What are the requirements for USB 2.0 (EHCI) support on PCoIP Zero Clients?

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February 23, 2022

Last modified: 09/03/2023, 6:11 pm

Knowledge Base Article Advisory Peripheral Devices Remote Workstation Card Zero Clients

EHCI (Enhanced Host Controller Interface) is a high-speed controller standard that is publicly documented and provides high speed USB functionality.

Tera2 based PCoIP Clients support USB 2.0 (EHCI) out of the box on all firmware releases.

The requirements for USB 2.0 (EHCI) support on TERA1100-based PCoIP Zero Clients include:

Notes:

Isochronous USB 2.0 video devices will continue operation in USB 1.1 mode when connected directly to a PCoIP Zero Client root port
Isochronous USB 2.0 video devices connected through an internal/external USB hub are not supported and may see the following error message; USB device not supported behind a high-speed hub.
Optimal transfer speeds are achieved on connections that have minimal latency

Tera 2 with EHCI Disabled (Devices operate in USB 1.1 mode only)
	Root Port		Behind USB 1.1 and 2.0 Hub
View Desktop	All devices operate in USB 1.1 mode		All devices operate in USB 1.1 mode
PCoIP Remote Workstation Card	The EHCI Disable flag does not apply to the PCoIP host card. See following section for PCoIP host card behaviour.		The EHCI Disable flag does not apply to the PCoIP host card. See following section for PCoIP host card behaviour.
Tera 2 with EHCI Enabled (USB 2.0 support is enabled)
	Root Port	Behind USB 1.1 Hub		Behind USB 2.0 Hub
View Desktop	All devices operate in their native mode USB 1.1 or USB 2.0) except USB 2.0 isochronous video devices, web, cams). USB 2.0 isochronous video devices* operate in USB 1.1 mode.	All devices operate in USB 1.1 mode		All non-isochronous devices operate in their native mode (USB 1.1 or USB 2.0). Isochronous video devices are not supported (a warning overlay may appear).
PCoIP Remote Workstation Card	All devices operate in their native mode USB 1.1 or USB 2.0) except USB 2.0 isochronous video devices, web, cams). USB 2.0 isochronous video devices*operate in USB 1.1 mode.	All devices operate in USB 1.1 mode		All non-isochronous devices operate in their native mode (USB 1.1 or USB 2.0). Isochronous video devices are not supported (a warning overlay will not appear).

Tera 1 with EHCI Disable (Devices operate in USB 1.1 mode only)
	Root Port		Behind USB 1.1 and 2.0 Hub
View Desktop	All devices operate in USB 1.1 mode		All devices operate in USB 1.1 mode
PCoIP Remote Workstation Card	All devices operate in USB 1.1 mode		All devices operate in USB 1.1 mode
Tera 1 with EHCI Enabled (Devices operate in USB 1.1 mode only)
	Root Port	Behind USB 1.1 Hub		Behind USB 2.0 Hub
View Desktop	All devices operate in their native mode USB 1.1 or USB 2.0) except USB 2.0 isochronous video devices, web, cams). USB 2.0 isochronous video devices* operate in USB 1.1 mode.	All devices operate in USB 1.1 mode		All non-isochronous devices operate in their native mode (USB 1.1 or USB 2.0). Isochronous video devices are not supported (a warning overlay may appear).
PCoIP Remote Workstation Card	All devices operate in USB 1.1 mode	All devices operate in USB 1.1 mode		All devices operate in USB 1.1 mode