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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

  • Management typeManaged
  • Main ports44 Gigabit + 4 Combo GE/SFP Port
  • Main port speed10/100/1000 Mbit/s
  • Buffer size2 MB
  • Layer support2
  • Power details100 to 240 VAC, 50 to 60 Hz Internal Universal Power Supply
  • 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.

How it compares

Measured against everything we stock in Ethernet & PoE Switches, at today’s prices. Recalculated every night.

Price $1,126.99
Pricier than about 67% of the 2,759 comparable items (median $482.99).

Specifications

Product
Brand nameD-Link
Model nameDGS-3120-48TC/SI
Memory
Buffer size2 MB
Connectivity
Management typeManaged
Main port speed10/100/1000 Mbit/s
VLAN capabilityYes
Stacking supportYes
SNMP supportYes
Layer support2
Ports & slots
Main ports44 Gigabit + 4 Combo GE/SFP Port
Power
Power details100 to 240 VAC, 50 to 60 Hz Internal Universal Power Supply
Size & build
Product dimensions17.3 in × 12.2 in × 1.73 in
Product weight10.17 lb (4.61 kg)
Shipping weight8.17 kg
Package size591 × 451 × 95 mm
Environment & compliance
Temperature range0 °C to 50 °C (32 °F to 122 °F)
Humidity range10% - 90%, Non-condensing

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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