Figure 1. Cisco Catalyst 3850 Series Switches
Product Overview
• Integrated wireless controller capability with:
– Up to 40G of wireless capacity per switch (48-port models)
– Support for up to 50 access points and 2000 wireless clients on each switching entity (switch or stack)
• 24 and 48 10/100/1000 data PoE+ and Cisco UPOE models with energy-efficient Ethernet (EEE)
– Cisco StackWise-480 technology provides scalability and resiliency with 480 Gbps of stack throughput
– Cisco StackPower™ technology provides power stacking among stack members for power redundancy
– Three optional uplink modules with 4 x Gigabit Ethernet, 2 x 10 Gigabit Ethernet, or 4 x 10 Gigabit Ethernet ports
– Dual redundant, modular power supplies and three modular fans providing redundancy
– Full IEEE 802.3at (PoE+) with 30W power on all ports in 1 rack unit (RU) form factor
– Cisco UPOE with 60W power per port in 1 rack unit (RU) form factor
• Software support for IPv4 and IPv6 routing, multicast routing, modular quality of service (QoS), Flexible NetFlow (FNF) Version 9, and enhanced security features
• Single universal Cisco IOS® Software image across all license levels, providing an easy upgrade path for software features
• Enhanced limited lifetime warranty (E-LLW) with next business day (NBD) advance hardware replacement and 90-day access to Cisco Technical Assistance Center (TAC) support
Table 1. Cisco Catalyst 3850 Series Configurations
| Models | Total 10/100/1000 Ethernet Ports | Default AC Power Supply | Available PoE Power | StackPower |
| WS-C3850-24T | 24 | 350 WAC | - | Yes |
| WS-C3850-48T | 48 | |||
| WS-C3850-24P | 24 PoE+ | 715 WAC | 435W | |
| WS-C3850-48P | 48 PoE+ | |||
| WS-C3850-48F | 48 PoE+ | 1100 WAC | 800W | |
| WS-C3850-24U | 24 UPOE | 1100 WAC | 800W | |
| WS-C3850-48U | 48 UPOE | 1100 WAC | 800W |
Network Modules
The Cisco Catalyst 3850 Series Switches support three optional network modules for uplink ports. The default switch configuration doesn't include the uplink module. At the time of switch purchase the customer has the flexibility to choose from the network modules described in Table 2.
Figure 2 shows various network modules:
• 4 x Gigabit Ethernet with Small Form-Factor Pluggable (SFP)
• 2 x 10 Gigabit Ethernet with SFP+ or 4 x Gigabit Ethernet with SFP
• 4 x 10 Gigabit Ethernet with SFP+ (supported on the 48-port models only)
Figure 2. Network Modules with Four Gigabit Ethernet, Two 10 Gigabit Ethernet SFP+, or Four 10 Gigabit Ethernet SFP+ Interfaces
Table 2. Network Module Numbers and Descriptions
| Product Number | Product Description |
| C3850-NM-4-1G | 4 x Gigabit Ethernet network modules |
| C3850-NM-2-10G | 4 x Gigabit Ethernet/2 x 10 Gigabit Ethernet network modules |
| C3850-NM-4-10G | 4 x Gigabit Ethernet/4 x 10 Gigabit Ethernet network modules |
Figure 3. Dual Redundant Power Supplies
Table 3. Power Supply Models
| Models | Default Power Supply | Available PoE Power |
| 24-port data switch | PWR-C1-350WAC | - |
| 48-port data switch | ||
| 24-port PoE switch | PWR-C1-715WAC | 435W |
| 48-port PoE switch | ||
| 48-port full PoE switch | PWR-C1-1100WAC | 800W |
| 24-port UPOE switch | PWR-C1-1100WAC | 800W |
| 48-port UPOE switch |
Table 4. Power Supply Requirements for PoE ,PoE+ , UPOE
| 24-Port PoE Switch | 48-Port PoE Switch | |
| PoE on all ports (15.4W per port) | One PWR-C1-715WAC | One PWR-C1-1100WAC or two PWR-C1-715WAC |
| PoE+ on all ports (30W per port) | One PWR-C1-1100WAC or two PWR-C1-715WAC | Two PWR-C1-1100WAC or one PWR-C1-1100WAC and one PWR-C1-715WAC |
| 24-Port UPOE Switch | 48-Port UPOE Switch | |
| UPOE (60W per port) on all (24 port switch) or max. 30 ports (48 port switch) | One PWR-C1-1100WAC and one PWR-C1-715WAC | Two PWR-C1-1100WAC |
Figure 5. StackWise-480 and StackPower Connectors
StackPower can be deployed in either power-sharing mode or redundancy mode. In power-sharing mode, the power of all the power supplies in the stack is aggregated and distributed among the switches in the stack. In redundant mode, when the total power budget of the stack is calculated, the wattage of the largest power supply is not included. That power is held in reserve and used to maintain power to switches and attached devices when one power supply fails, enabling the network to operate without interruption. Following the failure of one power supply, the StackPower mode becomes power sharing.
StackPower allows customers to simply add one extra power supply in any switch of the stack and either provide power redundancy for any of the stack members or simply add more power to the shared pool. StackPower eliminates the need for an external redundant power system or installation of dual power supplies in all the stack members. StackPower is available in LAN Base license level (or higher). For LAN Base, cables need to be purchased separately.