Determining U170 Environment

[NComputing India]

Determining U170 Environment

There are a number of attributes in choosing the right configuration
and topology for a U170
deployment; we will cover each of the following:
- Topology
- Host PC
- Power: Powered hubs and cables
- Host or system performance
o CPU
o Memory
o USB bus
- Application performance
- Internet performance
It is important to note that all of these attributes are interrelated
and what is implemented on one
attribute may affect performance on another, so understanding these
computing fundamentals is
important.
It is important to read the Users Guide first; this document will not
address install processes or
procedures.
The topology or layout of a U170 environment is very important as USB
compliance, power and
cabling/hub needs must be met. Please map out your topology in advance
to make sure you
understand what it will look like in advance, performance and power
considerations (noted
below) and what cables and hubs will be needed. We will provide a
topology check list after we
discuss the factors that can impact the topology and performance.

Host PC

The recommended host configuration is defined in the User Guide;
please make sure to choose a
host with enough CPU power (for video), memory for the number of users
and multiple USB 2.0
buses (if needed). Remember to configure the host so that USB ports
are not shut down as this
will terminate any U170 active session.

Power: Powered Hubs and Cables

The USB 2.0 specification calls for 500 mA per port. Each USB device
with a standard mouse
and keyboard attached is expected to use about 400 mA of power (this
includes a power
allowance for the mouse and keyboard is up to 150 mA). Therefore there
can be only one U170
per USB port.
Use POWERED hubs when daisy chaining U170’s or when adding any
additional USB devices
downstream to a U170. The USB specification and all OS’s allow only 5
hops on a port, so
don’t exceed this number.