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Catalog # 307303 - Model 7303 DB25/X.21 BIS Interface A/B Switch, Rackmount

    DB25/X.21 BIS Interface A/B Switch, Rackmount
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Catalog No: 307303
Model No: 7303
Switch Media:Copper
Channels per Switch Chassis:1
Electronic Switches/Power Required:PathWay® Copper
Remote Control:RS232 Serial
Enclosure Configuration:Rackmount
Pins Switched:25
Remote Port:DB9
Local Control:Pushbutton


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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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Path Way® Remotely Controllable Network Switch, DB25/X.21
Model 7303 DB25/X.21 BIS Interface A/B Switch with Serial Remote Control, Rackmount

  • Switches Any DB25 Interface!

PathWay® Model 7303 DB25/X.21 BIS Interface with Serial Remote Control


  • PORT CONNECTORS: (3) DB25 (F) connectors labeled A, B, and COMMON.
  • FRONT PANEL CONTROL: (1) Manual pushbutton allows for local switching.
  • DISPLAY: (2) Front panel LED's display switch position and power status.
  • REMOTE CONTROL: (1) DB9(F) connector on rear panel accepts RS232 Serial Data for remote control operation.
  • POWER: UL approved 100VAC/240VAC, 50HZ/60Hz wall mount power module supplies 12VDC, 500mA to the unit.  Has 2-prong, US, non-polarized plug.
  • DIMENSIONS: Rackmount, 19" W x 1.75" H x 8.2" D. (43.3 x 4.5 x 20.9 cm)
  • WEIGHT: Approximately 4.3 lbs. (2.0 kg)

DB25/X.21 BIS INTERFACE APPLICATION w/RS232 SERIAL REMOTE: The drawing illustrates a DB25/X.21 interface COMMON device connected to the DB25 COMMON port with access two DB25/X.21 BIS Interface Devices connected to the DB25 interface ports labeled A and B. A DB9 REMOTE control port can be used to remotely control the switch via RS232 ASCII commands, such as control switch position, lockout front panel operations, set pushbutton duration, and obtain switch status.

PathWay® Model 7303 Application for DB25 / X.21 BIS Interface A/B Switch with RS232 Remote 


  • Allows quick connection to any one of two DB25/X.21 BIS Interface devices from one COMMON port.
  • The switch ports are transparent to all data.
  • All (25) pins of the DB25 interface are switched via break-before-make electromechanical relays.
  • The unit maintains last set position on power loss and continues to pass data.
  • Front panel pushbutton control.
  • Remote RS232 ASCII Commands that allow the user to control switch position, lockout front panel operations, set pushbutton duration, and obtain switch status.
  • Pushbutton operation requires pushbutton to be held for a configurable amount of time.
  • Front panel LED's display present position and power status.
  • Eliminates the need to plug and unplug cables.
  • Attractive all metal black box packaging provides EMI/RFI shielding.
  • Custom length DB25 cables available for your switch installation.  

The PathWay® Model 7303 Single Channel DB25/X.21 BIS Interface A/B switch allows the user the capability of sharing a single port interface device connected to the Common port, among two other devices connected to the A and B ports, with remote access functionality. The Model 7303 is enclosed in a 1U, full rack size, all metal chassis designed to fit in a standard 19" rack.

The switch may be controlled locally by manually operating the front panel pushbutton or remotely from a DB9 (female) Serial Interface Remote port located on the rear of the unit.  The user may set Duration period which will require the operator to hold down the pushbutton for a period of time in order to change the switch position.  If the pushbutton is released prior to the Duration period, the unit will not change position.  The front panel LED dispaly indicates the switch position and unit power status.  All connections are switched simultaneously for a total of 25 pins switched.

(Cat No. 517277) CE, RoHS, and UL listed table mount power module, 100VAC/240VAC, 50/60Hz for use in place of the standard power module that is included with the unit.  Has IEC 60320 C14 inlet, Ideal for international applications.

Electro Standards can supply all of 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 switch boxes, 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.

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