Cisco WS-C3750G-12S-SD
Catalyst 3750 12 SFP DC powered + IPB
Product Highlights
What's Included
Deploying Gigabit Ethernet aggregation in environments that rely on DC power — such as central offices, telecom facilities, and remote industrial sites — demands a switch that combines fiber density with power-supply flexibility. The Cisco WS-C3750G-12S-SD is the DC-powered variant of the Catalyst 3750G-12S, delivering 12 SFP-based Gigabit Ethernet ports in a compact 1RU stackable chassis powered by –36 to –72 VDC input.
Built on Cisco StackWise technology, the WS-C3750G-12S-SD provides a 32 Gbps stacking interconnect that lets you combine up to nine switches into a single, unified management domain. This simplifies configuration, enhances resiliency, and scales bandwidth without adding management complexity. With 17.8 Mpps forwarding performance and Layer 3 routing capabilities, the switch handles inter-VLAN routing, static routes, RIP, and HSRP at the network edge.
Shipped with the IP Base (IPB) software image, the WS-C3750G-12S-SD supports advanced QoS, ACLs, rate limiting, and basic Layer 3 routing out of the box — with an upgrade path to IP Services for advanced unicast and multicast routing. Ideal for wiring-closet aggregation, small-network backbones, and DC-powered environments, this switch is a proven workhorse for organizations maintaining or extending legacy Catalyst 3750 deployments. Note: This product is End-of-Life (EOL); it remains a cost-effective option for spares, replacements, and budget-conscious expansions of existing 3750 stacks.
Features & Benefits
DC Power for Specialized Environments
The WS-C3750G-12S-SD accepts –36 to –72 VDC input, making it ideal for central-office, telecom, and industrial deployments where AC power is unavailable or impractical. At just 94 W power consumption, it operates efficiently within DC power budgets.
Cisco StackWise Technology
The 32 Gbps StackWise interconnect allows up to nine Catalyst 3750 switches to operate as a single logical switch. This delivers unified management, cross-stack EtherChannel, and automatic failover — reducing administrative overhead while improving network resiliency.
High-Density Gigabit SFP Connectivity
With 12 SFP slots supporting Gigabit Ethernet optics, the switch provides flexible fiber connectivity for aggregating access-layer switches or building small backbone networks. SFP modularity lets you mix single-mode, multi-mode, and copper transceivers to match your cabling infrastructure.
Layer 3 Routing & Intelligent Services
The IP Base image delivers hardware-based Layer 3 forwarding with static routing, RIP, and HSRP, plus advanced QoS, ACLs, and rate limiting. Upgrade to the IP Services image to unlock OSPF, EIGRP, and IP multicast routing for more complex network topologies.
Compact & Rack-Ready
At just 1.73 × 17.5 × 12.8 inches and 10 lbs, the 1RU chassis fits standard 19-inch racks. The included RCKMNT-1RU rackmount kit ensures quick, tool-standard installation with no additional hardware purchases required.
Deployment Scenarios
Telecom Central Office Aggregation
Aggregate multiple access-layer switches over fiber in a central-office environment powered by –48 VDC. The DC input eliminates the need for AC-to-DC conversion, reducing points of failure and aligning with standard telco power infrastructure.
Wiring Closet Fiber Aggregation
Use the 12 SFP ports to aggregate uplinks from edge switches across a campus or building. StackWise stacking lets you scale port density incrementally while managing the entire stack as a single IP address.
Remote or Industrial Site Backbone
Deploy as a small-network backbone in remote facilities, utility substations, or industrial plants where DC power is the standard. Layer 3 routing enables inter-VLAN communication without a separate router.
Spare / Replacement for Existing 3750 Stacks
Maintain operational continuity for existing Catalyst 3750G stacks by keeping a pre-configured spare on hand. The WS-C3750G-12S-SD is a drop-in replacement for DC-powered 3750G-12S deployments.
General
Interfaces
Performance
Memory
Power
Physical
Environmental
Compatibility Notes
SFP Compatibility: Supports Cisco 1000BASE SFP modules including GLC-SX-MMD (multimode), GLC-LH-SMD (single-mode), GLC-T (copper RJ-45), and GLC-ZX-SMD (extended reach). Third-party SFPs may require the service unsupported-transceiver command.
StackWise Cables: Requires CAB-STACK-50CM, CAB-STACK-1M, or CAB-STACK-3M stacking cables (sold separately) to form a stack ring.
Software: Ships with IP Base (IPB) image. Upgradeable to IP Services or Advanced IP Services via Cisco IOS license. Last supported IOS train for the 3750G platform should be verified against Cisco's download portal.
Power: This is a DC-powered model (–36 to –72 VDC). It is not compatible with AC power sources or the Cisco RPS 2300 redundant power system. Ensure your facility provides compliant DC power.
EOL Status: The Cisco Catalyst 3750G series reached End-of-Sale on January 30, 2013. No new Cisco TAC support contracts are available. This product is best suited for spares, lab use, or extending existing deployments.
Downloads & Resources
Frequently Asked Questions
| Part Number | Product | Key Difference |
|---|---|---|
| WS-C3750G-12S-S | Catalyst 3750G 12 SFP IP Base (AC) | AC-powered version of the same 12-port SFP switch — choose this if your site uses standard AC power. |
| WS-C3750G-12S-E | Catalyst 3750G 12 SFP IP Services (AC) | AC-powered with IP Services image — includes OSPF, EIGRP, and multicast routing for advanced Layer 3 needs. |
| WS-C3750G-24TS-1U | Catalyst 3750G 24-Port 10/100/1000 + 4 SFP | 24 copper Gigabit ports plus 4 SFP uplinks in 1RU — better suited for direct endpoint connectivity. |
| WS-C3750X-12S-S | Catalyst 3750-X 12 SFP IP Base | Next-generation successor with improved performance, optional network modules, and longer support lifecycle. |