48-Port Managed Gigabit Stackable L2+ PoE Switch including 4 Combo SFP ports



The DGS-3120 xStack Series are enhanced L2 stackable access switches designed to connect end-users in a secure SMB or enterprise network. These switches support physical stacking, multicast and enhanced security, making them an ideal Gigabit access layer solution. The DGS-3120-24TC and DGS-3120-48TC provide 20 or 44 10/100/1000 Mbps Gigabit Ethernet ports and 4 combo 1000BASE-T/SFP Gigabit Ethernet ports. The DGS-3120-24PC and DGS-3120-48PC provide 20 or 44 10/100/1000 Mbps PoE Gigabit Ethernet ports and 4 combo 1000BASE-T/SFP Gigabit Ethernet ports. Each 10/100/1000 Mbps port of DGS-3120-24PC/48PC supports IEEE 802.3af and IEEE 802.3at Power over Ethernet standard. The default power budget is 370 Watts and can be expanded to 740 Watts with the DPS-700 RPS. The switches are also equipped with an SD Card slot, allowing the user to boot images and upload configuration files directly from an SD Card. Furthermore, syslog files can also be conveniently saved to a card.

Standard and Enhanced Software Images
The DGS-3120 Series supports two different software images – Standard Image (SI) and Enhanced Image (EI). The Standard Image provides sophisticated features for campus, or enterprise. It includes advanced Quality of Service (QoS), traffic shaping, L2 multicasting, and robust security features. The Enhanced Image supports ERPS, Double VLAN (Q-in-Q), Ethernet OAM, Static Route, IMPB, sFlow, IPv6 features which are suitable for the next generation IPv6 networks or triple play applications in Metro Ethernet.

All DGS-3120 models are shipped with the Standard Image. A separately orderable license key may also be ordered which activates the Enhanced Image.

Enhanced Network Reliability
The DGS-3120 Series targets enterprise/campus and customers who require a high level of network security and maximum uptime. All the models in DGS-3120 Series support an external redundant power supply so that continued operation can be assured. They also include other features, such as 802.1D Spanning Tree (STP), 802.1w Rapid Spanning Tree (RSTP) and 802.1s Multiple Spanning Tree (MSTP), Loopback Detection (LBD), and Broadcast Storm Control, that enhance network resilience. The G.8032 Ethernet Ring Protection Switching (ERPS) function minimizes the recovery time to 50 ms2. For load sharing and redundancy backup in switch cascading/server attachment configuration, the DGS-3120 Series provides dynamic 802.3ad Link Aggregation Port Trunking.

Comprehensive Security
The DGS-3120 Series provides users with the latest security features such as Multi-layer and Packet Content Access Control Lists (ACL), Storm Control, and IP-MAC-Port Binding (IMPB) with DHCP Snooping. The IP-MAC-Port Binding feature allows administrators to bind a source IP address with an associated MAC and also define the port number to enhance user access control. With the DHCP Snooping feature, the switch automatically learns IP/MAC pairs by snooping DHCP packets and saving them to the IMPB white list. In addition, the D-Link Safeguard Engine identifies and prioritizes “CPU interested” packets to prevent malicious traffic from interrupting normal network flows, and to protect switch operation.

Identity Driven Network Policies
The DGS-3120 Series supports authentication mechanisms such as 802.1X, Web-based Access Control (WAC), and MAC-based Access Control (MAC) for strict access control and easy deployment. After authentication, individual policies such as VLAN membership, QoS policies, and ACL rules can be assigned to each host. In addition, the switch also supports Microsoft® NAP (Network Access Protection). NAP is a policy enforcement technology that allows customers to protect network assets from unhealthy computers by enforcing compliance with network health policies.

Traffic Management for Triple Play
The DGS-3120 Series implements a rich set of multilayer QoS/CoS features to ensure that critical network services like VoIP, video conference, IPTV and IP surveillance are served with high priority. The Traffic Shaping features guarantee bandwidth of these services when the network is busy. With L2 Multicast support, the DGS-3120 shows its ability to handle growing IPTV applications. Host-based IGMP/MLD Snooping allows multiple multicast subscribers per physical interface, ISM VLAN sends multicast streams in a multicast VLAN to save bandwidth and to provide better security to the backbone network. The ISM VLAN profiles allow users to bind/replace the pre-defined multicast registration information to subscriber ports quickly and easily.

Proactive, Effective Network Management
To uphold enterprise customers’ Service Level Agreements (SLA), service providers must reduce the Mean Time to Repair (MTTR) and increase service availability. Ethernet OAM features address these challenges and enable service providers to offer carrier-grade services. The DGS-3120 Series supports industry-standard OAM tools, including IEEE 802.3ah, IEEE 802.1ag, and ITU-T Y.1731. Connectivity Fault Management (CFM) provides tools to monitor and troubleshoot end-to-end Ethernet networks, allowing service providers to check connectivity, isolate network issues, and identify customers affected by network issues.

IPv6 Technology
The DGS-3120 Series is fully compliant with the future IPv6 networks. It supports remote IPv6 manageability from telnet, HTTP, or SNMP. To create secure IPv6 networks, the DGS-3120 Series uses IPv6 ACL, DHCPv6 Snooping and Neighbor Discovery (ND) Snooping functions to protect the network from illegal IPv6 clients. The DGS-3120 Series has been certified with IPv6 Ready Logo Phase 2 from the IPv6 forum, a worldwide IPv6 advocacy consortium. The IPv6 Ready Logo Program provides conformance and interoperability of IPv6 products.

D-Link Green Technology
D-Link is striving to take the lead in developing innovative and powersaving technology that does not sacrifice operational performance or functionality. The DGS-3120 Series implements the D-Link Green Technology, which includes a power saving mode, smart fan, reduced heat dissipation, and cable length detection. The power saving feature automatically powers down ports that have no link or link partner. The Smart Fan feature allows for the built-in fans to automatically adjust their speed at a certain temperature, providing continuous, reliable and eco-friendly operation of the switch.

D-Link’s Single IP Management (SIM) simplifies and speeds up management tasks, allowing multiple switches to be configured, monitored and maintained from any workstation running a web browser through one unique IP address. This virtual stack is managed as a single object, having all units maintained by one IP address. The DGS-3120 Series also supports standard-based management protocols such as SNMP, RMON, Telnet, Console, Web-based GUI and SSH/SSL security authentication.

Lifetime Warranty and NBD Replacement
D-Link offers a Lifetime Warranty and Next Business Day (NBD) hardware replacement on the DGS-3120 Series of xStack L2 Managed Stackable Gigabit Switches to further its commitment to product quality and long-term customer confidence.

Technical Specifications


• 20 x 10/100/1000BASE-T ports (RJ45)
• 4 x Gigabit Combo ports (RJ45/SFP)
• 2 x 10GbE Stacking Ports (CX4)
• Console Port: RJ45
• SD Card Slot
• Optional Redundant Power Supply: DPS-200/DPS-200A

• 44 x 10/100/1000BASE-T ports (RJ45)
• 4 x Gigabit Combo ports (RJ45/SFP)
• 2 x 10GbE Stacking Ports (CX4)
• Console Port: RJ45
• SD Card Slot
• Optional Redundant Power Supply: DPS-500A

• 20 x 10/100/1000BASE-T ports (RJ45)
• 4 x Gigabit Combo ports (RJ45/SFP)
• 2 x 10GbE Stacking Ports (CX4)
• Console Port: RJ45
• SD Card Slot
• Optional Redundant Power Supply: DPS-700

• 44 x 10/100/1000BASE-T ports (RJ45)
• 4 x Gigabit Combo ports (RJ45/SFP)
• 2 x 10GbE Stacking Ports (CX4)
• Console Port: RJ45
• SD Card Slot
• Optional Redundant Power Supply: DPS-700


Switch Capacity
• DGS-3120-24TC: 88 Gbps
• DGS-3120-48TC: 136 Gbps
• DGS-3120-24PC: 88 Gbps
• DGS-3120-48PC: 136 Gbps

64-Byte Packet Forwarding Rate
• DGS-3120-24TC:65.48 Mbps
• DGS-3120-48TC:101.19 Mbps
• DGS-3120-24PC: 65.48 Mbps
• DGS-3120-48PC: 101.19 Mbps

Packet Buffer Memory
• 2 MB (all models)

Flash Memory
• 32 MB (all models)

Power over Ethernet (DGS-3120-24PC and DGS-3120-48PC only)

PoE Standards
• DGS-3120-24PC:802.3af / 802.3at
• DGS-3120-48PC:802.3af / 802.3at

PoE Power Budget
• DGS-3120-24PC:370W (740W with DPS-700)
• DGS-3120-48PC:370W (740W with DPS-700)

Physical and Environmental

• DGS-3120-24TC: 344,512 hours
• DGS-3120-48TC: 275,756 hours
• DGS-3120-24PC:  272,292 hours
• DGS-3120-48PC: 213,575 hours

• DGS-3120-24TC:
     • Max: 44.2 dB
     • Min: 28.1 dB
• DGS-3120-48TC:
     • Max: 49.6
     • Min: 37.7 dB
• DGS-3120-24PC:
     • Max: 52.5 dB
     • Min: 38.1 dB
• DGS-3120-48PC:
     • Max: 50.2 dB
     • Min: 37.3 dB

Heat Dissipation
• DGS-3120-24TC:
     • 121.1 BTU/h
• DGS-3120-48TC:
     • 209.7 BTU/h
• DGS-3120-24PC:
     • 1665.10 BTU/h (w/370 W PoE load)
     • 3227.9 BTU/h (w/740 W PoE load)
• DGS-3120-48PC:
     • 1838 BTU/h (w/370 W PoE load)
     • 3283.83 BTU/h (w/740 W PoE load)

Power Input
• 100 to 240 VAC 50 to 60 Hz (all models)

Max. Power Consumption
• DGS-3120-24TC:
     • 35.5 W
• DGS-3120-48TC:
     • 61.5 W
• DGS-3120-24PC:
     • 488.3 watts (w/370 W PoE load)
     • 946.6 watts (w/740 W PoE load)
• DGS-3120-48PC:
     • 539 watts (w/370 W PoE load)
     • 963 watts (w/740 W PoE load)

Dimensions (W x D x H)
• DGS-3120-24TC: 17.3 x 8.3 x 1.73 inches (440 x 210 x 44 mm)
• DGS-3120-48TC: 17.3 x 12.2 x 1.73 inches (440 x 310 x 44 mm)
• DGS-3120-24PC: 17.3 x 12.2 x 1.73 inches (440 x 310 x 44 mm)
• DGS-3120-48PC: 17.3 x 15.0 x 1.73 inches (440 x 380 x 44 mm)

• DGS-3120-24TC: 5.66 lbs / 2.57 kg
• DGS-3120-48TC: 10.0 lbs / 4.54 kg
• DGS-3120-24PC: 11.71 lbs / 5.31 kg
• DGS-3120-48PC: 14.15 lbs / 6.42 kg

• Smart Fan3 (High Speed at > 40 ˚C; Low Speed at < 35 ˚C) (all models)

Operating Temperature
• 32°F to 122°F (0°C to 50°C) (all models)

Storage Temperature
• -40°F to 158°F (-40°C to 70°C) (all models)

Operating Humidity
• 10% to 90% RH (all models)

Storage Humidity
• 5% to 90% RH (all models)

Certifications (all models)


• FCC Class A, CE Class A, VCCI Class A, IC, C-Tick, BSMI

• IPv6 Ready Logo Phase 2

Software Features - All Models

Standard Image (SI) Software includes the following features: (ships with product)

• Physical stacking
     • Up to 40G stacking bandwidth
     • Up to 6 units per stack
• Virtual Stacking
     • Supports D-Link Single IP Management (SIM)
     • Up to 32 units per Virtual Stack

L2 Features
• MAC Address Table : 16K entries
• Flow Control
     • 802.3x Flow Control
     • HOL Blocking Prevention
• Jumbo Frames up to 13 Kbytes
• 802.3ad Link Aggregation
     • Max. 32 groups per device, 8 Gigabit ports per group
• Spanning Tree Protocols
     • 802.1D STP
     • 802.1w RSTP
     • 802.1s MSTP
     • BPDU Filtering
     • Root Restriction
• Loopback Detection
• Port Mirroring
     • One-to-One
     • Many-to-One
     • Flow-based
     • RSPAN Mirroring

L2 Multicasting
• IGMP Snooping
     • IGMP v1/v2/v3 Snooping
     • Supports 1024 IGMP groups
     • Port/Host-based IGMP Snooping Fast Leave
• Limited IP Multicast
     • Up to 24 IGMP filtering profiles, 32 ranges per profile
• MLD Snooping
     • MLD v1/v2 Snooping
• Support 1024 MLD Groups
• Host-based MLD Snooping Fast Leave

• VLAN Group
     • Max. 4K VLAN Groups
     • Max. 4K Dynamic VLAN Groups
• 802.1Q Tagged VLAN
• Port-based VLAN
• 802.1v Protocol VLAN
• Voice VLAN
• MAC-based VLAN
• Asymmetric VLAN
• Private VLAN
• VLAN Trunking

QoS (Quality of Service)
• 802.1p
• 8 queues per port
• Queue Handling
     • Strict Priority
     • Weighted Round Robin (WRR)
     • Strict + WRR
• Supports following actions for flows
     • Remark 802.1p Priority Tag
     • Remark TOS/DSCP Tag
     • Bandwidth Control
• CoS based on
     • Switch Port
     • VLAN ID
     • 802.1p Priority Queues
     • MAC Address
     • IPv4 Address
     • DSCP
     • Protocol Type
     • TCP/UDP Port
     • User-Defined Packet Content
     • IPv6 Address
     • IPv6 Traffic Class
     • IPv6 Flow Label
• Bandwidth Control
     • Port-based (Ingress/Egress, Min. Granularity 8 Kbps)
     • Flow-based (Ingress/Egress, Min. Granularity 8 Kbps)
• Three Color Marker
     • CIR/PIR minimum granularity: 8 kbps
     • Two Rate Three Color Marker (trTCM), CBS/PBS
     • Single Rate Three Color Marker (srTCM), CBS/EBS

Access Control List (ACL)
• ACL based on
     • 802.1p Priority
     • VLAN ID
     • MAC Address
     • Ether Type
     • IPv4 Address
     • DSCP
     • Protocol Type
     • TCP/UDP Port Number
     • User-Defined Packet Content
     • IPv6 Address
     • IPv6 Flow Label
     • IPv6 Traffic Class
• Supports up to 1.5K Ingress access rules
• Time-based ACL
• CPU Interface Filtering

• SSH v2
• SSL v1/v2/v3
• Port Security
     • Up to 64 MAC addresses per port/VLAN
• Broadcast/Multicast/Unicast Storm Control
• Traffic Segmentation
• D-Link Safeguard Engine
• NetBIOS/NetBEUI Filtering
• DHCP Server Screening
• ARP Spoofing Prevention
• DoS Attack Prevention
• BPDU Attack Protection

• 802.1X:
     • Port-based Access Control
     • Host-based Access Control
     • Identity-driven Policy (VLAN, ACL or QoS) Assignment
     • Authentication Database Failover
• Web-based Access Control (WAC):
     • Port-based Access Control
     • Host-based Access Control
     • Identity-driven Policy (VLAN, ACL or QoS) Assignment
     • Authentication Database Failover
MAC-based Access Control (MAC):
     • Port-based Access Control
     • Host-based Access Control
     • Identity-driven Policy (VLAN, ACL or QoS) Assignment
     • Authentication Database Failover
• Japan Web-based Access Control (Host-based JWAC)
• Guest VLAN
• Microsoft® NAP
     • Support 802.1X NAP
     • Support DHCP NAP
• RADIUS Accounting
• TACACS+ Accounting
• RADIUS and TACACS authentication for switch access
• Four levels of User Account control

Green Features
• Compliant with RoHS
• Power Saving by Link Status
• Power Saving by Cable Length
• Time-based PoE1
• IEEE 802.3az Energy Efficient Ethernet (EEE)

Operation, Administration & Management (OAM)
• Cable Diagnostics

• Web-based GUI
• Command Line Interface (CLI)
• Telnet Server
• Telnet Client
• TFTP Client
• DNS Client
• Secure FTP Server
• ZModem
• SNMP v1/v2c/v3
• SNMP Traps
• System Log
• RMON v1:
     • Supports 1,2,3,9 groups
• RMON v2:
     • Supports ProbeConfig group
• BootP/DHCP Client
• DHCP Auto-Configuration
• DHCP Relay
• DHCP Client Option 12
• DHCP Relay Option 18, 37, 82
• Flash File System
• Multiple Images
• Multiple Configurations
• CPU Monitoring
• Debug Command
• Password Recovery
• Password Encryption
• Trusted Host
• Microsoft® NLB (Network Load Balancing) Support
• ICMPv6

Enhanced Image (EI) Software includes all SI features plus the following: (requires additional license upgrade)

L2 Features
• Ethernet Ring Protection Switching (ERPS)

• Double VLAN (Q-in-Q)
     • Port-based Q-in-Q

L3 Features
• Max. 16 IP Interfaces
• ARP Proxy
• IPv6 Neighbor Discovery (ND)

L3 Routing
• Static Route
     • 512 static routing entries for IPv4/IPv6

Access Control List (ACL)
• Supports up to 512 egress access rules

• IP-MAC-Port Binding
     • ARP Packet Inspection
     • IP Packet Inspection
     • DHCP Snooping
     • IPv6 ND Snooping
     • Support up to 510 Address Binding Entries per Device

• Compound Authentication

Operation, Administration & Management (OAM)
• 802.3ah Ethernet Link OAM
• 802.3ah D-Link Extension: D-link Unidirectional Link Detection (DULD)
• 802.1ag Connectivity Fault Management (CFM)
• ITU-T Y.1731

• sFlow
• PPPoE Circuit-ID Tag Insertion


• RFC 1213 MIB II
• RFC 4188 Bridge MIB
• RFC 1157, 2571-2576 SNMP MIB
• RFC 1907 SNMPv2 MIB
• RFC 1757, 2819 RMON MIB
• RFC 2021 RMONv2 MIB
• RFC 1398, 1643, 1650, 2358, 2665 Ether-like MIB
• RFC 2674 802.1p MIB
• RFC 2233, 2863 IF MIB
• RFC 2618 RADIUS Authentication Client MIB
• RFC 2620 RADIUS Accounting Client MIB
• RFC 2674, 4363 802.1p MIB
• RFC 1065, 1066, 1155, 1156, 2578 MIB Structure
• RFC 1215 MIB Traps Convention
• RFC 1212 Concise MIB Definitions
• RFC 1215 MIB Traps Convention
• RFC 1157, 2571-2576 SNMP MIB
• RFC 4022 MIB for TCP
• RFC 4113 MIB for UDP
• RFC 4293 IPv6 SNMP Mgmt Interface MIB
• RFC 2737 Entity MIB (version 2)

RFC Standard Compliance
• RFC 768 UDP
• RFC 791 IP
• RFC 792, 2463, 4443 ICMP
• RFC 793 TCP
• RFC 826 ARP
• RFC 3513, 4291, IPv6 Addressing Architecture
• RFC 2893, 4213 IPv4/IPv6 dual stack function
• RFC 2463, 4443 ICMPv6
• RFC 2462, 4862 IPv6 Stateless Address Auto Configuration
• RFC 2464 IPv6 Ethernet and definition
• RFC 1981 Path MTU Discovery for IPv6
• RFC 2460 IPv6
• RFC 2461, 4861 Neighbor Discovery for IPv6
• RFC 783 TFTP
• RFC 2068 HTTP
• RFC 2866 RADIUS Accounting
• RFC 2474, 3260 DiffServ
• RFC 1321, 2284, 2865, 3580, 3748 Extensible Authentication Protocol (EAP)
• RFC 2571, 2572, 2573, 2574, SNMP
• IPv6 Ready Logo Phase 2
• RFC 854 Telnet
• RFC 951, 1542 BootP

Ordering Information4
• DGS-3120-24TC/SI
     • xStack Managed 20-Port Gigabit Stackable L2 Switch, with 4 Combo RJ45/SFP, 40-Gigabit Stacking with 2 10G-CX4 ports, embedded Standard Image
     • Lifetime Warranty
• DGS-3120-48TC/SI
     • xStack Managed 44-Port Gigabit Stackable L2 Switch, with 4 Combo RJ45/SFP, 40-Gigabit Stacking with 2 10G-CX4 ports, embedded Standard Image
     • Lifetime Warranty
• DGS-3120-24PC/SI
     • xStack Managed 20-Port Gigabit Stackable L2 PoE+ Switch, with 4 Combo RJ45/SFP, 40-Gigabit Stacking with 2 10G-CX4 ports, embedded Standard Image
     • Lifetime Warranty
• DGS-3120-48PC/SI
     • xStack Managed 44-Port Gigabit Stackable L2 PoE+ Switch, with 4 Combo RJ45/SFP, 40-Gigabit Stacking with 2 10G-CX4 ports, embedded Standard Image
     • Lifetime Warranty

Optional License Upgrades
• DGS-3120-24TC-SE-LIC DGS-3120-24TC DLMS License Upgrade from Standard Image (SI) to Enhanced Image (EI)
• DGS-3120-48TC-SE-LIC DGS-3120-48TC DLMS License Upgrade from Standard Image (SI) to Enhanced Image (EI)
• DGS-3120-24PC-SE-LIC DGS-3120-24PC DLMS License Upgrade from Standard Image (SI) to Enhanced Image (EI)
• DGS-3120-48PC-SE-LIC DGS-3120-48PC DLMS License Upgrade from Standard Image (SI) to Enhanced Image (EI)

Optional SFP Optical Transceivers
• DGS-712 1000BASE-T SFP Transceiver
• DEM-310GT 1000BASE-LX SFP Transceiver, 10KM
• DEM-311GT 1000BASE-SX SFP Transceiver, up to 550M
• DEM-211 100BASE-FX SFP Transceiver, 2KM

Optional Stacking Cables
• DEM-CB50 50cm Stacking Cable with screw type connector
• DEM-CB100 1m Stacking Cable with screw type connector
• DEM-CB300 3m Stacking Cable with screw type connector

Optional Redundant Power Supplies
• DPS-200 / DPS-200A Redundant Power Supply Unit, 60 Watt RPSU
• DPS-500A Redundant Power Supply Unit, 140 Watt RPSU
• DPS-700 Redundant Power Supply Unit, 589 Watt RPSU
• DPS-800 2-Slot RPS Chassis (use for DPS-200 / DPS-200A / DPS-500A)
• DPS-900 8-Slot RPS Chassis (use for DPS-200)

Optional Management Software
• DV-700 D-View 7 Network Management System
• DV-700-N25-LIC D-View 7 NMS - 25 Node License Upgrade
• DV-700-N50-LIC D-View 7 NMS - 50 Node License Upgrade
• DV-700-N100-LIC D-View 7 NMS - 100 Node License Upgrade
• DV-700-N250-LIC D-View 7 NMS - 250 Node License Upgrade
• DV-700-N500-LIC D-View 7 NMS - 500 Node License Upgrade
• DV-700-N1000-LIC D-View 7 NMS - 1000 Node License Upgrade
• DV-700-P5-LIC D-View 7 NMS - 5 Probe License Upgrade
• DV-700-P25-LIC D-View 7 NMS - 25 Probe License Upgrade

1 This feature supported with PoE models only: DGS-3120-24PC and DGS-3120-48PC.
2 50ms response time based on an ITU-T G.8032 recommended environment.
3 By default, the fan speed is low. When over 40˚C, the fan switches to high speed and remains high until the temperature drops below 35˚C.
4 Stacking cable, SD card, RPS, and optical transceivers are not included and must be separately purchased.
5 Lifetime Warranty available in USA only.



DGS-3120 Series Datasheet

Business Switching Comparison Guide

Tolly Report 215105

• 44 x 10/100/1000BASE-T ports (RJ45)
• 4 x Gigabit Combo ports (RJ45/SFP)
• 2 x 10GbE Stacking ports (CX4)
• Power over Ethernet 802.3af / 802.3at

How to get the

Contact Details

D-Link US
17595 Mt Herrmann St
Fountain Valley
CA 92708

General Inquiries:


Technical Support: