D-Link DGS-1250 Series Manual

DGS-1520 Series Gigabit Ethernet Smart Managed Switch
Hardware Installation Guide

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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Information in this document is subject to change without notice. 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.
© 2020 D-Link Corporation. All rights reserved.
FCC Compliance Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any interference received, including interference that may cause
undesired operation.
D-Link Corporate
17595 Mt. Hermann Street
Fountain Valley, CA 92708
[phone]
CE Mark Warning
This equipment is compliant with Class A of CISPR 32. In a residential environment, this equipment may cause radio interference.
Avertissement Concernant la Marque CE
Cet équipement est conforme à la classe A de la norme CISPR 32. Dans un environnement résidentiel, cet équipement peut
provoquer des interférences radio.
VCCI Warning
この装置は、クラス A機器です。この装置を住宅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
此為甲類資訊技術設備，於居住環境中使用時，可能會造成射頻擾動，在此種情況下，使用者會被要求採取某些適當的對策。
Safety Compliance
Warning: Class 1 Laser Product: When using a fiber optic media expansion module, never look at the transmit laser while it is
powered on. In addition, never look directly at the fiber TX port and fiber cable ends when they are powered on.
Avertissement: Produit Laser de Classe 1: Ne regardez jamais le laser tant qu’il est sous tension. Ne regardez jamais
directement le port TX (Transmission) à fibres optiques et les embouts de câbles à fibres optiques tant qu’ils sont sous tension.

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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Table of Contents
Intended Readers ................................................................................................................................................... v
Typographical Conventions .................................................................................................................................... v
Notes and Cautions ................................................................................................................................................ v
1. Introduction........................................................................................................................................................... 1
Switch Description .................................................................................................................................................. 1
Package Contents .................................................................................................................................................. 1
2. Hardware Components ........................................................................................................................................ 2
Front Panel Components........................................................................................................................................ 2
Front Panel LED Indicators ............................................................................................................................... 4
Rear Panel Components ........................................................................................................................................ 6
Rear Panel LED Indicators................................................................................................................................ 8
Side Panel Components ......................................................................................................................................... 9
Smart Fans ......................................................................................................................................................10
3. Installation ........................................................................................................................................................... 11
Installation Guidelines........................................................................................................................................... 11
Installing the Switch without a Rack .....................................................................................................................11
Installing the Switch in a Standard 19" Rack........................................................................................................ 12
Installing Transceivers into the Transceiver Ports................................................................................................13
Connecting AC Power to the Switch.....................................................................................................................14
Installing the AC Power Cord Retainer............................................................................................................14
Connecting PoH to the Switch.............................................................................................................................. 17
Installing the Redundant Power Supply (RPS).....................................................................................................18
Connecting the DPS-700 RPS to the Switch...................................................................................................18
4. Switch Connections ........................................................................................................................................... 20
Stacking the Switch .............................................................................................................................................. 20
Switch to Switch.................................................................................................................................................... 23
Switch to Server....................................................................................................................................................24
Switch to End Node .............................................................................................................................................. 24
5. Switch Management ........................................................................................................................................... 25
Management Options ...........................................................................................................................................25
Command Line Interface (CLI) .............................................................................................................................25
Connecting to the Console Port ......................................................................................................................25
Logging into the CLI ........................................................................................................................................26
Creating a User Account .................................................................................................................................26
Configuring the IP Address.............................................................................................................................. 26
Web User Interface (Web UI) ............................................................................................................................... 27
Connecting to the Web UI ............................................................................................................................... 27
Logging into the Web UI.................................................................................................................................. 27
Web Interface Navigation ................................................................................................................................28
SNMP-based Management .................................................................................................................................. 29
Connecting using SNMP .................................................................................................................................29
Traps................................................................................................................................................................29
Management Information Base (MIB) .............................................................................................................29
Appendix A - Technical Specifications....................................................................................................................... 30
Appendix B - Cables and Connectors......................................................................................................................... 35
Ethernet Cable......................................................................................................................................................35
Console Cable ...................................................................................................................................................... 36

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Redundant Power Supply (RPS) Cable................................................................................................................37
Appendix C - ERPS Information .................................................................................................................................. 38
Safety/Sécurité .............................................................................................................................................................. 39
Safety Instructions ................................................................................................................................................ 39
Safety Cautions ............................................................................................................................................... 39
Consignes de sécurité ..........................................................................................................................................40
Précautions de sécurité ...................................................................................................................................40
General Precautions for Rack-Mountable Products .............................................................................................42
Protecting Against Electrostatic Discharge........................................................................................................... 43
Warranty & Technical Support .................................................................................................................................... 44

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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Intended Readers
The DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide contains detailed
information about the hardware specifications of the switches in this series. It also contains brief information on how to
configure and manage a switch in this series. This manual is intended for advanced level users that are familiar with
network management concepts and terminology.
Typographical Conventions
Convention Description
Boldface Font This convention is used to place emphasis on keywords. It also indicates a button,
toolbar icon, menu, menu item, system message, or a prompt appearing on the
screen. For example, click the Apply button.
Initial capital letter This convention is used to indicate a window name or keyboard key. For example,
press the Enter key.
Blue Courier Font
This convention is used to represent a CLI example.
Notes and Cautions
NOTE: A note indicates important information that helps you make better use of your device.
CAUTION: A caution indicates a potential for property damage, personal injury, or death.
ATTENTION:Une précaution indique un risque de dommage matériel, de blessure corporelle ou de
mort.

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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1. Introduction
Switch Description
Package Contents
Switch Description
The DGS-1520 series is the latest next generation of Smart Managed switches from D-Link. Switches in this series
feature a wide selection of different ports types and speeds that can be used to interconnect a variety of networking
devices to communicate with each other. The SFP+ ports, with fiber-optical cabling, can be used to uplink connections
that may span over great distances. Switches in this series also implement D-Link’s innovative third generation Green
Ethernet technology (IEEE 802.3az) to save power from links that are inactive by turning LEDs off based on a
customized schedule and by allowing ports to enter a hibernated state automatically.
In the DGS-1520 Series, the following switches are available: DGS-1520-28, DGS-1520-28MP, DGS-1520-52, and
DGS-1520-52MP. Some features, throughout this guide, will apply to all the switches within the DGS-1520 Series.
When referring to these universal features, we will simply refer to the product as the Switch.
Package Contents
Open the shipping carton of the Switch and carefully unpack its contents. The carton should contain the following
items:
•One DGS-1520 series switch
•One AC power cord
•One AC power cord retainer set
•One console cable (RJ45 to RS-232)
•Four rubber feet with adhesive backing
•One rack mounting kit, containing two brackets and a number of screws
•One quick installation guide
NOTE: If any item is missing or damaged, please contact your local D-Link reseller for replacement.

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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2. Hardware Components
Front Panel Components
Rear Panel Components
Side Panel Components
Front Panel Components
The front panel features components like LED indicators, a reset button, a Console port, and a variety of Ethernet
ports. These components are described in detail below.
This following table lists the front panel components on all the switches in the series:
Port Description
Reset Button The reset button is used to reboot the switch or to reset the switch to its factory
default settings depending on how long this button is pressed.
•Press and hold for less than 5 seconds - This reboots the Switch. All
unsaved configurations will be lost.
•Press and hold for between 5 and 10 seconds - This reboots the Switch
and restarts the ZTP function. All unsaved configurations will be lost.
•Press and hold for more than 10 seconds - This resets the software
configuration on the Switch to the factory default settings.
Console Port The console port is used to connect to the CLI of the switch. The connection is out-
of-band and the console cable (included in the package) must be used for the
connection.
Figure 2-1 DGS-1520-28 Front Panel
This following table lists the front panel components unique to the DGS-1520-28:
Port Type Port Number Description
RJ45 Port
(10/100/1000 Mbps)
Ports 1 to 24 This switch is equipped with 24 RJ45 Ethernet ports that can
operate at 10 Mbps, 100 Mbps, and 1 Gbps wire-speeds.
RJ45 Port
(1/10 Gbps)
Ports 25 to 26 This switch is equipped with 2RJ45 Ethernet ports that can
operate at 1 Gbps and 10 Gbps wire-speeds.
SFP+ Ports
(1/10 Gbps)
Ports 27 to 28 This switch is equipped with 2SFP/SFP+ ports that can
operate at 1 Gbps and 10 Gbps wire-speeds and support a
wide collection of SFP/SFP+ transceivers.
Figure 2-2 DGS-1520-28MP Front Panel

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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This following table lists the front panel components unique to the DGS-1520-28MP:
Port Type Port Number Description
RJ45 PoE Port
(10/100/1000 Mbps)
Ports 1 to 20 This switch is equipped with 20 RJ45 PoE ports that can
operate at 10 Mbps, 100 Mbps, and 1 Gbps wire-speeds and
supply IEEE 802.3af/at power to PDs.
RJ45 PoE Port
(100/1000/2500 Mbps)
Ports 21 to 24 This switch is equipped with 4RJ45 PoE ports that can
operate at 100 Mbps, 1 Gbps, and 2.5 Gbps wire-speeds and
supply IEEE 802.3af/at power to PDs.
RJ45 Port
(1/10 Gbps)
Ports 25 to 26 This switch is equipped with 2RJ45 Ethernet ports that can
operate at 1 Gbps and 10 Gbps wire-speeds.
SFP+ Ports
(1/10 Gbps)
Ports 27 to 28 This switch is equipped with 2SFP/SFP+ ports that can
operate at 1 Gbps and 10 Gbps wire-speeds and support a
wide collection of SFP/SFP+ transceivers.
Figure 2-3 DGS-1520-52 Front Panel
This following table lists the front panel components unique to the DGS-1520-52:
Port Type Port Number Description
RJ45 Port
(10/100/1000 Mbps)
Ports 1 to 48This switch is equipped with 48 RJ45 Ethernet ports that can
operate at 10 Mbps, 100 Mbps, and 1 Gbps wire-speeds.
RJ45 Port
(1/10 Gbps)
Ports 49 to 50 This switch is equipped with 2RJ45 Ethernet ports that can
operate at 1 Gbps and 10 Gbps wire-speeds.
SFP+ Ports
(1/10 Gbps)
Ports 51 to 52 This switch is equipped with 2SFP/SFP+ ports that can
operate at 1 Gbps and 10 Gbps wire-speeds and support a
wide collection of SFP/SFP+ transceivers.
Figure 2-4 DGS-1520-52MP Front Panel
This following table lists the front panel components unique to the DGS-1520-52MP:
Port Type Port Number Description
RJ45 PoE Port
(10/100/1000 Mbps)
Ports 1 to 44 This switch is equipped with 44 RJ45 PoE ports that can
operate at 10 Mbps, 100 Mbps, and 1 Gbps wire-speeds and
supply IEEE 802.3af/at power to PDs.
RJ45 PoE Port
(100/1000/2500 Mbps)
Ports 45 to 48 This switch is equipped with 4RJ45 PoE ports that can
operate at 100 Mbps, 1 Gbps, and 2.5 Gbps wire-speeds and
supply IEEE 802.3af/at power to PDs.
RJ45 Port
(1/10 Gbps)
Ports 49 to 50 This switch is equipped with 2RJ45 Ethernet ports that can
operate at 1 Gbps and 10 Gbps wire-speeds.

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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Port Type Port Number Description
SFP+ Ports
(1/10 Gbps)
Ports 51 to 52 This switch is equipped with 2SFP/SFP+ ports that can
operate at 1 Gbps and 10 Gbps wire-speeds and support a
wide collection of SFP/SFP+ transceivers.
Front Panel LED Indicators
The LED indicators provide valuable information in a variety of ways like their color, blinking times, and location.
Figure 2-5 DGS-1520-28 Front Panel LED Indicators
Figure 2-6 DGS-1520-28MP Front Panel LED Indicators
Figure 2-7 DGS-1520-52 Front Panel LED Indicators
Figure 2-8 DGS-1520-52MP Front Panel LED Indicators
The front panel LED indicators (per device) are described in the following table:
LED Color Status Description
Power Green On (Solid) Power on
On (Blinking) Performing system self-test
Off Power off
RPS
(PoE Switches Only)
Green On (Solid) RPS on
Off RPS off
Console Green On (Solid) Console session is active (user logged in)
Off Console session is inactive (user logged out)

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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LED Color Status Description
Fan Error Green On (Solid) Normal operation (diagnostics test passed)
Red On (Solid) Fan off (due to fan runtime failure)
Link/Act Mode
(PoE Switches Only)
Green On (Solid) Link/Act/Speed mode selected (via Mode button)
Off PoE mode selected (via Mode button)
PoE Mode
(PoE Switches Only)
Green On (Solid) PoE mode selected (via Mode button)
Off Link/Act/Speed mode selected (via Mode button)
Stack ID
(7-segment LED)
Green On (Solid) 1to 8The stacking ID number of the switch in the stack
On (Solid) HThe switch is the master switch in the stack
On (Solid) hThe switch is the backup master switch in the stack
On (Solid) eThere was an error in the system’s self-test
On (Solid) GThe Safeguard engine entered the exhausted mode
The front panel LED indicators (per RJ45 port) are described in the following table:
LED Color Status Description
Link/Act
(1G, 10/100M)
(top of each port)
Green On (Solid) Active connection at 1 Gbps through the port
On (Blinking) Data transmitted and received through the port
Amber On (Solid) Active connection at 10/100 Mbps through the port
On (Blinking) Data transmitted and received through the port
Off Off Inactive connection or no link present
Link/Act
(2.5G, 100M/1G)
(PoE Switches Only)
(top of each port)
Green On (Solid) Active connection at 2.5 Gbps through the port
On (Blinking) Data transmitted and received through the port
Amber On (Solid) Active connection at 100 Mbps or 1 Gbps through port
On (Blinking) Data transmitted and received through the port
Off Off Inactive connection or no link present
Link/Act
(10G, 1G)
(top of each port)
Green On (Solid) Active connection at 10 Gbps through the port
On (Blinking) Data transmitted and received through the port
Amber On (Solid) Active connection at 1 Gbps through the port
On (Blinking) Data transmitted and received through the port
Off Off Inactive connection or no link present
PoE OK/Fail
(PoE Switches Only)
(top of each port)
Green On (Solid) Power being supplied to PD through the port
Amber On (Solid) An error condition is occurring
Off Off No power being supplied through the port
The front panel LED indicators (per SFP+ port) are described in the following table:
LED Color Status Description
Link/Act
(top of each port)
Green On (Solid) Active connection at 10 Gbps through the port
On (Blinking) Data transmitted and received through the port
Amber On (Solid) Active connection at 1 Gbps through the port
On (Blinking) Data transmitted and received through the port
Off Off Link down or no link

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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The behavior of the LEDs during the booting or rebooting process is described in the following table:
Switch LED(s) Behavior
DGS-1520-28
DGS-1520-52
Power LED Blinks green when the switch is powered on.
Then, lights solid green until the system is ready.
Console LED Lights solid green when the switch is powered on.
Then, returns to normal operation when the system is ready.
Fan LED Lights solid green when the switch is powered on.
Then, returns to normal operation when the system is ready.
Stacking LED Lights solid green when the switch is powered on.
Then, returns to normal operation when the system is ready.
Link/Act LEDs Light solid green and amber when the switch is powered on.
Then, blinks green until the system is ready.
DGS-1520-28MP
DGS-1520-52MP
Power LED Blinks green when the switch is powered on.
Then, lights solid green until the system is ready.
Console LED Lights solid green when the switch is powered on.
Then, returns to normal operation when the system is ready.
Fan LED Lights solid green when the switch is powered on.
Then, returns to normal operation when the system is ready.
Stacking LED Lights solid green when the switch is powered on.
Then, returns to normal operation when the system is ready.
Link/Act Mode
LED
Lights solid green when the switch is powered on.
Then, returns to normal operation when the system is ready.
Link/Act LEDs Light solid green and amber when the switch is powered on.
Then, blinks green until the system is ready.
Rear Panel Components
The rear panel features components like an AC power socket, a security lock, an electrical ground point, and more.
These components are described in detail below.
This following table lists the front panel components on all the switches in the series:
Port Description
AC Power Connector The AC power cord (included in the package) can be plugged into this receptacle
to supply the switch with 100-240 VAC power at 50-60 Hz.
Power Cord Retainer Hole The power cord retainer hole is used to insert the power cord retainer to secure the
AC power cord.
Switch GND Use an electrical grounding wire and connect one end of the wire to the switch
GND and the other end of the wire to an electrical grounding point most commonly
found on the Switch mounting rack itself.
Security Lock The Kensington-compatible security lock can be used to connect the Switch to a
secure immovable device. Insert the lock into the notch and turn the key to secure
the lock. The lock-and-cable apparatus should be purchased separately.

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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Figure 2-9 DGS-1520-28 Rear Panel
This following table lists the front panel components unique to the DGS-1520-28:
Port Description
MGMT Port
(PoH IN Port)
The RJ45 Management (MGMT) port is an IP-based, Out-Of-Band (OOB) port for
Telnet, Web, or SNMP management that operates at 10/100/1000 Mbps wire-
speed. This port can be used to configure the Switch without being connected to
the network.
The MGMT port can also be used to supply the Switch with 90W DC power using
Power over HDBaseT. This can be used as the main power source or as the
secondary power source to the Switch.
Figure 2-10 DGS-1520-28MP Rear Panel
This following table lists the front panel components unique to the DGS-1520-28MP:
Port Description
Redundant Power Supply The RPS port can be used to connect an optional external load-sharing RPS to the
Switch. When the internal power fails, the external RPS will immediately supply
power to the Switch automatically.
Figure 2-11 DGS-1520-52 Rear Panel
This following table lists the front panel components unique to the DGS-1520-52:
Port Description
MGMT Port
(PoH IN Port)
The RJ45 Management (MGMT) port is an IP-based, Out-Of-Band (OOB) port for
Telnet, Web, or SNMP management that operates at 10/100/1000 Mbps wire-
speed. This port can be used to configure the Switch without being connected to
the network.
The MGMT port can also be used to supply the Switch with 90W DC power using
Power over HDBaseT. This can be used as the main power source or as the
secondary power source to the Switch.
Figure 2-12 DGS-1520-52MP Rear Panel

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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This following table lists the front panel components unique to the DGS-1520-52MP:
Port Description
Redundant Power Supply The RPS port can be used to connect an optional external load-sharing RPS to the
Switch. When the internal power fails, the external RPS will immediately supply
power to the Switch automatically.
Rear Panel LED Indicators
The rear panel LED indicators provide valuable information in a variety of ways like their color, blinking times, and
location.
Figure 2-13 DGS-1520-28/52 Rear Panel LED Indicators
The rear panel LED indicators (per device) are described in the following table:
LED Color Status Description
Link/Act Green On (Solid) Active connection at 1 Gbps through the MGMT port
On (Blinking) Data transmitted and received through the MGMT port
Amber On (Solid) Active connection at 10/100 Mbps through the MGMT
port
On (Blinking) Data transmitted and received through the MGMT port
Off Off Inactive connection or no link present
PD Green On (Solid) Receiving DC power from PoH PSE connected to the
MGMT port
Amber On (Solid) Normal MGMT connection active (no PoH supplied).
When a PSE is connected, this light indicates that a
power supply failure has occurred.
Off Off No PoH PSE or MGMT connection is present

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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Side Panel Components
The side panels feature components like heat vents, fans, and rack-mounting screw holes. These components are
described in detail below. The heat vents are used to dissipate internal heat and facilitate internal air circulation.
Figure 2-14 DGS-1520-28 Side Panels
Figure 2-15 DGS-1520-28MP Side Panels
Figure 2-16 DGS-1520-52 Side Panels
Figure 2-17 DGS-1520-52MP Side Panels

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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Smart Fans
The DGS-1520 Series Switches includes smart fans that will automatically change their speed depending on the
internal temperature detected by the sensors built-in the Switch’s hardware.
The following table lists at what temperature the speed of the fan(s) will change:
Module Low Speed Medium Speed High Speed
DGS-1520-28 Below 30°C Above 33°C / Below 37°C Above 40°C
DGS-1520-28MP Below 30°C Above 33°C / Below 37°C Above 40°C
DGS-1520-52 Below 30°C Above 33°C / Below 37°C Above 40°C
DGS-1520-52MP Below 30°C Above 33°C / Below 37°C Above 40°C

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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3. Installation
Installation Guidelines
Installing the Switch without a Rack
Installing the Switch in a Standard 19" Rack
Installing Transceivers into the Transceiver Ports
Connecting AC Power to the Switch
Connecting PoH to the Switch
Installing the Redundant Power Supply (RPS)
Installation Guidelines
This section will discuss the hardware installation guidelines that the user must follow in order to properly and safely
install this switch into the appropriate environment.
•Visually inspect the power cord and see that it is fully secured to both the power connector, on the Switch, and
the electrical outlet that supplies power.
•Install the Switch in a fairly cool and dry place within the acceptable operating temperature and humidity
ranges. For more information about the acceptable operating temperature and humidity ranges, refer to the
Physical and Environmental section.
•Install the Switch in a site free from strong electromagnetic field generators such as motors, vibration, dust, and
direct exposure to sunlight.
Installing the Switch without a Rack
This section is used to guide the user through installing the Switch in an area other than a switch rack. Attach the
included rubber feet to the bottom of the Switch. Take note that there should be marked blocks on the bottom of the
Switch to indicate where to attach the rubber feet. These markings are usually found in each corner on the bottom of
the device. The rubber feet cushion the Switch, protecting the casing from scratches and preventing it from scratching
other surfaces.
Figure 3-1 Attaching rubber feet to the Switch
Install the Switch on a sturdy, level surface that can support the weight of the Switch. Do not place any heavy objects
on the Switch. The power outlet should be within 1.82 meters (6 feet) of the Switch. 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, sides, and rear of the Switch for ventilation.

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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Installing the Switch in a Standard 19" Rack
This section is used to guide the user through installing the Switch into a switch rack. The Switch can be mounted in a
standard 19"(1U) rack using the rack mounting kit included in the package contents.
Fasten the mounting brackets to the sides of the Switch using the screws provided.
Figure 3-2 Attaching rack-mount brackets to the Switch
Fasten the mounting brackets in any available open space in the rack using the screws provided.
Figure 3-3 Installing the Switch in a Rack
Make sure that there is adequate space around the Switch to allow for proper airflow, ventilation, and cooling.

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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Installing Transceivers into the Transceiver Ports
The Switch is equipped with SFP+ ports that can be used to connect various networking devices to this switch that do
not support the standard RJ45 wiring connection. These ports are generally used to connect this switch to optical fiber
connections and can be used to connect devices to the Switch over great distances. The maximum distance that the
RJ45 wiring connection can reach is 100 meters. Fiber optic connections can span several kilometers.
The figure below illustrates how to insert SFP/SFP+ transceivers into the SFP+ ports.
Figure 3-4 Inserting transceivers into the transceiver ports
NOTE: For the full list of D-Link SFP/SFP+ transceivers that are supported on the Switch, refer to the
Supported SFP/SFP+ Transceivers table on page 33.
NOTE: Only use pluggable optical modules and Direct-Attach Cables (DAC) that meet the following
regulatory requirements:
•Class 1 Laser Product
•UL and/or CSA registered component for North America
•FCC 21 CFR Chapter 1, Sub-chapter J in accordance with FDA & CDRH requirements
•IEC/EN 60825-1/-2: 2007 2nd edition or later, European Standard

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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Connecting AC Power to the Switch
To connect AC power to the Switch, plug one end of the AC power cord into the AC power socket of the Switch and
the other end of the AC power cord into the local AC power source outlet. There is no power switch/button on the
Switch. The system will power on automatically.
After the system is powered on, the Power LED will blink green to indicate that the system is booting up. In the event
of a power failure, just as a precaution, unplug the power cord from the Switch. After the power returned, plug the
power cord back into the power socket of the Switch.
Installing the AC Power Cord Retainer
To prevent accidental removal of the AC power cord, it is recommended to install the AC Power Cord Retainer Set
together with the AC power cord. The AC Power Cord Retainer Set is included in the package contents.
With the rough side facing down, insert the tie wrap into the hole below the power socket.
Figure 3-5 Insert Tie Wrap into the Switch
Plug the AC power cord into the power socket of the Switch.
Figure 3-6 Connect the power cord to the Switch

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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Slide the retainer through the tie wrap until the end of the cord.
Figure 3-7 Slide the Retainer through the Tie Wrap
Circle the tie of the retainer around the power cord and into the locker of the retainer.
Figure 3-8 Circle around the power cord