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Catalog # 305861 - Model 9021 Coaxial BNC A/B Switch, Modular Design

    LineSelect® 9021 Coaxial BNC A/BLineSelect® 9021 Coaxial BNC A/BLineSelect® 9021 Coaxial BNC A/BLineSelect® 9021 Coaxial BNC A/BLineSelect® 9021 Coaxial BNC A/B
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    • LineSelect® 9021 Coaxial BNC A/B
    • LineSelect® 9021 Coaxial BNC A/B
    • LineSelect® 9021 Coaxial BNC A/B
    • LineSelect® 9021 Coaxial BNC A/B
    • LineSelect® 9021 Coaxial BNC A/B
Base Price:
Catalog No: 305861
Model No: 9021
Product Type:Switches: Copper
Cable Type/Port Connector:Coax Switch Ports
Channels per Switch Chassis:1
Manual Control/No Power Required:LineSelect® Manual Operation
Feature:Modular Design for System Expansion


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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Manual Network Switch, BNC Coaxial
LineSelect® Model 9021 Single Channel Coaxial BNC A/B Switch Module, Rackmount

  • High Quality Manual Data Network Switches Increase the Reliability of Your Network.

  • Modular approach allows system expansion to meet your needs.


  • PORT CONNECTORS: (3) BNC connectors labeled A, B, and COMMON.
  • FRONT PANEL CONTROL: (1) Manual rotary switch on front panel selects A or B.
  • POWER: No power required. Manually Operated.
  • DIMENSIONS: Module 1.98" W x 5.06" H. x 7.85" D. (5.1 x 12.9 x 20.0 cm)
  • WEIGHT: Approximately 0.7 lb. (0.4 kg)

LineSelect® Model 9021 Coaxial BNC A/B Switch Application:

The drawing illustrates a COMMON device connected to the BNC COMMON port with access to other BNC interface devices connected to the BNC port "A" and BNC port "B". This single channel BNC A/B switch can become up to eight channels by installing eight individual switch modules into the Model 9025 rack mount chassis.

LinesSelect® Model 9021 Single Channel Coaxial BNC A/B Switch Module Application Drawing


  • Allows quick connection to any one of two devices from one COMMON device.
  • Manual operation via front-panel rotary switch.
  • Switches both the shield and center conductor of the coaxial interface via break-before-make rotary switch. 
  • High quality sealed switch with self-wiping low impedance contacts.
  • The switch ports are transparent to all data.
  • No external power required. Manual operation.
  • Switch case is a rugged all-aluminum enclosure for EMI/RFI protection.
  • Up to eight LineSelect® Model 9021 Switch Modules can be housed in the Model 9025 Rack Chassis.
  • Lifetime warranty against manufacturing defects.
  • Modular approach to switch requirements allows expansion to more channels on an as-needed basis.

The LineSelect® Model 9021 switch module allows the user to switch a device connected to the COMMON port between devices connected to ports A and B.  The LineSelect® Model 9021 is an open frame module designed to be installed in the Model 9025 Rack. The Model 9025 is a 3U full rack size chassis designed to fit in a standard 19" rack.

Model 9025 Rackmount Chassis for Switch Modules (Cat No 305972) Features:

  • Rack can accommodate up to eight Model 9021 A/B modules (2.0" W).
  • Rackmount chassis supports multiple switch module chassis of various widths.
  • Rack Size: 19" W x 5.25" H x 7" D. (48.3 x 13.3 x 17.8 cm)
  • Full opening for modules is 16.8" W. (42.7 cm)

Model 9025 Rack Chassis illustrated with a 2" filler panel Model 9008 and Module Guides. Other filler panel sizes are available!


  • Module rack filler panel, 2.0" W, Cat No 305983 - Model 9008.
  • Module rack filler panel, 0.8" W, Cat No 305981 - Model 9011.
  • Other filler sizes available.

Custom length BNC cables are available for your switch installation.

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

For custom network switches call our friendly customer support staff at 401-943-1164, email eslab@electrostandards.com, or complete our online form: /Products-Custom/Copper-Switch/

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: commutateur d'ordinateur,  equipo interruptor, interruttore del calcolatore, interruptor do computador, dator switch.

Available Combo Deals