Accton Technology USB204B Manuale utente

Cheetah USB Hub

Quick Installation Guide

Cheetah USB Hub

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:

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

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.

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

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

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

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.

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: 886-3-5770-270

FAX: 886-3-5770-267

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: 949-707-2460

USB204B

E052000-R01

150453-102

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