Download Print this page

NComputing U170 Configuring page 2

Hide thumbs Also See for U170:

Determining Your 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.