Yes—multi-TT USB 2.0 hubs can perform better when multiple USB 1.x devices are active at the same time. A multi-TT hub gives each downstream port its own transaction translator; a single-TT hub makes classic-speed devices share one. That can reduce contention between full-speed (12 Mbps) and low-speed (1.5 Mbps) devices, but it does not add bandwidth to the hub’s shared 480 Mbps upstream connection.
What does a transaction translator do?
A USB 2.0 high-speed hub connects to the host over USB’s 480 Mbps high-speed link. When a full-speed or low-speed device is attached, the hub’s transaction translator (TT) converts between the host’s high-speed traffic and the slower device’s USB traffic. USB 2.0 uses split transactions for this work: the host can schedule other high-speed activity while a slower operation completes. Infineon’s application note explains this scheduling model.
Single-TT and multi-TT compared
| Hub mode | Translator arrangement | Effect on full-/low-speed devices |
|---|---|---|
| Single-TT | One translator is shared across downstream ports. | Classic-speed devices contend for the same translated path. |
| Multi-TT | Each downstream port has its own translator and buffers. | Classic-speed transactions on separate ports can be handled in parallel. |
In Infineon’s terminology, these arrangements are also called TT/Hub (single-TT) and TT/Port (multi-TT). The distinction matters for full- and low-speed devices; it is not a way to make high-speed devices faster.
When does multi-TT improve performance?
The difference is most relevant when several full-speed or low-speed peripherals transfer data concurrently—for example, multiple USB 1.x audio, input, serial, or other classic-speed devices. Separate translators can overlap work that would otherwise queue behind a shared translator. With only one active full-/low-speed device, or with only high-speed devices, a second translator has little or no classic-speed contention to relieve.
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Infineon states that the theoretical maximum bandwidth for classic-speed devices is 12 Mbps multiplied by the number of enabled TTs. This is a ceiling, not a prediction of application throughput: USB framing, split-transaction scheduling, host-controller behavior, device endpoint limits, and competition for the shared upstream link all constrain delivered performance. Multi-TT does not create separate 480 Mbps links.
How to tell whether a hub is multi-TT
Do not infer multi-TT capability from “USB 2.0” alone. The product listing or documentation should explicitly identify multi-TT or MTT. A hub’s implementation and host behavior also matter: a host can force single-TT operation even when the hub controller supports a translator per port. For example, Microchip’s USB2504/USB2504A datasheet describes selecting either one shared TT or a dedicated TT for each port, while noting that the host may force single-TT mode.
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For USB descriptors, Microsoft documents bDeviceProtocol value 0x01 for single-TT and 0x02 for multi-TT. The interface descriptor’s bInterfaceProtocol also distinguishes the modes. Microsoft says Windows’ Usbhub.sys enables multi-TT mode when a hub reports multi-TT capability. See Microsoft’s USB 2.0 hub features documentation.
Quick Recap
Best Value
- Port Expansion Capability: Expand by connecting up to 4 USB 2.0, or 1.1 devices to any USB 2.0 capable computer
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- High-Speed Data Transfer: Supports USB 2.0 transfer rates up to 480 Mbps. Backwards compatible with 1.1 devices and hosts
- Reverse Compatibility: Reverse Compatible with USB 1.1 devices and hosts for seamless connectivity with older peripherals
- Power Limitation Notice: Charging NOT supported. Devices connected must not exceed a combined current of 5 volts 500mAh
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- Easily to Use, Wide Compatibility: The usb 3.0 extender hub no software/app required,Plug and PLay,instantly connecting your usb devices on PC.Nice choice for someone who needs to connect multiple usb devices on their computer.(USB fan, card reader,usb disk,etc.) The USB splitter also compatible with Windows 10/8/8.1/7 / Vista / XP and Mac OS X, Linux, Chrome OS
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- [Compact and Portable Splitter] The multi-port USB extension is the ideal tool for working and traveling with an ultrabook because of its clever design, which aims to be as light and thin as possible.
- [Wide Compatibility] This 4-port USB hub is compatible with PCs, Windows 10, 8, 7, Vista, XP, Mac OS 10.6-10.12 or later, and Linux 2.6.14 or later.
Which type should you choose?
- Choose multi-TT if several full-speed or low-speed peripherals are likely to be active together and the hub and host support multi-TT operation.
- Single-TT may be sufficient if your attached devices are all high-speed, or if only one full-/low-speed device will be active at a time.
- Check the exact model for an explicit multi-TT/MTT specification. Port count, power capability, and price are product-specific; USB 2.0 branding alone does not establish any of them.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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