Amulet Hotkey DXZ4-A, Руководство пользователя

Страница: 42 / 44

DXZ4 security edition zero client
Page 42
There are several Knowledge Base Articles available for fitting
different RPCs.
For power-cycling the remote PC, it is advisable to contact
Amulet Hotkey Technical Support to discuss your individual set
up.
• If possible, remove USB hubs from the DXZ4 security edition
zero client’s black list of unauthorized devices. (To
compensate for this easing of restrictions, you may need
to specify a corresponding white list of devices that are
authorized for use in your organization. If so, users will need
to connect these devices to the other USB ports.
8.2.3 Why is an integral hub included?
The hub was included behind the rear ports to allow the DXZ4-A
and DXZ4-AM to support additional functionality in the future.
It also ensures that high-speed USB devices connected to other
DXZ4-A or DXZ4-AM ports, such as a flash drive, do not suffer
from compromised performance. Finally, it enables administra -
tors to use a keyboard (plugged into the rear ports) in a PCoIP
session to enter the BIOS setup on a remote computer. See 8.3 .
The hub can provide these advantages because it converts low
speed USB transactions to high speed USB transactions. This
allows the remote BIOS (or UEFI) to service devices attached to
the DXZ4 security edition zero client’s rear ports using the EHCI
implementation of USB (see the note below). If the hub were
not present, the remote BIOS or UEFI would need to use OHCI to
service these devices, which could cause problems. For example,
many BIOS and UEFI interfaces do not support OHCI so an
administrator might be unable to press F12 (or equivalent keys)
to enter BIOS Setup during a PCoIP session.
Note: EHCI (Enhanced Host Controller Interface) was created
to support only high speed data rates for USB 2.0. OHCI (Open
Host Controller Interface) is a non-proprietary USB implemen -
tation that supports low and full speed data rates for USB 1.1.
EHCI and OHCI are both integrated into PCoIP processors.
8.3 Access the BIOS of the remote PC/Workstation
from the zero client
In some cases it can be possible and useful to be able to
power-cycle or reboot the host PC (or workstation) from the
zero client. In addition, during the power-cycle, it may then be
possible to access the BIOS from the zero client.
8.3.1 Power-cycle the Dell PowerEdge Blade Workstation
As Dell Blade PowerEdge Workstations contain an Amulet
Hotkey BIOS, it is possible to power-cycle the host from the zero
client. This can be done from the OSD screen when the keyboard
is plugged into a USB port connected to the internal hub (any
of the rear USB ports). Follow the on-screen instructions for
accessing the BIOS on reboot of the host.
8.3.2 Power-cycle a remote PC
For remote host PCs that contain either a DXH4 or DXP4 card it
may also be possible to reboot the PC remotely and access the
BIOS. However this will depend on two factors:
• if the individual BIOS (such as Dell, HP, Lenovo) is supported
for this;
• if a Remote Power Cable (RPC) is fitted to
facilitate power-cycling.