SG250X-48-K9 - 48-Port Gigabit Smart Switch w/ 4x10G Uplinks

Cisco 250 Series 48-port Gigabit Ethernet Layer 2/3 smart switch with 2x 10GBase-T and 2x SFP+ uplinks for scalable business networking.

The Cisco SG250X-48-K9 is part of the Cisco 250 Series Smart Switches, a line of affordable, next-generation switches designed for small and midsize businesses. It combines 48 Gigabit Ethernet (10/100/1000) RJ-45 ports with 4 additional 10 Gigabit Ethernet uplink ports (2x 10GBase-T and 2x SFP+), giving businesses flexible high-speed uplink or aggregation options. The switch supports Layer 2 and basic Layer 3 features such as VLANs, QoS, static routing, ACLs, and 802.1X authentication, alongside simplified management through a web-based GUI, CLI, SNMP, Cisco FindIT Network Manager, and Network Plug-and-Play. It has a rack-mountable 1U form factor, internal universal power supply, and energy-efficient operation compliant with IEEE 802.3az. This model does not provide PoE (a separate PoE variant, SG250X-48P, exists), making it suited for data-only, bandwidth-intensive network environments requiring 10-Gigabit backbone connectivity.

• Manufacturer: Cisco Systems, Inc.
• Product Family: Cisco 250 Series Smart Switches
• Product Series: SG250X
• Model: SG250X-48
• Product Type: Ethernet Smart Switch (Layer 2/3)
• Total Ports: 48x 10/100/1000 RJ-45 + 4x 10 Gigabit (2x 10GBase-T + 2x SFP+)
• PoE Support: No PoE (data only); PoE variant is SG250X-48P
• Switching Capacity: 176 Gbps
• Forwarding Rate: 130.94 Mpps (64-byte packets)
• MAC Address Table: 8,000 entries
• CPU: 800 MHz ARM CPU
• System Memory (RAM): 512 MB
• Flash Memory: 256 MB
• Packet Buffer: 24 MB
• USB Port: 1x USB 2.0 (FAT32, for config/firmware backup)
• Management: Web GUI, CLI, SNMP, Cisco FindIT Network Manager, Network Plug-and-Play (PnP)
• Security Features: ACLs, 802.1X authentication, IP Source Guard, DoS prevention, SSH/SSL
• Layer 2/3 Features: VLANs, QoS, Voice VLAN, static routing, GVRP, MSTP, IGMP Snooping, LACP
• Energy Efficiency: IEEE 802.3az Energy Efficient Ethernet (EEE) compliant
• Power Supply: Internal, universal, 100–240V AC, 50–60 Hz
• Fans: 2 (fan-cooled)
• Operating Temperature: 0°C to 50°C (32°F to 122°F)
• Storage Temperature: -20°C to 70°C (-4°F to 158°F)
• Operating/Storage Humidity: 10% to 90%, relative, non-condensing
• Certifications: UL (UL 60950), CSA (CSA 22.2), CE mark, FCC Part 15 Class A
• Warranty: Limited lifetime hardware warranty with 1 year technical support
• Form Factor: 1U, rack-mountable

• 48 Gigabit Ethernet (10/100/1000) RJ-45 ports for extensive device connectivity
• 4 additional 10 Gigabit uplink ports (2x 10GBase-T + 2x SFP+) for high-speed aggregation
• Layer 2/3 functionality including static routing and VLAN support
• Simplified setup via Network Plug-and-Play and Smart Network Application
• Cisco FindIT Network Manager support for centralized monitoring
• Advanced security with ACLs, 802.1X, and DoS attack prevention
• Energy-efficient design with IEEE 802.3az EEE and energy detect
• Rack-mountable 1U design for standard 19-inch racks
• Internal universal power supply supporting 100–240V AC
• USB port for configuration and firmware backup/restore
• Quality of Service (QoS) features for voice/video prioritization
• Limited lifetime warranty backed by Cisco Small Business Support

Designed for growing businesses needing reliable Gigabit connectivity with 10-Gigabit uplink scalability.

• Core or access-layer switch for small-to-medium business networks
• Aggregation switch connecting multiple wiring-closet switches via 10G uplinks
• Network backbone for bandwidth-intensive applications like video surveillance
• Office LAN deployment requiring VLAN segmentation and QoS
• Connecting servers or NAS devices needing 10GBase-T throughput
• Educational or retail environments needing manageable, cost-effective switching
• Data closets requiring rack-mountable, high-port-density switching

• High port density with 48 Gigabit ports
• Future-ready 10G uplinks for network scalability
• Simplified deployment via Plug-and-Play support
• Centralized management with FindIT Dashboard
• Energy-efficient, cost-effective operation
• Backed by Cisco limited lifetime warranty

• Form Factor: 1U, rack-mountable
• Dimensions (W x D x H): 17.3 x 1.73 x 10.12 in (approx.)
• Depth: 257 mm (per third-party listing)
• Heat Dissipation: 156.96 BTU/hr (approx., per third-party listing)

Per available documentation, this switch is part of the Cisco 250 Series ecosystem and is validated for use alongside:

• Cisco 250 Series Smart Switches (SG250, SF250 family)
• Cisco FindIT Network Manager for centralized management
• Cisco Small Business Support Center (SBSC) services
• Standard 19-inch equipment racks
• Cisco SFP/SFP+ transceiver modules for fiber uplinks
• Third-party PoE-powered devices connected downstream (via separate PoE injectors, since this model lacks native PoE)
• Cisco Catalyst 1200/1300 series as newer replacement switches

Note: This model (SG250X-48-K9) has reached End-of-Sale status; Cisco has designated Catalyst 1200/1300 series switches as general replacement products for the 250 Series line.

• Cisco SG250X-48 switch unit
• Power cord/adapter
• Rack-mount kit
• Console cable
• Quick Start Guide
• Technical support contact information

Q: Does the Cisco SG250X-48-K9 support Power over Ethernet (PoE)?

A: No. This variant does not provide PoE; the PoE-enabled version is the separate SG250X-48P model.

Q: How many 10 Gigabit ports does the SG250X-48-K9 have?

A: It includes 4 10-Gigabit uplink ports: 2 are 10GBase-T copper ports and 2 are SFP+ fiber slots.

Q: Is this switch stackable?

A: No, per Cisco community support guidance, the SG250 series is not stackable; the SG350X series should be used for stacking needs.

Q: What is the switching capacity of the SG250X-48-K9?

A: The switch offers a switching capacity of 176 Gbps and a forwarding rate of approximately 130.94 Mpps.

Q: Is the SG250X-48-K9 still available for purchase from Cisco?

A: No, Cisco announced End-of-Sale for this model with a last order date of October 30, 2021, though support continues through its End-of-Service-Life date.

Q: What management options are available for this switch?

A: It supports web-based GUI, CLI, SNMP, and Cisco FindIT Network Manager, along with Network Plug-and-Play for simplified deployment.

Q: What is included in the box with the SG250X-48-K9?

A: The package includes the switch unit, power cord/adapter, rack-mount kit, console cable, quick start guide, and technical support contact details.

Q: What warranty does the SG250X-48-K9 carry?

A: It is covered by Cisco's limited lifetime hardware warranty along with one year of technical support and free software fixes for the warranty term.