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Catalog # 309925 - Model 9925 4-Channel DB9/RJ45 Cat5 A/B Switch

    4-Channel DB9/RJ45 Cat5 A/B Switch4-Channel DB9/RJ45 Cat5 A/B Switch4-Channel DB9/RJ45 Cat5 A/B Switch4-Channel DB9/RJ45 Cat5 A/B Switch
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    • 4-Channel DB9/RJ45 Cat5 A/B Switch
    • 4-Channel DB9/RJ45 Cat5 A/B Switch
    • 4-Channel DB9/RJ45 Cat5 A/B Switch
    • 4-Channel DB9/RJ45 Cat5 A/B Switch
Base Price:
Catalog No: 309925
Model No: 9925
Product Type:Switches: Copper
Interface:DB9/RJ45 Cat 5
Cable Type/Port Connector:RJ45, DB9 Switch Ports
Channels per Switch Chassis:4
Manual Control/No Power Required:LineSelect® Manual Operation
Channel Control:Simultaneous Channel Control
Pins Switched:Pins 3,4,5,6,8 and all 8 pins of RJ45
Local Control:Rotary Knob


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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Multi Interface Copper Network Switches
Cat5 Manual Network Switch, RJ45, DB9
Model 9925 Four-Channel DB9/RJ45, Cat5 A/B Switch, Simultaneous Switching, Manual, Rackmount

  • Simultaneously switches DB9 and RJ45 Cat 5 Interfaces


    • (3) DB9 female connectors labeled A, B, and COMMON for each of three channels.
    • (3) RJ45 female connectors labeled A, B, and COMMON for the one RJ45 channel.
  • FRONT PANEL CONTROL: (1) Rotary switch on front panel selects A or B for all four channels.
  • POWER: No power required. Manually Operated
  • DIMENSIONS: Rackmount 19.0" W x 1.75" H x 8.68" D. (48.3 x 4.4 x 22.1 cm)
  • WEIGHT: Approximately 4.3 lbs. (2.0 kg)

LineSelect® Four-Channel DB9/RJ45 A/B Switch Application: (Simultaneously Switch all four Channels)

LineSelect® Model 9925 has (3) DB9 A/B Channels and (1) CAT5 RJ45 Channel of A/B Switching: 
The drawing illustrates three DB9 Channels with a COMMON device connected to the DB9 COMMON port with access to two devices connected to the DB9 A and B ports for each of three channels. 
The one RJ45 channel has a COMMON device connected to the COMMON port with access to two RJ45 devices connected to the A and B ports.
All four channels switch simultaneously from the A position to the B position or from the B position to the A position.

LineSelect® Model 9925 four channels; three DB9 and one Cat 5 RJ45 A/B Switch application


  • Allows quick connection to any one of two DB9 devices from one COMMON device for each of three channels.
  • Allows quick connection to any one of two RJ45 networks or devices from one COMMON device.
  • The RJ45 channel is certified for Cat5 compliance.
  • Manual operation via front-panel rotary switch. 
  • High quality sealed switch with self-wiping low impedance contacts.
  • Transparent to data speed and format.
  • Switches pins 3, 4, 5, 6, 8 of the DB9 interface via break-before-make rotary switch.
  • All 8 pins of the RJ45 interface are switched via break-before-make rotary switch.
  • Simultaneously switches all four channels via front-panel rotary switch.
  • Eliminates the need to plug and unplug cables.
  • No external power required.
  • Improves computer network efficiency by allowing sharing of peripherals. 
  • Custom length DB9 and RJ45 cables available for your switch installation.
  • Attractive all metal, black box packaging provides EMI/RFI shielding.
  • Lifetime warranty against manufacturing defects.

The LineSelect® Model 9925 Four-Channel DB9/RJ45, Cat5 A/B Switch allows the user to access two DB9 devices connected to its A and B ports with one DB9 device connected to its COMMON port for each of three DB9 channels. The fourth channel allows the user to access two Cat5 RJ45 networks or devices connected to its A and B ports with one device connected to the RJ45 COMMON port.  The unit is manually operated, requiring no power.  Port selection is quick and easy via a front panel rotary switch. The LineSelect® Model 9925 is enclosed in a 1U, all metal, black chassis designed to provide EMI/RFI shielding and fit in a 19' standard rack. 

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.

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