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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

  • Network Management TypeManaged
  • Primary Ports44 x RJ45 + 4 x SFP
  • Primary Port Speed10/100/1000Mbps
  • VLAN SupportYes
  • Buffer Memory2MB
  • PoEYes
  • 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.

Highlights

  • 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

Specifications

BrandD-Link
ModelDGS-3120-48PC/SI
Network Management TypeManaged
Primary Ports44 x RJ45 + 4 x SFP
Primary Port Speed10/100/1000Mbps
VLAN SupportYes
Buffer Memory2MB
PoEYes
StackableYes
SNMPYes
QoSYes
Layer2
Power100 to 240 VAC, 50 to 60 Hz Internal Universal Power Supply
FeaturesSwitching 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
Dimensions17.3" x 14.96" x 1.73"
Weight13.96 lbs.
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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