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Switch/Converter Catalog # 303173 - Model 4173 Fast Ethernet RJ45 to ST Duplex Fiber Optic, Ruggedized

    ST Duplex AB Switch/ConverterST Duplex AB Switch/ConverterST Duplex AB Switch/ConverterST Duplex AB Switch/Converter
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    • ST Duplex AB Switch/Converter
    • ST Duplex AB Switch/Converter
    • ST Duplex AB Switch/Converter
    • ST Duplex AB Switch/Converter
Base Price:
Catalog No: 303173
Model No: 4173
Product Type:Switches: Copper, Switches: Fiber Optic
Cable Type/Port Connector:RJ45, ST
Channels per Switch Chassis:1
Electronic Switches/Power Required:QuickSwitch® Fiber Optic
Remote Control:RS232 Serial
Compliance/Standards:MIL Spec
Fiber Mode:Multimode
Fiber Type:Duplex
Remote Port:DB9
Local Control:Pushbutton
Mirror Technology:OEO
Speed:100 Mbps
Wavelength Nano:1300

  • Built in fiber optic / copper medium conversion allows access 
    to two separate fiber optic ST ports (ports A and B) from a Fast Ethernet RJ45 port.

  • Ruggedized for vibration.

  • MIL type power connector.  Mating cable supplied with unit.





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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QuickSwitch® Fiber Optic Network Switch / Converter
QuickSwitch® 4173 ST Duplex A/B 100 Base FX - 100 Base TX Switch/Converter

  • Ruggedized for vibration environment.


  • PORT CONNECTORS: (2) ST Duplex female connectors labeled A, and B.
    • (1) RJ45 female 100 Base-TX connector labeled COMMON.
  • WAVELENGTH: 1300 nm.
  • FRONT PANEL CONTROL: (1) Manual pushbutton allows local switching.
  • DISPLAY: (2) Front panel LED's display switch position and power status.
  • REMOTE: (1) DB9 female connector on rear panel accepts RS232 Serial Data for Remote Control operation.
  • POWER: A six-foot power cable with MIL Bayonet locking circular connector is supplied with the unit.  Customer must supply 5VDC (Range 4.9 to 5.3 VDC) to this cable.  Current rating is 1.5 Amps.
  • DIMENSIONS: Desktop 7.5" W x 2.0" H x 7.0" D. (19.0 x 5.0 x 17.8 cm)
  • WEIGHT: 3.8 lbs  (1.7 kg) 


The diagram illustrates a COMMON device connected to the RJ45 100 Base TX Fast Ethernet COMMON port with access to two Fiber Optic Networks, each connected to the ST Fiber Optic 100 Base RX ports, converting and passing data to and from the 100 Base TX port. A DB9 Remote port can be used to control the switch / converter remotely using ASCII RS232 commands.

Model 4173 ST Duplex A/B 100Base FX to 100Base TX Switch Converter Application


  • Ruggedized-for-vibration version of the QuickSwitch® 4183.
  • See Model 4183 under Related Products tab.
  • Built in fiber optic / copper medium conversion allows access
  • to two separate fiber optic ST ports (ports A and B) from a
  • Fast Ethernet RJ45 port.
  • Front panel pushbutton changes the switch position eliminating
  • the need to plug and unplug fiber optic patchcords.
  • MIL type power connector.  Mating cable supplied with unit.
  • Switch position displayed on front panel LED's.
  • DB9/Female RS232 REMOTE port for Remote Control applications.
  • A & B port ST Duplex, 1300 nm, 100 Mbps multimode.
  • COM port RJ45 100-Base-TX.
  • Municipalities, schools, government: This product on GSA Schedule!


The QuickSwitch® 4173 ST Duplex A/B 100 Base FX to COMMON 100 Base TX switch allows the user the capability of accessing two separate fiber optic 100 Base FX ports from a 100 Base TX port.  The switch is fully compliant with the 802.3 micron 100 Base TX/FX standard.  The switch may be controlled manually via a front panel pushbutton or remotely from an RS232 Serial port located on the rear of the unit.  Switch position status may be attained via the front panel LED display or the Remote RS232 Serial port located on the rear of the unit.


100 Base FX A/B Ports:  Ports "A" and "B" are 1300nm, ST Duplex, Multimode, 100 Base FX fiber optic ports.  The selected fiber optic port will convert and pass data to and from the 100 Base TX common port.

100 Base TX Common Port: The RJ45 Female Common Port is a 100Base TX Fast Ethernet port.  The 100 Base TX "Common" port will convert and pass data to and from the selected 100 Base FX port "A" or "B".

Switch Control: The switch position may be controlled manually via a front panel pushbutton located on the front of the unit, or remotely from a remote RS-232 serial port located on the rear of the unit.  To switch manually simply press the front panel push button and the switch will change to the new selected position as indicated by the front panel LED's.  Remote switching of the unit is done through an RS-232 (DB-9) serial port located on the rear of the QuickSwitch® 4173, which may be connected to any standard RS-232 port on a computer.  The computer once connected to the Remote port may use any common terminal emulation software to access the Remote port on the QuickSwitch® 4173.

The QuickSwitch® Model 4173 is controlled manually via front panel pushbuttons. The switch position status and fiber optic link presence can be determined by the front panel LED's.

This high-quality network switch is available to city, state, and federal government purchasers at a discounted price and favorable payment and shipping terms via GSA Schedule GS-35F-0286V. Click here for GSA details.

Model 4173 is available to government purchasers on our GSA Schedule GS-35F-0286V. Call for discounted price and terms.


QuickSwitch® is a registered trademark of Electro Standards Laboratories.

QuickSwitch® Fiber Optic Switches are available in many configurations: auto fallback, switch/converters, multimode & single mode, and secure off-line positions. Check out our complete line of QuickSwitch® fiber optic switches.

For custom fiber optic network switches contact our friendly sales support staff at 401-943-1164; or email: eslab@electrostandards.com, or complete our online Custom Product Request form.

Electro Standards can supply all your Fiber Optic Cable requirements.

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.

All ESL products are available for export.

Electro Standards welcomes International inquiries: commutateurs à fibres optiques, interruptores de fibra óptica, switch in fibra ottica, switches de fibra óptica, fiberoptiska switcher.

*Prices online are subject to change and verification.

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