D-Link DGS-108/B User Manual
D-Link™ DGS-108
8-Port 10/100/1000Mbps
Gigabit Ethernet Switch
Manual
First Edition
Building Networks for People
RECYCLABLE
D-Link DGS-108 Unmanaged Gigabit Ethernet Switch
____________________
Information in this document is subject to change without notice.
© 2005 D-Link Corporation. All rights reserved.
Reproduction in any manner whatsoever without the written permission of D-Link Corporation is strictly forbidden.
Trademarks used in this text: D-Link and the D-LINK logo are trademarks of D-Link Corporation; Microsoft and Windows are registered
trademarks of Microsoft Corporation.
Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products.
D-Link Corporation disclaims any proprietary interest in trademarks and trade names other than its own.
July 2005 P/N 6GS108.…01
FCC 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 when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with this
user’s guide, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause
harmful interference in which case the user will be required to correct the interference at his own expense.
CE Mark Warning
This is a Class B product. In a domestic environment, this product may cause radio interference in which case the user may be required to
take adequate measures.
Warnung!
Dies ist ein Produkt der Klasse B. Im Wohnbereich kann dieses Produkt Funkstoerungen verursachen. In diesem Fall
kann vom Benutzer verlangt werden, angemessene Massnahmen zu ergreifen.
Precaución!
Este es un producto de Clase B. En un entorno domé stico, puede causar interferenc ias de radio, en cuyo case, puede
requerirse al usuario para que adopte las medidas adecuadas.
Attention!
Ceci est un produit de classe B. Dans un environnement domestique, ce produit pourrait causer des interférences radio,
auquel cas l`utilisateur devrait prendre les mesures adéquates.
Attenzione!
Il presente prodotto appartiene alla classe B. Se utilizzato in ambiente domestico il prodotto può causare
interferenze radio, nel cui caso è possibile che l`utente debba assumere provvedimenti adeguati.
VCCI Warning
BSMI Warning
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D-Link DGS-108 Unmanaged Gigabit Ethernet Switch
CONTENTS
INTRODUCTION........................................................................................................................................... 1
ETHERNET TECHNOLOGY ............................................................................................................................... 1
Fast Ethernet Technology .......................................................................................................................... 1
Gigabit Ethernet Technology ..................................................................................................................... 1
SWITCHING TECHNOLOGY .............................................................................................................................. 1
SWITCH DESCRIPTION .................................................................................................................................... 2
Features .................................................................................................................................................... 2
FRONT-PANEL COMPONENTS ......................................................................................................................... 3
LED Indicators .......................................................................................................................................... 3
REAR PANEL DESCRIPTION ............................................................................................................................ 5
INSTALLATION ............................................................................................................................................ 6
Package Contents ...................................................................................................................................... 6
BEFORE YOU CONNECT TO THE NETWORK...................................................................................................... 6
MOUNTING THE SWITCH ON A WALL .............................................................................................................. 7
ATTACHING THE RUBBER FEET ...................................................................................................................... 8
PROVIDE FOR ADEQUATE VENTILATION ......................................................................................................... 8
POWER ON .................................................................................................................................................... 8
Power Failure ........................................................................................................................................... 8
CONNECTING THE SWITCH ................................ ..................................................................................... 9
SWITCH TO END NODE................................................................................................................................... 9
SWITCH TO HUB OR SWITCH ........................................................................................................................... 9
CONNECTING TO NETWORK BACKBONE OR SERVER ..................................................................................... 10
TECHNICAL SPECIFICATIONS ............................................................................................................... 11
GLOSSARY .................................................................................................................................................. 13
WARRANTY INFORMATION ....................................................... ERROR! BOOKMARK NOT DEFINED.
REGISTRATION INFORMATION ............................................................................................................ 18
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D-Link DGS-108 Unmanaged Gigabit Ethernet Switch
NOTE: A NOTE indicates important information that helps you make
better use of your device.
NOTICE: A NOTICE indicates either potential damage to hardware or loss
of data and tells you how to avoid the problem.
CAUTION: A CAUTION indicates the potential for property damage,
personal injury, or death.
Preface
The DGS-108 Manual is divided into sections that describe the system installation and operating instructions
with examples.
Section 1, Introduction - A description of the physical features of the Switch, including LED indicators,
ports and panel descriptions.
Section 2, Installation – A description of the physical installation of the Switch including connecting the
Switch to the network and connecting stacked switch groups.
Section 3, Connecting the Switch – A description of how to connect your Switch to an end node, hub,
switch, or backbone server.
Appendix A, Technical Specifications – The technical specifications of the DGS-108.
Glossary – Lists definitions for terms and acronyms used in this document.
Intended Readers
The DGS-108 Manual contains information for setup and management and of the DGS-108 Switch. This manual
is intended for network managers familiar with network management concepts and terminology.
Notes, Notices, and Cautions
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D-Link DGS-108 Unmanaged Gigabit Ethernet Switch
Safety Cautions
Safety Instructions
Use the following safety guidelines to ensure your own personal safety and to help protect your system from
potential damage. Throughout this safety section, the caution icon ( ) is used to indicate cautions and
precautions that you need to review and follow.
To reduce the risk of bodily injury, electrical shock, fire, and damage to the equipment, observe the following
precautions.
Observe and follow service markings. Do not service any product except as explained in your system
documentation. Opening or removing covers that are marked with the triangular symbol with a lightning bolt
may expose you to an electrical shock. Only a trained service technician should service components inside these
compartments.
If any of the following conditions occur, unplug the product from the electrical outlet and replace the part or
contact your trained service provider:
– The power cable, extension cable, or plug is damaged.
– An object has fallen into the product.
– The product has been exposed to water.
– The product has been dropped or damaged.
– The product does not operate correctly when you follow the operating instructions.
Keep your system away from radiators and heat sources. Also, do not block cooling vents.
Do not spill food or liquids on your system components, and never operate the product in a wet
environment. If the system gets wet, see the appropriate section in your troubleshooting guide or contact
your trained service provider.
Do not push any objects into the openings of your system. Doing so can cause a fire or an electric shock
by shorting out interior components.
Use the product only with approved equipment.
Allow the product to cool before removing covers or touching internal components.
Operate the product only from the type of external power source indicated on the electrical ratings label.
If you are not sure of the type of power source required, consult your service provider or local power
company.
To help avoid damaging your system, be sure the voltage selection switch (if provided) on the power
supply is set to match the power available at your location:
– 115 volts (V)/60 hertz (Hz) in most of North and South America and some Far Eastern countries such
as South Korea and Taiwan.
– 100 V/50 Hz in eastern Japan and 100 V/60 Hz in western Japan.
– 230 V/50 Hz in most of Europe, the Middle East, and the Far East.
Also be sure that attached devices are electrically rated to operate with the power available in your
location.
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D-Link DGS-108 Unmanaged Gigabit Ethernet Switch
General Precautions for Rack-Mountable Products
CAUTION: Installing systems in a rack without the front and side stabilizers
installed could cause the rack to tip over, potentially resulting in bodily injury under
certain circumstances. Therefore, always install the stabilizers before installing
components in the rack.
After installing system/components in a rack, never pull more than one component
out of the rack on its slide assemblies at one time. The weight of more than one
extended component could cause the rack to tip over and may result in serious
injury.
Safety Instructions (continued)
Use only approved power cable(s). If you have not been provided with a power cable for your system or
for any AC-powered option intended for your system, purchase a power cable that is approved for use in
your country. The power cable must be rated for the product and for the voltage and current marked on
the product's electrical ratings label. The voltage and current rating of the cable should be greater than
the ratings marked on the product.
To help prevent an electric shock, plug the system and peripheral power cables into properly grounded
electrical outlets. These cables are equipped with three-prong plugs to help ensure proper grounding. Do
not use adapter plugs or remove the grounding prong from a cable. If you must use an extension cable,
use a 3-wire cable with properly grounded plugs.
Observe extension cable and power strip ratings. Make sure that the total ampere rating of all products
plugged into the extension cable or power strip does not exceed 80 percent of the ampere ratings limit
for the extension cable or power strip.
To help protect your system from sudden, transient increases and decreases in electrical power, use a
surge suppressor, line conditioner, or uninterruptible power supply (UPS).
Position system cables and power cables carefully; route cables so that they cannot be stepped on or
tripped over. Be sure that nothing rests on any cables.
Do not modify power cables or plugs. Consult a licensed electrician or your power company for site
modifications. Always follow your local/national wiring rules.
When connecting or disconnecting power to hot-pluggable power supplies, if offered with your system,
observe the following guidelines:
– Install the power supply before connecting the power cable to the power supply.
– Unplug the power cable before removing the power supply.
– If the system has multiple sources of power, disconnect power from the system by
unplugging all power cables from the power supplies.
Move products with care; ensure that all casters and/or stabilizers are firmly connected to the system.
Avoid sudden stops and uneven surfaces.
Observe the following precautions for rack stability and safety. Also refer to the rack installation documentation
accompanying the system and the rack for specific caution statements and procedures.
Systems are considered to be components in a rack. Thus, "component" refers to any system as well as to various
peripherals or supporting hardware.
Before working on the rack, make sure that the stabilizers are secured to the rack, extended to the floor,
and that the full weight of the rack rests on the floor. Install front and side stabilizers on a single rack or
front stabilizers for joined multiple racks before working on the rack.
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D-Link DGS-108 Unmanaged Gigabit Ethernet Switch
NOTE: A qualified electrician must perform all connections to DC power and to
safety grounds. All electrical wiring must comply with applicable local or national
codes and practices.
CAUTION: Never defeat the ground conductor or operate the equipment in the
absence of a suitably installed ground conductor. Contact the appropriate electrical
inspection authority or an electrician if you are uncertain that suitable grounding is
available.
CAUTION: The system chassis must be positively grounded to the rack cabinet
frame. Do not attempt to connect power to the system until grounding cables are
connected. Completed power and safety ground wiring must be inspected by a
qualified electrical inspector. An energy hazard will exist if the safety ground cable
is omitted or disconnected.
Safety Instructions (continued)
Always load the rack from the bottom up, and load the heaviest item in the rack first.
Make sure that the rack is level and stable before extending a component from the rack.
Use caution when pressing the component rail release latches and sliding a component into or out of a rack; the
slide rails can pinch your fingers.
After a component is inserted into the rack, carefully extend the rail into a locking position, and then slide the
component into the rack.
Do not overload the AC supply branch circuit that provides power to the rack. The total rack load should not
exceed 80 percent of the branch circuit rating.
Ensure that proper airflow is provided to components in the rack.
Do not step on or stand on any component when servicing other components in a rack.
Protecting Against Electrostatic Discharge
Static electricity can harm delicate components inside your system. To prevent static damage, discharge static
electricity from your body before you touch any of the electronic components, such as the microprocessor. You
can do so by periodically touching an unpainted metal surface on the chassis.
You can also take the following steps to prevent damage from electrostatic discharge (ESD):
1. When unpacking a static-sensitive component from its shipping carton, do not remove the component
from the antistatic packing material until you are ready to install the component in your system. Just
before unwrapping the antistatic packaging, be sure to discharge static electricity from your body.
2. When transporting a sensitive component, first place it in an antistatic container or packaging.
3. Handle all sensitive components in a static-safe area. If possible, use antistatic floor pads, workbench
pads, and an antistatic grounding strap.
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D-Link DGS-108 Unmanaged Gigabit Ethernet Switch
SECTION 1
Introduction
Ethernet Technology
Switch Description
Features
Ports
Front-Panel Components
Ethernet Technology
Fast Ethernet Technology
The growing importance of LANs and the increasing complexity of desktop computing applications are fueling
the need for high performance networks. A number of high-speed LAN technologies are proposed to provide
greater bandwidth and improve client/server response times. Among them, Fast Ethernet, or 100BASE-T,
provides a non-disruptive, smooth evolution from 10BASE-T technology.
100Mbps Fast Ethernet is a standard specified by the IEEE 802.3 LAN committee. It is an extension of the
10Mbps Ethernet standard with the ability to transmit and receive data at 100Mbps, while maintaining the
Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Ethernet protocol.
Gigabit Ethernet Technology
Gigabit Ethernet is an extension of IEEE 802.3 Ethernet utilizing the same packet structure, format, and support
for CSMA/CD protocol, full duplex, flow control, and management objects, but with a tenfold increase in
theoretical throughput over 100Mbps Fast Ethernet and a one hundred-fold increase over 10Mbps Ethernet.
Since it is compatible with all 10Mbps and 100Mbps Ethernet environments, Gigabit Ethernet provides a
straightforward upgrade without wasting a company’s existing investment in hardware, software, and trained
personnel.
The increased speed and extra bandwidth offered by Gigabit Ethernet are essential to coping with the network
bottlenecks that frequently develop as computers and their busses get faster and more users use applications that
generate more traffic. Upgrading key components, such as your backbone and servers to Gigabit Ethernet can
greatly improve network response times as well as significantly speed up the traffic between your subnetworks.
Gigabit Ethernet enables fast optical fiber connections to support video conferencing, complex imaging, and
similar data-intensive applications. Likewise, since data transfers occur 10 times faster than Fast Ethernet,
servers outfitted with Gigabit Ethernet NIC’s are able to perform 10 times the number of operations in the same
amount of time.
In addition, the phenomenal bandwidth delivered by Gigabit Ethernet is the most cost-effective method to take
advantage of today and tomorrow’s rapidly improving switching and routing internetworking technologies.
Switching Technology
Another key development pushing the limits of Ethernet technology is in the field of switching technology. A
switch bridges Ethernet packets at the MAC address level of the Ethernet protocol transmitting among connected
Ethernet or fast Ethernet LAN segments.
Switching is a cost-effective way of increasing the total network capacity available to users on a local area
network. A switch increases capacity and decreases network loading by making it possible for a local area
network to be divided into different segments that do not compete with each other for network transmission
capacity, decreasing the load on each segment.
The switch acts as a high-speed selective bridge between the individual segments. Traffic that needs to go from
one segment to another (from one port to another) is automatically forwarded by the switch, without interfering
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D-Link DGS-108 Unmanaged Gigabit Ethernet Switch
with any other segments (ports). This allows the total network capacity to be multiplied, while still maintaining
the same network cabling and adapter cards.
For Fast Ethernet or Gigabit Ethernet networks, a switch is an effective way of eliminating problems of chaining
hubs beyond the “two-repeater limit.” A switch can be used to split parts of the network into different collision
domains, for example, making it possible to expand your Fast Ethernet network beyond the 205-meter network
diameter limit for 100BASE-TX networks. Switches supporting both traditional 10Mbps Ethernet and 100Mbps
Fast Ethernet are also ideal for bridging between existing 10Mbps networks and new 100Mbps networks.
Switching LAN technology is a marked improvement over the previous generation of network bridges, which
were characterized by higher latencies. Routers have also been used to segment local area networks, but the cost
of a router and the setup and maintenance required make routers relatively impractical. Today’s Switches are an
ideal solution to most kinds of local area network congestion problems.
Switch Description
The DGS-108 Switch is equipped with eight ports providing dedicated 10, 100, or 1000 Mbps bandwidth. These
ports can be used for connecting PCs, printers, servers, routers, Switches, hubs, and other network devices. The
eight multi-speed ports use standard twisted pair cabling and are ideal for segmenting networks into small,
connected subnets. Each port can support up to 2000 Mbps of throughput in full-duplex mode. This stand-alone
Switch enables the network to use some of the most demanding multimedia and imaging applications
concurrently with other user applications without creating bottlenecks.
Features
The DGS-108 8-Port 10/100/1000BASE-T Gigabit Ethernet Switch was designed for easy installation and high
performance in an environment where traffic on the network and the number of users increase continuously.
Eight 10/100/1000BASE-T Gigabit Ethernet ports
Cable Diagnostic function at Switch boot up
Supports Auto-Negotiation for 10/100/1000Mbps and duplex mode
Supports Auto-MDI/MDIX for each port
Supports Full/Half duplex transfer mode for 10 and 100Mbps
Supports Full-duplex transfer mode for 1000Mbps
Full wire speed reception and transmission
Store-and-Forward switching method
Supports 8K absolute MAC addresses
Supports 9600Bytes Jumbo Frames
Supports IEEE802.1p QoS (4 Queues)
Extensive front-panel diagnostic LEDs
IEEE 802.3x flow control for full duplex
Back pressure flow control for half duplex
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