401-943-1164 / US & Canada Toll Free: 877-943-1164

306765 - 6765 TTL Logic to ST Fiber Interface Converter (Board)

    Fiber Interface Converter (Board)Fiber Interface Converter (Board)
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    • Fiber Interface Converter (Board)
    • Fiber Interface Converter (Board)
Base Price:
Catalog No: 306765
Model No: 6765
Product Type:Interface Converter
Converter Port Connector:ST
Conversion Type:Glass Fiber, TTL Logic
Speed:Up to 5 Mbps
Wavelength Nano:820nm/850nm, multimode


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 6765 Four Channel TTL Logic-to-ST Fiber Converter, Board Unit

  • Converts TTL Logic signals to ST Fiber Optic signals.

  • Ideal for Commercial-Off-The-Shelf (COTS) purchase applications.

Model 6765 Board 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.

Model 6765 Board Unit Four Channel TTL Logic to ST Fiber Converter Input/Output Diagram

Model 6766 TT Logic-to-ST Fiber, Copper to Glass Application

 Model 6765 Desktop Unit Four Channel TTL Logic to ST Fiber Converter Block Diagram

 Model 6765 Board Unit

To view a Desktop version of this converter, click here or see Model 6766.


The Model 6765 is a high-speed 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 user selectable fiber light ON/OFF polarity, convenient ST fiber connectors, and logic test points available for signal monitoring.

The unit is powered from 5 VDC. The power supply input is protected from overvoltage, overcurrent. All TTL copper connections feature advanced ESD protection of ±8kV contact discharge, ±15kV air discharge, (IEC61000-4-2).


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      Voh Range (.1-.5) Vdc
  • Bit Rate (nom.):
  • 0 to 5 Mbps, Nominal

Operating Environment:

  • 0° C to 70° C

Model 6765, Cat. No. 306765 Board Unit:

Copper Connectors: Copper Terminal Strips:

  • Copper I/O: (1) 14-Pin 0.1 x 0.1 Male Header
  • Test Points on Board: For monitoring purposes

Glass Fiber Connectors:

  • (8) ST Connectors: (4) RX (4) TX


  • Supply Voltage: (4.75 – 5.25) Vdc


  • Size 6.45" W x 3.0" L x 0.55" H
  • Weight: 2.6 oz (74 g)
  • Mounting: 4 Mounting Holes

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

Model 6765 is available to government purchasers on our GSA Schedule GS-35F-0286V. Call for discounted price and terms.

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