Catalyst 3850 Switch Hardware Installation Guide
Product Overview
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Product Overview

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

Table 1 Catalyst 3850 Switch Models and Descriptions

Switch Model

Supported 
Software Image

Description

Catalyst 3850-24T-L

LAN Base

Stackable 24 10/100/1000 Ethernet ports, 1 network module slot, 350-W power supply

Catalyst 3850-48T-L

LAN Base

Stackable 48 10/100/1000 Ethernet ports, 1 network module slot, 350-W power supply

Catalyst 3850-24P-L

LAN Base

Stackable 24 10/100/1000 PoE+2 ports, 1 network module slot, 715-W power supply

Catalyst 3850-48P-L

LAN Base

Stackable 48 10/100/1000 PoE+ ports, 1 network module slot, 715-W power supply

Catalyst 3850-48F-L

LAN Base

Stackable 48 10/100/1000 PoE+ ports, 1 network module slot, 1100-W power supply

Catalyst 3850-24U-L

LAN Base

Stackable 24 10/100/1000 Cisco UPOE3 ports, 1 network module slot, 1100-W power supply

Catalyst 3850-48U-L

LAN Base

Stackable 48 10/100/1000 Cisco UPOE ports, 1 network module slot, 1100-W power supply

Catalyst 3850-24T-S

IP Base

Stackable 24 10/100/1000 Ethernet ports, 1 network module slot, 350-W power supply

Catalyst 3850-48T-S

IP Base

Stackable 48 10/100/1000 Ethernet ports, 1 network module slot, 350-W power supply

Catalyst 3850-24P-S

IP Base

Stackable 24 10/100/1000 PoE+ ports, 1 network module slot, 715-W power supply

Catalyst 3850-48P-S

IP Base

Stackable 48 10/100/1000 PoE+ ports, 1 network module slot, 715-W power supply

Catalyst 3850-48F-S

IP Base

Stackable 48 10/100/1000 PoE+ ports, 1 network module slot, 1100-W power supply

Catalyst 3850-24U-S

IP Base

Stackable 24 10/100/1000 Cisco UPOE ports, 1 network module slot, 1100-W power supply

Catalyst 3850-48U-S

IP Base

Stackable 48 10/100/1000 Cisco UPOE ports, 1 network module slot, 1100-W power supply

Catalyst 3850-24PW-S

IP Base

Catalyst 3850 24-port PoE IP Base with 5 access points license

Catalyst 3850-48PW-S

IP Base

Catalyst 3850 48-port PoE IP Base with 5 access points license

Catalyst 3850-12S-S

IP Base

Stackable 12 SFP module slots, 1 network module slot, 350-W power supply

Catalyst 3850-24S-S

IP Base

Stackable 24 SFP module slots, 1 network module slot, 350-W power supply

Catalyst 3850-24T-E

IP Services

Stackable 24 10/100/1000 Ethernet ports, 1 network module slot, 350-W power supply

Catalyst 3850-48T-E

IP Services

Stackable 48 10/100/1000 Ethernet ports, 1 network module slot, 350-W power supply

Catalyst 3850-24P-E

IP Services

Stackable 24 10/100/1000 PoE+ ports, 1 network module slot, 715-W power supply

Catalyst 3850-48P-E

IP Services

Stackable 48 10/100/1000 PoE+ ports, 1 network module slot, 715-W power supply

Catalyst 3850-48F-E

IP Services

Stackable 48 10/100/1000 PoE+ ports, 1 network module slot, 1100-W power supply

Catalyst 3850-24U-E

IP Services

Stackable 24 10/100/1000 Cisco UPOE ports, 1 network module slot, 1100-W power supply

Catalyst 3850-48U-E

IP Services

Stackable 48 10/100/1000 Cisco UPOE ports, 1 network module slot, 1100-W power supply

Catalyst 3850-12S-E

IP Services

Stackable 12 SFP module slots, 1 network module slot, 350-W power supply

Catalyst 3850-24S-E

IP Services

Stackable 24 SFP module slots, 1 network module slot, 350-W power supply

1 For supported network modules, see Network Modules .
2 PoE+ = Power over Ethernet plus (provides up to 30 W per port).
3 UPOE = Universal Power Over Ethernet (provides up to 60 W Cisco UPOE per port)

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 ports
  • 12 or 24 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.


Note


The Catalyst 3850 switches might have slight cosmetic differences on the bezels.


Figure 1. Catalyst 3850-48P-L Switch Front Panel

1

Mode button

4

USB mini-Type B (console) port

2

Status LEDs

5

10/100/1000 PoE+ ports

3

USB Type A storage port

6

Network module

Figure 2. Catalyst 3850-24S Switch Front Panel


Note


The Catalyst 3850-12S switches have similar front panels.


1

UID button

5

USB Type A storage port

2

Mode button

6

SFP module slots (downlink)

3

Status LEDs

7

Network module

4

USB mini-Type B (console) port

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 100BASE-TX 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.

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.
  • 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 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.

SFP Module Slots

The downlink SFP module slots on the Catalyst 3850-12S and 3850-24S switch support any combination of standard SFP modules. SFP+ modules are not supported.

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


Note


For information about the (uplink) SFP module slots on the network modules, see Network Modules.

Management Ports

The management ports connect the switch to a PC running Microsoft Windows or to a terminal server.

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.

Figure 3. USB Mini-Type B Port. This illustration shows a 5-pin mini-Type B USB 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).

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.

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
Network Module4 Description

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.

C3850-NM-2-10G

This module has four slots:

Two slots (left side) support only 1-Gigabit SFP modules and two slots (right side) support either 1-Gigabit SFP or 10-Gigabit SFP modules.

C3850-NM-4-10G

This module has four 10-Gigabit slots or four 1-Gigabit slots.

Note   

This module is supported only on the 48-port switches.

C3850-NM-BLANK

This module has no uplink ports.

4 All network modules are hot-swappable.

For information about the network modules, see the Installing Network Modules. For cable specifications, see Cables and Adapters.

SFP and SFP+ Modules

The SFP and SFP+ modules provide copper or fiber-optic connections to other devices. These transceiver modules are field-replaceable, and they provide the uplink interfaces (expect in the fixed SFP slots in the Catalyst 3850-12S and 3850-24S) when installed in an SFP module slot. The SFP modules have LC connectors for fiber-optic connections or RJ-45 connectors for copper connections.


Note


The (downlink) SFP module slots on the Catalyst 3850-12S and 3850-24S switch front panel support any combination of standard SFP modules. SFP+ modules are not supported.

Use only Cisco SFP and SFP+ modules on the switch. For the latest information about supported SFP and 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 SFP modules, see the SFP module documentation and Installing SFP and SFP+ Modules.

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.


Note


Catalyst 3850 switches might have slight cosmetic differences on the bezels.


Figure 4. Switch Front Panel LEDs . This figure shows the switch LEDs and the Mode button that you use to select a port mode.

1

STAT (status)

6

USB mini-Type B console port LED

2

DUPLX (duplex)

7

SYST (system)

3

SPEED

8

ACTV (active)

4

STACK

9

XPS 56

5

PoE

10

S-PWR (StackPower)

5 XPS = expandable power system.
6 The XPS 2200 is not supported in this release.
7 Only on switch models that support PoE.
Figure 5. Switch Front Panel LEDs for the Catalyst 3850-12S and Catalyst 3850-24S Switches

1

UID (blue beacon)

6

USB mini-Type B console port LED

2

STAT (status)

7

SYST (system)

3

DUPLX (duplex)

8

ACTV (active)

4

SPEED

9

XPS 89

5

STACK

10

S-PWR (StackPower)

8 XPS = expandable power system.
9 The XPS 2200 is not supported in this release.

SYST LED

Table 3 SYST LED

Color

System Status

Off

System is not powered on.

Green

System is operating normally.

Blinking green

POST in progress.

Amber

System is receiving power but is not functioning properly.

Blinking amber

There is a fault with one of the following:

  • Network module (non traffic-related)
  • Power supply
  • Fan module

XPS LED


Note


The XPS 2200 is not supported in this release.


Table 4 XPS LED
Color Description

Off

XPS cable is not installed.

Switch is in StackPower mode.

Green

XPS is connected and ready to provide back-up power.

Blinking green

XPS is connected but is unavailable because it is providing power to another device (redundancy has been allocated to a neighboring device).

Amber

The XPS is in standby mode or in a fault condition. See the XPS 2200 documentation for information about the standby mode and fault conditions.

Blinking amber

The power supply in a switch has failed, and the XPS is providing power to that switch (redundancy has been allocated to this device).

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.

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.

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 5  Port Mode LEDs
Mode LED Port Mode Description

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

Stack member status.

The StackWise port status. See STACK LED.

PoE10

The PoE+ port status.

The PoE+ port status.

10 Only switches with PoE+ ports.
Table 6  Meaning of Switch LED Colors in Different Modes
Port Mode Port LED Color Meaning

STAT (port status)

Off

No link, or port was administratively shut down.

Green

Link present, no activity.

Blinking green

Activity. Port is sending or receiving data.

Alternating green-amber

Link fault. Error frames can affect connectivity, and errors such as excessive collisions, CRC errors, and alignment and jabber errors are monitored for a link-fault indication.

Amber

Port is blocked by Spanning Tree Protocol (STP) and is not forwarding data.

After a port is reconfigured, the port LED can be amber for up to 30 seconds as STP checks the switch for possible loops.

SPEED

10/100/1000/SFP ports

Off

Port is operating at 10 Mb/s.

Green

Port is operating at 100 Mb/s.

Single green flash (on for 100 ms, off for 1900 ms)

Port is operating at 1000 Mb/s.

Network module slots

Off

Port is not operating.

Blinking green

Port is operating at up to 10 Gb/s.

DUPLX (duplex)

Off

Port is operating in half duplex.

Green

Port is operating in full duplex.

ACTV (data active switch)

Off

The switch is not the active switch.
Note    For a standalone switch, this LED is off.

Green

The switch is the active switch.

Amber

Error during active switch election.

Blinking green

Switch is a standby member of a data stack and assumes active responsibilities if the current active switch fails.

STACK (stack member)

Off

No stack member corresponding to that member number.

Blinking green

Stack member number.

Green

Member numbers of other stack member switches.

PoE+11

Off

PoE+ is off.

If the powered device is receiving power from an AC power source, the port LED is off even if the device is connected to the switch port.

Green

PoE+ is on. The port LED is green when the switch port is providing power.

Alternating green-amber

PoE+ is denied because providing power to the powered device will exceed the switch power capacity.

Blinking amber

PoE+ is off due to a fault or because it has exceeded a limit set in the switch software.

Caution   

PoE+ faults occur when noncompliant cabling or powered devices are connected to a PoE+ port. Use only standard-compliant cabling to connect Cisco prestandard IP Phones and wireless access points or IEEE 802.3af-compliant devices to PoE+ ports. You must remove from the network any cable or device that causes a PoE+ fault.

Amber

PoE+ for the port has been disabled.

Note    PoE+ is enabled by default.
11 Only switches with PoE or PoE+ ports.

USB Console LED

The USB console LED shows whether there is an active USB connection to the port.

Table 7 USB Console LED

LED

Color

Description

USB console port

Green

USB console port is active.

Off

The USB is disabled.

S-PWR LED

Table 8 S-PWR LED
Color Description

Off

StackPower cable is not connected, or the switch is in standalone mode.

Green

Each StackPower port is connected to another switch.

Blinking green

This appears on the switch in a StackPower ring configuration that detects an open ring or has only one StackPower cable connected.

Amber

There is a fault: load shedding is occurring, a StackPower cable is defective, or an administrative action is required. See the switch software configuration guide for information about configuring StackPower.

Blinking amber

The StackPower budget is not sufficient to meet current power demands.

ACTV LED

Table 9 ACTV LED
Color Description

Off

Switch is not the active switch.

Green

Switch is the active switch or a standalone switch.

Slow blinking green

Switch is in stack standby mode.

Amber

An error occurred when the switch was selecting the active switch, or another type of stack error occurred.

STACK LED

The STACK LED shows the sequence of member switches in a stack. Up to nine switches can be members of a stack. The first nine port LEDs show the member number of a switch in a stack.

Figure 6. STACK LED. This figure 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.

1

Stack member 1

4

LED blinks green to show that this is switch 1 in the stack.

2

Stack member 2

5

LED is solid green to show that switch 2 is a stack member.

3

Stack member 3

6

LED is solid green to show that switch 3 is a stack member.

PoE LED

The PoE LED indicates the status of the PoE mode: either PoE, PoE+, or Cisco UPOE.

Table 10 PoE LED
Color Description

Off

PoE mode is not selected. None of the 10/100/1000 ports have been denied power or are in a fault condition.

Green

PoE mode is selected, and the port LEDs show the PoE mode status.

Blinking amber

PoE mode is not selected. At least one of the 10/100/1000 ports has been denied power, or at least one of the 10/100/1000 ports has a PoE mode fault.

UID/Beacon LED

The UID and the Beacon LED can be turned on by the administrator to indicate that the switch needs attention. It helps the administrator identify the switch. The beacon can be turned on by either pressing the UID button on the switch front panel, or by using the CLI. There is a blue beacon on the front and rear panel of the switch. The blue beacon on the front panel is a button labeled UID, and on the back panel it is a LED labeled BEACON.

Table 11 UID/Beacon LED Indicator (Applies Only to the Catalyst 3850-12S and Catalyst 3850-24S Switches)

Color/State

Description

Solid blue

The operator has indicated that the system needs attention.

Network Module LEDs

Figure 7. Network Module LEDs

1

G1 LED

3

G3 LED

2

G2 LED

4

G4 LED

Color Network Module Link Status

Off

Link is off.

Green

Link is on; no activity.

Blinking green

Activity on a link; no faults.

Note   

The LED will blink green even when there is very little control traffic.

Blinking amber

Link is off due to a fault or because it has exceeded a limit set in the switch software.

Caution   

Link faults occur when noncompliant cabling is connected to an SFP or SFP+ port. Use only standard-compliant cabling to connect to Cisco SFP and SFP+ ports. You must remove from the network any cable or device that causes a link fault.

Amber

Link for the SFP or SFP+ has been disabled.

Rear Panel

The switch rear panel includes StackWise connectors, StackPower or XPS 2200 connectors, ports, fan modules, and power supply modules.

Figure 8. Catalyst 3850 Switch Rear Panel

1

Ground connector

6

StackWise port connector

2

CONSOLE (RJ-45 console port)

7

StackPower connector

3

MGMT (RJ-45 10/100/1000 management port)

8

AC OK (input) status LED

4

RESET button

9

PS OK (output) status LED

5

Fan module

10

Power supply modules (AC power supply modules shown)

Figure 9. Catalyst 3850-12S and 3850-24S Switches Switch Rear Panel

1

Ground connector

7

StackWise port connector

2

CONSOLE (RJ-45 console port)

8

StackPower connector

3

MGMT (RJ-45 10/100/1000 management port)

9

AC OK (input) status LED

4

RESET button

10

PS OK (output) status LED

5

BEACON LED

11

Power supply modules (AC power supply modules shown)

6

Fan module

RJ-45 Console Port LED

Table 12 RJ-45 Console Port LED
Color RJ-45 Console Port Status

Off

RJ-45 console is disabled. USB console is active.

Green

RJ-45 console is enabled. USB console is disabled.

StackWise Ports

StackWise ports are used to connect switches in StackWise stacking configurations. The Catalyst 3850 switch ships with a 0.5-meter StackWise cable that you can use to connect the StackWise ports. For more information on StackWise cables, see Connecting to the StackWise Ports.


Caution


Use only approved cables, and connect only to similar Cisco equipment. Equipment might be damaged if connected to nonapproved Cisco cables or equipment.


Power Supply Modules

The switches are powered through one or two internal power supply modules.

Supported power supply modules:

  • PWR-C1-350WAC
  • PWR-C1-715WAC
  • PWR-C1-1100WAC
  • PWR-C1-440WDC

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.

Switch Models shows 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


Do not operate the switch with one power supply module slot empty. For proper chassis cooling, both power supply module slots must be populated with either a power supply or a blank module.


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 to 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.

The following tables show the PoE available and PoE requirements for Catalyst 3850 PoE switch models.

Table 13  Available PoE with AC Power Supply
Models Default Power Supply Available PoE

12-port data switch

PWR-C1-350WAC

24-port data switch

48-port data switch

24-port PoE+ switch

PWR-C1-715WAC

435 W

48-port PoE+ switch

48-port full PoE+ switch

PWR-C1-1100WAC

800 W

24-port Cisco UPOE switch

48-port Cisco UPOE switch

Table 14  Available PoE with DC Power Supply
Models Number of Power Supplies Available PoE

24-port PoE+ switch

1

220 W

2

660 W

48-port PoE+ switch

1

185 W

2

625 W

24-port Cisco UPOE switch

1

220 W

2

660 W

48-port Cisco UPOE switch

1

185 W

2

625 W

Table 15  Switch Power Supply Requirements for PoE, PoE+, and Cisco UPOE
PoE Option 24-Port Switch 48-Port Switch12

PoE (up to 15.4 per port)

(1) 715 W

These are the combinations of power supplies:

  • (1) 1100 W
  • (1) 715 W + (1) 715 W

PoE+ (up to 30 W per ports)

These are the combinations of power supplies:

  • (1) 1100 W
  • (1) 715 W + (1) 715 W

These are the combinations of power supplies:

  • (1) 1100 W + (1) 715 W
  • (2) 1100 W

Cisco UPOE (up to 60 W per port)

(2) 1100 W

These are the combinations of power supplies:

  • (1) 1100 W + (1) 715 W
  • (2) 1100 W
Note    Up to 30 PoE ports can receive full Cisco UPOE.
12 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.

Table 16 Switch Power Supply Module LEDs

AC OK

DC OK

Description

PS OK

Description

Off

No AC input power.

No DC input power.

Off

Output is disabled, or input is outside operating range (AC LED is off).

Output is disabled, or input is outside operating range (DC LED is off).

Green

AC input power present.

DC input power present.

Green

Power output to switch active.

Red

Output has failed.

For information about replacing a power supply module, wiring a DC power supply module, and module specifications, see the "Power Supply Installation" and "Technical Specifications" chapters.

Fan Module

The switch has three internal hot-swappable 12-V fan modules (FAN-T1=). The air circulation system consists of the fan modules and the power supply modules. The airflow patterns vary depending on the power supply configuration.

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


Three fans are required for proper cooling.


Figure 10. 24- and 48-Port Switch Airflow Patterns. The following illustration shows the airflow patterns for the 24- and 48-port switches. The blue arrow shows cool airflow, and the red arrow shows warm airflow.



Figure 11. Airflow Patterns for the Catalyst 3850-24S-E and 3850-12S-E Switches

The blue arrow shows cool airflow, and the red arrow shows warm airflow.

For information about installing a fan module and fan specifications, see the "Technical Specifications" chapter.

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 nine 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:

  • CAB-SPWR-30CM (0.3-meter cable)
  • CAB-SPWR-150CM (1.5-meter cable)

For details about connecting StackPower cables and StackPower guidelines, see Planning a StackPower Stack.

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. The 10/100/1000 Ethernet management port is a VPN routing/forwarding (VRF) interface and uses a RJ-45 crossover or straight-through cable.

The following table shows the Ethernet management port LED colors and their meanings.

Table 17  Ethernet Management Port LED
Color Description

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.

The following table shows the RJ-45 console port LED colors and their meanings.

Table 18  RJ-45 Console LED
Color Description

Green

RJ-45 console port is active.

Off

The port is not active.

Management Options

  • Cisco Network Assistant 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
  • Cisco IOS CLI 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.
  • Cisco Prime Infrastructure 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