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SX350X-12-K9
Cisco SX350X-12-K9 350X 10-Port 10 Gigabit Switch, 2x10G Com...
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SX350X-12-K9 provides managed Layer 2+ switching through ten dedicated 10GBASE-T access ports and two fixed 10G copper/SFP+ combo interfaces, giving twelve active network connections. The combo interfaces accept copper or fiber connections, with one medium active on each interface. This non-PoE, rack-mount 1U member of the Cisco 350X Series connects separately powered business equipment without allocating an endpoint power budget. The discontinued SG350X-12PMV-K9-NA differs by providing PoE+ for powered endpoints, with lower-speed copper downlinks rather than equivalent 10G access connectivity. Buyers retaining an existing installation should distinguish the required access connections from the shared uplink interfaces before specifying connection media.
SX350X-12-K9 price for new stock is $828.45. SX350X-12-K9 refurb price is $1,976.73. SX350X-12-K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for SX350X-12-K9 for additional pricing. Browse the full Cisco SX350X Switches series or explore all Cisco products.
240 Gbps switching capacity provides nonblocking connectivity across the active network interfaces. 178.56 Mpps forwarding handles 64-byte packets at the published maximum rate. Static IPv4 routing supports 990 routes and 128 IP interfaces for inter-VLAN forwarding; IPv6 static routing supports 245 routes and 106 interfaces, rather than dynamic routing. SX350X-12-K9 uses 512 MB of memory and 256 MB of flash for its embedded software and configuration storage. The SX350X-12 supports 32000 MAC addresses for learned endpoints, while STP, RSTP, MSTP, and LACP provide loop control and link aggregation. Eight hardware queues allow traffic-class scheduling, and access control supports 2000 entries for ingress or egress filtering. A dedicated Gigabit Ethernet management connection separates administration from production interfaces. 64.1W maximum power consumption provides the upper figure for electrical planning, while two fans cool the internal hardware.
ORM Systems supplies SX350X-12-K9 new sealed or certified refurbished; refurbished units are inspected and bench-tested, including optics bay recognition, PSU and fan status checks, firmware verification, and configuration wiping to factory default. Specify the condition, regional ordering form, and connection accessories on the purchase order; ORM warranties are up to 3-year extended for new hardware and up to 1 year for certified refurbished, with 30-day returns on every condition, terms apply. Cisco's separate Limited Lifetime hardware warranty is bounded by July 31, 2027 for the North American form. Enterprise and volume orders can use PO acceptance, Net-30 for government, and RMA with advance replacement across UK, EU, US, and MEA regional operations.
| Key Specs | Key Spec Values |
|---|---|
Port Configuration | 10 x 10G copper / 2 x 10G combo |
Stacking | Hardware stacking / 4 members |
Max Power Draw | 64.1W |
Cooling | 2 fans |
Lifecycle Status | End of sale July 30 2022 (North America) |
Replacement PID | C1300-12XT-2X (current successor) |
When replacing a discontinued SG350XG-2F10-K9-NA, this model follows the original replacement relationship rather than representing a current-generation purchase. Cisco support for that predecessor ended June 30, 2025. Before issuing a matching-spare purchase order, specify whether the requirement is continuity with existing hardware or a separate migration project.
When a staging environment must reproduce bursty traffic before hardware enters service, the shared 3 MB packet buffer is a relevant test constraint. Buffer capacity is shared across network ports rather than reserved per connection. Define the traffic mix, congestion cases, and acceptance checks before specifying the lab order.
When multiple locations need the same starting configuration, text-editable configuration files and secure SCP transfer support a repeatable staging process. Dual software images provide separate image storage during maintenance preparation. Specify the approved configuration, required software image, and site-specific changes before the purchase order and staging instructions are finalized.
PoE power for connected endpoints
The network ports supply no PoE power. Phones, cameras, and access points requiring Ethernet-delivered power need a separate power source or a powered-port switch.
Twelve copper connections plus separate fiber
The two SFP+ interfaces share copper connections, so fourteen independent links are unavailable. C1300-12XT-2X provides twelve 10G copper ports plus two dedicated 10G SFP+ uplinks.
Fanless operation in occupied rooms
Two cooling fans operate in this chassis, so the switch does not provide fanless operation. Installation plans must accommodate active cooling and its associated acoustic output.
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| SX350X-12-K9 |  SX350X-24-K9-NA |  SX350X-08-K9-EU |  SX350X-08-K9 |  SX350X-08-K9-UK | |
|---|---|---|---|---|---|
| Depth | 203 mm | 350 mm | 203 mm | 203 mm | 203 mm |
| Ethernet Technology | 10 Gigabit Ethernet | 10 Gigabit Ethernet | 10 Gigabit Ethernet | 10 Gigabit Ethernet | 10 Gigabit Ethernet |
| Flash Memory | 256 MB | 256 MB | 256 MB | 256 MB | 256 MB |
| Form Factor | Rack-Mount 1U | Rack-Mount 1U | Rack-Mount 1U | Rack-Mount 1U | Rack-Mount 1U |
| Height | 44 mm | 44 mm | 44 mm | 44 mm | 44 mm |
| Manufacturer Part Number | SX350X-12-K9 | SX350X-24-K9-NA | SX350X-08-K9-EU | SX350X-08-K9 | SX350X-08-K9-UK |
| Memory | 512 MB | 512 MB | 512 MB | 512 MB | 512 MB |
| Power Consumption | 64.1W | 124.5W | 50.3W | 50.3W | 50.3W |
| Switching Capacity | 240 Gbps | 480 Gbps | 160 Gbps | 160 Gbps | 160 Gbps |
| Weight | 2.93 kg | 5.1 kg | 2.98 kg | 2.98 kg | 2.98 kg. |
| Width | 440 mm | 440 mm | 440 mm | 440 mm | 440 mm |
Every unit is authentic, sourced through trusted and authorised channels, and serial-verified on request. Genuine networking and IT hardware, guaranteed, or your money back.
New products are backed by up to 3 years of extended warranty, and certified refurbished units by up to 3 months, for dependable protection on every order. Coverage is clear, honoured in full, and confirmed on each product page.
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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.
Our specialists assist with compatibility, configuration, licensing, and installation, before and after you buy. Real hardware expertise, whenever you need it.
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SX350X-12-K9 identifies the SX350X 12-port 10GBASE-T stackable managed switch: SX350X is the model family and 12 is the total network-port count. The North American ordering form is SX350X-12-K9-NA, retaining K9 and adding the regional suffix. Two copper interfaces share their connections with the SFP+ cages.
SX350X-12-K9 supports HTTP/HTTPS web management, console or SSH/Telnet CLI, SNMP, Smart Network Application, Cisco FindIT Network Manager, embedded FindIT Network Probe, and Active Advisor. The dedicated Gigabit Ethernet management port provides an out-of-band connection, while the full and menu CLI support scripted administration.
Yes, the North American SX350X-12-K9 ordering form reached end of sale July 30, 2022, with Cisco support ending July 31, 2027. Software maintenance ended July 30, 2023. Regional dates differ: Cisco support for the Chinese SX350X-12-K9-CN form ended February 28, 2026.
ORM Systems offers SX350X-12-K9 new sealed and certified refurbished, with separate ORM warranties: new hardware up to 3-year extended and certified refurbished up to 1 year. Returns are 30 days on every condition; terms apply. Cisco's platform warranty is Limited Lifetime, bounded by July 31, 2027 for the North American form.
SX350X-12-K9 regional forms replaced SG350XG-2F10-K9-AU, SG350XG-2F10-K9-BR, SG350XG-2F10-K9-CN, SG350XG-2F10-K9-EU, SG350XG-2F10-K9-JP, SG350XG-2F10-K9-NA, and SG350XG-2F10-K9-UK. Those predecessor models reached end of sale June 18, 2020, and Cisco support ended June 30, 2025. The corresponding replacement region must match the intended installation; this replacement family is also discontinued.
SX350X-12-K9 provides two fixed 10G combo uplink interfaces, each using either its copper connector or its SFP+ cage. The fiber cages are not additional connections beyond the twelve network interfaces. Selecting fiber for either combo interface makes that interface's corresponding copper connector unavailable at the same time.
Four Cisco 350X members form one hardware stack, with SG350X, SG350XG, and SX350X models permitted together. Ring and chain arrangements are supported, and stack interconnects use 10G copper or fiber interfaces. Allocate the selected network interfaces to stack links before specifying endpoint connections and interconnect accessories.
Yes, SX350X-12-K9 supports static IPv4 routing with 990 routes and 128 IP interfaces for inter-VLAN connectivity. IPv6 static routing supports 245 routes and 106 interfaces. Routing interfaces can be physical ports, link aggregation groups, VLAN interfaces, or loopback interfaces; the routing capability is static rather than dynamic.
The Cisco 350X 12-port 10G switch uses an internal universal AC power supply accepting 100-240V AC at 47-63 Hz. Maximum consumption is 64.1W, so electrical planning should use the switch's consumption rather than an endpoint PoE allowance. The network interfaces do not supply power to connected devices.
SX350X-12-K9 provides unpowered 10G copper connections, while SG350X-12PMV-K9-NA supplies PoE+ with a 375W budget and downlinks rated through 5G. Both models are discontinued. The former suits separately powered 10G equipment; the latter addresses legacy powered-endpoint requirements rather than equivalent 10G copper connectivity.
SX350X-12-K9 has twelve network interfaces, whereas SX350X-08-K9-NA has eight; each includes two copper/SFP+ combo interfaces within that total. Both are discontinued models. The twelve-interface version accommodates larger existing connection requirements, while the eight-interface version addresses smaller legacy installations where the reduced connection count is sufficient.
C1300-12XT-2X provides two dedicated 10G SFP+ uplinks, whereas SX350X-12-K9 shares its two SFP+ connections with copper interfaces. C1300-12XT-2X is the current successor after the discontinued CBS350-12XT-NA. The older switch addresses matching legacy requirements; the successor suits buyers needing fiber uplinks without consuming copper connections.
United States
