Lantronix SM24TBT2DPB User manual

SM24TBT2DPB
Managed Gigabit Ethernet PoE++ Switch
(24) 10/100/1000Base-T Ports + (2) 100/1000Base-X SFP/RJ-45 Combo Ports
Install Guide
Part Number 33845
Revision B June 2022

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Intellectual Property
© 2022 Lantronix, Inc. All rights reserved. No part of the contents of this publication may be transmitted or
reproduced in any form or by any means without the written permission of Lantronix.
Lantronix is a registered trademark of Lantronix, Inc. in the United States and other countries. All other
trademarks and trade names are the property of their respective holders.
Patented: https://www.lantronix.com/legal/patents/; additional patents pending.
Warranty
For details on the Lantronix warranty policy, go to our web site at http://www.lantronix.com/support/warranty.
Contacts
Lantronix Corporate Headquarters
7535 Irvine Center Drive
Suite100
Irvine, CA 92618, USA
Toll Free: 800-526-8766
Phone: [phone]
Fax: [phone]
Technical Support
Online: https://www.lantronix.com/technical-support/
Sales Offices
For a current list of our domestic and international sales offices, please go to www.lantronix.com/about/contact.
Disclaimer
All information contained herein is provided “AS IS.” Lantronix undertakes no obligation to update the information
in this publication. Lantronix does not make, and specifically disclaims, all warranties of any kind (express, implied
or otherwise) regarding title, non-infringement, fitness, quality, accuracy, completeness, usefulness, suitability or
performance of the information provided herein. Lantronix shall have no liability whatsoever to any user for any
damages, losses and causes of action (whether in contract or in tort or otherwise) in connection with the user’s
access or usage of any of the information or content contained herein. The information and specifications
contained in this document are subject to change without notice.
Revision History
Date
Rev.
Comments
4/25/22
A
Initial Lantronix SM24TBT2DPB release at FW VB6.64.0045.
6/16/22
B
Correct model number references on page 19.

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Contents
Contents ....................................................................................................................................................................3
1. Introduction..........................................................................................................................................................5
Product Description ................................................................................................................................................5
About This Manual..................................................................................................................................................5
Ordering Information...............................................................................................................................................5
Related Documentation ..........................................................................................................................................6
Features..................................................................................................................................................................6
PoE Features......................................................................................................................................................6
Software Features ..............................................................................................................................................6
Device Management System (DMS) Features...................................................................................................6
Specifications..........................................................................................................................................................7
Software Feature Descriptions ...............................................................................................................................8
Applications ..........................................................................................................................................................11
Front Panel .......................................................................................................................................................... 12
LED Descriptions ............................................................................................................................................. 13
Mode/Reset Button .......................................................................................................................................... 15
Back Panel........................................................................................................................................................... 15
2. Installation......................................................................................................................................................... 16
Safety Precautions............................................................................................................................................... 16
Cautions and Warnings ....................................................................................................................................... 16
Electrical Safety Warnings................................................................................................................................... 18
What’s in the Box................................................................................................................................................. 19
Mounting the Switch on Desk or Shelf................................................................................................................. 20
Safety Instructions for Rack Mount Installations ................................................................................................. 20
Mounting the Switch in a 19-inch Rack ............................................................................................................... 21
Installing SFP Modules ........................................................................................................................................ 22
Grounding ............................................................................................................................................................ 22
3. Power Supply Information ............................................................................................................................ 23
Cautions and Warnings ....................................................................................................................................... 23
PS-ACDC-1200 Features .................................................................................................................................... 23
PS-ACDC-1200 Specifications ............................................................................................................................ 24
PS-ACDC-1200 Install Orientation ...................................................................................................................... 24
Saf-D-Grid®Connector .................................................................................................................................... 26
If Using AC Power................................................................................................................................................ 27
If Using DC Power ............................................................................................................................................... 27
If Using Digital Electricity™ (DE) ......................................................................................................................... 27
Replacing a High Voltage (HVAC/HVDC) Power Supply .................................................................................... 28
4. Initial Switch Configuration ............................................................................................................................. 29
Initial Switch Configuration via Web Browser...................................................................................................... 29
Initial Switch Configuration via CLI ...................................................................................................................... 30
Switch CLI Command Notes ........................................................................................................................... 30
Switch Configuration Web UI Notes .................................................................................................................... 32
SM24TBT2DPB-2XPS Power Supply Operating Mode Settings .................................................................... 33
5. Related Information ....................................................................................................................................... 35
Power Consumption Specifications ..................................................................................................................... 35

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Troubleshooting ................................................................................................................................................... 42
Basic Troubleshooting ..................................................................................................................................... 42
LED Summary ................................................................................................................................................. 42
LED Troubleshooting ....................................................................................................................................... 43
Troubleshooting PoE Problems ........................................................................................................................... 44
Compliance Information....................................................................................................................................... 45
FCC Regulations ............................................................................................................................................. 45
Canadian Regulations ..................................................................................................................................... 45
CE Mark........................................................................................................................................................... 45
RoHS, REACH and WEEE Compliance Statement ........................................................................................ 45
Declaration of Conformity ................................................................................................................................ 46
Package and Device Labels ................................................................................................................................ 46
Record Device and System Information.............................................................................................................. 47

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1. Introduction
Product Description
The switch is a high performance Layer 2 managed switch with 52 Gbps switching capacity. It provides (24)
10/100/1000Mbps copper ports with IEEE 802.3bt PoE++ capability and (2) additional 100/1000Mbps dual
speed SFP/RJ-45 combo ports. The SM24TBT2DPB complies with the latest IEEE 802.3bt PoE++ standard and
supplies up to 90 Watts per port. It can provide full PoE++ output on all 24 ports when equipped with the dual
hot-swappable PS-ACDC-1200 power supplies. The SM24TBT2DPB can be powered by low-line and high-line
AC or DC power and Digital Electricity™(DE), making it ideal for use in a wide variety of building applications.
About This Manual
This manual describes the switch and how to install, configure, and troubleshoot the switch, including how to:
•Install, connect, and power the switch
•Check switch status by reading the LED behavior
•Reset the switch or to restore the switch to factory defaults
•Use a Web browser or the CLI to initially configure the switch
•Troubleshoot the switch
Ordering Information
SKU Description
SM24TBT2DPB
Managed Gigabit Ethernet PoE++ Switch; (24) 10/100/1000Base-T Ports + (2)
100/1000Base-X SFP/RJ-45 Combo Ports. Includes one PS-ACDC-1200 power
supply and 19” rack mount brackets. Switch with one power supply; no cables (for
Digital Electricity
™
applications only).
SM24TBT2DPB-xx
Managed Gigabit Ethernet PoE++ Switch; (24) 10/100/1000Base-T Ports + (2)
100/1000Base-X SFP/RJ-45 Combo Ports. Includes one PS-ACDC-1200 power
supply, 19” rack mount brackets, one Saf-D adapter cable, and country-specific
power cord(s).
SM24TBT2DPB-2XPS
Managed Gigabit Ethernet PoE++ Switch; (24) 10/100/1000Base-T Ports + (2)
100/1000Base-X SFP/RJ-45 Combo Ports. Includes two PS-ACDC-1200 power
supplies, 19” rack mount brackets; no cables (for Digital Electricity™applications
only).
SM24TBT2DPB-2XPS-xx
Managed Gigabit Ethernet PoE++ Switch; (24) 10/100/1000Base-T Ports + (2)
100/1000Base-X SFP/RJ-45 Combo Ports. Includes two PS-ACDC-1200 power
supplies, 19” rack mount brackets, two Saf-D adapter cables, and country-specific
power cords.
Optional Accessories (sold separately)
PS-ACDC-1200
Secondary AC & DC Modular Power Supply (1080 Watts PoE Output Max)
Warranty: 5 Years (optional – order separately). Additional power supply if
customer initially orders switch with one power supply and wants to add the second
power supply later; no cables (for Digital Electricity
™
applications only).
PS-ACDC-1200-xx
Additional power supply if customer initially orders switch with one power supply
and wants to add the second power supply later; one Saf-D adapter cable, and
country-specific power cord(s).
SFP+ Modules See our SFP product page (optional – order separately).
Note: Digital Electricity is a trademark of VoltServer. For more information about Digital Electricity, visit
https://www.voltserver.com/.

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Related Documentation
•SM24TBT2DPB Quick Start Guide, 33844
•SM24TBT2DPB Install Guide, 33845 (this manual)
•SM24TBT2DPA and DPB Web User Guide, 33738
•SM24TBT2DPA and DPB CLI Reference, 33739
•Release Notes (version specific)
Features
•Hot-swappable dual power supply modules
•IPv4/IPv6 dual protocol stack
•Jumbo Frame up to 9K bytes
•Authentication – RADIUS, TACACS+
•Security – SSH v1/SSH v2/SSL
•Port based or tagged (IEEE 802.1Q) VLAN, MAC based, Management VLAN and Private VLAN Edge
•DHCP Relay, DHCP Server
•L2/L3/L4 ACLs, MAC ACL, IP standard/extended ACL
•LLDP (Link Layer Discovery Protocol)
•IEEE 802.3az Energy Efficiency
•IP Source Guard, Port Security
PoE Features
•Compliant with IEEE 802.3bt PoE++
•Compliant with IEEE 802.3at PoE+
•Compliant with IEEE 802.3af PoE
•IEEE 802.1AB LLDP-MED Configuration
•PoE Configuration
•PoE Scheduling
•Auto Power Reset
•DHCP per Port
•Always on PoE
•Ultra-Fast PoE
Software Features
•Management: Web Management, SNMP V1/V2c/V3, Telnet, CLI, REST API
•Port Trunk: Supports IEEE 802.3ad port trunk with link aggregation control protocol (LACP) and static trunk
•IGMP: Supports IGMP Snooping V1/V2/V3, GVRP, IGMP Proxy, and IGMP Querier
•Quality of Service: Supports 8 hardware queues. Strict priority and WRR
•Spanning Tree: Supports IEEE 802.1s MSTP, IEEE 802.1w RSTP and IEEE 802.1D STP Compliant
•Rapid Ring
•VLAN: Port Based VLAN, IEEE 802.1Q tag-based, up to 4k VLAN entries, QinQ, MAC-based VLAN, Private
VLAN, Voice VLANs and Management VLAN
•Firmware Update, configuration backup/restore via TFTP and HTTP
Device Management System (DMS) Features
•Graphical Monitoring – Topology view, Floor view, Map view
•Traffic Monitoring – Shows a chart of network performance the devices – all the ports or a specific port
•Troubleshooting – Network diagnostic, protection mechanism, performance and link management
•Firmware Upgrades, Find Switch, Notifications, and Monitoring/Polling via DMS

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Specifications
Standards
IEEE 802.3, IEEE 802.3u, IEEE 802.3z, IEEE 802.3ae, IEEE 802.3x, IEEE 802.3ad,
IEEE 802.1D, IEEE 802.1w, IEEE 802.1s, IEEE 802.1Q, IEEE 802.1p, IEEE 802.1ad,
IEEE 802.1AB, IEEE 802.3af, IEEE 802.3at, IEEE 802.3bt, IEEE 802.3az
Connectors
(1) RJ console port; (24) 10/100/1000 RJ-45 ports; (2) 100/1000 SFP/RJ-45 combo
ports
Protocols
CSMA/CD
Technology
Store-and-Forward switching architecture
MAC Address
8K MAC address table
Backplane
52 Gbps
Dimensions
Width: 17.4” [442 mm] x Depth: 11.8” [300 mm] x Height: 1.73” [44 mm]
Power Input
Dual Hot-Swappable Power Supplies; Power Redundancy, Failover: PS-ACDC-1200
AC low-line: 100 - 120VAC
AC high line: 200 - 277VAC
HVDC low-line : 194 - 254VDC
HVDC high-line: 306 - 334VDC
Power Consumption
Maximum Power Consumption without PoE:
79 Watts with dual AC power modules
52 Watts with single AC power module
Power over Ethernet
Max 90 Watts output per port:
AC low-line: 900W (single PS), 1,800W (dual PS)
AC high-line: 1,080W (single PS), 2,160W (dual PS)
HVDC low-line: 900W (single PS), 1,800W (dual PS)
HVDC high-line: 1,080W (single PS), 2,160W (dual PS)
Environment
Operating Temp: 0°C to +40°C (32 to 104°F).
Storage Temp: -20 to +40°C (-4 to +158°F)
Humidity: 10% to 90% (non-condensing)
Weight
SM24TBT2DPB (single power supply) = 11.3 lbs [5.12 kg]
SM24TBT2DPB-2XPS (dual power supplies) = 13.3 lbs [6.03 kg]
Certifications
FCC Class A, CE, UL62368-1
Warranty
Lifetime (switch); 5 Years (power supply)
MTBF
SM24TBT2DPB: Relex Software Standard Reliability Prediction Report; GB, GC – Ground Benign, Controlled:
Configuration Temperature MTBF
SM24TBT2DPB with 2 PSU 25.00°C 168,959 Hrs.
SM24TBT2DPB with 2 PSU 40.00°C 98,720 Hrs.
SM24TBT2DPB 25.00°C 204,204 Hrs.
SM24TBT2DPB 40.00°C 116,208 Hrs.

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Software Feature Descriptions
Layer 2 Switching
Spanning Tree
Protocol (STP)

Standard Spanning Tree 802.1d
Rapid Spanning Tree (RSTP) 802.1w
Multiple Spanning Tree (MSTP) 802.1s
Trunking
Link Aggregation Control Protocol (LACP) IEEE 802.3ad
Up to 13 groups

Up to 16 ports per group
VLAN
Supports up to 4K VLANs simultaneously (out of 4096 VLAN IDs)
Port-based VLAN
802.1Q tag-based VLAN
MAC-based VLAN
Management VLAN
Private VLAN Edge (PVE)
Q-in-Q (double tag) VLAN
Voice VLAN

GARP VLAN Registration Protocol (GVRP)
DHCP Relay 
Relay of DHCP traffic to DHCP server in different VLAN.
Works with DHCP Option 82
IGMP v1/v2/v3
Snooping
IGMP limits bandwidth-intensive multicast traffic to only the requesters. Supports 1024
multicast groups.
IGMP Querier IGMP querier is used to support a Layer 2 multicast domain of snooping switches in
the absence of a multicast router.
IGMP Proxy
IGMP snooping with proxy reporting or report suppression actively filters IGMP packets
to reduce load on the multicast router.
MLD v1/v2 Snooping Delivers IPv6 multicast packets only to the required receivers.
Device Management System (DMS)
Graphical
Monitoring

Topology View provides end-to-end visibility of attached PDs with remote access.
Floor View allows the designer to import existing JPEGs or PNGs of the floor and
site drawings into DMS
Google Maps™ View lets you drag and drop PDs and be visible by State, City, and
Street Address
Find my Switch
Locate your switch quickly and manage directly.
Traffic Monitoring Displays a visual chart of network traffic of all devices to let you monitor every port at
any time from a switch
Troubleshooting Network diagnostic, protection mechanism, performance and link management

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Layer 3 Switching
IPv4 Static Routing
IPv4 Unicast Static routing
IPv6 Static Routing
IPv6 Unicast Static routing
Security
Secure Shell (SSH)
SSH secures Telnet traffic in or out of the switch; SSH v1 and v2 are supported
Secure Sockets Layer
(SSL)
SSL encrypts the HTTP traffic, allowing advanced secure access to the browser-based
management GUI in the switch.
IEEE 802.1X
IEEE802.1X: RADIUS authentication, authorization and accounting, MD5 hash,
guest VLAN, single/multiple host mode and single/multiple sessions
Supports IGMP-RADIUS based 802.1X
Dynamic VLAN assignment
Layer 2 Isolation
Private VLAN Edge
PVE (also known as protected ports) provides L2 isolation between clients in the same
VLAN. Supports multiple uplinks
Port Security
Locks MAC addresses to ports and limits the number of learned MAC address.
IP Source Guard
Prevents illegal IP address from accessing a specific switch port.
RADIUS/ TACACS+ Supports RADIUS and TACACS+ authentication; the switch acts as a client.
Storm Control
Prevents traffic on a LAN from being disrupted by a broadcast, multicast, or unicast
storm on a port.
DHCP Snooping
Acts as a firewall between untrusted hosts and trusted DHCP servers
ACLs
Supports up to 256 entries. Drop or rate limitation based on:
•Source and destination MAC, VLAN ID or IP address, protocol, port
•Differentiated Services Code Point (DSCP) / IP precedence
•TCP/ UDP source and destination ports
•802.1p priority
•Ethernet type
•Internet Control Message Protocol (ICMP) packets
•TCP flag
Quality of Service (QoS)
Hardware Queue
Supports 8 hardware queues
Scheduling 
Strict priority and weighted round-robin (WRR)
Queue assignment based on DSCP and class of service
Classification

Port based
802.1p VLAN priority based
IPv4/IPv6 precedence / DSCP based
Differentiated Services (DiffServ)
Classification and re-marking ACLs
Rate Limiting

Ingress policer
Egress shaping and rate control

Per port

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Management
DHCP Server
Supports DHCP server to assign IP to DHCP clients
DHCP per Port
You can assign an IP address based on the switch port the device is connected to.
This will speed up installations of IP cameras; cameras can be configured after they
are on the network. The per-port assignment allows you to know which IP was
assigned to which camera.
Link-Local Address
binding interface
Configure Link-Local IP address to a different VLAN interface. The first IP interface
entry (169.254.xx.xx) is for the default value (VLAN 1). A link-local address is a unicast
address having link-only scope that can be used to reach neighbors. All interfaces on
routers must have a link-local address. Also, ADDRCONF requires that interfaces on
hosts have a link-local address.
Event Notifications
•Event Notification via Syslog and/or SNMP Traps
•Event Notification with 8 Severity levels
Remote Monitoring
(RMON)
Embedded RMON agent supports RMON groups 1,2,3,9 (history, statistics, alarms,
and events) for enhanced traffic management, monitoring and analysis
Port Mirroring
Traffic on a port can be mirrored to another port for analysis with a network analyzer or
RMON probe. Up to n-1 (where nis the max number of Switch Ports) ports can be
mirrored to single destination port. A single session is supported.
UpnP Universal Plug and Play (UPnP) is a network protocol that allows compliant devices to
automatically set port forwarding rules for themselves.
s-Flow
The industry standard for monitoring high speed switched networks. It gives complete
visibility into the use of networks enabling performance optimization, accounting/billing
for usage, and defense against security threats
IEEE 802.1ab (LLDP)
•Used by network devices for advertising their identities, capabilities, and neighbors
on an IEEE 802ab local area network
•Support LLDP-MED extensions
Web GUI Interface Built-in switch configuration utility for browser-based device configuration
CLI For configuring / managing the switch in Command Line Interface modes
Dual Image
Independent primary and secondary images for backup while upgrading
SNMP SNMP version1, 2c and 3 with support for traps, and SNMP version 3 user-based
security model (USM)
Firmware Upgrade •Web browser upgrade (HTTP/ HTTPs) and TFTP
•Upgrade via the console port
NTP Network Time Protocol (NTP) is a networking protocol for clock synchronization
between computer systems over packet-switched
Restful API Allows switch to be monitored and managed through Cloud Management Systems or
integrated with Network Management Systems and Video Management Systems.
Other Management
•HTTP/HTTPS; SSH
•DHCP Client/ DHCPv6 Client
•Cable Diagnostics
•Ping
•Syslog
•Telnet Client
•IPv6 Management

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Power over Ethernet (PoE)
Port Configuration Supports per-port PoE configuration function
PoE Scheduling
Supports per port PoE scheduling to turn on/off the PoE devices (PDs);
Auto Power Reset
Checks the link status of PDs and reboots PDs if there are no responses.
Automatically monitors and reboots PDs when no response to ICMP is received.
Power Delay
The switch provides power to the PDs based on configurable delay time when PoE
switch boots up, to protect switch from misuse of the PDs
Always on PoE
Lets you restart device, upload software, or swap active and alternate (backup)
firmware images while retaining PoE power to PDs. Note: It will take 75 – 80 seconds
to have PoE++ power on the ports to power PDs again if the switch makes a cold
restart. “Always on PoE” has no effect on this time. Allows warm reboot of the switch
without affecting the PoE output to the attached PDs.
Ultra-fast PoE
Improves PoE startup time. Ultra-fast PoE enables PoE output to attached PDs within 5
seconds after a cold start.
IEEE 802.3bt/at/af
compliant
Compliance with latest PoE standard allows the switch to provide up to 90W per port.
Supports full 90 Watts
per port
on all 24 ports simultaneously (with secondary power supply installed). This enables
higher power PoE applications such as LED lighting or digital signage on all ports
Hot-swappable dual
power modules
Allows for scaling of PoE power depending on needs or provides redundancy to
eliminate system downtime.
Powering options
Accommodates low-line and high-line AC or DC power and Digital Electricity™, making
it ideal for use in a wide variety of building applications. Note: Digital Electricity is a
trademark of VoltServer. For more information about Digital Electricity, visit
https://www.voltserver.com/.
Saf-D power
connector
Provides increased safety features for connecting higher voltage DC or hybrid AC/DC
systems.
Applications
•LED Lighting, supplying power and connectivity to lighting and other building IoT devices.
•IP Surveillance, supplying power and data to PTZ IP cameras, thermal cameras.
•Supplying power and data to thin clients, POS system, digital signage.

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Front Panel
The SM24TBT2DPB front panel LEDs, ports and buttons are shown and described below.

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LED Descriptions
The LEDs on the front panel provide switch status checking and monitoring. The four types of LEDs are described
below:
SYS (System) LED: indicates if the switch is powered up correctly or indicates if there is a system alarm triggered
for troubleshooting.
LED Color State Description
System
Green On The switch is powered ON correctly.
Off The switch is not receiving power.
Red On An abnormal state, such as exceeding operating temperature
range, has been detected in the switch.
Mode LEDs: indicate the mode of all RJ45/SFP ports on the switch. You can press the Mode/Reset button
sequentially to switch between the two different modes (Link/Activity/Speed mode and PoE mode).
LED Color State Description
Link/Act/Speed Green On The Port Status LEDs display link status, network activity and
speed of each port.
PoE Green On
The RJ45 Port Status LEDs display PoE powering status of each
port.
Power Supply LEDs: The LEDs on the Power Supply indicate power status for each Power Supply.
LED Color State Description
AC
Green
Red
--
On
On
Off
AC Input is ready.
AC Input has failed.
AC Input is off.
DC
Green
Red
--
On
On
Off
DC output is ready.
DC output has failed.
DC output is off.

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Port Status LEDs: indicate the current status of each RJ45 and SFP port. You can check these LEDs to
understand the port status in different modes, after changing the mode by pressing the Mode/Reset button.
Press the Mode/Reset button for less than 2 seconds to change LED modes (Link/Act/Speed Mode or PoE
Mode); you can then check the port status by reading the LED behaviors per the table below.
Table 3: Port Status LEDs
When Link/Act/Speed Mode LED Lit
LED Color State Description
RJ45
Ports
Green On
The port is enabled and established a link to connected device, and the connection
speed is 1000Mbps.
Green Blinking The port is transmitting/receiving packets, and the connection speed is 1000Mbps.
Amber On
The port is enabled and established a link to connected device, and the connection
speed is 10/100Mbps.
Amber Blinking The port is transmitting/receiving packets, and the connection speed is 10/100Mbps.
-- Off
The port has no active network cable connected, or it has not established a link to
connected device. Otherwise, the port may have been disabled through the switch
user interface.
SFP
Ports
Green On
The port is enabled and has established a link to connected device, and the
connection speed is 1000Mbps.
Green Blinking The port is transmitting/receiving packets, and the connection speed is 1000Mbps.
Amber On
The port is enabled and has established a link to connected device, and the
connection speed is 100Mbps.
Amber Blinking The port is transmitting/receiving packets, and the connection speed is 100Mbps.
-- Off The port has no active network cable connected, or it has not established a link to
connected device. Otherwise, the port may have been disabled via the switch UI.
When PoE Mode LED Lit
LED
Color
State
Description
RJ45
Ports
Green On The port is enabled and supplying power to connected device.
Amber On An abnormal state, such as overload status, has been detected in the switch.
-- Off
The port has no active network cable connected, or it is not connected to a PoE PD
device. Otherwise, the port may have been disabled via the switch UI.

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Mode/Reset Button
Pressing the front panel Mode/Reset button for a period of time lets you
perform these tasks:
•Change Port Status LED Mode: to read the port status correctly in the two
different modes (Link/Act/Speed mode or PoE mode).
•Reset the Switch: to reboot and get the switch back to the previous
configuration settings saved. Note that there is also an Always-On PoE
(soft reboot) feature which allows the switch to reboot without affecting PoE
port power via the Web UI or CLI.
•Restore the Switch to Factory Defaults: to restore the switch to its original
factory default settings.
Note: Use the table below to determine which task is being performed by reading the LED behaviors while
pressing and holding the Mode/Reset button. When the LED behavior displays correctly, release the button.
Table 4: Mode/Reset Button Descriptions
Task to Perform Press Button for SYS LED Behavior Port Status LED Behavior
Change LED Mode 0 ~ 2 seconds ON Green LED status will change based on the mode
selected.
Reset the Switch 2 ~ 7 seconds Blinking Green ALL LEDs Off.
Restore to Defaults 7 ~ 12 seconds Blinking Green ALL LEDs stay On.
Back Panel
The back panel provides two power supply slots and an airflow opening. Caution: Be sure to leave adequate
room for the airflow openings on both side panels and on the back panel.

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2. Installation
This chapter provides a high-level procedure for installing the SM24TBT2DPB followed by more detailed
information about the connections and power supplies.
Safety Precautions
Please follow the safety precautions described below when installing and operating the switch.
Cautions and Warnings
Definitions
Cautions indicate that there is the possibility of poor equipment performance or potential damage to the
equipment. Warnings indicate that there is the possibility of injury to person.
Cautions and Warnings appear here and may appear throughout this manual where appropriate. Failure to read
and understand the information identified by this symbol could result in poor equipment performance, damage to
the equipment, or injury to persons.
Caution: EQUIPMENT IS FOR INDOOR USE ONLY!
Caution: Changes or modifications not expressly approved by the party responsible for compliance could void the
user’s authority to operate the equipment.
Caution : While installing or servicing the power supply, wear a grounding device and observe all electrostatic
discharge precautions. Failure to observe this caution could result in damage to, or failure of the power supply.
Warnings
Warning: Do not connect the power supply to an external power source before installing it into the chassis. Failure
to observe this warning could result in an electrical shock, even death.
WARNING: The power supply has a provision for grounding. Equipment grounding is vital to ensure safe
operation. The installer must ensure that the power supply is properly grounded during and after installation.
Failure to observe this warning could result in an electric shock, even death.
WARNING: A readily accessible, suitable National Electrical Code (NEC) or local electrical code approved
disconnect device and branch-circuit protector must be part of the building's installed wiring to accommodate
permanently connected equipment. Failure to observe this warning could result in an electric shock, even death.
WARNING: Turn the external power source OFF and ensure that the power supply is disconnected from the
external power source before performing any maintenance. Failure to observe this warning could result in an
electrical shock, even death.
WARNING: Ensure that the disconnect device for the external power source is OPEN (turned OFF) before
disconnecting or connecting the power leads to the power supply. Failure to observe this warning could result in
an electric shock, even death.
See Electrical Safety Warnings below for Electrical Safety Warnings translated into multiple languages.
See the ANSI/NECA/BICSI 568-2006 Standard for Installing Commercial Building Telecommunications Cabling.
Ethernet and PoE Intra-Building Cabling Warning
Warning: Ethernet cables are intended for intrabuilding use only. Connecting your Lantronix switch directly to
Ethernet cables that run outside the building in which the switch is housed will void the user's warranty and could
create a fire or shock hazard.

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High Risk Activities Disclaimer
Components, units, or third-party products used in the product described herein are NOT fault-tolerant and are
NOT designed, manufactured, or intended for use as on-line control equipment in the following hazardous
environments requiring fail-safe controls: the operation of Nuclear Facilities, Aircraft Navigation or Aircraft
Communication Systems, Air Traffic Control, Life Support, or Weapons Systems ("High Risk Activities"). Lantronix
and its supplier(s) specifically disclaim any expressed or implied warranty of fitness for such High Risk Activities.
Network Safety
This subclause sets forth a number of recommendations and guidelines related to safety concerns. The list is
neither complete nor does it address all possible safety issues. The designer is urged to consult the relevant local,
national, and international safety regulations to verify compliance with the appropriate requirements. LAN cabling
systems described in this clause are subject to at least four direct electrical safety hazards during their installation
and use. These hazards are as follows:
a) Direct contact between LAN components and power, lighting, or communications circuits.
b) Static charge buildup on LAN cabling and components.
c) High-energy transients coupled onto the LAN cabling system.
d) Voltage potential differences between safety grounds to which various LAN components are connected.
Such safety hazards should be avoided or appropriately protected against for proper network installation and
performance. In addition to provisions for proper handling of these conditions in an operational system, special
measures should be taken to verify that the intended safety features are not negated during installation of a new
network or during modification of an existing network.
Equipment shall comply with all applicable local and national codes related to safety.
Note that this manual provides links to third part web sites for which Lantronix is not responsible.
US Electrical System Design Standards
These US standards define all electrical rules and requirements necessary to connect and use electricity.
In the US, the basic standards to adhere to when designing electrical systems are:
•American National Standards Institute (ANSI)
•National Electrical Manufacturers Association (NEMA)
•Institute of Electrical and Electronics Engineers (IEEE) Standards
•National Electric Code (NEC) (required for electric service up to 600 Volts)
•IEEE color book publications (for IT installations in different facilities)
Other Worldwide Standards
Other standards to use worldwide are based on IEC (International Electrotechnical Commission) Standards:
•BS (British Standards)
•DIN (German Standards)
•CEI (Italian Standards)
•EN (European Norm) Standards
Low-line vs High-line Input Voltage Selection
Use diligence when selecting the proper input voltage in the Americas and other world regions that follow North
American commercial wiring practices. Selecting low-line operation vs high-line operation affects power supply
output capacity and reliability, power supply thermal operation, and power conversion efficiency.

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Electrical Safety Warnings
Electrical Safety
IMPORTANT: This equipment must be installed in accordance with safety precautions.
Elektrische Sicherheit
WICHTIG: Für die Installation dieses Gerätes ist die Einhaltung von Sicherheitsvorkehrungen erforderlich.
Elektrisk sikkerhed
VIGTIGT: Dette udstyr skal installeres i overensstemmelse med sikkerhedsadvarslerne.
Elektrische veiligheid
BELANGRIJK: Dit apparaat moet in overeenstemming met de veiligheidsvoorschriften worden geïnstalleerd.
Sécurité électrique
IMPORTANT: Cet équipement doit être utilisé conformément aux instructions de sécurité.
Sähköturvallisuus
TÄRKEÄÄ: Tämä laite on asennettava turvaohjeiden mukaisesti.
Sicurezza elettrica
IMPORTANTE: questa apparecchiatura deve essere installata rispettando le norme di sicurezza.
Elektrisk sikkerhet
VIKTIG: Dette utstyret skal installeres i samsvar med sikkerhetsregler.
Segurança eléctrica
IMPORTANTE: Este equipamento tem que ser instalado segundo as medidas de precaução de segurança.
Seguridad eléctrica
IMPORTANTE: La instalación de este equipo deberá llevarse a cabo cumpliendo con las precauciones de
seguridad.
Elsäkerhet
OBS! Alla nödvändiga försiktighetsåtgärder måste vidtas när denna utrustning används.

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What’s in the Box
Verify that you have received the following items. Contact your place of purchase if any item is missing or
damaged. Please save the packaging for possible future use.
If ordered as SM24TBT2DPB (for Digital Electricity applications):
•One switch with one power supply included
•Two 19" rack mount brackets
•Eight screws
•One DB9F to RJ45 cable
•Four rubber feet
•One LTX insert card
•One printed Quick Start Guide
(If ordered as SM24TBT2DPB-2XPS, two power supplies are included.)
If ordered as SM24TBT2DPB-xx** (for AC or DC powered applications):
All of the above items plus:
•One Saf-D adapter cable
•Country-specific IEC adapter power cord(s) for low/high power AC and DC
(If ordered as SM24TBT2DPB-2XPS-xx, two power supplies and two sets of Saf-D adapter cables and power
cords are included.)
** Power Cord Included: Power cord is selected to handle the higher power capability of this switch; use only
power cords provided with your switch. To order the corresponding country specific power cord(s), add the
extension to the end of the SKU. For example: SM24TBT2DPB-NA = North America, -LA = Latin America,
-EU = Europe, -UK = United Kingdom, -SA = South Africa, -JP = Japan, -OZ = Australia, -BR = Brazil.
Note:
a. The switch is an indoor device. If you need to use it to connect outdoor devices such as outdoor IP cameras or
outdoor WiFi Aps with cable, you must install an arrester on the cable between outdoor device and the switch.
Add an arrester between outdoor device and this switch
b. The marking information is located at the bottom of apparatus (IEC 62368-1).

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Mounting the Switch on Desk or Shelf
1. Verify that the workbench is sturdy and reliably grounded.
2. Attach the four adhesive rubber feet to the bottom of the switch.
Safety Instructions for Rack Mount Installations
The instructions below (or similar) are intended for rackmount installation environments:
1. Elevated Operating Ambient: if installed in a closed or multi-unit rack assembly, the operating ambient
temperature of the rack environment may exceed room ambient. Install the equipment in an environment
compatible with the maximum ambient temperature (Tma) specified.
2. Reduced Air Flow: install the equipment in a rack so that the amount of air flow required for safe operation is
not compromised.
3. Mechanical Loading: Mount the equipment in the rack so that a hazardous condition does not occur due to
uneven mechanical loading (weight distribution/rack balance).
4. Circuit Overloading: consider the connection of the equipment to the supply circuit and the effect that
overloading of the circuits might have on overcurrent protection and supply wiring. Consider all equipment
nameplate ratings when addressing this concern.
5. Reliable Earthing: maintain reliable earthing of rack-mounted equipment; pay particular attention to supply
connections other than direct connections to the branch circuit (e.g., use of power strips).