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Catalog 307124 Model 7124 DB9 A/B Automatic Fallback Switch

    DB9 A/B Automatic Fallback SwitchDB9 A/B Automatic Fallback SwitchDB9 A/B Automatic Fallback SwitchDB9 A/B Automatic Fallback Switch
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    • DB9 A/B Automatic Fallback Switch
    • DB9 A/B Automatic Fallback Switch
    • DB9 A/B Automatic Fallback Switch
    • DB9 A/B Automatic Fallback Switch
Base Price:
Catalog No: 307124
Model No: 7124
Product Type:Switches: Copper
Cable Type/Port Connector:DB9 Switch Ports
Channels per Switch Chassis:1
Electronic Switches/Power Required:PathWay® Copper
Remote Control:Auto Fallback, Contact Closure
Auto Fallback:Auto-Switch logic, Data Monitor Port A
Pins Switched:9
Remote Port:DB9
Local Control:Pushbutton
Protocol:Data Loss on "A"


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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, DB9, Auto Fallback
Model 7124 DB9 A/B Automatic Fallback Switch, with Contact Closure Remote Port

  • Automatic fallback based on loss of data on port "A".

  • Data activity "Watch Dog" switch keeps data flowing.

  • Double the data throughput reliability through Auto-Fallback redundancy!


  • PORT CONNECTORS: (2) DB9 female connectors labeled A and B, (1) DB9 male connector labeled COMMON.
  • FRONT PANEL CONTROL: (1) Manual pushbutton allows local switching.
  • DISPLAY: (2) Front panel LED's display switch position, mode and power status.
  • REMOTE: (1) DB9 (F) connector on rear panel accepts Contact Closure switch commands for Remote Control Operation.
  • POWER: UL approved 100VAC/240VAC, 50Hz/60Hz wall mount power module supplies 12 VDC, 500 mA to the unit. Has 2-prong, US, non-polarized plug.
  • DIMENSIONS: 19.0" W x 1.75" H x 8.0" W.  (48.3 x 4.4 x 20.3 cm)
  • WEIGHT: Approximately 4.3 lb. (2.0 kg).


The drawing illustrates a COMMON Device connected to the DB9 male COMMON port with access to two devices connected to two DB9 female ports, "A" and "B", respectively. Port "A" is monitored for data activity. On loss of data activity on Port "A", unit automatically switches to Port "B".  A DB9 female REMOTE port accepts Contact Closure signaling for Remote Operation or to override Automatic Fallback operation.

PathWay® Model 7124 DB9 Automatic Fallback Application


  • Allows quick connection to any one of two DB9 interface devices from one COMMON DB9 interface device.
  • The switch ports are transparent to all data.
  • All (9) pins of the DB9 interface are switched via break-before-make electromechanical relays.
  • Retains last switch position in the event of a power loss and continues to pass data.
  • Front panel pushbutton control.
  • Ideal for automatic fallback applications based on Port "A" data activity.
  • Automatic Fallback Mode operates based on data monitoring of pin 3 of the "A" port and automatic switching occurs after 3 seconds of data loss.
  • Auto-switch logic: If activity on Port "A", stay on Port "A"; if data activity is lost from Port "A", switch to Port "B".
  • Remote control port allows control of the switch position, lockout front panel operations and obtain switch status via Contact Closure signaling.
  • Front panel LED's display switch position, and power status.
  • Attractive all metal black box packaging provides EMI/RFI shielding.
  • Custom length DB9 cables available for your switch installation.
  • Municipalities, schools, government: This product is on GSA Schedule!

The PathWay® Model 7124 DB9 A/B Automatic Fallback switch with Contact Closure Remote Port 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 control access functionality.

Remote Control access can be accomplished through the Contact Closure Remote port. The Model 7124 is enclosed in a 1U, full rack size, all metal black chassis designed to provide EMI/RFI shielding and fit in a standard 19" rack.

When in Automatic Fallback Mode, the unit monitors data activity on the Port "A". If activity is lost, the unit switches to Port "B". The Model 7124 will maintain its connection to Port "B" until data activity is detected on Port "A", at which time the unit will automatically return to the "A" position. If no data is present on either Port "A" or Port "B", the unit will stay in the "B" position and continue to monitor for data. The user can override Automatic Fallback operation from the front panel or from the Remote port and force the unit to operate as an A/B Switch. 


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

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 7124 is available to government purchasers on our GSA Schedule GS-35F-0286V. Call for discounted price and terms.

Custom length cables are available for quick delivery!

Suggested cables for use with Model 7124 Switch:
Part Number    Description                                                                 
990125-005      DB9 M/F, 9-Conductor, Unshielded PVC Cable, 5 FT
990125-010      DB9 M/F, 9-Conductor, Unshielded PVC Cable, 10 FT
990126-005      DB9 M/M, 9-Conductor, Unshielded PVC Cable, 5 FT
990126-010      DB9 M/M, 9-Conductor, Unshielded PVC Cable, 10 FT

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.

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Electro Standards welcomes International inquiries: commutateur d'ordinateur,  equipo interruptor, interruttore del calcolatore, interruptor do computador, dator switch.

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