Accton Technology USB204B User manual

Cheetah USB Hub
Quick Installation Guide

Cheetah USB Hub
2
Introduction
Accton’s USB204B offers a convenient and cost-effective
means of bringing Universal Serial Bus (USB) connectivity to
the desktop. Accton’s Universal Serial Bus products feature
true plug-and-play connection of PC peripherals "outside the
box" and mark a significant advance in desktop cable
management. These state-of-the-art, practical products
provide ease-of-use benefits to PC users in the home, office,
or on the road.
The USB204B provides 4 downstream ports, for connection to
USB-equipped peripherals (including other hubs), and 1
upstream port for connection to your PC's USB port, or to
another USB204B. It supports both full speed (12 Mbps) and
low speed (1.5 Mbps) devices such as a mouse, keyboard or
joystick. The USB204B can be either self-powerd or bus-
powered. In bus-powered mode, this hub derives its operating
power from the USB connection directly. The Cheetah USB
Hub also provides overcurrent detection and protection for
each port. Five USB hubs can be daisy-chained together in
series, supporting any combination of derives up to a
maximum of 127 (including the hubs).
The components of the USB204B are shown in the figure
below:

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Quick Installation Guide
Check the Package
The USB204B includes:
•1 USB204B •2-meter shielded USB cable
•1 power adapter • 1 user guide
•1 registration card (please return)
System Requirements
The USB204B requires the following basic host PC features to
operate:
•A host PC that supports the Universal Serial Bus (USB)
•A PC operating system with a generic USB hub driver,
including Microsoft Windows 95 (OSR2.1 or later), 98, 2000
Hub Operation
The USB204B is a device used to extend the host PC USB
interface. The hub supplies 4 additional USB ports to attach to
devices or other hubs.
Accton’s USB204B can be bus-powered, conveniently
drawing power from the Universal Serial Bus. Therefore, the
host PC has the ability turn on or off any hub, individual port,
or a device attached to a port. The USB204B also supports the
energy-saving suspend, resume and remote wake-on-ring
functions. What’s more, the hub and each downstream port
are overcurrent and short-circuit protected.
Please note the following general points about USB hub
operation:
•Hubs and devices are hot pluggable and can be connected/
disconnected at any time, even while the host PC is
powered on.
•Hubs can be daisy-chained up to 5 deep in series, or in any
combination that does not exceed 127 devices.
•Hubs are dual-powered devices. They can be powered via
the upstream connection (bus powered), or by an optional
power supply (self powered).
•When bus-powered, downstream ports support only “low-
power” devices, such as a mouse, keyboard or a self-
powered hub.
•When self-powered, downstream ports can support “high-
power” devices, such as a printer or a bus-powered hub.
Note: A USB204B must be self-powered by an optional power adapter
to daisy-chain to another hub that is only bus-powered.

Cheetah USB Hub
4
Connect the Hub to the Host PC
The USB204B should be
connected directly a host PC’s
USB port. The hub only has to be
plugged into the host USB
connector to operate. Up to 4
other hubs can then be daisy-
chained in series from the first
hub.
1. Prepare standard shielded 90Ω
USB cable with Type-A
(upstream) and Type-B
(downstream) plugs on each
end. The maximum cable
length is 5 meters (16.4 feet).
2. Connect the Type-A end of the cable to the host PC’s USB
port and the Type-B end to the hub.
3. Check that the hub’s downstream port power LED is green.
If this LED is off, then follow the advice in the
“Troubleshooting” section to diagnose the problem.
Connect Devices to the Hub
Before connecting devices to
the hub, check the
USB interface
requirements.
Devices can be
“low-power” or
“high-power,”
with “low-speed” or “full-speed” signaling. The USB204B is a
high-power, full-speed device. Refer to instructions supplied
with each USB device for their individual operation.
1. Prepare standard 90ΩUSB cable with Type-A (upstream)
and Type-B (downstream) plugs on each end.
Low-Speed Devices: Shielded or unshielded 90ΩUSB cable
Full-Speed Devices: Shielded 90ΩUSB cable
Cable Length: Maximum 3 m (9.8 ft) for unshielded cable
Maximum 5 m (16.4 ft) for shielded cable
2. Connect the Type-A end of the cable to one of the hub’s
downstream ports and the Type-B end to the USB device.
3. Check that the hub’s downstream port power (green) LED
is on. If this LED is off, then follow the advice in the
“Troubleshooting” section to diagnose the problem.

5
Quick Installation Guide
Troubleshooting
The USB204B can be easily monitored through its indicators.
You should be able to quickly resolve any problem by following
the troubleshooting steps listed below. If you cannot solve the
problem, contact your Accton distributor for further assistance.
General Problems
Many problems and error conditions can be cleared by first
following these steps:
1. Ensure all upstream cables are properly connected and that
all upstream hubs and the host PC are powered on.
2. Be sure the host PC and hub are not in suspend mode by
pressing any key on the keyboard or moving the mouse.
3. Disconnect devices from the hub and reset the hub. To
reset the hub, simply unplug the upstream connection and
then plug it back in.
Overcurrent LED is Red
This indicates an overcurrent condition exists.
1. Disconnect devices on downstream ports 1 through 4 one
at a time until the LED turns off. The last device
disconnected is causing the overcurrent condition.
2. If the LED is still red with all devices removed, reset the hub
by unplugging the upstream connection and plugging it back
in. If the LED remains red, the unit is defective and should
be replaced.
A Single Downstream Port Power LED is Off
The port has been disabled by the host PC. An overcurrent
condition may exist on the port, or the device driver identified a
problem with the device and turned the port off.
1. Disconnect the device. If the port LED does not turn on,
reset the hub. If the LED then turns on, you can reattach
the device.
2. If the LED does not turn on after the hub reset, you may
have to reboot the host PC.

Cheetah USB Hub
6
USB Application Diagram
EMIWarning
FCC Class B Certification
Accton Technology Corporation
Model Numbers: USB204B
FCC ID: HED4000USB
Warning: This equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to Part 15 of
the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate
radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by
one or more of the following measures:
•Reorient or relocate the receiving antenna
•Increase the separation between the equipment and receiver
•Connect the equipment into an outlet on a circuit different
from the one which the receiver is connected to
•Consult the dealer or an experienced radio/TV technician for help
You are cautioned that changes or modifications not expressly
approved by the party responsible for compliance could void
your authority to operate the equipment.
You may use shielded USB cable.
Note: In order to maintain compliance with the limits of a Class
B digital device, Accton requires that you use a quality

7
Quick Installation Guide
interface cable when connecting to this device. Changes or
modifications not expressly approved by Accton could void the
user's authority to operate this equipment. Suggested cable
type is 90ΩUSB cable.
CE Mark Declaration of Conformance
This is to certify that this product complies with ISO/IEC Guide
22 and EN45014. It conforms to the following specifications:
EMC: EN55022(1988)/CISPR-22(1985) class B
IEC 1000-4-2(1995) 4kV CD, 8kV AD
IEC 1000-4-3(1995) 3V/m
IEC 1000-4-4(1995) 1kV - (power line)
0.5kV - (signal line)
IEC 1000-4-6(1995) 3Vrms
This product complies with the requirements of the Low Voltage
Directive 73/23/EEC and the EMC Directive 89/336/EEC.
Product Specifications
Standards Conformance Universal Serial Bus Specification 1.1
Number of Ports 4 USB Type-A (downstream) ports
1 USB Type-B (upstream) port
Dimensions 119 x 66 x 32 mm (4.68 x 2.59 x 1.26 in)
Weight 100 g ( 3.5 oz)
System Requirements A PC that supports the Universal Serial Bus
An operating system with a generic USB hub driver,
including Windows 95 (OSR2.1 or later), 98, 2000
Power Requirements
Bus-Powered Mode 2.5W, 5 VDC at 0.5A max. (from USB host controller)
Self-Powered Mode 12.6W, 6 VDC at 2.1A max. (100-240 VAC, 50/60 Hz from
optional adapter)
Maximum Current 2.1A @ 6 VDC (from adapter)
Cable Wiring
Full-Speed Devices 90Ωshielded USB cable
Low-Speed Devices 90Ωshielded or unshielded USB cable
Maximum Length 5 m (16.4 ft) for shielded cable, 3 m (9.8 ft) for unshielded
Maximum Devices 127 (5 hubs in daisy-chain, 6 cables end-to-end max.)
Access Method Differential and bi-directional per USB spec. 1.1
12 Mbps full speed, 1.5 Mbps low speed
Status LEDs Power for hub (red=self-powered, green=bus-powered)
Power for Downstream port , Overcurrent
Environmental
Temperature 0° - 40°C / 32° - 104°F (Standard Operating)
-20° - 70°C / -4° - 160°F (Storage)
Humidity 5 - 95% (Noncondensing)
Certification CE Mark
Emissions FCC Class B

Cheetah USB Hub
8
Warranty
Accton warrants to the original owner that the product delivered in this
package will be free from defects in material and workmanship for a
period of three (3) years from the date of purchase from Accton or its
authorized reseller. For the warranty to apply, you must register your
purchase by returning the registration card indicating the date of purchase
and including proof of purchase. There will be a minimal charge to
replace consumable components, such as fuses, power transformers,
and mechanical cooling devices. The warranty does not cover the
product if it is damaged in the process of being installed. Accton
recommends that you have the company from whom you purchased
this product install it.
THE ABOVE WARRANTY IS IN LIEU OF ANY OTHER WARRANTY, WHETHER
EXPRESS, IMPLIED OR STATUTORY, INCLUDING BUT NOT LIMITED TO ANY
WARRANTY OF MERCHANTABILITY, FITNESS FORA PARTICULAR PURPOSE, OR
ANY WARRANTY ARISING OUT OFANY PROPOSAL, SPECIFICATION OR SAMPLE.
ACCTON SHALLNOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES.
ACCTON NEITHER ASSUMES NOR AUTHORIZES ANY PERSON TO ASSUME FOR IT
ANY OTHER LIABILITY.
Copyright
Copyright © 2000 by Accton Technology Corporation. All rights reserved.
No part of this document may be copied or reproduced in any form or
by any means without the prior written consent of Accton Technology
Corporation.
Accton makes no warranties with respect to this documentation and
disclaims any implied warranties of merchantability, quality, or fitness
for any particular purpose. The information in this document is subject
to change without notice. Accton reserves the right to make revisions
International Headquarters
No. 1 Creation Road III,
Science-based Industrial Park
Hsinchu 300, Taiwan, R.O.C.
Phone: [phone]
FAX: [phone]
Internet: [email protected]
USA Headquarters
P.O. Box 51420
Irvine, CA 92619-1420
Phone Numbers -
Sales: 888-398-2101 or 949-707-4800
Support: 888-398-4101 or 949-707-4847
RMA: 888-398-3101 or 949-707-4828
FAX: [phone]
USB204B
E052000-R01
150453-102