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Model 4608 & 4808 e-Twinax Controller (eTwinax / e-Twin@x  / BX6058)
Support for up to 8 Twinax Addresses / Devices Over ANY IP Connection
to a Power10, Power9, Power8. Power7 & all iSeries AS/400

e-Twinax Controller - Model 4608 & 4808

Connect Up To 8 Twinax Devices Over IP to a New Power9, Power8, Power7 or Any iSeries AS/400 - Local or Remote

(Click here to see other eTwinax Models)

Please Note:  We offer the Model 4608 and 4808 as REFURBISHED products only.   If you would prefer a new controller with 3-year warranty we recommend the I-O Corporation Xip+ Twinax Controller.  Click here and you will be re-directed to the Xip+ Twinax Controller page.


The e-Twinax Controller is a "Twinax-to-IP" controller that can be used to connect Twinax devices to an IBM Power9, Power8, Power7 or any iSeries or AS/400 over any IP connection, locally or remotely.

The simplest way to look at the e-Twinax Controller is as an "External Twinax Workstation Controller".  You can even use your current IBM 8-port Twinax "Brick" on it as shown above.  Click on each photo of the eTwinax Controller for large images.

Some models also support an 8-port RJ45 "Brick".  Each RJ45 port is just like a Twinax Host Port with an RJ45 Balun on it.

When used remotely, it is a replacement for SDLC Remote Controllers such as the IBM 5494 and 5394, the Perle 594e, 494e and 394, and other IBM compatible Twinax controllers from I-O Corp., Decision Data and Idea.

It will support Twinax Display Stations and Twinax Printers (SCS and IPDS).

Being it uses TN5250e as it's communication protocol, it does not require any SNA protocols. In addition, it does not require DLSw (Data Link Switching) as IBM 5494s and other Twinax Controllers do.

Technical Specifications - 4608 & 4808 eTwinax Controller

Devices Supported


4608 - 8 Twinax Host Ports

4808 - 8 Twinax Host Ports
or 8 RJ45  Host
Each RJ45 Host Port is equivalent to a Twinax Port with a Twinax to RJ45 Balun installed
Each Host Port will support up to a maximum of 7 devices using any standard Twinax address (0, 1, 2, 3, 4, 5, 6) up to a maximum total of 8 devices/addresses across all 8 ports.


Partial List - 5251, 5291, 3179-2, 3180, 3196, 3197C, 3197D, 3476, 3477, 3486, 3487, 3488 and compatibles by CLI, Decision Data, I-O, Memorex-Telex, etc. (not all features are supported such as shared addressing, mouse support, imaging, etc.


SCS Printers - IBM 3812-1, 4214, 5219, 5224, 5225, 5256, 5262, 6262, 6400, 6500, Printronix P5000, P6000, P7000, P8000 and compatibles

IPDS Printers - IBM 3812-2, 4224, 4230, 4234, 4247, 6400, 6500, Printronix P5000, P6000, P7000, P8000 and compatibles

Other Printers - Most printers and printing devices such as thermal printers, card printers, etc. with built in Twinax interfaces or external Twinax interface protocol converters


Supports all PCs with Twinax 5250 emulation (TDLC) and BOS, CompuMaster, NLynx, IBM or IBM-compatible Emulation Cards

Host System Requirements

AS/400 Operating System

OS/400 V3R2 or higher

AS/400 Internal Features

AS/400 Ethernet LAN Connection


You can get more information by filling in the Information Request Form at the bottom of this page.

The diagrams below illustrates these Twinax Controllers fit in a local configuration as well as a remote "Cloud" configuration

Local Connection  - to provide connectivity of your local Twinax CRTs and Printers to an System i Power9, Power8, iSeries or AS/400 that does not have Twinax Workstation Controllers.  You can also use these two Twinax Controllers connected in this manner to provide full support of your Twinax Devices in a High Availability scenario.


Remote or "Cloud" Connection  - to provide TCP/IP connectivity for the Twinax CRTs and Printers at your remote locations that are currently connected to IBM 5494/5394, Perle 594/494 or other compatible Twinax Remote Controllers.  Also for supporting locations where you currently have an iSeries that will be eliminated when you upgrade to a more powerful i5 at your host location.

The diagram below illustrates typical Local and Cloud/Remote installations.  This diagram is using Twinax cabling.  The same information applies to installations using Active Star Twinax-to-RJ45 or RJ11 Hubs and Twinax to RJ45/RJ11 Balun connectors.

Ordering Information

All "ADD TO CART" models are currently in stock as of .
These prices are limited to our current inventory.



Please call us at 800-597-2525 or 1-908-688-8100 to discuss your application or if you have any questions.

Information Request Form

Model 4608 eTwinax Controller - 8 Twinax Address/Device Support

Please call us at 800-597-2525 or 1-908-688-8100 to discuss your application or if you have any questions.


Model 4608 / 4808 eTwinax Controller Information Request Form

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* Required

eTwinax Information Request - New 062218

RJ45 Host Port Option (e-TwinStar) Eliminates Need for Active Star Hubs

Rear view of e-TwinST@r Controller
with RJ45 unit attached

The e-Twinax Controller now has an optional model that includes a built-in unit featuring 8 (or 16) RJ45 sockets. Twinax devices working over CAT5 lines are connected directly to the Controller, saving the cost of an active star hub and eliminating the need for power sources and additional space in the communications closet, as well as the extra set-up and maintenance time.  The RJ45 Ports of this option operate just as a Twinax port with an RJ45 Balun attached to it.

If you need to connect more Twinax Devices than the number of physical ports on an e-Twinax Controller, please read the explanation in the next section.  The e-Twinax Controller model must be able to support the number of devices you need to connect.

The e-TwinStar (4800 Series) is available in models with support for 8, 16, 28, 56 or 112 Twinax addresses/devices.  The 4800 Series is fully upgradeable from one model to the next allowing for growth from 8 to a full 112 device support.  The 4800 Series also supports connection of the 8-Port Twinax Brick as the e-Twinax 4600 Series as well as the IBM 8-Port Twinax Brick from your existing Internal Twinax Workstation Controllers.

Upgrades are made by simple entering a new software key in the configuration section of the e-Twinax. You can upgrade remote locations by accessing the upgrade portion of the configuration over your WAN.  Upgrading is done while the controller is in full operation.  There is no need to have those users connected to it brought down.  This eliminates the need other controllers have to bring them down while increasing their device capacity or adding options.

Explanation of Device Support 
for the eTwinax and RJ45 Ports of e-Twinax Controller

As with the standard AS/400 8-port "Twinax Brick" from the Twinax Workstation Controller, each Host Port (Twinax or RJ45) of the e-Twinax will support up to a maximum number  of 7 device addresses (0, 1, 2, 3, 4, 5, 6), up to the maximum number of devices the particular model controller will support.  This convention holds true to all Twinax or RJ45 Host Ports of S/36, S/38, AS/400, iSeries and all IBM, Decision Data, I-O, Idea, and Perle Remote Controllers except for the very old 5251-12 and 5294 controllers that only supported a maximum of 4 addresses per Host Port.

For example, an IBM 5394-01B Controller has three Twinax Host Ports.  Three ports with 7 devices each would total 21.  The 5394-01B only supports 16.  You can distribute those 16 device addresses across those three ports however you see fit.  That could be 7 on the first port, 7 on the second port and 2 on the third port.  You could also have 6, 6 and 4 or any other combination that totals 16 device addresses with a maximum of 7 on any one port.

Another example is the 4616 (Twinax Host Ports) and 4816 (RJ45 Host Ports) of the e-Twinax Controllers.  Both of these models will support 16 Twinax addresses/devices but only have 8 physical ports.  Using the same logic as with the 5394-01B example, you can connect devices to ANY of these 8 ports as long as the total number of addresses used is 16 or less.  For example you could use the same 7, 7, and 2 on the first three Host Ports as with the 5394.  Being these models have 8 Host Ports, you could also put 2 devices on each port for a total of 16.  You could also have 4, 4, 4 and 4 on four of the 8 Host Ports or any other combination that totals 16 device addresses with a maximum of 7 on any one of the 8 ports.

If you need to connect more physical devices than the number of ports you have two options.

First, you can "cable-through" your Twinax devices from one to the next using actual Twinax cables.  Using this method you can connect up to 7 devices to a single Host Port.  If you are using multiple session terminals, the number of physical devices would be less as each Host Port will only support 7 addresses. 

Second, you can add a Twinax-to-RJ45 Active Star Hub such as the Gemini Express Active Star Hub to your setup.  These Active Star Hubs connect to one of the controllers Host Ports either by Twinax Cable or Category 5 (CAT5) cable, and expand the single port to 7 RJ45 ports corresponding with the device addresses available on that port of 0, 1, 2, 3, 4, 5, and 6.  This is the same whether the e-Twinax Controller has Twinax Host Ports or RJ45 Host Ports.  In this implementation each Twinax Device would be required to have a Twinax-to-RJ45 Balun on it to allow connection with a CAT5 cable.

The RJ45 Host Ports of the e-Twinax Controller are operationally the same as a Twinax Host Port with an RJ45 Balun attached to it.


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