PassMark Software
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USB2.0 Loopback Plugs

High Quality Loopback Plugs for USB 2.0 Troubleshooting and Testing

USB 2.0 Loopback plugs are one of the fastest methods to diagnose, troubleshoot and load test your PC's USB functions.

When used with compatible PassMark testing software (see below) is it possible to:

  • Quickly check if a USB port is powered;
  • Check that data can be sent and received from the port;
  • Check USB errors rates and transmission speed (up to 480Mbits/sec) in Windows;
  • Measure the level of recovered data (retransmitted frames);
  • Verify that the system remains stable under long periods of load;
  • Test that USB support in Windows or Linux is available;
  • Test self powered USB hubs and PC ports function correctly;
  • Check USB cabling;
  • Concurrently check multiple USB ports at the same time;
  • Benchmark your PC's USB ports & hubs; and
  • Check if your PC ports are high speed 480Mbits/sec (USB 2.0), or full speed 12Mbits/sec (USB 1.x) via a LED
Quantity Price (AUD) incl. GST Ordering
1 - 4 $79.10 Add to cart
5 - 10 $71.20
11 or more $63.30

These prices do not include shipping and do not include the BurnInTest Professional software.

Active loopback plugs are the quickest, most effective way to verify that a PC's USB ports are working correctly. The Red, Green and Yellow LED's on the front of this USB adapter plug provide a quick visual indication of I/O activity and if the USB bus is powered. This will dramatically improve the troubleshooting and diagnostic ability of computer technicians and system integrators, who have previously been working blind.

In benchmark mode (Windows only), the device is capable of reaching the maximum defined transfer speed for USB2.0, 480Mbit/sec. Note: Testing has shown that most PC's can not attain speeds much above 300Mbits/sec and performance will vary depending on your motherboard, CPU and other USB devices connected to the PC.

Up to 10 of these USB test plugs can be simultaneously connected to a PC providing that free USB ports are available on the PC or on a down stream hub and sufficient power is available.

These plugs are unique! They are the only true USB 2.0 loop back adapters on the market and have been especially designed for use with our BurnInTest Professional, BurnIntest for Linux software package or USB2Test stand alone software (supplied with the plug). They do not require an external power supply and do not require a connection to any other port on a PC. Each plug also has its own serial number stored in EPROM, on the plug, so it is possible to identify each plug when multiple plugs are connected.

Each plug also contains its own CPU and executes its own firmware (which can be upgraded in the future by download) .

Size: 65mm x 50mm x 20mm (2.5 x 2.0 x 0.8 inches)
Weight: 60g (2.1oz)
Product Code: PM011

Technical Specifications

USB standard: 2.0 HighSpeed and FullSpeed
(and is backwardly compatible with USB 1.1 and 1.0)
Plug and play: Compliant
Physical connector: Standard 4 wire USB
(2 x Balanced Signal, 1 Voltage [VBUS], 1 Ground [GND])
USB Transfer modes: Bulk
Voltage: 4.4V - 5.25V. (No external power supply is required)
Current: 250mA (Theoretical Max), 60mA (Typical Operation)
Clock speed: 24Mhz
Device memory: 8KB
Case: High impact MABS plastic
Size: 65mm x 50mm x 20mm (2.5 x 2.0 x 0.8 inches)
Weight: 35g (1.3oz)
Indicators: Orange LED = USB2.0 (HighSpeed ) or USB1.0 (FullSpeed ) indicator
Green LED = Transmit data
Red LED 1 = Power from USB bus
Yellow LED = Receive data
Red LED 2 = USB bus transmission error indicator
EMC standards: AS/NZS 3548:1995, EC. See also FCC DoC
Storage Temperature: -20 ºC to + 70 ºC
Usage Temperature: 0 ºC to + 45ºC
Max speed: 480 Mbits/sec
Model number: PMUSB02 (rev2)
RoHS (Lead free) : Yes

The specifications above are for the PassMark USB 2.0 Loopback plug, hardware revision 2. For a list of the differences between the USB2.0 PMUSB02 (rev2) and the PMUSB02 (rev1) loopback plugs see the USB2 FAQ page.


A USB cable is included with each plug. The cable is a standard 40cm A-B USB cable. While just about any USB cable will work, it is best to use a quality high speed, shielded, USB cable when testing. Note that some of the cheaper USB cables are not shielded and thus are not recommended. The cable must be shorter than the 5m allowed in the USB standard. If a USB connection is required beyond 5m one or more hubs are required to extend a USB connection. We have noted during our testing that longer cables are more likely to have higher error rates.


WIN32: Windows XP SP3, 2003 Server, Vista, 2008 Server, Windows 7, and Windows 8 are supported.
WIN64: 64-bit Windows XP SP3, 64-bit 2003 Server, 64-bit Vista, 64-bit 2008 Server, 64-bit Windows 7, 8 and 10 are supported.
Linux: Kernel 2.6.9 or higher and LibUSB are required. Only the loopback funtions are supported (not benchmark functions).
Window 95, 98, ME, NT4, 2000 and Mac are not supported.

In order to use the plugs you also need at least one of the following 3 software applications.

A) BurnInTest Professional for Windows version 4.0 or higher, or
B) The free stand alone USB2Test software for Windows, or
C) BurnInTest for Linux version 2.0 or higher.

USB 2.0 and 1.1 ports are supported. (when connected to a USB 1.1 port only the lower speed, USB 1.1, mode will be used)
Plugs will work with motherboard USB ports and hub connected USB ports.

Windows Application Programming Interface (API)

The free USB2 Application Programming Interface has been designed to allow access by 3rd party programs to the PassMark USB 2.0 loop back plug. It provides several functions to communicate with the USB2 loop back plugs as an easy way to use the plugs without having to write any device driver or extra firmware code. For more information, please see this page.

Linux Application Programming Interface (API) Guide

We have developed a tutorial package which demonstrates how to use the library libusb to communicate with USB 2.0 Loopback plugs in Linux. Our guide package includes a manual plus some demonstration source code. For more information, please see this page.

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