HP t505 Administrator Guide 7 - Page 55

Using printer redirection with RDP, USB redirection, High-level redirection, Model

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Table 7-9 Disabling USB redirection Registry entry root/USB/root/holdProtocolStatic Value to set 1 root/USB/root/protocol local Description Makes sure that the USBR type will not be automatically changed when a connection is set or unset Makes sure that the RDP connection does not attempt to redirect any devices to the remote session To completely disable local mounting of USB mass storage devices or to disable the redirection of USB mass storage devices but still allow other devices to redirect, in the thin client file system, delete the udev rule /etc/udev/rules.d/010_usbdrive.rules. Using printer redirection with RDP By default, RDP has two methods of printer redirection enabled: ● USB redirection-Any USB printer plugged into the device will show up as a local printer in the remote session. The standard printer installation process must happen in the remote session if the printer is not already installed on that remote host. There are no settings to manage locally. ● High-level redirection-If either USB redirection is unavailable on the remote host or the printer is a parallel or serial printer, use high-level redirection. Configure the printer to use a local printer spooler, and the RDP client automatically sets up a remote printer that sends print spooling commands through a virtual channel from the remote host to the thin client. This method requires both that the printer be configured on the thin client and a Windows driver be specified on the thin client because the RDP client needs to specify to the remote host which driver to use for the remote printer. This Windows driver must match the driver that the printer would use when locally attached to a Windows operating system. This information is usually found under the Model in the printer properties. NOTE: See Configuring a serial or parallel printer on page 65 for more information. Using audio redirection with RDP By default, high-level audio redirection will redirect audio from the remote host to the thin client. Basic voice control might need to be set up, and RDP 7.1 contains a number of advanced audio redirection features that might require additional configuration. See the following notes about using audio redirection with RDP: ● RDP delivers the highest quality audio as the network bandwidth allows. RDP reduces audio quality to play on low-bandwidth connections. ● No native audio or video syncing mechanisms are available in standard RDP. Longer videos might not sync with audio. MMR or RemoteFX can resolve this issue. ● HP recommends high-level audio redirection, but USB redirection of audio devices is possible if additional functionality is present, such as a digital volume control. Only high-level redirection is available for analog devices. ● Microphone redirection is enabled by default. The default microphone volume might need to be adjusted on the thin client. Older Windows RDP servers must have their settings modified to enable audio input. ● Both the local and remote volume settings will affect the final volume. HP recommends setting the local volume to a maximum and adjusting the volume within the remote host. Using device redirection with RDP 43

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Table 7-9
Disabling USB redirection
Registry entry
Value to set
Description
root/USB/root/holdProtocolStatic
1
Makes sure that the USBR type will not be automatically
changed when a connection is set or unset
root/USB/root/protocol
local
Makes sure that the RDP connection does not attempt to
redirect any devices to the remote session
To completely disable local mounting of USB mass storage devices or to disable the redirection of USB mass
storage devices but still allow other devices to redirect, in the thin client
file
system, delete the udev
rule
/etc/udev/rules.d/010_usbdrive.rules
.
Using printer redirection with RDP
By default, RDP has two methods of printer redirection enabled:
●
USB redirection
—Any USB printer plugged into the device will show up as a local printer in the remote
session. The standard printer installation process must happen in the remote session if the printer is not
already installed on that remote host. There are no settings to manage locally.
●
High-level redirection
—If either USB redirection is unavailable on the remote host or the printer is a
parallel or serial printer, use high-level redirection.
Configure
the printer to use a local printer spooler,
and the RDP client automatically sets up a remote printer that sends print spooling commands through
a virtual channel from the remote host to the thin client.
This method requires both that the printer be
configured
on the thin client and a Windows driver be
specified
on the thin client because the RDP client needs to specify to the remote host which driver to
use for the remote printer. This Windows driver must match the driver that the printer would use when
locally attached to a Windows operating system. This information is usually found under the
Model
in
the printer properties.
NOTE:
See
Configuring
a serial or parallel printer
on page
65
for more information.
Using audio redirection with RDP
By default, high-level audio redirection will redirect audio from the remote host to the thin client. Basic voice
control might need to be set up, and RDP 7.1 contains a number of advanced audio redirection features that
might require additional
configuration.
See the following notes about using audio redirection with RDP:
●
RDP delivers the highest quality audio as the network bandwidth allows. RDP reduces audio quality to
play on low-bandwidth connections.
●
No native audio or video syncing mechanisms are available in standard RDP. Longer videos might not
sync with audio. MMR or RemoteFX can resolve this issue.
●
HP recommends high-level audio redirection, but USB redirection of audio devices is possible if
additional functionality is present, such as a digital volume control. Only high-level redirection is
available for analog devices.
●
Microphone redirection is enabled by default. The default microphone volume might need to be adjusted
on the thin client. Older Windows RDP servers must have their settings
modified
to enable audio input.
●
Both the local and remote volume settings will
affect
the
final
volume. HP recommends setting the local
volume to a maximum and adjusting the volume within the remote host.
Using device redirection with RDP
43