401-943-1164 / US & Canada Toll Free: 877-943-1164

308399 Model 8399 KVM A/OFFLINE/B Switch, with Mounting Brackets

    KVM A/OFFLINE/B Switch
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Base Price:
Catalog No: 308399
Model No: 8399
Product Type:Switches: Copper
Positions:3, Offline
Cable Type/Port Connector:HD15 Switch Ports
Channels per Switch Chassis:1
Manual Control/No Power Required:LineSelect® Manual Operation
Security:Offline Position
Local Control:Rotary Knob
Feature:Mounting Brackets


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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KVM Manual Network Switch
Model 8399 PS/2 Keyboard, VGA Monitor & PS/2 Mouse A/Offline/B Manual Data Network Switch

  • Ruggedized configuration includes mounting brackets.

  • Absolutely NO data passes through the switch when in the OFFLINE position!


  • Port Connectors:
    • (3) HD15 (F) connectors (VGA Monitor Interface) labeled A, B, and COM
    • (3) 6-Pin MiniDIN (F) connectors (Keyboard Interface)
    • (3) 6-Pin MiniDIN (F) connectors (PS/2 Mouse).
  • Front Panel Control: (1) Rotary Knob selects A, OFFLINE, or B position.
  • Power: No power required. Manually operated.
  • Dimensions:
    • 5.24" W x 2.02" H x 7.79" D (13.3 x 5.2 x 19.8 cm) (Without Brackets)
    • 7.24" W x 2.02" H x 7.79" D (18.4 x 5.2 x 19.8 cm) (With Brackets)
  • Weight: 1.5 lbs. (0.7 kg)
  • Included: mounting brackets.

Model 8399 PS/2 Keyboard, VGA Monitor & PS/2 Mouse A/OFFLINE/B APPLICATION:

The drawing illustrates a computer connected to the COMMON KVM with access to KVM "A" and KVM "B", connected to the KVM A and KVM B ports. There are three positions for this unit, Position A, Position OFFLINE, and Position B. The OFFLINE position is the center position. 

Network Application Diagram for Model 8399 KVM Switch with Offline position


  • Allows quick connection to any one of two KVM devices from one COMMON KVM device.
  • Manual operation via front-panel rotary switch.
  • In A and B position, all signal pins of all connectors are switched.
  • Offline position located in center position.
  • Offline position shorts pins 3 and 4 of the 6-Pin Mini-Din COMMON port connectors.
  • The switch ports are transparent to all data.
  • High quality sealed switch with self-wiping precious metal contacts.
  • Eliminates the need to plug and unplug cables.
  • No external power required.
  • Includes mounting brackets.
  • Attractive all metal black, box packaging provides EMI/RFI shielding.
  • Custom length KVM cables available for your switch installation.  Get better network performance!
  • Lifetime warranty against manufacturing defects.

The LineSelect® Model 8399 PS/2 Keyboard, Monitor and Mouse A/OFFLINE/B Switch is designed to allow access from one PS/2 computer to two locations having a keyboard, monitor, and mouse.

Alternately, the LineSelect® Model 8399 can also be used where two PS/2 computers need to be shared among one keyboard, monitor, and mouse location.  A front panel selector allows quick and easy switching of the shared device.

State cable length (in Feet) when ordering.

Part Number          Description

880841           VGA Monitor Cable, HD15 (M/M)

891022           VGA Extension Cable HD15 (M/F)

880835           PS/2 Keyboard/Mouse/Extension Cable, Mini DIN-6 (M/M)

891021           PS/2 Keyboard/Mouse/Extension Cable, Mini DIN-6 (M/F)

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