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WS-C3550-24-DC-SMI
Cisco WS-C3550-24-DC-SMI Catalyst 3550 24-Port Fast Ethernet...
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WS-C3550-24-DC-SMI is a DC-powered, managed Layer 2+ access switch with 24 autosensing 10/100 Ethernet ports and two fixed GBIC-based Gigabit Ethernet uplink slots. The non-PoE configuration connects separately powered endpoints rather than supplying power through their network cables. Its full-width, 1U chassis belongs to the Catalyst 3550 family, with the Standard Multilayer Software Image supplied for basic IP routing. The Cisco Catalyst 3550-24-DC accepts compatible copper or fiber GBICs, allowing the uplink medium to match the existing installation. The discontinued WS-C3550-24PWR-SMI differs by providing integrated inline power. For an existing enterprise access installation, the defining checks are the DC power arrangement, endpoint interface speed and required software feature set.
WS-C3550-24-DC-SMI price for new stock is is available on request. Get immediate quote. WS-C3550-24-DC-SMI refurb price is $302.40.
Request bulk order quote for WS-C3550-24-DC-SMI for additional pricing. Browse the full Cisco 3550 Catalyst Switches series or explore all Cisco products.
8.8 Gbps switching capacity provides the switching fabric for the access ports and Gigabit uplinks. Static routing and RIP support basic routed connectivity under the supplied software; OSPF, EIGRP, BGP and PIM require the enhanced image rather than the standard configuration. WS-C3550-24-DC-SMI carries 64 MB of DRAM and 16 MB of flash for its operating software and stored files. Four egress queues, weighted round-robin scheduling, strict-priority queuing and WRED provide traffic-handling controls, while access control lists support traffic filtering. Administration includes the Cisco IOS CLI, SSHv2, Telnet, SNMP, CiscoWorks and browser-based Cisco Cluster Management Suite software. Express Setup provides a browser-based configuration path, and embedded RMON supports monitoring. GigaStack expansion uses compatible GBIC hardware, not a dedicated rear stacking interface.
Specify WS-C3550-24-DC-SMI in new sealed or certified refurbished condition, and confirm the required accessories and installed software before placing the PO. Certified refurbished units are inspected and bench-tested for power-on and POST, every port linking at rated speed and a clean boot; managed units also have firmware verified and configurations wiped to factory default. ORM's warranty is up to a 3-year extended term for new units or up to 1 year for certified refurbished units, with 30-day returns on every condition; terms apply. Cisco hardware coverage has ended; enterprise and volume orders can use PO acceptance, government Net-30, RMA with advance replacement and regional stock/RMA coverage across the UK, EU, US and MEA.
| Key Specs | Key Spec Values |
|---|---|
Operating System | Cisco IOS |
License Tier | Standard Multilayer Software Image |
Port Configuration | 24 x 10/100, 2 x 1G GBIC |
Stacking | GigaStack, nine members |
Lifecycle Status | Retired; Cisco hardware support has ended |
When reproducing an existing switch configuration for a lab or replacement unit, the supported maximum of 1005 VLANs provides a concrete boundary for configuration review. Keep the intended VLAN inventory separate from assumptions about advanced routing, and specify the required installed software image before the purchase order is released.
When a replacement chassis must fit an existing equipment rack, missing mounting hardware can change the accessory order even when the switch itself matches. RCKMNT-1RU= is the compatible rack-mount kit for this model. Confirm whether RCKMNT-1RU= is included with the selected unit or must appear separately on the purchase order.
Gigabit speeds on every access port
The 24 copper access ports operate at 10/100 Mbps, not Gigabit Ethernet. The Gigabit interfaces are the two GBIC uplink slots, so they cannot provide Gigabit access across the copper port bank.
Switch-powered phones or wireless access points
The copper access ports do not provide inline power. Endpoints requiring power through Ethernet need a separate compatible power arrangement; DC input powers the chassis, not connected devices.
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| WS-C3550-24-DC-SMI |  WS-C3550-24-EMI |  WS-C3550-24-SMI |  WS-C3550-12G |  WS-C3550-48-SMI | |
|---|---|---|---|---|---|
| Ethernet Technology | Fast Ethernet | Fast Ethernet | Fast Ethernet | Gigabit Ethernet | Fast Ethernet |
| Flash Memory | 16 MB | 16 MB | 16 MB | 16 MB | 16 MB |
| Form Factor | Rack-Mount 1U | Rack-Mount 1U | Rack-Mount 1U | Rack-Mount 1.5U | Rack-Mount 1U |
| Height | 44.45 mm | 44.5 mm | 44.5 mm | 67 mm | 44.5 mm |
| Manufacturer Part Number | WS-C3550-24-DC-SMI | WS-C3550-24-EMI | WS-C3550-24-SMI | WS-C3550-12G | WS-C3550-48-SMI |
| Memory | 64 MB | 64 MB | 64 MB | 64 MB | 64 MB |
| Switching Capacity | 8.8 Gbps | 8.8 Gbps | 8.8 Gbps | 24 Gbps | 13.6 Gbps |
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Every device is inspected, bench-tested, and firmware-verified, with configurations wiped before dispatch. Additional testing can be arranged to confirm full working condition on request.
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WS-C3550-24-DC-SMI identifies Catalyst 3550 hardware with 24 access ports, DC power and the Standard Multilayer Software Image. The access ports operate at 10/100 Mbps, and two additional GBIC-based Gigabit Ethernet slots provide uplinks. SMI identifies the supplied software feature set, not an Ethernet port type.
WS-C3550-24-DC-SMI supports Cisco IOS CLI administration, including console access, SSHv2 and Telnet, plus browser-based Cisco Cluster Management Suite and Express Setup. SNMP, CiscoWorks and RMON provide additional management and monitoring paths. These are software-based administration options, so confirm compatibility with the management environment used for an existing installation.
WS-C3550-24-DC-SMI belongs to the retired Catalyst 3550 family, and Cisco hardware support has ended. Separately, the software product C3550-24-DC-SMI-SW reached its last date of support on September 30, 2025. That software milestone must not be treated as the hardware retirement date or a new hardware support entitlement.
ORM Systems offers WS-C3550-24-DC-SMI new sealed or certified refurbished, with up to a 3-year extended warranty for new units and up to 1 year for certified refurbished units. Both conditions include 30-day returns; terms apply. Cisco hardware warranty coverage has ended, so the applicable order warranty is ORM's.
WS-C3550-24-DC-SMI ships with SMI, later named IP Base; EMI, later named IP Services, provides the enhanced feature set. CD-3550-EMI= is the associated upgrade kit for this hardware. Confirm the installed image and upgrade entitlement when advanced routing is required, rather than assuming an SMI unit includes enhanced functionality.
No, WS-C3550-24-DC-SMI does not provide inline power on its access ports. The DC designation describes the chassis power input, not power delivered to phones, access points or other endpoints. Connected equipment must have its own suitable power arrangement when its Ethernet connection does not supply power.
The Catalyst 3550-24-DC accepts Gigabit GBICs including WS-G5484= for multimode fiber, WS-G5486= for single-mode or multimode fiber, and WS-G5487= for single-mode fiber. WS-G5483= provides a copper Gigabit connection. Match the selected GBIC to the remote interface, fiber type and required connection before defining the accessory order.
GigaStack connects nine Catalyst 3550 switches using compatible GBIC hardware. WS-X3500-XL is the GigaStack stacking GBIC supplied with a 50 cm cable, while CAB-GS-1M provides a 1 m cable option. GigaStack connectivity occupies GBIC capacity, so account for the interface needed when retaining existing uplink connections.
Yes, the Catalyst 3550-24-DC uses a full-width 1U chassis measuring 44.45 mm high, 444.5 mm wide and 365.76 mm deep. RCKMNT-1RU= is the compatible rack-mount kit. For a replacement order, confirm whether RCKMNT-1RU= accompanies the chosen unit or needs a separate line on the purchase order.
WS-C3550-24-DC-SMI has non-powered access ports, whereas WS-C3550-24PWR-SMI provides integrated inline power. Both are discontinued Catalyst 3550 models. The DC model addresses an existing installation with separately powered endpoints; the inline-power model addresses an existing installation that depends on switch-delivered endpoint power, subject to the endpoint's power compatibility.
WS-C3550-24-DC-SMI includes the standard software image, while WS-C3550-24-EMI includes the enhanced software image for advanced IP routing. Both models are discontinued. The standard image suits an existing configuration using basic routing; the enhanced image suits an existing configuration requiring features such as OSPF or EIGRP without assuming an upgrade is included.
WS-C3550-24-DC-SMI provides 24 Fast Ethernet access ports, while WS-C3550-48-SMI provides 48 Fast Ethernet access ports. Both are discontinued models. The smaller port count suits an existing replacement requirement with fewer copper connections; the higher-density model suits an existing requirement for more connections, with power compatibility checked separately.
United States
