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Table Of Contents
Product Overview
The Catalyst 3850 series switches are Ethernet switches to which you can connect devices such as
Cisco IP Phones, Cisco Wireless Access Points, workstations, and other network devices such as servers, routers, and other switches.The Catalyst 3850 switches support stacking through Cisco StackWise-480 technology and power management through StackPower. The StackWise technology for the Catalyst 3850 switches is called StackWise-480.
Unless otherwise noted, the term switch refers to a standalone switch and to a switch stack.
Switch Models
Table 1-1 Catalyst 3850 Switch Models
Catalyst 3850-24T-L
LAN Base
Stackable 24 10/100/1000 Ethernet ports,
1 network module slot1 , 350-W power supplyCatalyst 3850-48T-L
LAN Base
Stackable 48 10/100/1000 Ethernet ports,
1 network module slot1, 350-W power supplyCatalyst 3850-24P-L
LAN Base
Stackable 24 10/100/1000 PoE+2 ports,
1 network module slot1, 715-W power supplyCatalyst 3850-48P-L
LAN Base
Stackable 48 10/100/1000 PoE+ ports,
1 network module1 slot, 715-W power supplyCatalyst 3850-48F-L
LAN Base
Stackable 48 10/100/1000 full PoE ports,
1 network module1 slot, 1100-W power supplyCatalyst 3850-24T-S
IP Base
Stackable 24 10/100/1000 Ethernet ports,
1 network module slot1, 350-W power supplyCatalyst 3850-48T-S
IP Base
Stackable 48 10/100/1000 Ethernet ports,
1 network module slot1, 350-W power supplyCatalyst 3850-24P-S
IP Base
Stackable 24 10/100/1000 PoE+ ports,
1 network module slot, 715-W power supplyCatalyst 3850-48P-S
IP Base
Stackable 48 10/100/1000 PoE+ ports,
1 network module1 slot, 715-W power supplyCatalyst 3850-48F-S
IP Base
Stackable 48 10/100/1000 full PoE ports,
1 network module1 slot, 1100-W power supplyCatalyst 3850-24T-E
IP Services
Stackable 24 10/100/1000 Ethernet ports,
1 network module slot1, 350-W power supplyCatalyst 3850-48T-E
IP Services
Stackable 48 10/100/1000 Ethernet ports,
1 network module slot1, 350-W power supplyCatalyst 3850-24P-E
IP Services
Stackable 24 10/100/1000 PoE+ ports,
1 network module slot1, 715-W power supplyCatalyst 3850-48P-E
IP Services
Stackable 48 10/100/1000 PoE+ ports,
1 network module1 slot, 715-W power supplyCatalyst 3850-48F-E
IP Services
Stackable 48 10/100/1000 full PoE ports,
1 network module1 slot, 1100-W power supply
1 For supported network modules, see Table 1-2.
2 PoE+ = Power over Ethernet plus (provides up to 30 W per port).
Front Panel
This section describes the front panel components:
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24 or 48 downlink ports of one of these types:
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All of the switches have similar components. See Figure 1-1 and Figure 1-2 for examples.
Note
Figure 1-1 Catalyst 3850-48P-L Switch Front Panel
Mode button
USB mini-Type B (console) port
Status LEDs
10/100/1000 PoE+ Ethernet ports
USB Type A storage port
Network module
Figure 1-2 Catalyst 3850-24P-L Switch Front Panel
Mode button
USB mini-Type B (console) port
Status LEDs
10/100/1000 PoE+ Ethernet ports
USB Type A storage port
Network module
10/100/1000 Ethernet Ports
The 10/100/1000 Ethernet ports use RJ-45 connectors with Ethernet pinouts. The maximum cable length is 328 feet (100 meters). The 100BASE-TX and 1000BASE-T traffic requires Category 5, Category 5e, or Category 6 unshielded twisted pair (UTP) cable. The 10BASE-T traffic can use Category 3 or Category 4 UTP cable.
For information about the 10/100/1000 Ethernet port connections and specifications, see the "10/100/1000 Ethernet Port Connections" section and "Connector and Cable Specifications."
PoE and PoE+
The PoE+ ports use the same connectors as described in the "10/100/1000 Ethernet Ports" section.
They provide:
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See Table 1-17 for the power supply matrix that defines the available PoE and PoE+ power per port.
Note
For information about power supply modules, PoE+ port connections, and PoE+ specifications, see the "Power Supply Modules" section, the "PoE+ Port Connections" section, and "Connector and Cable Specifications."
Management Ports
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You can connect the switch to a host such as a Windows workstation or a terminal server through the Ethernet management port, the RJ-45 console port, or the USB console port (USB mini-Type B port).
The USB console port connection uses a USB Type A to 5-pin mini-Type B cable. The USB console interface speeds are the same as the RJ-45 console interface speeds.
USB Mini-Type B Port
The switch provides a USB mini-Type B console connection on the front panel, and the RJ-45 console port on the switch rear panel. Console output is always active on both connectors, but console input is active on only one connector at a time, with the USB connector taking precedence over the RJ-45 connector.
Use a USB type-A-to-USB 5-pin mini-Type B cable to connect a PC or other device to the switch. The required USB cable is included in the optional accessory kit.
The connected device must include a terminal emulation application.
Windows PCs need a driver for the USB port. See the "Installing the Cisco Microsoft Windows USB Device Driver" section for installation instructions.
When the switch detects a valid USB connection to a powered device, input from the RJ-45 console port is immediately disabled, and input from the USB console is enabled. Removing the USB connection immediately reenables input from the Ethernet connection. An LED on the switch front panel (see Figure 1-4) is green when the USB console connection is enabled.
The switch provides a configurable inactivity timeout that reactivates the RJ-45 console if no input activity has occurred on the USB console for a specified time period. After the USB console has been deactivated due to a timeout, you can restore its operation by disconnecting and reconnecting the USB cable. You can disable USB console operation by using Cisco IOS commands. See the switch software configuration guide for details.
Note
Figure 1-3 USB Mini-Type B Port
You can use the command-line interface (CLI) to configure an inactivity timeout which reactivates the RJ-45 console if the USB console has been activated and no input activity has occurred on the USB console for a specified time period.
After the USB console deactivates due to inactivity, you cannot use the CLI to reactivate it. Disconnect and reconnect the USB cable to reactivate the USB console. For information on using the CLI to configure the USB console interface, see the switch software guide.
USB Type A Port
The USB Type A interface provides access to external USB flash devices (also known as thumb drives or USB keys).
The interface supports Cisco USB flash drives with capacities from 64 MB to 1 GB.
Cisco IOS software provides standard file system access to the flash device: read, write, erase, and copy, as well as the ability to format the flash device with a FAT file system.
For more information about the switch management ports, see the switch software configuration guide and the command reference on Cisco.com and the "Connector Specifications" section.
Network Modules
The switch supports one hot-swappable network module that provides uplink ports to connect to other devices. The switch should only be operated with either a network module or a blank module installed.
The switch generates logs when you insert or remove a network module with SFP ports.
Table 1-2 Network Modules
C3850-NM-4-1G
This module has four 1-Gigabit SFP module slots. Any combination of standard SFP modules are supported. SFP+ modules are not supported.
If you insert an SFP+ module in the 1-Gigabit network module, the SFP+ module does not operate, and the switch logs an error message.
See Figure 3-1.
C3850-NM-2-10G
This module has four slots that support the following combinations:
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Supported combinations of SFP and SFP+ modules:
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See Figure 3-2.
C3850-NM-4-10G
This module has four 10-Gigabit slots or four 1-Gigabit slots.
Note
See Figure 3-3.
The service module supports Net Flow and MACSec Uplink Encryption (switch- to-switch encryption between uplinks). For information on configuring the service module, refer to the Configuring the Network Services Module note.
C3850-NM-BLANK
This module has no uplink ports.
1 All network modules are hot-swappable.
For information about the network modules, see the "Installing a Network Module in the Switch" section. For cable specifications, see "Connector and Cable Specifications."
SFP and SFP+ Modules
The SFP and SFP+ modules provide copper or fiber-optic connections to other devices. These transceiver modules are field-replaceable, providing the uplink interfaces when installed in an SFP module slot. The SFP modules have LC connectors for fiber-optic connections or RJ-45 connectors for copper connections.
Use only Cisco SFP and SFP+ modules on the switch.
For information about SFP modules, see your SFP module documentation and the "Installing SFP and SFP+ Modules" section. For cable specifications, see "Connector and Cable Specifications."
The Catalyst 3850 switch supports the SFP module patch cable (CAB-SFP-50CM), a 0.5-meter, copper, passive cable with SFP module connectors at each end. This cable is only used with 1-Gigabit Ethernet SFP ports to connect two Catalyst 3850 switches in a cascaded configuration.
LEDs
You can use the switch LEDs to monitor switch activity and its performance. Figure 1-4 shows the switch LEDs and the Mode button that you use to select a port mode.
Figure 1-4 Switch Front Panel LEDs
STAT (status)
CONSOLE (USB mini-Type B (console) port
DUPLX (duplex)
SYST (system)
SPEED
ACTV (active)
STACK
XPS1 (Expandable power system)
PoE2
S-PWR (StackPower)
1 The XPS 2200 is not supported in this release.
2 Only switches with PoE+ ports.
SYST LED
For information on the SYST LED colors during POST, see the "Diagnosing Problems" section.
XPS LED
Note
For information about the XPS 2200, see the Cisco eXpandable Power System 2200 Hardware Installation Guide on Cisco.com:
http://www.cisco.com/go/xps2200_hw
Port LEDs and Modes
Each Ethernet port, 1-Gigabit Ethernet module slot, and 10-Gigabit Ethernet module slot has a port LED. These port LEDs, as a group or individually, display information about the switch and about the individual ports. The port mode determines the type of information shown by the port LEDs. Table 1-7 lists the mode LEDs and their associated port modes and meanings.
To select or change a mode, press the Mode button until the desired mode is highlighted. When you change port modes, the meanings of the port LED colors also change. Table 1-8 explains how to interpret the port LED colors in different port modes.
When you press the Mode button on any switch in the switch stack, all the stack switches change to show the same selected mode. For example, if you press the Mode button on the active switch to show the SPEED LED, all the other switches in the stack also show the SPEED LED.
Table 1-7 Port Mode LEDs
STAT
Port status
The port status. This is the default mode.
SPEED
Port speed
The port operating speed: 10, 100, or 1000 Mb/s.
DUPLX
Port duplex mode
The port duplex mode: full duplex or half duplex.
ACTV
Active
The active switch status.
STACK
Stack member status
StackWise port status
The stack member status.
The StackWise port status. See the "STACK LED" section.
PoE1
PoE+ port power
The PoE+ port status.
1 Only switches with PoE+ ports.
USB Console LED
The USB console LED (Figure 1-4) shows whether there is an active USB connection to the port.
Table 1-9 USB Console Port LED
Off
USB console is disabled.
Green
USB console is enabled.
S-PWR LED
ACTV LED
STACK LED
The STACK LED shows the sequence of member switches in a stack. Up to four switches can be members of a stack. The first four port LEDs show the member number of a switch in a stack. Figure 1-5 shows the LEDs on the first switch, which is stack member number 1. For example, if you press the Mode button and select Stack, the LED for port 1 blinks green. The LEDs for ports 2 and 3 are solid green, as these represent the member numbers of other switches in the stack. The other port LEDs are off because there are no more members in the stack.
Figure 1-5 STACK LED
When you select the STACK LED mode, the representative STACK LEDs are green when the StackWise ports are up, and the representative STACK LEDs are amber when the ports are down.
PoE+ LED
If the PoE mode is not selected on a switch with PoE+ ports, the PoE+ LED still shows detected PoE+ problems.
NETWORK MODULE LEDs
Figure 1-6 NETWORK MODULE LEDs
Rear Panel
The switch rear panel includes StackWise connectors, StackPower connectors, ports, fan modules, and power supply modules. See Figure 1-7.
Figure 1-7 Catalyst 3850 Switch Rear Panel
RJ-45 Console Port LED
Table 1-14 RJ-45 Console Port LED
Off
RJ-45 console is disabled. USB console is active.
Green
RJ-45 console is enabled. USB console is disabled.
StackWise Ports
The Catalyst 3850 switch ships with a 0.5-meter StackWise cable that you can use to connect the StackWise ports.
Caution
You can order these StackWise cables (nonhalogen) from your Cisco sales representative:
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Power Supply Modules
The 24- and 48-port switches are powered through one or two internal power supply modules.
Supported power supply modules:
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The switch has two internal power supply module slots. You can use two AC modules, two DC modules, a mixed configuration of one AC and one DC power supply module, or one power supply module and a blank module.
The switch can operate with either one or two active power supply modules or with power supplied by a stack. A Catalyst 3850 switch that is in a StackPower stack can operate with power supplied by other switches in the stack.
Table 1-1 show the default power supply modules that ship with each switch model. All power supply modules (except the blank modules) have internal fans. All switches ship with a blank power supply module in the second power supply slot.
Caution
The 350-W and 715-W AC power supply modules are autoranging units that support input voltages between 100 and 240 VAC. The 1100-W power supply module is an autoranging unit that supports input voltages between 115 and 240 VAC. The 440-W DC power supply module has dual input feeds (A and B) and supports input voltages between 36 and 72 VDC. The output voltage range is 51-57 V.
Each AC power supply module has a power cord for connection to an AC power outlet. The 1100-W and 715-W modules use a 16-AWG cord (only North America). All other modules use an 18-AWG cord. The DC-power supply module must be wired to a DC-power source.
Table 1-15, Table 1-16, and Table 1-17 shows the PoE available and PoE requirements for Catalyst 3850 switches.
Table 1-16 Available PoE with DC Power Supply
24-port PoE switch
1
220 W
2
660 W
48-port PoE switch
1
185 W
2
625 W
Table 1-17 Switch Power Supply Requirements for PoE and PoE+
PoE (up to 15.4 per port)
(1) 715-W
These are the combinations of power supplies:
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PoE+ (up to 30 W per ports
These are the combinations of power supplies:
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These are the combinations of power supplies:
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1 A 48-port switch with one 715-W power supply provides up to 8.7 W of PoE to all ports.
The power supply modules have two status LEDs.
For information about replacing a power supply module, wiring a DC power supply module, and module specifications, see Chapter 4 "Power Supply Installation," and "Technical Specifications."
Fan Modules
The switch has three internal hot-swappable 12-V fan modules. The air circulation system consists of the fan modules and the power supply modules. The airflow patterns vary depending on the power supply configuration.
Figure 1-8 shows the airflow patterns for the 24- and 48-port switches. The blue arrow shows cool air flow, and the red arrow shows warm air flow. When the fan modules are operating properly, a green LED is on at the top left corner of the fan assembly (viewed from the rear). If the fan fails, the LED turns to amber. The switch can operate with two operational fans, but the failed fan should be replaced as soon as possible to avoid a service interruption due to a second fan fault.
Note
Figure 1-8 24- and 48-Port Switch Airflow Patterns
For information about installing a fan module and fan specifications, see Chapter 5 "Installing the Fan," and "Technical Specifications."
StackPower Connector
The Catalyst 3850 switches have a StackPower connector for use with Cisco StackPower cables to configure a switch power stack that includes up to four switches. A switch power stack can be configured in redundant or power-sharing mode.
You can order these StackPower cables from your Cisco sales representative:
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For details about connecting StackPower cables and StackPower guidelines, see the "Planning a StackPower Stack" section.
Management Ports
Ethernet Management Port
You can connect the switch to a host such as a Windows workstation or a terminal server through the 10/100/1000 Ethernet management port or one of the console ports (see Figure 1-7). The 10/100/1000 Ethernet management port is a VPN routing/forwarding (VRF) interface and uses a RJ-45 crossover or straight-through cable.
Table 1-20 shows the Ethernet management port LED colors and their meanings.
Table 1-20 Ethernet Management Port LED
Green
Link up but no activity.
Blinking green
Link up and activity.
Off
Link down.
RJ-45 Console Port
The RJ-45 console port connection uses the supplied RJ-45-to-DB-9 female cable.
Table 1-21 shows the RJ-45 console port LED colors and their meanings.
Table 1-21 RJ-45 Console LEDs
Green
RJ-45 console port is active.
Off
The port is not active.
Management Options
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Cisco Network Assistant is a PC-based network management GUI application for LANs. You can use the GUI to configure and manage switch clusters or standalone switches. Cisco Network Assistant is available at no cost and can be downloaded from this URL:
http://www.cisco.com/pcgi-bin/tablebuild.pl/NetworkAssistant
For information on starting the Network Assistant application, see the Getting Started with Cisco Network Assistant guide on Cisco.com.
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You can configure and monitor the switch and switch cluster members from the CLI. You can access the CLI by connecting your management station directly to the switch console port or by using Telnet from a remote management station. See the switch command reference on Cisco.com for more information.
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Cisco Prime Infrastructure combines the wireless functionality of Cisco Prime Network Control System (NCS) and the wired functionality of Cisco Prime LAN Management Solution (LMS), with application performance monitoring and troubleshooting capabilities of Cisco Prime Assurance Manager. For more information, see the Cisco Prime Infrastructure documentation on Cisco.com.
http://www.cisco.com/en/US/products/ps12239/index.html
Network Configurations
See the switch software configuration guide on Cisco.com for network configuration concepts and examples of using the switch to create dedicated network segments and interconnecting the segments through Gigabit Ethernet connections.
