -17 dBm
  • RX Sensitivity: -27.5 dBm
  • Wavelength: 820 nm, multimode
  • Fiber Size: Accepts 50/125 micron, 62.5/125 micron, or 100/140 micron

Fiber Polarity:

  • Logical 0 = Light ON/OFF: User Selectable via Jumper
  • Logical 1 = Light ON/OFF: User Selectable via Jumper

Copper Interface: 

  • Type: TTL Logic
  • Vih range: (3.3 - 5)Vdc      Voh Range (3.8-50)Vdc
  • Vil range: (0 - 1.5)Vdc       Vol Range (1-5)Vdc
  • Bit Rate (nom.):
  • 0 to 5 Mbps, Nominal

Operating Environment:

  • 0° C to 70° C

Model 6766, Cat. No. 306766 Desktop Unit:

Copper Connectors: Copper Terminal Strips:

  • Terminal Strip: Channels TXA, TXB, TXC, TXD.
  • Terminal Strip: Channels RXA, RXB, RXC, RXD
  • Terminal Strips: Digital Ground, for each channel.

Glass Fiber Connectors:

  • (8) ST Connectors: RXA, TXA, RXB, TXB, RXC, TXC, RXD, TXD


  • Supply Voltage: (4.75 – 5.25) Vdc
  • Supply Current: 350 mA
  •  Power Supply Included (ESL PN: 521091)

Mechanical: Model 6766 / 306766 (Desktop Unit)

  • Size 8.38" W x 1.73" H x 8.0" D [21.9 x 4.6 x 22.9 cm]
  • Weight: 2.5 lbs (1.1 kg)

Optional DIN Rail Mounting Kit: Cat. No. 520418; Attaches to the bottom cover of the Model 6766 Fiber Interface Converter for applications requiring a DIN Rail.


Click here to view more of ESL's Media Converters:

Model 6765 board only and Model 6765 desktop unit Four Channel TTL Logic-to-ST Fiber Optic Converter

Electro Standards can supply all your Network Cable requirements. Click here to reach our FIBER OPTIC CABLES Webpage,  or our COPPER NETWORK CABLES Webpage.

For custom network switches call our friendly customer support staff at 401-943-1164, email eslab@electrostandards.com, or complete our online custom product request form.

All data switches, data communication products, and data acquisition products are subject to a one year warranty against manufacturing defects.  The limit of ESL liability is limited to the cost of the ESL product provided.

*Prices online are subject to change and verification.

All ESL products are available for export.

Electro Standards welcomes International inquiries: Convertisseurs d'interface, Interfaz de Convertidores, Convertitori di interfaccia, Mediakonwertery, Conversores de Interface.

Available Combo Deals