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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

  • FormatStackable
  • StandardsIEEE 802.3af, IEEE 802.3at
  • Network Management TypeManaged
  • Primary Ports20 x RJ45 + 4 x SFP
  • Primary Port Speed10/100/1000Mbps
  • MAC Address Table16K
  • 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.

Highlights

  • 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

Specifications

BrandD-Link
ModelDGS-3120-24PC
FormatStackable
StandardsIEEE 802.3af, IEEE 802.3at
Network Management TypeManaged
Primary Ports20 x RJ45 + 4 x SFP
Primary Port Speed10/100/1000Mbps
MAC Address Table16K
Switching MethodStore and Forward
VLAN SupportYes
Jumbo FramesYes
Buffer Memory2MB
PoEYes
StackableYes
QoSYes
Layer2
Port MirroringYes
Power100~240VAC, 50/60Hz
Dimensions1.73" x 17.32" x 12.20"
Weight11.96 lbs.
Temperature0°C to 50°C (32°F to 122°F)
HumidityOperating: 10% to 90% non-condensing
Storage: 5% to 90% non-condensing
Features24-Port Gigabit xStack Layer 2+ Managed PoE Stackable Switch with 24 UTP (4 Combo SFP)
Supports 802.3af (PoE) and 802.3at (PoE Plus) on all ports
Stackable up to 6 units via 40Gbps CX4 stacking
Enhanced features including ACLs, IPv6 support, static routing, IP-MAC binding, Guest VLANs
Supports standards-based management protocols including SNMP, RMON, Telnet, a Web-based GUI and SSH/SSL
D-Link Green Technology, which includes a power saving mode, smart fan, reduced heat dissipation , cable length detection and time-based PoE
Standard Image features and Enhanced Image features for mul

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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