The Used Cisco WS-C3850-12S-S Catalyst 3850 12-Port SFP+ Ethernet Switch is part of the Cisco Catalyst 3850 Series is an enterprise-class stackable Ethernet and Multigigabit Ethernet access and aggregation layer switch. The 3850 models securely enable time-saving virtualization, greater automation, and valuable analytics data that directly address your evolving business needs, including less cost to install and operate. The Cisco Catalyst 3850 Series provides capabilities that are ideally suited to support the convergence of wired and wireless access. The 3850 offers the Cisco StackWise®-480 technology. In addition, the Cisco Catalyst 3850 Series Switches support full IEEE 802.3at Power over Ethernet Plus (PoE+), Cisco Universal Power Over Ethernet (Cisco UPOE® ), modular and field-replaceable network modules, RJ-45 and fiber-based downlink interfaces, and redundant fans and power supplies.
Cisco UPOE is a breakthrough technology, offering the following services and benefits: 60W per port to enable a variety of end devices such as Samsung VDI client, BT IP turret systems in trading floors, Cisco Catalyst compact switches in retail/hospitality environments, personal Cisco TelePresence® systems, and physical access control devices, High availability for power and guaranteed uninterrupted services, a requirement for critical applications (e911), Lowering OpEx by providing network resiliency at lower cost by consolidating backup power into the wiring closet and, Faster deployment of new campus access networking infrastructures by eliminating the need for a power outlet for every endpoint
The Cisco Catalyst 3850 Series Switches support an optional network module for uplink ports. The default switch configuration doesn’t include the uplink module. The customer has the flexibility to add optional GBe or 10GBe modules. 
Features: 

Ports: 12 x SFP Ethernet Ports
Network Module: 1 module slot, (uplinks are optional none included)
Forwarding Rate: 50.5 Mpps
Switching Capacity: 68 Gbps
Stacking Bandwidth: 480 Gbps
Total Number of MAC addresses: 32,000
Total Number of IPv4 routes: 24,000
FNF entries: 24,000
DRAM: 4 GB
Flash Memory: 2GB
VLAN IDs: 4000
Total Switched Virtual Interfaces (SVIs): 1000
Jumbo Frames: 9198 Bytes 
Total Routed Ports per 3850 Stack: 208
Number of Access points per switch/stack: 100
Number of wireless clients per switch/stack: 2000
Total number of WLANs per switch: 64
Wireless Bandwidth per switch: Up to 20 Gbps on 24-port Gigabit Ethernet model 
Supported Aironet access point series: 3600, 3500, 2600, 1600, 1260, 1140, 1040
Voltage Input: 100-240 VAC 
Available PoE Power: -
Power Supply Slots: (1) 350W AC Power Supply (supports dual redundant power supplies)
Fans: (2) fans standard
Dimensions: 1.75 x 17.5 x 17.7(inches) 
Weight: 15.48 lb (7.02 kg)

Includes: (1) 350W Power Supply, Rackmount Ears, AC Power Cord, and Console Cable