Cisco Catalyst WS-C3850-24T-L Operating and safety instructions

Product Overview
The Catalyst 3850 family of 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.
This chapter contains these topics:
•Switch Models, page 1
•Front Panel, page 5
•Rear Panel, page 23
•Management Options, page 32
Switch Models
Table 1: Catalyst 3850 Switch Models and Descriptions
Description
Supported
Software
Image
Switch Model
Stackable 24 10/100/1000 Ethernet ports, 1 network module
slot1, 350 W power supply
LAN BaseWS-C3850-24T-L
Stackable 48 10/100/1000 Ethernet ports, 1 network module
slot, 350 W power supply
LAN BaseWS-C3850-48T-L
Stackable 24 10/100/1000 PoE+2ports, 1 network module
slot, 715 W power supply
LAN BaseWS-C3850-24P-L
Stackable 48 10/100/1000 PoE+ ports, 1 network module
slot, 715 W power supply
LAN BaseWS-C3850-48P-L
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Description
Supported
Software
Image
Switch Model
Stackable 48 10/100/1000 PoE+ ports, 1 network module
slot, 1100 W power supply
LAN BaseWS-C3850-48F-L
Stackable 24 10/100/1000 Cisco UPOE3ports, 1 network
module slot, 1100 W power supply
LAN BaseWS-C3850-24U-L
Stackable 48 10/100/1000 Cisco UPOE ports, 1 network
module slot, 1100 W power supply
LAN BaseWS-C3850-48U-L
Stackable 12 100M/1G/2.5G/5G/10G and 36 1G UPoE ports,
1 network module slot, 1100 W power supply
LAN BaseWS-C3850-12X48U-L
Stackable 24 100M/1G/2.5G/5G/10G UPoE ports, 1 network
module slot, 1100-W power supply
LAN BaseWS-C3850-24XU-L
Stackable 24 10/100/1000 Ethernet ports, 1 network module
slot, 350 W power supply
IP BaseWS-C3850-24T-S
Stackable 48 10/100/1000 Ethernet ports, 1 network module
slot, 350 W power supply
IP BaseWS-C3850-48T-S
Stackable 24 10/100/1000 PoE+ ports, 1 network module
slot, 715 W power supply
IP BaseWS-C3850-24P-S
Stackable 48 10/100/1000 PoE+ ports, 1 network module
slot, 715 W power supply
IP BaseWS-C3850-48P-S
Stackable 48 10/100/1000 PoE+ ports, 1 network module
slot, 1100 W power supply
IP BaseWS-C3850-48F-S
Stackable 24 10/100/1000 Cisco UPOE ports, 1 network
module slot, 1100 W power supply
IP BaseWS-C3850-24U-S
Stackable 48 10/100/1000 Cisco UPOE ports, 1 network
module slot, 1100 W power supply
IP BaseWS-C3850-48U-S
Catalyst 3850 24-port PoE IP Base with 5 access points
license
IP BaseWS-C3850-24PW-S
Catalyst 3850 48-port PoE IP Base with 5 access points
license
IP BaseWS-C3850-48PW-S
Stackable 12 SFP module slots, 1 network module slot, 350
W power supply
IP BaseWS-C3850-12S-S
Stackable 24 SFP module slots, 1 network module slot, 350
W power supply
IP BaseWS-C3850-24S-S
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Product Overview
Switch Models

Description
Supported
Software
Image
Switch Model
Catalyst 3850 12-port SFP+ transceiver, 1 network module
slot, support for up to 10 G SFP+, 350 W power supply
IP BaseWS-C3850-12XS-S
Catalyst 3850 16-port SFP+ transceiver, 1 network module
slot, support for up to 10 G SFP+, 350 W power supply.
16 ports are available when the C3850-NM-4-10G network
module is plugged into the WS-C3850-12XS-S switch.
IP BaseWS-C3850-16XS-S
Catalyst 3850 24-port SFP+ transceiver, 1 network module
slot, support for up to 10 G SFP+, 715 W power supply.
IP BaseWS-C3850-24XS-S
Catalyst 3850 32-port SFP+ transceiver, 1 network module
slot, support for up to 10 G SFP+, 715 W power supply.
32 ports are available when the C3850-NM-8-10G network
module is plugged into the WS-C3850-24XS-S switch.
IP BaseWS-C3850-32XS-S
Catalyst 3850 switch with SFP+ transceivers, 48 ports that
support up to 10 G, and 4 QSFP ports that support up to 40
G. 750 W power supply.4
The airflow direction for this switch is from the front panel
to the rear panel.
IP BaseWS-C3850-48XS-S
Catalyst 3850 switch with SFP+ transceivers, 48 ports that
support up to 10 G, and 4 QSFP ports that support up to 40
G. 750 W power supply.
The airflow direction for this switch is from the rear panel to
the front panel.
IP BaseWS-C3850-48XS-F-S
Stackable 12 100M/1G/2.5G/5G/10G and 36 1 G UPoE ports,
1 network module slot, 1100 W power supply
IP BaseWS-C3850-12X48U-S
Stackable 12 100M/1G/2.5G/5G/10G and 36 1 G UPoE ports,
1 network module slot, 1100 W power supply
IP BaseWS-C3850-12X48UW-S
Stackable 24 100M/1G/2.5G/5G/10G UPoE ports, 1 network
module slot, 1100-W power supply
IP BaseWS-C3850-24XU-S
Stackable 24 100M/1G/2.5G/5G/10G UPoE ports, 1 network
module slot, 1100-W power supply
IP BaseWS-C3850-24XUW-S
Stackable 24 10/100/1000 Ethernet ports, 1 network module
slot, 350 W power supply
IP ServicesWS-C3850-24T-E
Stackable 48 10/100/1000 Ethernet ports, 1 network module
slot, 350 W power supply
IP ServicesWS-C3850-48T-E
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Product Overview
Switch Models

Description
Supported
Software
Image
Switch Model
Stackable 24 10/100/1000 PoE+ ports, 1 network module
slot, 715 W power supply
IP ServicesWS-C3850-24P-E
Stackable 48 10/100/1000 PoE+ ports, 1 network module
slot, 715 W power supply
IP ServicesWS-C3850-48P-E
Stackable 48 10/100/1000 PoE+ ports, 1 network module
slot, 1100 W power supply
IP ServicesWS-C3850-48F-E
Stackable 24 10/100/1000 Cisco UPOE ports, 1 network
module slot, 1100 W power supply
IP ServicesWS-C3850-24U-E
Stackable 48 10/100/1000 Cisco UPOE ports, 1 network
module slot, 1100 W power supply
IP ServicesWS-C3850-48U-E
Stackable 12 SFP module slots, 1 network module slot, 350
W power supply
IP ServicesWS-C3850-12S-E
Stackable 24 SFP module slots, 1 network module slot, 350
W power supply
IP ServicesWS-C3850-24S-E
Catalyst 3850 12-port SFP+ transceiver, 1 network module
slot, support for up to 10 G SFP+, 350 -W power supply.
IP ServicesWS-C3850-12XS-E
Catalyst 3850 16-port SFP+ transceiver, 1 network module
slot, support for up to 10 G SFP+, 350 W power supply.
16 ports are available when the C3850-NM-4-10G network
module is plugged into the WS-C3850-12XS-E switch.
IP ServicesWS-C3850-16XS-E
Catalyst 3850 24-port SFP+ transceiver, 1 network module
slot, support for up to 10 G SFP+, 715 W power supply.
IP ServicesWS-C3850-24XS-E
Catalyst 3850 32-port SFP+ transceiver, 1 network module
slot, support for up to 10 G SFP+, 715 W power supply.
32 ports are available when the C3850-NM-8-10G network
module is plugged into the WS-C3850-24XS-E switch.
IP ServicesWS-C3850-32XS-E
Catalyst 3850 switch with SFP+ transceivers, 48 ports that
support up to 10 G, and 4 QSFP ports that support up to 40
G. 750 W power supply.
The airflow direction for this switch is from the front panel
to the rear panel.
IP ServicesWS-C3850-48XS-E
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Product Overview
Switch Models

Description
Supported
Software
Image
Switch Model
Catalyst 3850 switch with SFP+ transceivers, 48 ports that
support up to 10 G, and 4 QSFP ports that support up to 40
G. 750 W power supply.
The airflow direction for this switch is from the rear panel to
the front panel.
IP ServicesWS-C3850-48XS-F-E
Stackable 12 100M/1G/2.5G/5G/10G and 36 1 G UPoE ports,
1 network module slot, 1100 W power supply
IP ServicesWS-C3850-12X48U-E
Stackable 24 100M/1G/2.5G/5G/10G UPoE ports, 1 network
module slot, 1100-W power supply
IP ServicesWS-C3850-24XU-E
1For supported network modules, see Network Modules, on page 10 .
2PoE+ = Power over Ethernet plus (provides up to 30 W per port).
3UPOE = Universal Power Over Ethernet (provides up to 60 W Cisco UPOE per port)
4The WS-C3850-48XS switches do not support StackWise-480
Front Panel
This section describes the front panel components:
•24 or 48 downlink ports of one of these types:
◦10/100/1000
◦10/100/1000 PoE+
◦10/100/1000 Cisco UPoE
◦10 G SFP+
•12 or 24 SFP or SFP+ module downlink slots
•Uplink network modules slot
•USB Type A connector
•USB mini-Type B (console) port
•LEDs
•Mode button
All of the switches have similar components. See the following illustrations for examples.
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Product Overview
Front Panel

The Catalyst 3850 switches might have slight cosmetic differences on the bezels.Note
Figure 1: WS-C3850-48P-L Switch Front Panel
USB mini-Type B (console) port4Mode button1
10/100/1000 PoE+ ports5Status LEDs2
Network module6USB Type A storage port3
Figure 2: WS-C3850-24S Switch Front Panel
The WS-C3850-12S switches have similar front panels.Note
USB Type A storage port5UID button1
SFP module slots (downlink)6Mode button2
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Product Overview
Front Panel

Network module7Status LEDs3
USB mini-Type B (console) port4
Figure 3: WS-C3850-24XS-E Switch Front Panel
The WS-C3850-24XS-E switches have the following components.Note
USB mini-Type B (console) port4Mode button1
10 G SFP+ ports5Status LEDs2
Network module6USB Type A storage port3
10/100/1000 Ports
The 10/100/1000 ports use RJ-45 connectors with Ethernet pinouts. The maximum cable length is 328 feet
(100 meters). The 10BASE-T, 100BASE-TX, 1000BASE-T traffic requires Category 5 or Category 5e twisted
pair (UTP) cable. The 10BASE-T traffic can use Category 3 or Category 4 UTP cable.
PoE, PoE+, and Cisco UPoE Ports
The PoE+ and Cisco Universal Power Over Ethernet (Cisco UPoE) ports use the same connectors as described
in 10/100/1000 Port Connections. They provide:
•PoE+ ports: Support for IEEE 802.3af-compliant powered devices (up to 15.4 W PoE per port) and
support for IEEE 802.3at-compliant powered devices (up to 30 W PoE+ per port). The maximum total
PoE power in a 1RU switch is 1800 W.
•Support for Cisco-enhanced PoE.
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Product Overview
10/100/1000 Ports

•Support for prestandard Cisco powered devices.
•Configuration for StackPower. When the switch internal power supply module(s) cannot support the
total load, StackPower configurations allow the switch to leverage power available from other switches.
•Configurable support for Cisco intelligent power management, including enhanced power negotiation,
power reservation, and per-port power policing.
Depending on the installed power supply modules, each port can deliver up to 60 W of Cisco UPOE. See the
Power Supply Modules, on page 26 for the power supply matrix that defines the available PoE, PoE+, and
Cisco UPOE power per port. The output of the PoE+ circuit has been evaluated as a Limited Power Source
(LPS) per IEC 60950-1.
Restrictions for the WS-C3850-12X48U-L, WS-C3850-12X48U-S and WS-C3850-12X48U-E switch
models:
Note
•A maximum of 28 ports are available for UPoE connections. This is because some power from the
power supplies is diverted to the switch, and only the remaining power is transmitted to the ports.
SFP and QSFP Module Slots
The uplink and downlink ports for the Catalyst WS-C3850 switch models are as follows.
•The downlink ports on the Catalyst WS-C3850-12S and WS-C3850-24S switch models support standard
SFP modules.
•The downlink ports on the Catalyst WS-C3850-12XS and WS-C3850-24XS switch models support
standard SFP+ modules.
•The 10G downlink ports on the Catalyst WS-C3850-48XS-S, WS-C3850-48XS-F-S, WS-C3850-48XS-E
and WS-C3850-48XS-F-E switch models support standard SFP+ modules.
•The 40G downlink ports on the Catalyst WS-C3850-48XS-S, WS-C3850-48XS-F-S, WS-C3850-48XS-E
and WS-C3850-48XS-F-E switch models support standard QSFP modules.
For supported SFP modules, refer to the Cisco Transceiver Modules Compatibility Information at http://
www.cisco.com/en/US/products/hw/modules/ps5455/products_device_support_tables_list.html
For information about the (uplink) SFP module slots on the network modules, see Network Modules, on
page 10.
Note
Management Ports
The management ports connect the switch to a PC running Microsoft Windows or to a terminal server.
•Ethernet management port. See Ethernet Management Port, on page 31.
•RJ-45 console port (EIA/TIA-232). See RJ-45 Console Port, on page 32.
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Product Overview
SFP and QSFP Module Slots

•USB mini-Type B console port (5-pin connector).
The 10/100/1000 Ethernet management port connection uses a standard RJ-45 crossover or straight-through
cable. The RJ-45 console port connection uses the supplied RJ-45-to-DB-9 female cable. 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.
If you use the USB mini-Type B console port, the Cisco Windows USB device driver must be installed on
any PC connected to the console port (for operation with Microsoft Windows). Mac OS X or Linux do not
require special drivers.
The 4-pin mini-Type B connector resembles the 5-pin mini-Type B connectors. They are not compatible. Use
only the 5-pin mini-Type B.
This illustration shows a 5-pin mini-Type B USB port.
Figure 4: USB Mini-Type B Port
With the Cisco Windows USB device driver, you can connect and disconnect the USB cable from the console
port without affecting Windows HyperTerminal operations.
The console output always goes to both the RJ-45 and the USB console connectors, but the console input is
active on only one of the console connectors at any one time. The USB console takes precedence over the
RJ-45 console. When a cable is connected into the USB console port, the RJ-45 console port becomes inactive.
Conversely, when the USB cable is disconnected from the USB console port, the RJ-45 port becomes active.
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.
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 software guide.
USB Type A Port
The USB Type A port provides access to external USB flash devices (also known as thumb drives or USB
keys) and to specific Cisco USB Bluetooth devices.
The port supports Cisco USB flash drives with capacities from 128 MB to 8 GB (USB devices with port
densities of 128 MB, 256 MB, 1 GB, 4 GB, and 8 GB are supported). When combined with stacking, you can
upgrade other switches in the stack from an USB key inserted in any switch within the stack. 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.
It provides you with the ability to automatically upgrade the internal flash with the USB drive's configuration
and image for emergency switch recovery using USB auto-upgrade. This feature checks the internal flash for
a bootable image and configuration and if either image or the configuration is not available, then the USB
drive is checked for boot images and configuration. If the boot image and configuration are available, these
are copied to flash for the reboot.
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Product Overview
USB Type A Port

The port supports Cisco USB Bluetooth devices. The USB Bluetooth device acts as a Bluetooth host and
serves as either a serial port or a management port connection. You can pair it with your Bluetooth smart
phone, laptop, or tablet. If you configure the serial profile on the Bluetooth device, the switch turns the USB
port into a serial port. If you configure the Personal Area Network (PAN) profile on the Bluetooth device, the
switch turns the USB port into a management interface.
Figure 5: Cisco USB Bluetooth
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 2: Network Modules
DescriptionNetwork Module5
This module has four 1 G 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 G network module, the SFP+ module does
not operate, and the switch logs an error message.
This is supported on the following switch
models:
Note
•WS-C3850-24T/P/U
•WS-C3850-48T/F/P/U
•WS-C3850-12X48U
•WS-C3850-24XU
•WS-C3850-12S
•WS-C3850-24S
C3850-NM-4-1G
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Product Overview
Network Modules