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Silver 1U rack-mount switch with 20 RJ45 ports and 4 SFP cages

D-Link

D-Link DGS-3120-24PC 24-port Gigabit managed PoE stackable network switch

SKU CH-XQJ2-RWZ3F

Managed Gigabit switch with 20 RJ45 and 4 SFP ports, PoE on all ports, stackable up to 6 units

  • Product formatStackable
  • Supported standardsIEEE 802.3af, IEEE 802.3at
  • Management typeManaged
  • Main ports20 x RJ45 + 4 x SFP
  • Main port speed10/100/1000 Mbit/s
  • MAC table size16K
  • 24 Gigabit ports with 20 RJ45 and 4 SFP for flexible connectivity
  • PoE and PoE+ on all ports power IP phones and cameras without extra cabling
  • Stackable up to 6 units via 40Gbps CX4 for simplified management
  • 16K MAC table and 2MB buffer handle heavy traffic with low latency
  • Layer 2+ features including ACLs, IPv6, static routing and IP-MAC binding secure the network

24-Port Gigabit Managed PoE Switch

The D-Link DGS-3120-24PC is a stackable Layer 2 managed switch with 20 RJ45 ports and four SFP combo ports. It supports IEEE 802.3af and 802.3at PoE Plus on every copper port for powering access points, cameras or VoIP phones. A 16K MAC address table and 2MB buffer handle store-and-forward switching with jumbo frame support.

Network Teams Needing PoE and Stacking

This switch suits administrators who need centralised management via SNMP, SSH, web GUI or Telnet plus advanced features such as ACLs, static routing and IP-MAC binding. It is not for buyers who require Layer 3 routing protocols, 10 Gigabit uplinks or a higher PoE power budget per port than the 802.3at standard provides.

40 Gbps CX4 Stacking for Six Units

The single specification that determines fit is the stacking capability: up to six units can be linked over 40 Gbps CX4 connections to operate as a single logical switch. If your design does not need multi-chassis stacking, a standalone managed PoE switch with the same port count may be simpler.

How it compares

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

Price $1,179.99
Pricier than about 68% of the 2,759 comparable items (median $482.99).

Specifications

Product
Brand nameD-Link
Model nameDGS-3120-24PC
Memory
Buffer size2 MB
Connectivity
Supported standardsIEEE 802.3af, IEEE 802.3at
Management typeManaged
Main port speed10/100/1000 Mbit/s
MAC table size16K
Switching modeStore and Forward
VLAN capabilityYes
Jumbo frame supportYes
Stacking supportYes
Layer support2
Port mirroring supportYes
Ports & slots
Main ports20 x RJ45 + 4 x SFP
Power
Power over EthernetYes
Power details100 to 240VAC, 50/60 Hz
Size & build
Product dimensions1.73 in × 17.32 in × 12.2 in
Product weight11.96 lb (5.43 kg)
Environment & compliance
Temperature range0 °C to 50 °C (32 °F to 122 °F)
Humidity rangeOperating: 10% to 90% non-condensing
Storage: 5% to 90% non-condensing
More details
Product formatStackable

Questions about this item

Should I pick the 20 RJ45 ports or the 4 SFP combo ports for my uplinks?

Use the 20 RJ45 ports for copper connections to endpoints and the 4 SFP combo ports for fibre uplinks; both share the same 24-port budget.

What does the 16K MAC address table mean for daily traffic?

It lets the switch learn up to 16K device addresses so forwarding stays in hardware even on a busy Layer 2 network.

How does the IEEE 802.3af/at PoE standard limit power on each port?

Each port follows 802.3af or 802.3at negotiation, so power is capped at the class the connected device requests.

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