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Silver rack-mount network switch with 48 ports and management display

D-Link

D-Link DGS-3120-48PC/SI 48-port PoE managed network switch

SKU CH-BWW7-12H5B MPN DGS-3120-48PC/SI

A managed stackable Gigabit switch with 44 RJ45 and 4 SFP ports, PoE support, 136 Gbps switching capacity and 2 MB buffer memory

  • Management typeManaged
  • Main ports44 x RJ45 + 4 x SFP
  • 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-port Gigabit connectivity for high-density wired networks
  • 44 RJ45 and 4 SFP ports provide flexible copper and fibre uplinks
  • PoE support powers access points, cameras and phones over the data cable
  • 136 Gbps switching capacity handles heavy traffic loads
  • Stackable design with two dedicated ports simplifies multi-switch management

48-port PoE managed switch

The D-Link DGS-3120-48PC/SI is a stackable Layer 2 switch with 44 RJ45 ports and 4 SFP uplinks. It delivers Power over Ethernet across all copper ports for devices such as access points and IP cameras. The Standard Image firmware provides QoS, traffic shaping and L2 multicasting for business networks. Physical and virtual stacking allows multiple units to be managed as one logical device.

Gigabit throughput and buffer limits

Each RJ45 port operates at 10/100/1000Mbps with a total switching capacity of 136 Gbps. The 64-byte packet forwarding rate is 101.19 Mbps and the buffer memory is 2MB. These figures define the practical ceiling for sustained wire-speed traffic across all 48 ports simultaneously. The internal universal power supply accepts 100 to 240 VAC at 50 to 60 Hz without external adapters.

Upgrade from unmanaged or non-PoE switches

This unit replaces unmanaged Gigabit switches that lack PoE, VLANs or SNMP monitoring. The jump is worthwhile when you need to power 48 endpoints from the rack, segment traffic with VLANs, or manage the stack through a single IP address. It is not for buyers who require Layer 3 routing, IPv6 features such as ERPS or Q-in-Q, or Enhanced Image firmware capabilities.

How it compares

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

Price $1,566.99
Pricier than about 73% of the 2,759 comparable items (median $482.99).

Specifications

Product
Brand nameD-Link
Model nameDGS-3120-48PC/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 x RJ45 + 4 x SFP
Power
Power over EthernetYes
Power details100 to 240 VAC, 50 to 60 Hz Internal Universal Power Supply
Size & build
Product dimensions17.3 in × 14.96 in × 1.73 in
Product weight13.96 lb (6.33 kg)
Shipping weight9.07 kg
Package size254 × 203 × 152 mm

Questions about this item

Should I pick the Standard Image version or the Enhanced Image version for my network?

The Standard Image version supplies advanced QoS, traffic shaping, L2 multicasting and robust security features suitable for most business deployments.

What does the 136 Gbps switching capacity mean when the switch is fully loaded?

It represents the maximum aggregate throughput the fabric can handle across all 48 ports simultaneously.

How many devices can the four SFP ports actually connect at Gigabit speed?

Each SFP port accepts a 1 Gbps transceiver, so up to four fibre or copper uplinks can run at full line rate.

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