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Silver 1U rack-mount switch with 48 RJ-45 ports and four SFP slots

D-Link

D-Link DGS-3120-48TC/SI 48-port managed stackable network switch

SKU CH-Y3SY-3B43A MPN DGS-3120-48TC/SI

A managed, stackable Gigabit switch with 48 ports and 136 Gbps switching capacity for commercial networks

  • Network Management TypeManaged
  • Primary Ports44 Gigabit + 4 Combo GE/SFP Port
  • Primary Port Speed10/100/1000Mbps
  • VLAN SupportYes
  • Buffer Memory2MB
  • StackableYes
  • 48 Gigabit ports plus four SFP combo slots for flexible uplinks
  • 136 Gbps switching capacity handles heavy traffic without congestion
  • 19 Mpps forwarding rate keeps latency low at line speed
  • Physical and virtual stacking simplifies multi-switch management
  • 2 MB packet buffer absorbs bursts to prevent frame loss

48-port Gigabit managed stackable switch

The D-Link DGS-3120-48TC/SI is a Layer 2 managed switch with 48 Gigabit Ethernet ports. It provides 44 fixed RJ-45 ports plus four combo GE/SFP slots for fibre uplinks. The unit supports physical stacking and virtual stacking for simplified management. It is built for small to medium business networks needing centralised control.

Installation uses standard 19-inch rack mounting

The switch fits a 1U rack space with an internal universal power supply accepting 100 to 240 VAC. An RJ-45 console port and an SD card slot are provided for configuration and firmware storage. Ensure adequate airflow within the 0°C to 50°C operating range. The combo ports require compatible SFP transceivers which are sold separately.

Suits businesses needing managed Gigabit stacking

This model fits organisations that require VLAN, QoS and SNMP on a 48-port Gigabit backbone with stacking capability. It is not for buyers who need Layer 3 routing features or 10 Gigabit uplink speeds. Networks requiring Power over Ethernet or a larger switching capacity should look at other product lines.

Highlights

  • 48 Gigabit ports plus four SFP combo slots for flexible uplinks
  • 136 Gbps switching capacity handles heavy traffic without congestion
  • 19 Mpps forwarding rate keeps latency low at line speed
  • Physical and virtual stacking simplifies multi-switch management
  • 2 MB packet buffer absorbs bursts to prevent frame loss

Specifications

BrandD-Link
ModelDGS-3120-48TC/SI
Network Management TypeManaged
Primary Ports44 Gigabit + 4 Combo GE/SFP Port
Primary Port Speed10/100/1000Mbps
VLAN SupportYes
Buffer Memory2MB
StackableYes
SNMPYes
QoSYes
Layer2
Power100 to 240 VAC, 50 to 60 Hz Internal Universal Power Supply
Dimensions17.3" x 12.2" x 1.73"
Weight10.17 lbs.
Temperature0°C to 50°C (32°F to 122°F)
Humidity10% - 90%, Non-condensing
FeaturesStack Port: YesTotal Number of Network Ports: 48Number of Network (RJ-45) Ports: 48Port/Expansion Slot Details: 48 x Gigabit Ethernet Network,4 x Gigabit Ethernet Expansion SlotEthernet Technology: Gigabit Ethernet,Fast EthernetNetwork Technology: 10/100/1000Base-TNumber of Total Expansion Slots: 5Expansion Slot Type: SFPLayer Supported: 2Manageable: YesInput Voltage: 110 V AC,220 V ACHeight: 1.7" (44 mm)Width: 17.3" (440 mm)Depth: 12.2" (310 mm)Green Compliant: YesGreen Compliance Certificate/Authority: RoHSLimited Warranty: Lifetime
Package ContentsSwitching Capacity: 136 Gbps
64-Byte Packet Forwarding Rate: 101.19 Mbps
Flash Memory: 32 MB
Console Port: RJ-45
Stacking Port: 2
SD Card Slot: 1
Standard Image (SI) Features:
Stackability: Physical Stacking, Virtual Stacking
L2 Features:
Flow Control
Spanning Tree Protocols
Loopback Detection
802.3ad Link Aggregation
L2 Multicasting:
IGMP Snooping
Limited IP Multicast
MLD Snooping
VLAN:
VLAN Group -Max. 4K VLAN Groups
GVRP -Max. 255 Dynamic VLAN Groups
802.1Q Tagged VLAN
Port-based VLAN
802.1v Protocol VLAN
Voice VLAN
MAC-based VLAN
ISM VLAN
Asymmetric VLAN
Private VLAN
VLAN Trunkin
Shipping weight8.17 kg
Package size591 × 451 × 95 mm

Questions about this item

How do I verify the 136 Gbps switching capacity is active after connecting the 48 RJ-45 ports?

The front-panel LEDs show link speed and activity for every port; the web or CLI status page reports the aggregate throughput and stack health in real time.

Does the package include SFP transceivers for the four combo ports or must I buy them separately?

The box contains the switch, an internal 100-240 VAC power supply, a console cable, rack-mount brackets and a quick-start guide; SFP modules are not included.

What is the difference between the Standard Image and a Lite Image for this 48-port stackable switch?

The Standard Image enables full Layer 2 management, physical and virtual stacking, SNMP, QoS, VLANs and the SD card slot for configuration backup.

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