D-Link DMS-1250 Series Manual

Multi-G Ethernet Smart Managed Switch
DMS-1250 Series
Hardware Installation Guide
Version 1.02 | 12/25/2023

DMS-1250 Series Multi-G 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.
© 2023 D-Link Corporation. All rights reserved.
April 2023
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.
CE Mark Warning
This equipment is compliant with Class A of CISPR 32. In a residential environment, this equipment may cause radio interference.
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 Notic
警告：為避免電磁干擾，本產品不應安裝或使用於住宅環境。
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 (Tramsmission) à fibres optiques et les embouts de câbles à fibres optiques tant qu’ils sont sous tension.
Ensure to connect the power cord to a socket-outlet with earthing connection.
Veillez à brancher le cordon d'alimentation sur une prise de courant avec mise à la terre.

DMS-1250 Series Multi-G Ethernet Smart Managed Switch Hardware Installation Guide
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Table of Contents
Typographical Conventions ................................................................................................................................... iv
Notes and Cautions ............................................................................................................................................... iv
Switch Description .................................................................................................................................................. 1
Package Contents .................................................................................................................................................. 1
Features.................................................................................................................................................................. 1
Front Panel Components........................................................................................................................................ 2
Ports .................................................................................................................................................................. 3
Reset Button...................................................................................................................................................... 3
LED Indicators ................................................................................................................................................... 4
Port Functions......................................................................................................................................................... 5
Rear Panel Components ........................................................................................................................................ 7
Side Panel Components ......................................................................................................................................... 8
Smart Fans ........................................................................................................................................................ 9
Installation Guidelines........................................................................................................................................... 10
Installing the Switch without a Rack ..................................................................................................................... 10
Installing the Switch in a Standard 19" Rack........................................................................................................ 11
Installing Transceivers into the Transceiver Ports................................................................................................11
Power On (AC Power) .......................................................................................................................................... 12
Power Failure (AC Power)............................................................................................................................... 12
Installing Power Cord Retainer........................................................................................................................13
Switch to an End Node .........................................................................................................................................16
Switch to Another Switch ...................................................................................................................................... 16
Switch to a Server.................................................................................................................................................17
Management Options ........................................................................................................................................... 18
Connecting to the Console Port............................................................................................................................ 18
Connecting to the Switch for the First Time ....................................................................................................19
Creating a User Account ................................................................................................................................. 20
Configuring the IP Address.............................................................................................................................. 20
Connecting using SNMP....................................................................................................................................... 21
Traps................................................................................................................................................................ 21
Management Information Base (MIB) ............................................................................................................. 22
Introduction ...........................................................................................................................................................23
Logging into the Web UI .......................................................................................................................................23
Web User Interface (Web UI) ...............................................................................................................................25
Areas of the Web UI ........................................................................................................................................ 25
Web Pages ...................................................................................................................................................... 26
Appendix A - Technical Specifications .................................................................................................................27
General ................................................................................................................................................................. 27
Physical and Environmental ................................................................................................................................. 27
Performance ......................................................................................................................................................... 28
Safety Instructions ................................................................................................................................................29
Safety Cautions ............................................................................................................................................... 29
Consignes de sécurité .......................................................................................................................................... 30
Précautions de sécurité ................................................................................................................................... 30
General Precautions for Rack-Mountable Products ............................................................................................. 32
Protecting Against Electrostatic Discharge...........................................................................................................33
Additional Info ....................................................................................................................................................... 34

DMS-1250 Series Multi-G Ethernet Smart Managed Switch Hardware Installation Guide
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Intended Readers
The DMS-1250 Series Multi-G 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. For all practical reasons, all the switches in this series will simply be
referred to as the Switch throughout this manual.
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 Command Line Interface (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.

DMS-1250 Series Multi-G Ethernet Smart Managed Switch Hardware Installation Guide
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1. Introduction
Switch Description
Package Contents
Features
Front Panel Components
Rear Panel Components
Side Panel Components
Switch Description
The DMS-1250 Series is D-Link’s next generation Smart Managed Switch. The Switch has a combination of
2.5GBASE-T and SFP+ ports that may be used to connect various networking devices to the Switch. The SFP+ ports
are used with fiber-optical transceiver cabling in order to uplink various other networking devices for a 1Gbps or 10
Gbps link that may span great distances.
The D-Link DMS-1250 Series includes the following switches:
•DMS-1250-10S: Eight 2.5GE Smart Managed switch with 2 SFP+ ports.
•DMS-1250-10SP: Eight 2.5GE POE Smart Managed switch with 2 SFP+ ports.
•DMS-1250-10SPL:Eight 2.5GE POE Smart Managed switch with 2 SFP+ ports.
•DMS-1250-12TP: Eight 2.5GE POE Smart Managed switch with 2 SFP+ ports and 2 10GE ports.
Package Contents
Open the shipping carton of the Switch and carefully unpack its contents. The box should contain the following items:
•One DMS-1250 Series switch.
•One Safety Notice.
•One AC power cord or power adaptor.
•One rack mounting kit (two brackets and screws).
•Four rubber feet with adhesive backing.
•One power cord retainer set (if with AC inlet power port).
•One RJ45 console cable
•Additional documents based on local regulation requirement (optional).
If any item is missing or damaged, please contact your local D-Link reseller for replacement.
Features
The list of features below highlights the significant features of the Switch.
•Supports a 16K MAC address table.
•Supports Flow Control (802.3x) in full-duplex compliant.
•Supports Jumbo Frames of up to 12KB.
•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 8 groups per Switch.
•Supports Port Mirroring.
•Supports Layer 2 Multicast Filtering.
•Supports IGMP Snooping (v1, v2, v3 awareness) with up to 256 snooping groups and 128 static multicast
addresses. MLD Snooping (v1, v2 awareness) with up to 256 snooping groups and 64 static multicast
addresses. IGMP Snooping and MLD Snooping share 128 static groups and 256 snooping groups.
•Supports Virtual LAN (802.1Q) with up to 4K VLAN groups.
•Supports Port-based VLAN.
•Supports Asymmetric VLAN.

DMS-1250 Series Multi-G Ethernet Smart Managed Switch Hardware Installation Guide
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•Supports Auto Voice and Surveillance VLAN.
•Supports IPv4/IPv6 interfaces.
•Supports Static Routing.
•Supports Quality of Service (QoS) with Queue Handling and Class of Service (CoS).
•Supports Access Control List (ACL).
•Supports Secure Shell (SSHv2) with IPv4/IPv6 access.
•Support Transport Layer Security (TLS) versions 1.3.
•Supports Port Security of up to 64 MAC addresses per port.
•Supports Broadcast and Multicast Storm Control.
•Supports Traffic Segmentation.
•Supports D-Link SafeGuard Engine.
•Supports ARP Spoofing Prevention.
•Supports IP-MAC-Port Binding (IMPB).
•Supports DoS Attack Prevention.
•Supports Guest VLAN.
•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.
•Supports Trivial File Transfer Protocol (TFTP) Client.
•Supports Simple Network Management Protocol (SNMP) version 1, 2c, and 3.
•Supports DHCP Client.
•Support Dual Images and Configurations.
•Supports Simple Network Time Protocol (SNTP).
•Support Power Saving using the Link Status Mode.
•Support Time-based Power-over-Ethernet (PoE).
•Supports IEEE 802.3az compliance.
•Supports D-Link Discovery Protocol (DDP).
•Supports MIBs.
Note: The features are subject to change based on implementation plan without prior notice.
Front Panel Components
The front panel of the Switch features a variety of LED indicators, ports, a Reset button, and a Mode button (only of
PoE supported switches).
Figure 1-1 DMS-1250-10S
Figure 1-2 DMS-1250-10SP

DMS-1250 Series Multi-G Ethernet Smart Managed Switch Hardware Installation Guide
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Figure 1-3. DMS-1250-12TP
Figure 1-4 DMS-1250-10SPL
Ports
Ports that can be found on the front panel of this switch are listed in the table below.
Port Description
ConsoleThe RJ45 console port can be used to connect to the command line interface (CLI)
of the switch for configuration, management and monitoring (for DMS-1250-
10S/DMS-1250-10SP/DMS-1250-12TP).
100/1000/2.5GBASE-T RJ45
Ports
The DMS-1250 series Switches are equipped with 2.5GE RJ45 Ethernet ports.
These ports can operate at 100Mbps, 1Gbps and 2.5Gbps wire-speeds.
100/1000/2.5GBASE-T RJ45
PoE Ports
DMS-1250-10SP, DMS-1250-12TP and DMS-1250-10SPL Switches are equipped
with 8 RJ45 PoE Ethernet ports. These ports can operate at 100 Mbps, 1 Gbps
and 2.5 Gbps wire-speeds and support PoE function.
10 Gigabit SFP+ Ports The Switch is equipped with SFP+ ports. These ports can operate at 1 Gbps and
10 Gbps wire-speeds and support a wide collection of SFP/SFP+ transceivers.
100/1000/2.5G/5G/10GBASE-
T
RJ45 Ports
The DMS-1250-12TP Switch supports 2 RJ45 10 Gbps Ethernet ports. These
ports can operate at 100, 1000, 2500, 5000 and 10000 Mbps wire speeds.
CAUTION: This equipment is to be connected only to PoE networks without routing to the outside plant.
ATTENTION : Cet équipement ne doit être connecté qu'à des réseaux PoE sans routage vers l'extérieur.
For a complete list of SFP/SFP+ transceivers that are compatible with this switch, refer to the SFP+ Ports section in
Port Functions.
Reset Button
On the front panel of the Switch is a Reset button. The Switch will reboot or reset to factory default settings depending
on how long this button is pressed.
•Press and hold the Reset button for less than 5 seconds (release before 5 seconds) to reboot the Switch. All
unsaved configurations will be lost.
•Press and hold the Reset button for more than 5 seconds (release between 6 and 10 seconds or above) to
reset the software configuration of the Switch to the factory default settings. All the port LEDs will light up (solid
amber) for 2 seconds to indicate the start of the factory reset procedure.

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LED Indicators
Located on the front panel of this switch are LED indicators: Power, Console, Fan Error, and Link/Act indicators for all
the ports.
Location LED indicator Color Status Description
Per Device
Power Green Solid Light Device Power On
Light off Device Power Off
Console
DMS-1250-10S
DMS-1250-10SP
DMS-1250-12TP
Green
Solid light RJ-45 Console on
Light off Console off
Fan Error
DMS-1250-10SP
DMS-1250-12TP
Red Solid light The fan has run time failure and is
brought offline
PoE Max.
DMS-1250-10SP
DMS-1250-12TP
DMS-1250-10SPL
Amber
Solid light
Total power output exceeds Guard Band
threshold. The PD will be denied based
on port priority or other PoE rules.
Blinking
When the total power output becomes
sufficient and allows to connect more
PDs (more than 7 Watts), PoE MAX
LED will blink 5 seconds.
Light off The PoE power is sufficient and below
the guard band threshold.
LED Mode
DMS-1250-10SP
DMS-1250-12TP
DMS-1250-10SPL
Green Solid light
A LED Mode push button is allowed to
select the port Link/ACT status or PoE
status.
• Link/Act/Speed Mode
• PoE Mode
LED Per
2.5GBASE-T
Multi-gig Port
Link/Act/Speed
Blue
Solid light
When there is a secure 2.5Gbps
connection at the port.
Blinking When there is reception or transmission
occurring at the port.
Green
Solid light When there is a secure 1000Mbps
connection at the port.
Blinking When there is reception or transmission
occurring at the port.
Amber
Solid light When there is a secure 10/100Mbps
connection at the port.
Blinking When there is reception or transmission
occurring at the port.
Off Light off No link
LED Per
10GBASE-T
Multi-gig Port
Link/Act/Speed
DMS-1250-12TP
Blue
and
Green
Solid light When there is a secure 10Gbps
connection at the port.
Blinking When there is reception or transmission
occurring at the port.
Blue
and
Amber
Solid light When there is a secure 5Gbps
connection at the port.
Blinking When there is reception or transmission
occurring at the port.

DMS-1250 Series Multi-G Ethernet Smart Managed Switch Hardware Installation Guide
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Location LED indicator Color Status Description
Blue
Solid Light When there is a secure 2.5Gbps
connection at the port.
Blinking When there is reception or transmission
occurring at the port.
Green
Solid light When there is a secure 1000Mbps
connection at the port.
Blinking When there is reception or transmission
occurring at the port.
Amber
Solid light When there is a secure 10/100Mbps
connection at the port.
Blinking When there is reception or transmission
occurring at the port.
Off Light off No link
LED Per SFP+
Port Link/Act/Speed
Green
Solid light When there is a secure 10Gbps
connection at the port.
Blinking When there is reception or transmission
occurring at the port.
Amber
Solid light When there is a secure 1000Mbps
connection at the port.
Blinking When there is reception or transmission
occurring at the port.
Off Light off No link
LED Per PoE
Port PoE Status
Green Solid light Power devices insert and the PSE
supplies the port power successfully.
Amber Solid light
Power devices insert but failure occurs.
(PSE can't provide power to PD due to
PD error, over current or power budget
shortage.)
Off Light off PoE Port is not activated, or no PD
connected.
Port Functions
Feature Description
Console Port RJ45 interface for Out-Of-Band (OOB) CLI configuration
RJ45 Ports Compliant with the following standards:
•IEEE 802.3 compliance
•IEEE 802.3u compliance
•IEEE 802.3ab compliance
•IEEE 802.3az compliance
•IEEE 802.3bz compliance
•IEEE 802.3an compliance
Support Half-Duplex and Full-Duplex
•IEEE 802.3x Flow Control support for Full-Duplex mode
•Back Pressure for Half-Duplex mode
•Head-of-line blocking prevention
•Manual/auto MDI/MDIX configuration
•Auto-Negotiation for each port

DMS-1250 Series Multi-G Ethernet Smart Managed Switch Hardware Installation Guide
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Feature Description
SFP/SFP+ Ports Compliant with the following standards:
•IEEE 802.3ae compliance
•IEEE 802.3z compliance
SFP Transceivers Supported:
•DEM-310GT (1000BASE-LX, single-mode, 10 km, with DDM)
•DEM-311GT (1000BASE-SX, multi-mode, 550 m)
•DEM-312GT2 (1000BASE-SX, multi-mode, 2 km)
•DEM-314GT (1000BASE-LHX, single-mode, 50 km)
•DEM-315GT (1000BASE-ZX, single-mode, 80 km)
•DGS-712 (1000BASE-T)
WDM (BiDi) SFP Transceivers Supported:
•DEM-330T (1000BASE-BX-D, single-mode, 10 km, TX: 1550 nm / RX:
1310 nm)
•DEM-330R (1000BASE-BX-U, single-mode, 10 km, TX: 1310 nm / RX:
1550 nm)
•DEM-331T (1000BASE-BX-D, single-mode, 40 km, TX: 1550 nm / RX:
1310 nm)
•DEM-331R (1000BASE-BX-U, single-mode, 40 km, TX: 1310 nm / RX:
1550 nm)
SFP+ Transceivers Supported:
•DEM-431XT (10GBASE-SR,multi-mode, 80 km, without DDM)
•DEM-432XT (10GBASE-LR, single-mode, 10 km, without DDM)
•DEM-433XT (10GBASE-ER, single-mode, 40 km, without DDM)
•DEM-434XT (10GBASE-ZR, single-mode, 80 km, without DDM)
•DEM-435XT (10GBASE-LRM Multi-Mode, 200M SFP+ Transceiver)
•DEM-410T (10GBASE-T Copper SFP+ transceiver, 30M)
WDM (BiDi) SFP+ Transceivers Supported:
•DEM-436XT-BXD (10GBASE-LR, single-mode, 20 km, TX: 1330 nm /
RX: 1270 nm, without DDM)
•DEM-436XT-BXU (10GBASE-LR, single-mode, 20 km, TX: 1270 nm /
RX: 1310 nm, without DDM)
SFP+ Direct Attached Cables (DAC) Supported:
•DEM-CB100S (10G SFP+, 1 m)
•DEM-CB300S (10G SFP+, 3m)
PoE Ports
DMS-1250-10SP
DMS-1250-12TP
DMS-1250-10SPL
Supports the following:
•IEEE802.3af/at PoE+ compliance (for DMS-1250-10SP/DMS-1250-
12TP)
•IEEE802.3af/at/bt PoE++ compliance (for DMS-1250-10SPL)
•The auto-discovery feature automatically recognizes the connection of
the PD device and provides power
•Automatically disable ports if the port current is over 400~450mA while
other ports will remain active
•Active circuit protection automatically disables the port if there is a short
while other ports remain active
•For 802.3af/at/bt capable devices will provide the power for the following
classifications below:
Class Usage Max Power used by PD
0 Default 0.44 Watt to 12.95 Watt
1 Optional 0.44 Watt to 3.84 Watt
2 Optional 3.84 Watt to 6.49 Watt
3 Optional 6.49 Watt to 12.95 Watt
4 Optional (802.3at Only) 12.95 Watt to 25.5 Watt

DMS-1250 Series Multi-G Ethernet Smart Managed Switch Hardware Installation Guide
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Feature Description
5 Type 3 (802.3bt) Max Power used by PD:
51 Watt
•The total PoE power budget of DMS-1250-10SP/12TP : 240 W.
•The total PoE budget of DMS-1250-10SPL: 120 W.
Rear Panel Components
The rear panel of this switch features a security lock, a GND, an AC power connector, and a power cord retainer hole.
Figure 1-5 DMS-1250-10S
Figure 1-6 DMS-1250-10SP
Figure 1-7 DMS-1250-12TP
Figure 1-8 DMS-1250-10SPL
Components that can be found on the rear panel of this switch are listed in the table below.
Component Description
Security Lock Provide a Kensington-compatible security lock to be able to connect 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.
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.
AC or DC power connector Use with AC power cord or external power adapter to supply power to the switch.
Power Cord Retainer The power cord retainer is used to fix the AC power cord in place and not easily
loose. For DMS-1250-10S/DMS-1250-10SP/DMS-1250-12TP)
Note: DMS-1250-10SPL DC power connector is in front panel.

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Side Panel Components
The side panels of this switch contain heat vents, fans, and rack-mounting screw holes. The heat vents are used to
dissipate internal heat and facilitate internal air circulation. Do not block these openings. Leave at least 4 inches of
space at the sides of the Switch for proper ventilation. Without proper heat dissipation and air circulation, system
components might overheat which could lead to system failure or even severely damaged components.
Figure 1-9 DMS-1250-10S
Figure 1-1 DMS-1250-10SP
Figure 1-2 DMS-1250-12TP
Figure 1-3 DMS-1250-10SPL

DMS-1250 Series Multi-G Ethernet Smart Managed Switch Hardware Installation Guide
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Smart Fans
The DMS-1250 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 will explain at what temperature the speed of the fan(s) will change:
•DMS-1250-10S:Fanless
•DMS-1250-10SP/DMS-1250-12TP:5-speed Smart FAN setting as below:
oT1 -- 10°C, FAN Duty 30%
oT2 -- 25°C, FAN Duty 40%
oT3 -- 40°C, FAN Duty 60%
oT4 -- 50°C, FAN Duty 70%
oT5 -- 55°C, FAN Duty 100%
•DMS-1250-10SPL:Fanless
DMS-1250 also can configure the operation state of internal fans through Web UI or command line interface (CLI).
The switch fans can be manually set to Fan Off mode or Quiet mode if the ambient temperature or PoE load do not
exceed the critical level. Please refer to User/CLI manual for more details.

DMS-1250 Series Multi-G Ethernet Smart Managed Switch Hardware Installation Guide
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2. Installation
Installation Guidelines
Installing the Switch without a Rack
Installing the Switch in a Standard 19" Rack
Installing Transceivers into the Transceiver Ports
Power On (AC Power)
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 or power adapter is securely attached to 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 2-1 Attaching rubber feet to the Switch
Install the Switch on a sturdy, level surface that can support the weight of the Switch (see the Weight section in
Appendix A - Technical Specifications.). 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.

DMS-1250 Series Multi-G 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 provided mounting brackets.
Fasten the mounting brackets to the sides of the Switch using the screws provided.
Figure 2-2 Attaching rack-mount brackets to the Switch
Fasten the mounting brackets in any available open space in the rack using the screws provided.
Figure 2-3 Installing the Switch in a Rack
Make sure that there is adequate space around the Switch to allow for proper airflow, ventilation, and cooling.
Installing Transceivers into the Transceiver Ports
The Switch is equipped with Small Form-factor Pluggable (SFP) and Enhanced Small Form-factor Pluggable (SFP+)
ports that can be used to connect various other 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.

DMS-1250 Series Multi-G Ethernet Smart Managed Switch Hardware Installation Guide
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The figure below illustrates how to properly insert SFP/SFP+ transceivers into the Switch’s SFP/SFP+ ports.
Figure 2-4 Inserting transceivers into the transceiver ports
The SFP/SFP+ ports also support other transceiver form factors like SFP and SFP+ transceivers. A complete list of
SFP/SFP+ transceivers, compatible with this switch, can be found in the SFP+/SFP Ports section in Appendix A -
Technical Specifications at the end of this document.
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
REMARQUE : N'utilisez que des modules optiques enfichables et des câbles à connexion directe (DAC)
qui répondent aux exigences réglementaires suivantes :
•Produit laser de classe 1
•Composant enregistré UL et/ou CSA pour l'Amérique du Nord
•FCC 21 CFR Chapitre 1, Sous-chapitre J conformément aux exigences de la FDA et du CDRH
•CEI/EN 60825-1/-2: 2007 2nd édition ou ultérieure, norme européenne
Power On (AC Power)
Plug one end of the AC power cord into the power socket of the Switch and the other end into the local power source
outlet. After the system is powered on, the LED will blink green to indicate that the system is booting up.
Power Failure (AC Power)
In the event of a power failure, just as a precaution, unplug the power cord from the Switch. After the power returns,
plug the power cord back into the power socket of the Switch.

DMS-1250 Series Multi-G Ethernet Smart Managed Switch Hardware Installation Guide
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Installing Power Cord Retainer
To prevent accidental removal of the AC power cord, it is recommended to install the power cord retainer together with
the power cord.
With the rough side facing down, insert the tie wrap into the hole below the power socket.
Figure 2-5 Insert Tie Wrap into the Switch
Plug the AC power cord into the power socket of the Switch.
Figure 2-6 Connect the power cord to the Switch

DMS-1250 Series Multi-G 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 2-7 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 2-8 Circle around the power cord

DMS-1250 Series Multi-G Ethernet Smart Managed Switch Hardware Installation Guide
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Fasten the tie of the retainer until the power cord is secured.
Figure 2-9 Secure the power cord
*All the product pictures shown are for illustration purposes only. Actual product appearance may differ from that
depicted on the packaging/documentation

DMS-1250 Series Multi-G Ethernet Smart Managed Switch Hardware Installation Guide
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3. Switch Connections
Switch to an End Node
Switch to Another Switch
Switch to a Server
Switch to an End Node
An end node is a generic name for edge networking devices that will be connected to this switch. Typical examples of
end nodes are Personal Computers (PCs), Notebooks, Access Points, Print Servers, VoIP Phones and more. Each
end node should be fitted with a RJ45 networking port. Normally, end nodes will connect to this switch by using a
standard twisted-pair UTP/STP network cable. When a successful connection is established, the corresponding port
light will illuminate and blink to indicate that network activity is taking place on that port.
The diagram below displays a typical end node connected to the Switch.
Figure 3-1 Connecting the Switch to an End Node
Switch to Another Switch
The Switch can be used to connect to any other switch or hub in the network. This network topology is used when the
Switch does not have enough ports to cater for all the end nodes in the network.
There is a great deal of flexibility on how connections are made using the appropriate cabling.
•Connect a 10BASE-T switch port to the Switch using a twisted-pair Category 3, 4, or 5 UTP/STP cable.
•Connect a 100BASE-TX switch port to the Switch via a twisted-pair Category 5 UTP/STP cable.
•Connect a 1000BASE-T switch port to the Switch via a twisted pair Category 5e UTP/STP cable.
•Connect a switch supporting an optical fiber uplink to the Switch’s SFP/SFP+ ports via fiber optical cabling.
•Connect a 10GBASE-T switch port to the Switch via twisted pair Category 6a UTP/STP cable1.
110GBASE-T ports may be limited to support 10/100Mbps half mode connection.
Figure 3-2 Connecting the Switch to another switch
RJ-45 Connector
1 3 5 7
2 4 6 8
Switch
Ethern et ca b le