D-Link xStack Manual

Information in this document is subject to change without notice.
© 2013 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.
February, 2013 P/N 651GS3420035G
FCC Warning
This equipment has been tested and found to comply with the limits for a Class A 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 manual, 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 A 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 A. 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 A. En un entorno doméstico, puede causar interferencias de radio, en cuyo case, puede
requerirse al usuario para que adopte las medidas adecuadas.
Attention!
Ceci est un produit de classe A. 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 A. 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
この装置は、クラス A情報技術装置です。この装置を家庭環境で使用すると電波妨害を引き起こすことがあります。こ
の場合には使用者が適切な対策を講ずるよう要求されることがあります。 VCCI-A
BSMI Notice
此為甲類的資訊技術設備，在居住環境中使用時，可能會造成射頻擾動，在這種情況下，使用者會被要求採取某些適當的對
策。

xStack® DGS-3420 Series Layer 2+ Managed Stackable Gigabit Switch Hardware Installation Reference Guide
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Table of Contents
Intended Readers................................................................................................................................................................ iv
Typographical Conventions................................................................................................................................................. iv
Notes, Notices, and Cautions.............................................................................................................................................. iv
Safety Instructions................................................................................................................................................................ v
Safety Cautions.................................................................................................................................................................. v
General Precautions for Rack-Mountable Products ......................................................................................................... vi
Protecting Against Electrostatic Discharge.......................................................................................................................vii
Chapter 1 Introduction ...................................................................................................................................................... 8
Switch Description................................................................................................................................................................8
Features................................................................................................................................................................................9
Ports ...................................................................................................................................................................................10
Front-Panel Components ...................................................................................................................................................12
LED Indicators....................................................................................................................................................................13
Rear Panel Components ....................................................................................................................................................15
Side Panel Components.....................................................................................................................................................16
Chapter 2 Installation ...................................................................................................................................................... 18
Package Contents ..............................................................................................................................................................18
Installation Guidelines ........................................................................................................................................................18
Installing the Switch without a Rack ................................................................................................................................19
Attaching Brackets to a Switch for Rack Mounting..........................................................................................................19
Mounting the Switch in a Standard 19" Rack ..................................................................................................................20
Power On (AC Power)........................................................................................................................................................20
Power Failure (AC Power) ...............................................................................................................................................20
Alarm Connector.................................................................................................................................................................20
Installing SFP and SFP+ Ports...........................................................................................................................................22
Connecting to a Redundant Power Supply ........................................................................................................................23
External Redundant Power System ...................................................................................................................................24
DPS-900...........................................................................................................................................................................24
DPS-800...........................................................................................................................................................................25
Chapter 3 Connecting the Switch .................................................................................................................................. 27
Switch to End Node............................................................................................................................................................27
Switch to Switch .................................................................................................................................................................27
Connect to a Network Backbone or Server........................................................................................................................28
Chapter 4 Introduction to Switch Management ........................................................................................................... 29
Management Options .........................................................................................................................................................29
Connecting the Console Port..............................................................................................................................................29
Connecting to the Switch for the first time..........................................................................................................................31
Connecting to the Management Port..................................................................................................................................31
Password Protection...........................................................................................................................................................32
Assigning IP Addresses......................................................................................................................................................32
SNMP Settings ...................................................................................................................................................................34
Traps................................................................................................................................................................................35
Management Information Base (MIB)..............................................................................................................................35
Chapter 5 Web-based Switch Configuration ................................................................................................................ 36
Introduction.........................................................................................................................................................................36
Logging onto the Web Manager.........................................................................................................................................36
Web-based User Interface..................................................................................................................................................37

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Areas of the User Interface..............................................................................................................................................37
Web Pages.........................................................................................................................................................................37
Appendix Section ................................................................................................................................................................ 39
Appendix A – Technical Specifications ..............................................................................................................................39
General ............................................................................................................................................................................39
Physical and Environmental.............................................................................................................................................39
Performance.....................................................................................................................................................................40
LED Indicators .................................................................................................................................................................41
Port Functions..................................................................................................................................................................43
Appendix B – Cables and Connectors ...............................................................................................................................46
Ethernet Cable.................................................................................................................................................................46
Console Cable .................................................................................................................................................................47
Redundant Power Supply (RPS) Cable...........................................................................................................................48
Appendix C – Module Specs and Cable Lengths...............................................................................................................50
Warranties & Technical Support........................................................................................................................................ 51

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Intended Readers
Typographical Conventions
Notes, Notices, and Cautions
Safety Instructions
The DGS-3420 Series Hardware Installation Guide contains information for set up and management of the Switch. This
manual is intended for network managers familiar with network management concepts and terminology. For all practical
reasons all the switches in this series will be simply refered to as the Switch throughout this manual. All example
screenshots are taken from the DGS-3420-28SC Switch. In some examples, where we refer to the Power over Ethernet
examples, we’ll use the DGS-3420-28PC Switch.
Typographical Conventions
Convention Description
[ ] In a command line, square brackets indicate an optional entry. For example: [copy
filename] means that optionally you can type copy followed by the name of the file. Do not
type the brackets.
Bold font Indicates a button, a toolbar icon, menu, or menu item. For example: Open the File menu
and choose Cancel. Used for emphasis. May also indicate system messages or prompts
appearing on screen. For example: You have mail. Bold font is also used to represent
filenames, program names and commands. For example: use the copy command.
Boldface Typewriter
Font
Indicates commands and responses to prompts that must be typed exactly as printed in the
manual.
Initial capital letter Indicates a window name. Names of keys on the keyboard have initial capitals. For
example: Click Enter.
Italics Indicates a window name or a field. Also can indicate a variables or parameter that is
replaced with an appropriate word or string. For example: type filename means that the
actual filename should be typed instead of the word shown in italic.
Menu Name > Menu
Option Menu Name > Menu Option Indicates the menu structure. Device > Port > Port Properties means the Port Properties menu option under the Port menu option that is
located under the Device menu.
Notes, Notices, and Cautions
A NOTE indicates important information that helps make better use of the device.
A NOTICE indicates either potential damage to hardware or loss of data and tells how to avoid the
problem.
A CAUTION indicates a potential for property damage, personal injury, or death.

xStack® DGS-3420 Series Layer 2+ Managed Stackable Gigabit Switch Hardware Installation Reference Guide
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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 need to
be reviewed and followed.
Safety Cautions
To reduce the risk of bodily injury, electrical shock, fire, and damage to the equipment observe the following precautions:
•Observe and follow service markings.
oDo not service any product except as explained in the system documentation.
oOpening or removing covers that are marked with the triangular symbol with a lightning bolt may expose
the user to electrical shock.
oOnly 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:
oDamage to the power cable, extension cable, or plug.
oAn object has fallen into the product.
oThe product has been exposed to water.
oThe product has been dropped or damaged.
oThe product does not operate correctly when the operating instructions are correctly followed.
•Keep your system away from radiators and heat sources. Also, do not block cooling vents.
•Do not spill food or liquids on system components, and never operate the product in a wet environment. If the
system gets wet, see the appropriate section in the troubleshooting guide or contact your trained service provider.
•Do not push any objects into the openings of the system. Doing so can cause fire or 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 unsure
of the type of power source required, consult your service provider or local power company.
•To help avoid damaging the system, be sure the voltage selection switch (if provided) on the power supply is set
to match the power available at the Switch’s location:
o115 volts (V)/60 hertz (Hz) in most of North and South America and some Far Eastern countries such as
South Korea and Taiwan
o100 V/50 Hz in eastern Japan and 100 V/60 Hz in western Japan
o230 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.
•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 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 using an extension cable is necessary, 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.

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•To help protect the 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:
oInstall the power supply before connecting the power cable to the power supply.
oUnplug the power cable before removing the power supply.
oIf 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.
General Precautions for Rack-Mountable Products
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.
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.
•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.
•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.
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
uncertain that suitable grounding is available.

xStack® DGS-3420 Series Layer 2+ Managed Stackable Gigabit Switch Hardware Installation Reference Guide
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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.
Protecting Against Electrostatic Discharge
Static electricity can harm delicate components inside the system. To prevent static damage, discharge static electricity
from your body before touching any of the electronic components, such as the microprocessor. This can be done by
periodically touching an unpainted metal surface on the chassis.
The following steps can also be taken 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 ready to install the component in the 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.

xStack® DGS-3420 Series Layer 2+ Managed Stackable Gigabit Switch Hardware Installation Reference Guide
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Chapter 1 Introduction
Switch Description
Features
Ports
Front-Panel Components
LED Indicators
Rear Panel Components
Side Panel Components
Switch Description
D-Link's DGS-3420 Series is a high performance member of the D-Link xStack® family. Ranging from 10/100/1000 Mbps
edge switches to core gigabit switches, the xStack® switch family has been future-proof designed to provide fault
tolerance, flexibility, port density, robust security and maximum throughput with a user-friendly management interface for
the networking professional.
The Series features the following list of switches:
•DGS-3420-28SC: Twenty SFP ports (100/1000Mbps), Four Combo Copper/SFP ports (10/100/1000Mbps and
100/1000Mbps), Four SFP+ ports (10GE), Layer 2+ Stackable Managed Switch.
•DGS-3420-28TC: Twenty Copper ports (10/100/1000Mbps), Four Combo Copper/SFP ports (10/100/1000Mbps
and 100/1000Mbps), Four SFP+ ports (10GE), Layer 2+ Stackable Managed Switch.
•DGS-3420-26SC: Twenty SFP ports (100/1000Mbps), Four Combo Copper/SFP ports (10/100/1000Mbps and
100/1000Mbps), Two SFP+ ports (10GE), Layer 2+ Stackable Managed Switch.
•DGS-3420-28PC: Twenty Copper PoE ports (10/100/1000Mbps), Four Combo Copper/SFP ports
(10/100/1000Mbps and 100/1000Mbps), Four SFP+ ports (10GE), Layer 2+ Stackable Managed Switch.
•DGS-3420-52T: Fourty-eight Copper ports (10/100/1000Mbps), Four SFP+ ports (10GE), Layer 2+ Stackable
Managed Switch.
•DGS-3420-52P: Fourty-eight Copper PoE ports (10/100/1000Mbps), Four SFP+ ports (10GE), Layer 2+
Stackable Managed Switch.
This cost effective Gigabit Switch provides an affordable solution for administrators to upgrade their networks to high
speed Gigabit connections. The dedicated stacking ports offer up to 40G bi-directional bandwidth, which makes the DGS-
3420 Series also suitable as a backbone solution for SMBs. The advanced ACL and user authentication functions on the
Switch extend the network security coverage from core to the edge. A unique D-Link Safeguard Engine protects the DGS-
3420 Series from the threat of worms and viruses, thereby increasing overall reliability, serviceability, and availability
The Switch has a combination of 1000BASE-T ports and SFP ports that may be used in uplinking various network devices
to the Switch, including PCs, hubs and other switches to provide a gigabit Ethernet uplink in full-duplex mode. The SFP
(Small Form Factor Portable) combo ports are used with fiber-optical transceiver cabling in order to uplink various other
networking devices for a gigabit link that may span great distances.

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Features
The list of features below highlights the significant features of the Switch.
•Supports Virtual Stacking. D-Link Single IP Management (SIM).
•Supports Physical Stacking, using the SFP+ ports with 40Gb (Full Duplex) in topologies Linear and Ring.
•Supports a 16K MAC address table.
•Supports Flow Control (802.3x) in full-duplex compliant.
•Supports Jumbo Frames of up to 13Kbytes
•Supports Spanning Tree with 802.1D 2004 STP/RSTP and 802.1Q 2005 MSTP.
•Supports Loopback Detection (LBD).
•Supports Link Aggregation (802.3ad and 802.3AX) with a maximum of 32 groups per Switch.
•Supports Mirroring with RSPAN.
•Supports Layer 2 Protocol Tunneling (L2PT) with tunneling across GVRP and STP.
•Supports Ethernet Ring Protection Switching (ERPS) including Multi-ERPS of up to 12 ERPS rings.
•Supports Layer 2 Multicast Filtering.
•Supports IGMP Snooping (v1/2/3) with up to 960 snooping groups and 64 static multicast addresses and MLD
Snooping with up to 480 snooping groups and 64 static multicast addresses. IGMP Snooping and MLD Snooping
share 1024 snooping groups.
•Supports IGMP and MLD Proxy.
•Supports Limited IP Multicast (IGMP Filtering).
•Supports Virtual LAN (802.1Q) with up to 4K static VLAN groups and 255 dynamic VLAN groups.
•Supports Port-based and MAC-based VLAN.
•Supports VLAN trunking and Asymmetric VLAN.
•Supports ISM, Private, Subnet-based, Voice, and Double VLAN (Q-in-Q).
•Supports VLAN Translation.
•Supports IP Interfaces with up to 256 IP interfaces.
•Supports Loopback Interface of up to 8 IPv4 interfaces.
•Supports Gratuitous ARP and ARP Proxy.
•Supports IPv6 Tunneling.
•Supports Multiple IP interfaces per VLAN.
•Supports IPv6 Ready Phase 2 compliancy.
•Supports Static and Dynamic Routing.
•Supports Routing Information Protocol (RIP) including RIPv1, RIPv2, and RIPng.
•Supports Multicast Replication.
•Supports Quality of Service (QoS) with Queue Handling, Class of Service (CoS), Three Color Marking, Bandwidth
Control, and Time-based QoS.
•Supports Access Control List (ACL) with Ingress ACL, Egress ACL, Time-based ACL, ACL Statistics, and CPU
Interface Filtering.
•Supports Secure Shell (SSHv2) with IPv4/IPv6 access.
•Supports Secure Sockets Layer (SSL) versions 1, 2, and 3 with IPv4/IPv6 access.
•Supports Port Security of up to 3328 MAC addresses for port, system and VLAN.
•Supports Broadcast, Multicast, and Unicast Control.
•Supports Traffic Segmentation
•Supports D-Link SafeGuard Engine.
•Supports BPDU Attack Protection and ARP Spoofing Prevention.
•Supports IP-MAC-Port Binding (IMPB). This feature includes IP Inspection, ARP Inspection, IPv4/IPv6 Address
Binding, DHCPv4 Binding, DHCPv6 Binding, and IPv6 ND Snooping.

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•Supports DHCP Server Screening and DHCP Client Filtering.
•Supports DoS Attack Prevention.
•Supports Port-based Network Access Control (PNAC) better known as 802.1X. This feature includes Local and
RADIUS databasis, Port-based Access Control, and MAC-based Access Control (MAC).
•Supports Web-based Access Control (WAC) that also supports HTTPS.
•Supports Japanese Web-based Access Control (JWAC).
•Supports Network Access Protection (NAP) using 802.1X guest VLAN.
•Supports Guest VLAN.
•Supports 4 Level User Account Priledges called Adminstator, Operator, Power-user, and User.
•Supports Compound Authentication.
•Supports Link Layer Discovery Protocol (LLDP) with LLDP-MED.
•Supports Accessibility using multiple interfaces like the Command Line Interface (CLI), Web-based Graphical
User Interface (Web-based GUI), and more.
•Supports Telnet Server and Client from IPv4 and IPv6.
•Supports Trivial File Transfer Protocol (TFTP) Client.
•Supports Simple Network Management Protocol (SNMP) version 1, 2c, and 3. Also supports SNMP Traps.
•Supports sFLOW, BOOTP and DHCP Client.
•Supports Dynamic Host Configuration Protocol (DHCP) Server and Relay.
•Supports Trap, Log, and Alarm Severity Control.
•Support Multiple Images and Multiple Configurations.
•Suports Flash File System using either a FAT16 or FAT32 SD Card.
•Supports Password Encryption and Password Recovery.
•Supports Simple Network Time Protocol (SNTP) with the Precision Time Protocol (PTP).
•Supports Network Load Balancing (NLB) with both IPv4 and IPv6 support.
•Supports Simple Mail Transfer Protocol (SMTP).
•Support Ethernet Link Object Access Method (OAM) using 802.3ah D-Link Unidirectional Link Detection (DULD).
•Supports Connectivity Fault Management (CFM) using 802.1ag.
•Support Power Saving using two methods called Link Status Mode and Cable Length Mode.
•Support Time-based Power-over-Ethernet (PoE).
•Supports Access Authentication Control utilizing TACACS, XTACACS, TACACS+, and RADIUS protocols.
•Supports IEEE 802.3az compliance (Hardware Version :B1).
•Supports MIBs like MIBII, Bridge MIB, SNMPv2 MIB, RMON MIB, RMONv2 MIB, Ether-like MIB, 802.3 MAU MIB,
802.1p MIB, IF MIB, RADIUS Authentication Client MIB, RIPv2 MIB, IP Forwarding Table MIB (CIDR), RADIUS
Accounting Client MIB, Ping MIB, Trace out MIB, L2 Specific MIB, L3 Specific MIB, Private MIB, Entity MIB, and
ZoneDefense MIB.
Ports
The following table lists the ports that are present within each switch.
DGS-3420-28SC Twenty SFP ports (100/1000Mbps).
Four Combo Copper/SFP ports (10/100/1000Mbps and
100/1000Mbps).
Four SFP+ ports (10GE).
DGS-3420-28TC Twenty Copper ports (10/100/1000Mbps).
Four Combo Copper/SFP ports (10/100/1000Mbps and
100/1000Mbps).
Four SFP+ ports (10GE).

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DGS-3420-26SC Twenty SFP ports (100/1000Mbps).
Four Combo Copper/SFP ports (10/100/1000Mbps and
100/1000Mbps).
Two SFP+ ports (10GE).
DGS-3420-28PC Twenty Copper PoE ports (10/100/1000Mbps).
Four Combo Copper/SFP ports (10/100/1000Mbps and
100/1000Mbps).
Four SFP+ ports (10GE).
DGS-3420-52T Fourty-eight Copper ports (10/100/1000Mbps).
Four SFP+ ports (10GE).
DGS-3420-52P Fourty-eight Copper PoE ports (10/100/1000Mbps).
Four SFP+ ports (10GE).
•All the switches are equipt with one RJ-45 Console port (a special console cable with a DB9 interface is provided
to connect the Switch to a PC)
•All the switches are equipt with one Redundant Power Supply (RPS) outlet for optional external RPS
•All the switches are also equipt with one Alarm Port and SD Card Slot.
NOTE: For customers interested in D-View, D-Link Corporation's proprietary SNMP management software,
go to http://dview.dlink.com.tw/ and download the software and manual.

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Front-Panel Components
The front panel of the DGS-3420 Series consists of a Management and Console port, LED indicators for Power, Console,
an Alarm Port, and stacking ID LED’s. A separate table below describes LED indicators in more detail.
Figure 1- 1. Front panel view of a DGS-3420-28SCSwitch
Figure 1- 2. Front panel view of a DGS-3420-28TC Switch
Figure 1- 3. Front panel view of a DGS-3420-26SC Switch
Figure 1- 4. Front panel view of a DGS-3420-28PC Switch
Figure 1- 5. Front panel view of a DGS-3420-52T Switch
Figure 1- 6. Front panel view of a DGS-3420-52P Switch

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LED Indicators
The Switch front panel presents LED indicators for Power, Console, RPS, Master (stack control), SD, Stack ID and
Link/Act indicators for all ports including the Gigabit Ethernet ports. The DGS-3420-28PC and DGS-3420-52P switches
are equipt with an additional PoE light, to indication whether the ports are running in Power over Ethernet mode.
Figure 1- 7. LED indicators for the DGS-3420-28SC
Figure 1- 8. LED indicators for the DGS-3420-28TC
Figure 1- 9. LED indicators for the DGS-3420-26SC
Figure 1- 10. LED indicators for the DGS-3420-28PC
Figure 1- 11. LED indicators for the DGS-3420-52T

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Figure 1- 12. LED indicators for the DGS-3420-52P
LED Description
Power This LED will light green after powering the Switch on to indicate the ready state of the
device. The indicator is dark when the Switch is no longer receiving power (i.e. powered
off).
Console This LED will blink green during the Power-On Self Test (POST). When the POST is
finished, the LED goes dark. The indicator will light steady green when a user is logged in
through the console port.
RPS This LED will light green if the Redundant Powers Supply is in use. If the indicator is off, the
RPS is not in use. When the switch detects that the RPS is connected, the light will be
blinking.
SD This LED will light green if a Secure Digital (SD) card is plugged in. When the Switch is
reading or writing, the indicator will blink green. No light LED means there is no link. A solid
red LED indicates SD card failure.
Stack ID For standalone Switches, this will display number “1”. For stacked Switches, this indicates
the position in the stacking box ID. The box ID is assigned either by the user (static mode)
or by the system (automatic mode). When “1” to “12” is displayed, this indicates the
stacking position of the switch. An “H” indicates the device was assigned as the stacking
Master. “h“ means the device was selected to be the Backup Master. A “G” is displayed
when the Safeguard Engine feature enters the exhausted mode.
Link/Act LEDs The Switch has LED indicators for Link and Activity. The LED will light steady green when
there is a secure connection (or link) to a 1000Mbps Ethernet device at any of the ports, or
steady orange when there is a secure connection (or link) to a 10/100Mbps Ethernet device
at any of the ports. The LED will blink green when a 1000Mbps port is active, or blink
orange when a 10/100Mbps port is active. The LED remains dark when there is no link or
activity.
PoE Only the DGS-3420-28PC and the DGS-3420-52P switches are equipt with a PoE LED.
When this light is on with a solid green light, it means that the corresponding ports are
feeding power to the PoE devices plugged in. When this light is on with a solid orange light,
it means that the port is in an error condition state. When this light is off, it means that the
ports are not supplying power to the devices plugged into the ports.

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Rear Panel Components
The rear panel contains an AC/DC power connector and an outlet for an external redundant power supply.
Figure 1- 13. Rear panel view of a DGS-3420-28SC Switch
Figure 1- 14. Rear panel view of a DGS-3420-28TC Switch
Figure 1- 15. Rear panel view of a DGS-3420-26SC Switch
Figure 1- 16. Rear panel view of a DGS-3420-28PC Switch
Figure 1- 17. Rear panel view of a DGS-3420-52T Switch
Figure 1- 18. Rear panel view of a DGS-3420-52P Switch
The AC power connector is a standard three-pronged connector that supports the power cord. Plug-in the female
connector of the provided power cord into this socket, and the male side of the cord into a power outlet. The Switch
automatically adjusts the power setting to any supply voltage in the range from 100~240 VAC at 50~60 Hz. An optional
external Redundant Power Supply (DPS-500 for DGS-3420-28TC/28SC/26SC/52T, DPS-700 for DGS-3420-28PC/52P)
can be plugged into the RPS outlet displayed above. When the internal power fails, this optional external RPS will take
over all the power immediately and automatically.

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Side Panel Components
The system heat vents located on each side dissipate heat. Do not block these openings. Leave at least 6 inches of space
at the rear and sides of the Switch for proper ventilation. Be reminded that without proper heat dissipation and air
circulation, system components might overheat, which could lead to system failure or even severely damage components.
Figure 1- 19. Side panels of the DGS-3420-28SC Switch
Figure 1- 20. Side panels of the DGS-3420-28TC Switch
Figure 1- 21. Side panels of the DGS-3420-26SC Switch
Figure 1- 22. Side panels of the DGS-3420-28PC Switch

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Figure 1- 23. Side panels of the DGS-3420-52T Switch
Figure 1- 24. Side panels of the DGS-3420-52P Switch

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Chapter 2 Installation
Package Contents
Installation Guidelines
Power On (AC Power)
Alarm Connector
Installing SFP and SFP+ Ports
Connecting to a Redundant Power Supply
External Redundant Power System
Package Contents
Open the shipping carton of the Switch and carefully unpack its contents. The carton should contain the following items:
•One DGS-3420 Series Switch
•One AC power cord
•One RJ-45 to RS-232 console cable
•One mounting kit (two brackets and screws)
•Four rubber feet with adhesive backing
•One CD kit for CLI reference guide/Web UI reference guide/Hardware Installation Guide/D-View module
If any item is missing or damaged, please contact your local D-Link Reseller for replacement.
Installation Guidelines
Please follow these guidelines for setting up the Switch:
•Install the Switch on a sturdy, level surface that can support at least 6.6 lb. (3kg – This is without PoE
functionality) of weight. Do not place heavy objects on the Switch.
•The power outlet should be within 1.82 meters (6 feet) of the Switch.
•Visually inspect the power cord and see that it is fully secured to the AC power port.
•Make sure that there is proper heat dissipation from and adequate ventilation around the Switch. Leave at least
10 cm (4 inches) of space at the front and rear of the Switch for ventilation.
•Install the Switch in a fairly cool and dry place for the acceptable temperature and humidity operating ranges.
•Install the Switch in a site free from strong electromagnetic field generators (such as motors), vibration, dust, and
direct exposure to sunlight.
•When installing the Switch on a level surface, attach the rubber feet to the bottom of the device. The rubber feet
cushion the Switch, protect the casing from scratches and prevent it from scratching other surfaces.

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Installing the Switch without a Rack
First, attach the rubber feet included with the Switch if installing on a desktop or shelf. Attach these cushioning feet on the
bottom at each corner of the device. Allow enough ventilation space between the Switch and any other objects in the
vicinity.
Figure 2–1 Attach rubber feet to the switch.
Attaching Brackets to a Switch for Rack Mounting
The Switch is mounted to a standard 19" rack using mounting brackets. Use the following diagrams as a guide.
Figure 2–2 Attach mounting brackets to the switch
Fasten the mounting brackets to the Switch using the screws provided. With the brackets attached securely, the Switch
can be mounted in a standard rack, as shown below.
NOTE: Please review the Installation Guidelines above before installing the Switch in a rack. Make
sure there is adequate space around the Switch to allow for proper air flow, ventilation and cooling.