Acer ALH-608ds User`s manual

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8-Port AcerHub
Dual-Speed Ethernet Hub
User's Manual
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Copyright©1998-1999 Acer Netxus Inc. All rights reserved. No part of this
publication may be reproduced, transmitted, transcribed, stored in a
retrieval system, or translated into any language or computer language, in
any form or by any means, electronic, mechanical, magnetic, optical,
chemical, manual or otherwise, without the prior written permission of Acer
Netxus Inc.
Acer Netxus Inc. makes no representations or warranties, either expressed
or implied, with respect to the contents hereof and specifically disclaims
any warranties, merchantability or fitness for any particular purpose. Any
software described in this manual is sold or licensed “as is”. Should the
programs prove defective following their purchase, the buyer (and not this
c o m p a n y, its distributor, or its dealer) assumes the entire cost of all
necessary servicing, repair, and any incidental or consequential damages
resulting from any defect in the software. Furthermore, Acer Netxus Inc.
reserves the right to revise this publication and to make changes from time
to time in the contents hereof without obligation to notify any person of
such revision or changes.
Other brand and product names are trademarks and/or registered trademarks of
their respective holders.
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1. Read these instructions carefully. Save these instructions for future
2. Follow all warnings and instructions marked on the product.
3. Unplug this product from the wall outlet before cleaning. Do not use
liquid cleaners or aerosol cleaners. Use a damp cloth for cleaning.
4. Do not use this product near water.
5. Do not place this product on an unstable cart, stand, or table. The
product may fall, causing serious damage to the product.
6. The openings should never be blocked by placing the product on a
bed, sofa, rug, or other similar surface. This product should never be
placed near or over a radiator or heat register, or in a built-in
installation unless proper ventilation is provided.
7. This product should be operated from the type of power indicated on
the marking label. If you are not sure of the type of power available,
consult your dealer or local power company.
8. Do not allow anything to rest on the power cord. Do not locate this
product where persons will walk on the cord.
9. If an extension cord is used with this product, make sure that the total
ampere rating of the equipment plugged into the extension cord does
not exceed the extension cord ampere rating. Also, make sure that
the total rating of all products plugged into the wall outlet does not
exceed 15 amperes.
10.Do not attempt to service this product yourself, as opening or
removing covers may expose you to dangerous voltage points or other
risks. Refer all servicing to qualified service personnel.
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About this Manual
This user manual gives you all the information you need to operate the
AcerHub ALH-608ds dual-speed Ethernet hubs properly.
Note: ALH-608ds is the model number of AcerHub 608ds.This model number
"ALH-608ds" will be used through this manual.
Manual Structure
This user manual consists of Quick Installation Guide, four chapters and one
appendix as follows:
Quick Installation Guide
Chapter 1
This chapter describes the features and functions of the AcerHub ALH-608ds
hub, and the items in the package.
Chapter 2
Make Your Hub Ready
This chapter describes the installation procedures to quickly make your hub
ready for networking and the easiest way to find out if the hub is working well.
Chapter 3
Building Feasible Networks
This chapter describes the network topology for hybrid 10Mbps and 100Mbps
networks, cabling requirements for connections, and the interoperability
between other hubs and switches. A detailed introduction of the bridged uplink
port will also be given.
Chapter 4
This chapter provides a simple troubleshooting guideline that you can follow to
eliminate errors for quick network recovery.
Appendix A
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Table of Contents
Chapter 1 Overview
Product goal
Product features
Product configuration
Chapter 2 Make Your Hub Ready
Connecting to the external power supply
Installing the hub on your working surface
Connecting to computers
Does the hub work well?
2.4.1 LED overview
2.4.2 System status indicators
2.4.3 Network status indicators
2.4.4 Network utilization indicators
Chapter 3 Building Feasible Networks
Network topology for AcerHub ALH-608ds
Interconnection to hubs and switches
Chapter 4 Troubleshooting
Appendix A Specifications
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Quick Installation Guide
1. Unpack the AcerHub ALH-608ds dual-speed Hub and it's
accessories (refer section 1.3).
2. Connect the Hub to the external Power supply (refer to section 2.4.1)
3. Use the normal ports to connect to PCs and computers.
4. Use the uplink port to connect to another hub or LAN switch.
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1. Overview
Congratulations on your purchase of the AcerHub 608ds. The AcerHub ALH608ds is a 8-port dual-speed fast Ethernet repeater hub for connection with
multiple PCs to a workgroup LAN (Local Area Network) environment to share
network resources.
1.1 Product goal
AcerHub ALH-608ds provides high-speed and easy access to the LAN and
Intranet both for SOHO (Small Office/ Home Office) and corporations. It
allows data transmission at speeds of 10 Mbps or 100Mbps, depending if the
connected device is running at 10Mbps or 100Mbps. Besides the high-speed
data access, the AcerHub ALH-608ds also supports one uplink port for ClassII cascading connection between hub stacks. The uplink port will support the
bridge function that permits a distance of 100 meters for data transmission in
Class-II cascading and eliminates the repeater count limitation in IEEE 802.3u
specifications. It will be easy to construct your own LAN with ALH-608ds by
this explicit expanding capability of data transmitting distances and user
Installation of AcerHub ALH-608ds is relatively simple and all you have to do
is plug the cables from the adapter cards to the ports, check the LEDs and
you can start networking.
1.2 Product Features
AcerHub ALH-608ds provides the following features:
• 8-port dual-speed hub, each port is a 10/100 Mbps dual-speed connection
with network speed auto-detection
• Fully complies with IEEE 802.3 and 802.3u specifications
• Built-in switching function to connect 10 and 100Mbps network
• Stackable function to provide maximum stacking of 5 sets as a single hub
count by SCSI-II cables
• In slave hub mode, an uplink port with bridge function which provides
scalable network expansion.(This function is very useful in constructing a
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large network,refer section 3.1 for details.)
• Built-in switch auto-disable function to avoid data looping when
• External switching power supply for lower power consumption and
heat emission
• Compact design for SOHO desktop environment for easy
1.3 Product configuration
The product configuration inside the package is shown in the figure 1-1.
Please check the contents of the package if there is any missing part before
using the hub. The accessories of this product include:
ALH-608ds dual-speed hub
External switching power adapter
Power cord
Stacking cable (SCSI-II)
Stacking kit
User's manual
1 piece
1 piece
1 piece
1 piece
1 pair
1 piece
Figure 1-1 Product configuration of AcerHub ALH-608ds
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2. Make Your Hub Ready
This chapter will guide you through how to install the AcerHub ALH-608ds. It
includes procedures for connecting to the external power supply, installing the
hub on your working surface, connecting the Hub to your computer, and
guidelines to see if it works well. Before setting up your hub, please take note
of the front and rear panel of this hub, as shown in Figure 2-A and 2-B.
Figure 2-A Front Panel
Note: The ports marked "II"", "2", "3", "4", "5", "6", "7","8" are
normal ports.
Figure 2-B Rear Panel
Please follow the installing procedures to make your network ready:
2.1 Connecting to the external power supply
Carefully unpack the AcerHub ALH-608ds and it's accessories. For the first
time that you use this hub, please make sure there is nothing missing in the
package. The procedures for connecting to the power outlet are:
2.1.1 Take out the hub and the power adapter from the packing box, as shown
in Figure 2-1.
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Figure 2-1 Get the hub and power adapter
2.1.2 Place the hub on the desktop and remove the packing box of the power
adapter, as shown in Figure 2-2.
Figure 2-2 Put the hub on desktop and find the proper power adapter
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2.1.3 Verify it's a 5V,3A power adapter by looking at the indicating label. If the
adapter is correct, please stretch the cable and plug the cord into the power
jack of the hub, as shown in Figure 2-3.
Figure 2-3 Connect to the power adapter
2.1.4 Once the hub is connected to the power adapter, please connect the
power adapter to a power cord, as shown in Figure 2-4.
Figure 2-4 Connect to the power cord to wall outlet
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2.1.5 Plug the power cord into the outlet on the wall and check if the power
LED lights up. If it lights up, then the hub is ready to be connected to the
network, as shown in Figure 2-5.
Figure 2-5 Power on the hub and make it ready
2.2 Installing the hub on your working surface
You have to find a solid working surface to place the hub and make sure the
equipment is not close to any high voltage power source or over-heated
sources. Also keep away from electronic equipment sensitive to electronic
interference. The brief procedures of installing your hub should be:
2.2.1 Put the hub on a stable working surface, as shown in Figure 2-6.
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Figure 2-6 Lay hub on stable desktop
2.2.2 If you are installing more than one hub, please turn off the power of all
hubs first. Then you can get another hub and place it above the previous one
on the working surface, as shown in Figure 2-7. Finally, put the stacking kit in
the middle of two sides and click into the stacking hole in the plastic housing.
Check if all hubs are tightly fastened by the stacking kits and proceed to next
Figure 2-7 Unplug the power,and stack two hubs together
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2.2.3 Get the stackable cable and connect the cable to the stacking connector
on the hub, as shown in Figure 2-8. Connect "Down" SCSI port of the upper
hub to "Up" SCSI port of the lower hub. Any loose connection of the stackable
cable will cause problems with network performance and quality.
Figure 2-8 Connect hubs by stacking cable
2.2.4 If you are trying to add more hubs in your office, you can follow the
procedures from 2.2.2 to 2.2.3 repeatedly. Be sure not to stack hubs more
than 5 (include 5) sets in one stack.
2.2.5 Plug the power cord into the outlet on wall and check if the power LED
lights up. The hub is ready for network connection if the power LED lights up,
as shown in Figure 2-9.
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Figure 2-9 Stack multiple hubs together
2.3 Connecting to computers
2.3.1 Make sure the hub is ready for networking by checking if the PWR
indicator displays.
2.3.2 See if the computer is working and find the RJ-45 connector of the adapter
card in computers. You can connect UTP (Unshielded Twistered Pair) cables
from normal ports of the hub to computers directly, as shown in Figure 2-10.
Figure 2-10 Connect to computers
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2.3.3 Arrange the route for cabling if no fixed cabling box is provided.
Otherwise, It's right way to connect from your computer to the fixed cabling
box on your working surface and plug the other end of the cable to the RJ-45
connector on the hub, as shown in Figure 2-11.
Figure 2-11 Connect UTP cable from hub to computers
2.3.4 After connecting to the hub, please check if the Link LEDs on the
adapter card and the hub(named as LNK/Rx) are lit up, as shown in
Figure 2-12. If the LED is not lit up, there must be something wrong and
please reference to chapter 4 for quick trouble shooting.
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Figure 2-12 Check the Link LEDs both on hub and adapter card
2.3.5 If you are trying to connect more cables to the hub, please follow
procedures from section 2.3.2 to 2.3.4.
2.4 Does the hub work well?
You can observe the LED status to see if the hub works fine. The meanings of
LEDs are defined in section 2.4.1.
2.4.1 LED overview
The locations of LED indicators are shown in Figure 2-13.
Figure 2-13 LED overview
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There are three groups of LED indicators in the front panel:
• System status indicators: Indicate the overall system status of the hub. It
includes system PWR, Fan Err., Master, Slave indicators, Collision of 10 and
100M, and Bridge function
• Network status indicators: Indicate working status of each connection port, It
includes port 100/10M, LNK/Rx and Partition
• Network utilization indicators: Indicate the bandwidth utilization of 10 and
100Mbps. It includes 5, 15, 25, 35, 55+ scales indicators
2.4.2 System status indicators
Figure 2-14 System Status Indicators
PWR: Indicates if the system is provided with power.
FAN Err.: Indicates if the cooling FAN is dead.
Master/Slave: Indicates if the system is stacked to be the Master or Slave
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Note: It's normal either Master or Slave LED will display when hubs
are stacking.
Note:The difference between Master hub and Slave hub will be
explained in chapter 3.
Collision: Indicate if a collision occurs in 10Mbps or 100Mbps domain.
Bridge: Indicates if the bridging function is enabled.
Note: The slave hub will provide a Bridge Uplink Port, see chapter 3 for
2.4.3 Network Status Indicators
There are 3 LED indicators to indicate the network status of each connection
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Figure 2-15 Network Status Indicators
100/10: Indicates if the port is working at 100Mbps or 10Mbps.
LNK/Rx: Indicates if the port is linked to another port or receiving data.
Partition: Indicates if the port is partitioned or not. A port is partitioned if it
experiences consecutive collisions.
2.4.4 Network utilization indicators
There are 2 sets of LED indicators to indicate the real-time network utilization
of 10Mbps and 100Mbps domain.
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Figure 2-16 Network utilization indicators
The number of utilization is in percentage. For example, "15" of "100M" means
15% of 100Mbps, "55+" of "10M" means the utilization is more than 55% of
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3. Building Feasible Networks
This chapter describes the network topology for hybrid 10Mbps and 100Mbps
networks, cabling requirement for connections, the interoperability between
hubs and switches and the function of bridge Up-Link port. Please turn over
the page to see the different Topologies.
3.1 Network topology for AcerHub ALH-608ds : The factors for ALH-608ds
dual-speed network implementation are:
• For stand-alone one, the ALH-608ds consists of separate 10Mbps and
100Mbps network domains with one built-in switch to inter-connect the data
in domains, as shown in Figure 3-1.
Figure 3-1 Separate domains in ALH-608ds.
• The hub will be divided into Master and Slave hubs when they are stacked
together. The upper most hub is the Master hub, and other hubs are Slave
hubs. The Master hub continues to use the built-in switch but the switch
in the Slave hubs will be disabled. The Slave hubs will provide a uplink port
with bridge functional(so called Bridge Uplink Port) that utilizes the first
connection port as well, as in Figure 3-2.
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Figure 3-2 Master and Slave hubs in stacking ALH-608ds.
1. To concern the convenience of the cross-wiring connection
between hubs, ALH-608ds provide 1 normal port (marked as "II)
and 1 cross-over port (marked as "X"). These 2 ports are wired to
each other by different wiring assignments.
2. The up-link port utilizes the first connection port with "X"
sign.When you connect to another hub by this uplink port, you
cannot simultaneously connect a PC to this port in which "II" sign is
marked . The reason being that if a PC is connected to it, the
physical signal in the cable will be corrupted.
• The built-in switches in slave hubs will be disabled automatically to avoid
data looping from multiple inter-connections of hubs, as shown in Figure 3-3.
Figure 3-3 Auto Data looping prevention in ALH-608ds.
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• By way of an uplink port with a Bridge function, the limitations on 100Mbps
hub count(maximum 2) can be eliminated. The hub count is unlimited and
cable length between hubs can reach 100meters, as shown in Figure 3-4.
Figure 3-4 Unlimited cascading of ALH-608ds.
• All PCs with 10Mbps network adapter cards transmit data at 10Mbps and
form the 10Mbps network domain, as shown in Figure 3-5.
• PCs with 10/100Mbps network adapter cards will auto-negotiate and switch
the network speed to 100Mbps. They transmit data at 100Mbps and form the
100Mbps network domain, as shown in Figure 3-5.
Figure 3-5 Network domains and bridged uplink.
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• The data in 10Mbps or 100Mbps domain will be inter-connected by internal
built-in switch in the Master hub consequently.
• All hubs delivering data by the shared-bus always work on half-duplex mode;
that is, data can be sent or received at one time in one direction.
3.2 Interconnection to Hubs and Switches
3.2.1 Connecting to Ethernet Hubs : The factors governing hub
interconnection are:
• The hubs are only connected by uplink port. ALH-608ds will automatically
transmit at 10Mbps network speed when connecting to 10Mbps Ethernet
hubs and 100Mbps network speed if connected to 100Mbps hubs.
• If multiple ALH-608ds are stacked together, users can connect to hubs by
the uplink port in slave hubs. Therefore other hubs can perform another
class-II cascading, as shown in Figure 3-6.
Figure 3-6 Connect to Ethernet Hubs.
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3.2.2 Connecting to Ethernet Switches : The factors governing hub and
switch interconnection are:
• The hubs are only connected to Ethernet switches by an uplink port. ALH608ds will automatically work at 100Mbps network speed when connected to
10/100Mbps Ethernet switching ports and it will work at 10Mbps network
speed if connected to 10Mbps switching ports.
Figure 3-7 Connect to Ethernet Switches.
No matter if the ALH-608ds hubs are stacked together or not, the user always
can connect to Ethernet switches by the uplink port.
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4. Troubleshooting
4.1 Symptoms and Suggestions
All LEDs are
Possible Reason
The hub is not receiving
DC power
Link LED of a 1.The UTP cable is not
securely connected
port is off
2.The port is bad
3. If the other party is a
PC, the Network
interface card(NIC)
could be not working
4. If the other party is a
hub or LAN switch, the
connected ports signal
could be cross-over
100 LED is
not lit when
connected to
a 100 NIC or
100 Hub(but
Link LED is
User's Manual
1. Check if the AC power cord
is securely fastened at both
ends ands that power is
available at the AC outlet.
2. Check if the power adapter
DC 5V cord is connected to
Hub's DC jack
1. Check the cable connection
2.Try to connect another port
3. Check if the network
interface card(NIC)is
installed properly
4. Make sure ALH-608ds
normal port is connected to
the other hub's(or
switch's)uplink port(or called
cross-over port); and ALH608ds uplink port is
connected the other's
normal port
5. Try another normal cable
5. The UTP cable is
broken, or it is a crossover cable
1. Un-plug the UTP cable from
The auto-negotiation
ALH-608ds, and plug-in
function is failed between
ALH-608ds and the other
2. Check if the NIC is set to
anto-negotiation mode
3. Check if the other hub is set
to auto-negotiation mode
4. if the above steps does not
work, it is an interoperability problem, contact
your vendor
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4.2 Master and Slave LEDs State and Result/Action
If you have any problem in building your network with AcerHub ALH-608ds,
please contact your Vendor or visit our website:
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Appendix A.Specifications
Network Interface
8-port 10/100 dual-speed auto-detection function
• 10Mbps Ethernet
IEEE 802.3 10Base-T
• 100Mbps Ethernet
IEEE 802.3u 100Base-TX
One of the ports(Port NO.1)has two RJ-45 connector to provide either
normal or uplink connection.
Physical Dimension (From front View)
230 mm
170 mm
45 mm
1.5 Kg
Environmental Operating Range
Operating Environment
0° to 55° C (32° to 131° F)
Operating Humidity
20% to 80% non-condensing
Network Cable Specification
UTP Category 5 LAN cable of EIA/TIA-568 and EIA/TIA TSB-36
specifications for 100Mbps
Stacking Specification
Maximum stacking of 5 sets as a single hub count by SCSI Cables
SCSI-II 25-pin connection cable of 100 mm long
External Switching Power Adapter
Operating AC power voltage 100~240V AC Auto-switching
Output DC power voltage 5V, 3A maximum
EMI Certifications
Part 15, Class A
EN-55022, Class-A
VCCI-V3, Class A
AS/NZS 3548/CISPR 22, Class A
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Product Limited Warranty
Acer Netxus Incorporated (ANI) warrants its product to be free from defects in
materials and workmanship, under normal use and service, for the following lengths of
time from the date of purchase from ANI or its Authorized Resellers.
Network adapter card
Unmanaged hub
Dual-speed hub
Switch and managed hub
Limited Lifetime
*Limited Lifetime
*3 year
*3 year
* Power supply/adapter and fans in these devices provide ONE YEAR warranty
All products with limited lifetime warranty have a standard five-year warranty. This
warranty does not cover the product if it is damaged by abuse, accident, misuse,
improper installation, or improper testing. If a product does not operate as warranted
during the applicable warranty period, ANI shall, at its option and expense, either repair
the defective product or part returned to ANI, or deliver to customer an equivalent
product or part to replace the defective item. Definitely, all products that are replaced
will become the property of ANI. Replacement products may be new or reconditioned.
Any replacement or repaired product or part has a ninety days warranty or the
remainder of the initial warranty period, whichever is longer. ANI shall not be
responsible for any software, firmware, information, or memory data of customer
contained in, stored on, or integrated with any products returned to ANI pursuant to any
warranty. Before you obtain warranty service, you must request an RMA (Return
Materials Authorization) number by calling, faxing or writing ANI’s Customer Service
Department at the numbers listed below. You must use the original container (or the
equivalent) and pay the shipping charge.
If you purchased this product in the UNITEDSTATES, some states do not allow the
limitation or exclusion of liability for incidental consequential damages, so the above
limitation may not apply to you.
Model Name
Series No. (S/N)
Purchase Date
( Authorized distributors' or Resellers' Stamp )
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Contact us:
Acer Computer International Ltd.
Acer UK Limited
Taiwan Branch
Tel: 886-2-2713 9099 ext.7293
Tel: 44-1628-533422
Fax: 44-1628-524071
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Tel: 1-408-432 6200
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Tel: 33-1-4817 4040
Fax: 33-1-4817 4089
Hotline: 1-800-369 6736
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Dealers' Information
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Tel: 1-305-392 7200
Fax:1-305-392 7216
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Tel: 81-4-8290 1819
Tel: 49-4102-488-0
Fax: 49-4102-488-101
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Tel: 34-3-499-0303
Fax: 34-3-499-0483
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Acer Computer B.V.
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Tel: 31-73-645 9645
Fax: 31-73-645 9599
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