TP-Link JetStream T2600G-18TS User manual

Business Networking Solution
Installation Guide
JetStream Gigabit L2 Managed Switch
T2600G-18TS (TL-SG3216)
T2600G-28TS (TL-SG3424)
T2600G-52TS (TL-SG3452)
T2600G-28MPS (TL-SG3424P)

IAbout this Installation Guide
About this Installation Guide
This Installation Guide describes the hardware characteristics, installation methods and the points that should
be attended to during the installation. This Installation Guide is structured as follows:
Chapter 1 Introduction.
This chapter describes the external components of the switch.
Chapter 2 Installation.
This chapter illustrates how to install the switch.
Chapter 3 Lightning Protection.
This chapter illustrates how to prevent lightning damage.
Chapter 4 Connection.
This chapter illustrates how to do the physical connection of the switch.
Chapter 5 Configuration
This chapter instructs you to configure the switch via Web Interface and CLI commands.
Appendix A Troubleshooting.
Appendix B Hardware Specifications.
Audience
This Installation Guide is for:
Network Engineer Network Administrator
Conventions
• Some models featured in this guide may be unavailable in your country or region. For local sales information,
visit http://www.tp-link.com.
• The figures in Chapter 2 to Chapter 5 are for demonstration purposes only. Your switch may differ in
appearance from that depicted.
• This Guide uses the specific formats to highlight special messages. The following table lists the notice icons
that are used throughout this guide.
Remind to be careful. A caution indicates a potential which may result in device damage.
Remind to take notice. The note contains the helpful information for a better use of the product.
Related Document
The User Guide and CLI Reference Guide of the product are provided on the resource CD. To obtain the latest
product information, please visit the official website:
http://www.tp-link.com

JetStream Gigabit L2 Managed Switch
II Contents
Contents
Chapter 1 Introduction ——————————— 01
1.1 Product Overview.................................................01
1.2 Appearance............................................................01
Chapter 2 Installation ——————————— 07
2.1 Package Contents ...............................................07
2.2 Safety Precautions ..............................................07
2.3 Installation Tools...................................................09
2.4 Product Installation .............................................09
Chapter 3 Lightning Protection ——————— 11
3.1 Cabling Reasonably.............................................11
3.2 Connect to Ground .............................................13
Chapter 4 Connection ——————————— 16
4.1 Ethernet Port..........................................................16
4.2 SFP Port...................................................................16
4.3 Console Port ..........................................................16
4.4 Verify Installation..................................................17
4.5 Power On .................................................................18
4.6 Initialization.............................................................18
Chapter 5 Conguration —————————— 19
5.1 Congure the Switch via GUI ...........................19
5.2 Congure the Switch Using CLI......................20
Appendix A Troubleshooting ———————— 23
Appendix B Hardware Specications ————— 25

JetStream Gigabit L2 Managed Switch
01Introduction
Chapter 1 Introduction
1.1 Product Overview
T2600G-18TS, T2600G-28TS, T2600G-52TS and T2600G-28MPS are Gigabit Ethernet
switching products recently developed by TP-Link. T2600G-18TS possesses 16 RJ45
ports and 2 SFP slots. T2600G-28TS/T2600G-28MPS possesses 24 RJ45 ports and 4
SFP slots. T2600G-52TS characterizes with 48 RJ45 ports and 4 SFP slots. The SFP slot
enables remote connection with SFP slots on other devices through SFP module and
fiber. T2600G-18TS/T2600G-28TS/T2600G-52TS/T2600G-28MPS is compatible with all
kinds of gigabit SFP modules. Here you are recommended to choose gigabit SFP module
produced by TP-Link, which can perfectly extend your network and enlarge the bandwidth.
T2600G-18TS/T2600G-28TS/T2600G-52TS/T2600G-28MPS is your first choice to extend the
originally large and medium-sized network.
Designed for workgroups and departments, T2600G-18TS/T2600G-28TS/T2600G-52TS/T2600G-
28MPS from TP-Link provides wire-speed performance and full set of L2 management features. It
provides a variety of service features and multiple powerful functions with high security.
The EIA-standardized framework and smart configuration capacity can provide flexible solutions
for a variable scale of networks. Static routing allows devices in different VLANs/subnets to
communicate with each other in an IPv4/IPv6 network. OAM, L2PT and sFlow can meet the
requirement of large ISP customers. ACL, 802.1x and Dynamic ARP Inspection provide robust
security strategies. QoS and IGMP snooping/filtering optimize voice and video application. Link
aggregation (LACP) increases aggregated bandwidth, optimizing the transport of business critical
data. SNMP, RMON, WEB and CLI Log-in bring abundant management policies. TP-Link JetStream
L2 Managed Switch integrates multiple functions with excellent performance, and is friendly to
manage, which can fully meet the need of the users demanding higher networking performance.
1.2 Appearance
■Front Panel
The front panel of T2600G-18TS is shown as the following figure.
Figure 1-1 Front Panel of T2600G-18TS
10/100/1000Mbps
RJ45 Port
LEDs Console
(USB)
Console
(RJ45)
SFP Port

JetStream Gigabit L2 Managed Switch
02 Introduction
The front panel of T2600G-28TS is shown as the following figure.
Figure 1-2 Front Panel of T2600G-28TS
T2600G-28TS
10/100/1000Mbps
RJ45 Port
LEDs Console
(USB)
Console
(RJ45)
SFP Port
LEDs
LED Status Indication
PWR
On The switch is powered on.
Off The switch is powered off or power supply is abnormal.
Flashing Power supply is abnormal.
SYS Flashing The switch works properly.
On/Off The switch works improperly.
1000Mbps On A device is linked to the corresponding port and running at 1000Mbps.
Off A 10/100Mbps device or no device is linked to the corresponding port.
Link/Act
On A device is linked to the corresponding port and running properly.
Flashing Data is being transmitted or received.
Off No device is linked to the corresponding port.
Console (RJ-45) Port
Designed to connect with the serial port of a computer or terminal for monitoring and configuring
the switch.
Console (USB) Port
Designed to connect with the USB port of a computer for monitoring and configuring the switch.
The switch has an RJ-45 console port and a micro-USB console port available. Console input is
active on only one console port at a time. By default, the micro-USB connector takes precedence
over the RJ-45 connector.
10/100/1000Mbps RJ45 Port
Designed to connect to the device with a bandwidth of 10Mbps, 100Mbps or 1000Mbps. Each
10/100/1000Mbps RJ45 port has a corresponding 1000Mbps LED and Link/Act LED.
SFP Port
Designed to install the SFP module. T2600G-28TS features 4 individual SFP ports and supports
1000M SFP module connection only.

JetStream Gigabit L2 Managed Switch
03Introduction
The front panel of The T2600G-52TS is shown as the following figure.
Figure 1-3 Front Panel of T2600G-52TS
ConsoleConsole(USB)
10/100/1000Mbps
RJ45 Port
LEDs
Console
(USB)
Console
(RJ45)
SFP Port
Console (USB) Port
Designed to connect with the USB port of a computer for monitoring and configuring the switch.
The switch has an RJ-45 console port and a micro-USB console port available. Console input is
active on only one console port at a time. By default, the micro-USB connector takes precedence
over the RJ-45 connector.
Console (RJ-45) Port
Designed to connect with the serial port of a computer or terminal for monitoring and configuring
the switch.
LEDs
LED Status Indication
PWR
On The switch is powered on.
Off The switch is powered off or power supply is abnormal.
Flashing Power supply is abnormal.
SYS Flashing The switch works properly.
On/Off The switch works improperly.
10/100/
1000Mbps
(Port 1-48)
Green
On A 1000Mbps device is linked to the corresponding port, but no
activity.
Flashing A 1000Mbps device is linked to the corresponding port and
data is being transmitted or received.
Yellow
On A 10/100Mbps device is linked to the corresponding port, but
no activity.
Flashing A 10/100Mbps device is linked to the corresponding port and
data is being transmitted or received.
Off No device is linked to the corresponding SFP port but no
activity.
Link/Act
(Port 49-52)
On
There is a device linked to the corresponding port.
Flashing The corresponding SFP port is transmitting or receiving data.
Off There is no device linked to the corresponding SFP port.
10/100/1000Mbps RJ45 Port
Designed to connect to the device with a bandwidth of 10Mbps, 100Mbps or 1000Mbps. Each
10/100/1000Mbps RJ45 port has a corresponding 1000Mbps LED.

JetStream Gigabit L2 Managed Switch
04 Introduction
SFP Port
Designed to install the SFP module. T2600G-52TS features 4 individual SFP ports and supports
1000M SFP module connection only.
The front panel of The T2600G-28MPS is shown as the following figure.
Figure 1-4 Front Panel of T2600G-28MPS
10/100/1000Mbps
RJ45 Port
LEDs Console
(USB)
Console
(RJ45)
SFP Port
T2600G-28MPS has an LED mode switch button which is for switching the LED status indication.
When the Speed LED is on, the port LED is indicating the data transmission rate. When the PoE LED
is on, the port LED is indicating the power supply status. By default the Speed LED is on. Pressing
the mode switch button, the Speed LED will turn off and the PoE LED will light up. Then the PoE LED
will turn off after being on for 60 seconds and the Speed LED will light up again.
When the Speed LED is on, the port LED is indicating the data transmission status.
LEDs
LED Status Indication
PWR
On The switch is powered on.
Off The switch is powered off or power supply is abnormal.
Flashing Power supply is abnormal.
SYS Flashing The switch works properly.
On/Off The switch works improperly.
FAN
Green All the fans work properly.
Yellow Not all the fans work properly.
Off The switch works improperly.
Speed or
PoE (Port
1-24）
Green
On A 1000Mbps device is linked to the corresponding port, but no activity.
Flashing A 1000Mbps device is linked to the corresponding port and data is
being transmitted or received.
Yellow
On A 10/100Mbps device is linked to the corresponding port, but no
activity.
Flashing A 10/100Mbps device is linked to the corresponding port and data is
being transmitted or received.
Off No device is linked to the corresponding SFP port but no activity.
1000Base-X
(Port 25-28)
On
There is a device linked to the corresponding port.
Flashing The corresponding SFP port is transmitting or receiving data.
Off There is no device linked to the corresponding SFP port.
When the PoE LED is on, the port LED is indicating the power supply status.

JetStream Gigabit L2 Managed Switch
05Introduction
LEDs
LED Status Indication
PWR
On The switch is powered on.
Off The switch is powered off or power supply is abnormal.
Flashing Power supply is abnormal.
SYS Flashing The switch works properly.
On/Off The switch works improperly.
PoE Max
On The remaining PoE power≤7W.
Flashing The remaining PoE power keeps≤7W after this LED is on for 2
minutes.
Off The remaining PoE power＞7W.
FAN
Green All the fans work properly.
Yellow Not all the fans work properly.
Off The switch works improperly.
Speed or
PoE (Port
1-24）
Green On The port is supplying power normally.
Flashing The supply power exceeds the correponding port's maximum power.
Yellow On Overload or short circuit is detected.
Flashing Power-on self-test has failed.
Off Not providing PoE power on the port.
1000Base-X
(Port 25-28)
On
There is a device linked to the corresponding port.
Flashing The corresponding SFP port is transmitting or receiving data.
Off There is no device linked to the corresponding SFP port.
Console (RJ-45) Port
Designed to connect with the serial port of a computer or terminal for monitoring and configuring
the switch.
Console (USB) Port
Designed to connect with the USB port of a computer for monitoring and configuring the switch.
The switch has an RJ-45 console port and a micro-USB console port available. Console input is
active on only one console port at a time. By default, the micro-USB connector takes precedence
over the RJ-45 connector.
10/100/1000Mbps RJ45 Port
Designed to connect to the device with a bandwidth of 10Mbps, 100Mbps or 1000Mbps. Each
10/100/1000Mbps RJ45 port has a corresponding 1000Mbps LED.
SFP Port
Designed to install the SFP module. T2600G-28MPS features 4 individual SFP ports and
supports 1000M SFP module connection only.

JetStream Gigabit L2 Managed Switch
06 Introduction
Port Feature
Model 10/100/1000Mbps RJ45 Port SFP Port Console Port
T26 0 0G-18TS 16 2 2
T2600G-28TS 24 4 2
T2600G-52TS 48 4 2
T2600G-28MPS 24 4 2
■Rear Panel
The rear panel of the switch is shown as the following figure.
Figure 1-5 Rear Panel
100-240V~50/60Hz 0.5A
Power
Socket
Grounding
Terminal
Kensington
Security slot
Kensington Security Slot
Secure the lock (not provided) into the security slot to prevent the device from being stolen.
Grounding Terminal
The switch already comes with lightning protection mechanism. You can also ground the switch
through the PE (Protecting Earth) cable of AC cord or with Ground Cable. For detailed information,
please refer to Chapter 3 Lightning Protection.
Power Socket
Connect the female connector of the power cord here, and the male connector to the AC power
outlet. Please make sure the voltage of the power supply meets the requirement of the input
voltage (100-240V~ 50/60Hz).
Caution:
Please use the provided power cord.

JetStream Gigabit L2 Managed Switch
07Installation
Chapter 2 Installation
2.1 Package Contents
Make sure that the package contains the following items. If any of the listed items is damaged or
missing, please contact your distributor.
One Power Cord, One Console
Cable and One USB Cable
One Switch This Installation Guide
Installation Guide
BusinessNetworking Solution
Two mounting brackets and the
ttings
One Resouce CD
2.2 Safety Precautions
To avoid any device damage and bodily injury caused by improper use, please observe the following
rules.
■Safety Precautions
■Keep the power off during the installation.
■Wear an ESD-preventive wrist strap, and make sure that the wrist strap has a good skin contact and
is well grounded.
■Use only the power cord provided with the switch.
■Make sure that the supply voltage matches the specifications indicated on the rear panel of the
switch.
■Ensure the vent hole is well ventilated and unblocked.
■Do not open or remove the cover of the switch.
■Before cleaning the device, cut off the power supply. Do not clean it by the waterish cloth, and never
use any other liquid cleaning method.
■Site Requirements
Temperature/Humidity
40℃
0℃

JetStream Gigabit L2 Managed Switch
08 Installation
Please keep a proper temperature and humidity in the equipment room. Too high/low humidity may
lead to bad insulation, electricity leakage, mechanical property changes and corrosions. Too high
temperature may accelerate aging of the insulation materials and can thus significantly shorten
the service life of the device. For normal temperature and humidity of the device, please check the
following table.
Environment Temperature Humidity
Operating 0℃to 40℃10% to 90%RH Non-condensing
Storage -40℃to 70℃5% to 90%RH Non-condensing
Clearness
The dust accumulated on the switch can be absorbed by static electricity and result in poor contact
of metal contact points. Some measures have been taken for the device to prevent static electricity,
but too strong static electricity can cause deadly damage to the electronic elements on the internal
circuit board. To avoid the effect of static electricity on the operation of the Switch, please attach
much importance to the following items:
■Dust the device regularly, and keep the indoor air clean.
■Keep the device well grounded and ensure static electricity has been transferred.
Electromagnetic Interference
Electronic elements including capacitance and inductance on the device can be affected by
external interferences, such as conducted emission by capacitance coupling, inductance coupling,
and impedance coupling. To decrease the interferences, please make sure to take the following
measures:
■Use the power supply that can effectively filter interference from the power grid.
■Keep the device far from high-frequency, strong-current devices, such as radio transmitting station.
■Use electromagnetic shielding when necessary.
Lightening Protection
Extremely high voltage currents can be produced instantly when lightning occurs and the air in the
electric discharge path can be instantly heated up to 20,000℃. As this instant current is strong

JetStream Gigabit L2 Managed Switch
09Installation
enough to damage electronic devices, more effective lightning protection measures should be
taken.
■Ensure the rack and device are well earthed.
■Make sure the power socket has a good contact with the ground.
■Keep a reasonable cabling system and avoid induced lightning.
■Use the signal SPD (Surge Protective Device) when wiring outdoor.
Note:
For detailed lightning protection measures, please refer to Chapter 3 Lightning Protection.
Installation Site
When installing the device on a rack or a flat workbench, please note the following items:
■The rack or workbench is flat and stable, and sturdy enough to support the weight of 5.5kg at least.
■The rack or workbench has a good ventilation system. The equipment room is well ventilated.
■The rack is well grounded. Keep the power socket less than 1.5 meters away from the device.
2.3 Installation Tools
■Phillips screwdriver
■ESD-preventive wrist wrap
■Cables
Note:
These tools are not provided with our product. If needed, please self purchase them.
2.4 Product Installation
■Desktop Installation
To install the device on the desktop, please follow the steps:
1. Set the device on a flat surface strong enough to support the entire weight of the device with all
fittings.
2. Remove the adhesive backing papers from the rubber feet.
3. Turnover the device and attach the supplied rubber feet to the recessed areas on the bottom at
each corner of the device.

JetStream Gigabit L2 Managed Switch
10 Installation
Figure 2-1 Desktop Installation
Feet
Bottom of the Device
Notch
■Rack Installation
To install the device in an EIA standard-sized, 19-inch rack, follow the instructions described below:
1. Check the grounding and stability of the rack.
2. Secure the supplied rack-mounting brackets to each side of the device with supplied screws, as
illustrated in the following figure.
Figure 2-2 Bracket Installation
Rack-mounting Bracket
Screw
3. After the brackets are attached to the device, use suitable screws (not provided) to secure the
brackets to the rack, as illustrated in the following figure.
Figure 2-3 Rack Installation
Rack
Caution:
■Please set 5 to 10cm gaps around the device for air circulation.
■Please avoid any heavy thing placed on the device.
■Please mount devices in sequence from the bottom to top of the rack and ensure a certain
clearance between devices for the purpose of heat dissipation.

JetStream Gigabit L2 Managed Switch
11Lightning Protection
Chapter 3 Lightning Protection
3.1 Cabling Reasonably
In the actual network environment, you may need cable outdoors and indoors, and the requirements
for cabling outdoors and indoors are different. A reasonable cabling system can decrease the
damage of induced lightning to devices.
Note:
It's not recommended using Ethernet cables outdoors. When cabling outdoors, please use a
signal lightning arrester.
■Requirements for Cabling Outdoors
■Aerial cabling without safeguard is not allowed.
■It’s not allowed cabling down the building to connect network devices in different floors.
■Outdoor cables should be buried and paved to the indoor through basement. A piece of steel wire
should be paved underground along the pipe and connected to the lightning protection terminal
of the building for shielding. Before connecting the cable to the device, install a signal lightning
arrester on the corresponding port.
■When an aerial cable is set up, the cable should be through a metal pipe (15m long at least) before
coming into the building. The two ends of this metal pipe should be grounded. Before connecting
the cable to the device, install a signal lightning arrester on the corresponding port.
■It’s not necessary to pave STP cables through pipes. The shielded layer of STP cable should be
well grounded. Before connecting the cable to the device, install a signal lightning arrester on the
corresponding port.

JetStream Gigabit L2 Managed Switch
12 Lightning Protection
■Requirements for Cabling Indoors
When cabling indoors, keep a certain distance away from the devices that may cause high-
frequency interferences, such as down-conductor cable, powerline, power transformer and
electromotor.
■The main cable should be paved in the metal raceway of the access shaft. When cabling, keep the
loop area formed by the cable itself as small as possible.
■Requirements for the distance between Ethernet cable and other pipelines are shown in the table.
Other Pipelines
Ethernet Cable
Min Parallel Net Length L (mm) Min Parallel-overlapping Net
Height H (mm)
Down-conductor 1000 300
PE 50 20
Service pipe 150 20
Compressed air pipe 150 20
Thermal pipe (not
wrapped) 500 500
Thermal pipe (wrapped) 300 300
Gas pipe 300 20
The two diagrams below demonstrate parallel net length and parallel-overlapping net height.
Note:
The above minimum net length/height is required when metal raceway is not used. If any
requirements cannot be met, you can add a steel tube or metal raceway for shielding.
■Requirements for the distance between Ethernet cable and high-power electric devices are in
following tables.
Cable Pave Way Min Parallel
Length (mm)
<2kVA powerline
Parallel cabling 130
One is in the grounded metal raceway or metal pipe 70
The both are in the grounded metal raceway or metal pipe 10
2 to 5kVA
powerline
Parallel cabling 300
One is in the grounded metal raceway or metal pipe 150
The both are in the grounded metal raceway or metal pipe 80
>5kVA powerline
Parallel cabling 600
One is in the grounded metal raceway or metal pipe 300
The both are in the grounded metal raceway or metal pipe 150

JetStream Gigabit L2 Managed Switch
13Lightning Protection
Device Min Distance (m)
Switch case 1.00
Transformer room 2.00
Elevator tower 2.00
Air-conditioner room 2.00
3.2 Connect to Ground
Connecting the device to ground is to quickly release the lightning over-voltage and over-current of
the device, which is also a necessary measure to protect the body from electric shock.
In different environments, the device may be grounded differently. The following will instruct you
to connect the device to the ground in two ways, connecting to the ground via the power supply or
connecting to the ground via the grounding terminal. Please connect the device to ground in the
optimum way according to your specific operation environment.
Note:
For the device without grounding terminal, please refer to the first way Connecting to the
Ground via the Power Supply only.
■Connecting to the Ground via the Power Supply
If the device is installed in the normal environment, the device can be grounded via the PE (Protecting
Earth) cable of the AC power supply as shown in the following figure.
Figure 3-1 Connecting to the Ground via Power Supply
Switch (Rear Panel) AC Power Cord (with PE cable)
Note:
■The figure is to illustrate the application and principle. The power plug you get from the package
and the socket in your situation will comply with the regulation in your country, so they may
differ from the figure above.
■If you intend to connect the device to the ground via the PE (Protecting Earth) cable of AC
power cord, please make sure the PE (Protecting Earth) cable in the electrical outlet is well
grounded in advance.

JetStream Gigabit L2 Managed Switch
14 Lightning Protection
■Connecting to the Ground via the Grounding Terminal
Use the grounding bar
If the device is installed in the Equipment Room, where a grounding bar is available, you are
recommended to connect the device to the grounding bar as shown in the following figure.
Figure 3-1 Connecting to the Grounding Bar
Switch (Rear Panel)
Ground Cable
Grounding Terminal
Grounding Bar
Note:
The grounding bar and the ground cable are not provided with our product. If needed, please
self purchase them.
Equipotential Bonding
Equipotential Bonding is the practice of intentionally electrically connecting all earthed systems
to the same grounding grid or connecting the grounding grids of all the earthed systems together
through the ground or overground metal so as to create an earthed equipotential zone. When
lightning occurs, the high voltage produced by lightning current in all systems will meanwhile exist
in their ground cables, and thus all ground cables have the same electrical potential and basically
eliminate the electric strikes between the systems.
The figure below illustrates how to practice equipotential bonding in a network.
Figure 3-1 Equipotential Bonding
Grounding Terminal Equipotential Bonding Cable
Grounding Bar
Ground Cable

JetStream Gigabit L2 Managed Switch
15Lightning Protection
When equipotential bonding, please note that the cable should be copper wrapped Kelly with its
area being 6mm2at least. The shorter cable the better, and use a grounding bar to establish an
equipotential bonding point.
Note:
The equipotential bonding cable and ground cable are not provided with our product. If
needed, please self purchase it.
Use Lightning Arrester
Power lightning arrester and signal lightning arrester are used for lighting protection.
Power lightning arrester is used for limiting the voltage surge due to a lightning. If an outdoor AC
power cord should be directly connected to the device, please use a power lightning arrester.
Note:
Power lightning arrester is not provided with our product. If needed, please self purchase it.
Signal lightning arrester is used to protect RJ45 ports of the device from lightning. When cabling
outdoors, please install a signal lightning arrester before connecting the cable to the device.
When purchasing or using a signal lightning arrester, please observe the following rules:
■The port rate of the signal lightning arrester should match the rate of the desired port on the device.
If it is not matched, this signal lighting arrester will not work. Purchase a standard lightning arrester.
■Install signal lightning arrester near the protected device and connect it to the ground via a shorter
ground cable.
Figure 3-1 Use Lightning Arrester
Ethernet CableEquipotential Bonding CableGrounding Terminal
Signal Lightning Arrester Device
Note:
Signal lightning arrester is not provided with our product. If needed, please self purchase it.

JetStream Gigabit L2 Managed Switch
16 Connection
Chapter 4 Connection
4.1 Ethernet Port
Connect an Ethernet port of the switch to the computer by RJ45 cable as the following figure
shows.
Figure 4-1 Connecting the RJ45 Port
RJ45 Port
RJ45 Cable
4.2 SFP Port
Figure 4-2 demonstrates the connection of SFP port to an SFP module.
Figure 4-2 Inserting the SFP Module
SFP Slot
SFP Module
4.3 Console Port
CLI (Command Line Interface) enables you to manage the switch, thus you can load the CLI after
connecting the PCs or Terminals to the console port on the switch via the provided cable.
Connect the Console (RJ-45) port of the device with your computer by the console cable as the
following figure shows.