Transition Networks SM24DPa User manual

Rev.A0
19-Mar-11
SM24DPA
16-Port 100/1000 SFP plus
8 RJ-45/100/1000 SFP Combo Port
Managed Switch
User Guide

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1-Mar-11
i
Regulatory Approval
- FCC Class A
- UL 60950
- CSA C22.2 No. 950
- EN60950
- CE
- EN55022 Class A
- EN55024
Canadian EMI Notice
This Class Adigital apparatus meets all the requirements of the Canadian Interference-Causing Equipment
Regulations.
Cet appareil numerique de la classe A respecte toutes les exigences du Reglement sur le materiel brouilleur
du Canada.
European Notice
Products with the CE Marking comply with both the EMC Directive (2004/108/EC) and the Low Voltage
Directive (2006/95/EC) issued by the Commission of the European Community Compliance with these
directives imply conformity to the following European Norms:
EN55022 (CISPR 22) - Radio Frequency Interference
EN60950 (IEC950) - Product Safety
Warranty
Lifetime
To Contact Transition Networks
For prompt response when calling for service information, have the following information
ready: - Product serial number and revision
- Date of purchase
- Vendor or place of purchase
You can reach Transition Networks technical support at:
E-mail: [email protected]
Transition Networks
10900 Red Circle Drive
Minnetonka, MN 55344
United States of America
Telephone: [phone]
Fax: [phone]
http://www.transition.com
info@ Transition.com
© Copyright 2006 Transition Networks

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Table of Contents
1. INTRODUCTION....................................................................................................... 2
1-1. OVERVIEW OF SM24DPA............................................................................................ 2
1-2. CHECKLIST .................................................................................................................. 5
1-3. FEATURES.................................................................................................................... 5
1-4. FULL VIEW OF SM24DPA ........................................................................................... 8
1-4-1. User Interfaces on the Front Panel (Button, LEDs and Plugs).......................... 8
1-4-2. AC Power Input on the Rear Panel .................................................................... 9
1-5.VIEW OF THE OPTIONAL SFPMODULES ...................................................................... 9
2. INSTALLATION....................................................................................................... 10
2-1. STARTING SM24DPAUP........................................................................................... 10
2-1-1. Hardware and Cable Installation..................................................................... 10
2-1-2. Installing Chassis to a 19-Inch Wiring Closet Rail .......................................... 12
2-1-3. Cabling Requirements ...................................................................................... 12
2-1-3-1. Cabling Requirements for TP Ports.........................................................................12
2-1-3-3. Switch Cascading in Topology................................................................................12
2-1-4. Configuring the Management Agent of SM24DPA........................................... 16
2-1-4-1. Configuring the Management Agent of SM24DPA through the Serial RS-232 Port16
2-1-4-2. Configuring the Management Agent of SM24DPA through the Ethernet Port........18
2-1-5. IP Address Assignment ..................................................................................... 20
2-2. TYPICALAPPLICATIONS............................................................................................. 24
3. OPERATION OFWEB-BASED MANAGEMENT............................................... 26
3-1.WEB MANAGEMENT HOME OVERVIEW ..................................................................... 28
3-1-1. System Information........................................................................................... 31
3-1-2. Account Configuration ..................................................................................... 34
3-1-3. Time Configuration........................................................................................... 35
3-1-4. IP Configuration............................................................................................... 38
3-1-5. Loop Detection ................................................................................................. 41
3-1-6. Management Policy.......................................................................................... 42
3-1-7. Syslog ............................................................................................................... 45
3-1-8. System Log........................................................................................................ 46
3-1-9. Virtual Stack...................................................................................................... 47
3-2. PORT CONFIGURATION ............................................................................................... 49
3-2-1. Port Configuration ........................................................................................... 49
3-2-2.Port Status......................................................................................................... 51
3-2-3. Simple Counter................................................................................................. 54
3-2-4. Detail Counter.................................................................................................. 56
3-2-5. Power Saving.................................................................................................... 59
3-3.VLAN....................................................................................................................... 60
3-3-1. VLAN Mode...................................................................................................... 60
3-3-2. Tag-based Group .............................................................................................. 63
3-3-3. Port-based Group............................................................................................. 66
3-3-4. Ports................................................................................................................. 68
3-3-5. Port Isolation.................................................................................................... 70
3-3-6. Management VLAN........................................................................................... 71
3-4. MAC......................................................................................................................... 72
3-4-1. Mac Address Table............................................................................................ 72

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3-4-2. Static Filter....................................................................................................... 74
3-4-3. Static Forward.................................................................................................. 75
3-4-4. MAC Alias ........................................................................................................ 76
3-4-5. MAC Table........................................................................................................ 77
3-5. GVRP........................................................................................................................ 78
3-5-1. Config............................................................................................................... 78
3-5-2. Counter............................................................................................................. 81
3-5-3. Group................................................................................................................ 83
3-6. QOS(QUALITY OF SERVICE)CONFIGURATION ........................................................... 84
3-6-1. Ports................................................................................................................. 84
3-6-2. Qos Control List ............................................................................................... 86
3-6-3. Rate Limiters .................................................................................................... 91
3-6-4. Storm Control ................................................................................................... 92
3-6-5. Wizard............................................................................................................... 93
3-7. SNMPCONFIGURATION ...........................................................................................103
3-8.ACL .........................................................................................................................111
3-8-1. Ports................................................................................................................111
3-8-2. Rate Limiters ...................................................................................................113
3-8-3. Access Control List..........................................................................................114
3-8-4.Wizard...............................................................................................................143
3-9. IPMAC BINDING .....................................................................................................149
3-10. 802.1X CONFIGURATION ........................................................................................151
3-10-1.Server .............................................................................................................156
3-10-2.Port Configuration .........................................................................................158
3-10-3.Status ..............................................................................................................161
3-10-4. Statistics.........................................................................................................162
3-11.TACACS+..............................................................................................................163
3-11-1. State ...............................................................................................................163
3-11-2. Authentication................................................................................................164
3-11-3. Authorization .................................................................................................165
3-11-4. Accounting.....................................................................................................166
3-12. TRUNKING CONFIGURATION ...................................................................................167
3-12-1.Port.................................................................................................................168
3-12-2 Aggregator View.............................................................................................170
3-12-3 Aggregation Hash Mode.................................................................................171
3-12-4 LACP System Priority.....................................................................................172
3-13 STPCONFIGURATION ..............................................................................................173
3-13-1. Status .............................................................................................................173
3-13-2. Configuration ................................................................................................175
3-13-3. STP Port Configuration.................................................................................177
3-14 MSTP......................................................................................................................180
3-14-1. Status .............................................................................................................180
3-14-2. Region Config................................................................................................181
3-14-3. Instance View.................................................................................................182
3-15. MIRROR..................................................................................................................190
3-16. MULTICAST.............................................................................................................191
3-16-1. IGMP mode ...................................................................................................191
3-16-2. IGMP Proxy...................................................................................................192
3-16-3. IGMP Snooping.............................................................................................194
3-16-4. IGMP Group Allow........................................................................................195
3-16-5. IGMP Group Membership.............................................................................196
3-16-6. MVR...............................................................................................................197
3-16-7. MVID.............................................................................................................198
3-16-8. MVR Group Allow .........................................................................................199

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3-16-9. MVR Group Membership...............................................................................200
3-17.ALARM CONFIGURATION ........................................................................................201
3-17-1. Events ............................................................................................................202
3-17-2. Email .............................................................................................................203
3-18. DHCPSNOOPING ...................................................................................................204
3-18-1. DHCP Snooping State ...................................................................................204
3-18-2. DHCP Snooping Entry ..................................................................................205
3-18-3. DHCP Snooping Client .................................................................................206
3-19. LLDP.....................................................................................................................207
3-19-1. LLDP State ....................................................................................................207
3-19-2. LLDP Entry ...................................................................................................209
3-19-3. LLDP Statistics..............................................................................................211
3-20. SAVE/RESTORE .......................................................................................................213
3-20-1. Factory Defaults............................................................................................214
3-20-2. Save Start.......................................................................................................214
3-20-3. Save User.......................................................................................................214
3-20-4. Restore User..................................................................................................215
3-21. EXPORT/IMPORT.....................................................................................................216
3-22. DIAGNOSTICS .........................................................................................................217
3-22-1. Diag...............................................................................................................217
3-22-2. Ping ...............................................................................................................218
3-23. MAINTENANCE .......................................................................................................219
3-23-1. Warm Restart.................................................................................................219
3-23-2. Software Upload............................................................................................219
3-24. LOGOUT..................................................................................................................220
4. OPERATION OF CLI MANAGEMENT ..............................................................221
4-1. CLI MANAGEMENT ..................................................................................................221
4-1-1. Login................................................................................................................221
4-2. COMMANDS OF CLI..................................................................................................223
4-2-1. Global Commands of CLI................................................................................224
4-2-2. Local Commands of CLI..................................................................................229
5. MAINTENANCE..........................................................................................................330
5-1. RESOLVING NO LINK CONDITION .............................................................................330
5-2. Q&A ........................................................................................................................330
APPENDIX ATECHNICAL SPECIFICATIONS..........................................................331
APPENDIX B NULLMODEM CABLE SPECIFICATIONS.......................................335

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Revision History
Date Revision
03/01/2011 A0

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Warning:
Self-demolition on Product is strictly prohibited. Damage caused by self-
demolition will be charged for repairing fees.
Do not place product at outdoor or sandstorm.
Before installation, please make sure input power supply and product
specifications are compatible to each other.
To reduce the risk of electric shock. Disconnect all AC power cord to
completely remove power from the unit.
Before importing / exporting configuration please make sure the firmware
version is always the same.
After firmware upgrade, the switch will remove the configuration automatically
to latest firmware version.

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About this user’s manual
In this user manual, it will not only tell you how to install and connect your
network system but also how to configure and monitor the SM24DPA through the
built-in CLI through RS-232 serial interface and Web GUI. The hardware and
software functions are shown as well as the examples of the operation for web-
based interface and command-line interface (CLI).
Overview of this user’s manual
Chapter 1 “Introduction” describes the features of SM24DPA
Chapter 2 “Installation”
Chapter 3 “Operation of Web-based Management”
Chapter 4 “Operation of CLI Management”
Chapter 5 “Maintenance”

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1. Introduction
1-1. Overview of SM24DPA
SM24DPA, a 24-port all Fiber Managed Switch, is a standard switch that
meets all IEEE 802.3/u/x/z Gigabit, Fast Ethernet specifications. 16-Port (100/1000)
Dual Speed SFP and 8-Port Combo Gigabit RJ-45/ (100/1000) SFP management
Ethernet switch. The switch can be managed through RS-232 serial port via directly
connection, or through Ethernet port using CLI or Web-based management unit,
associated with SNMP agent. With the SNMP agent, the network administrator can
logon the switch to monitor, configure and control each port’s activity in a friendly
way. The overall network management is enhanced and the network efficiency is
also improved to accommodate high bandwidth applications. In addition, the switch
features comprehensive and useful functions such as QoS (Quality of Service),
Spanning Tree, VLAN, Port Trunking, Bandwidth Control, Port Security,
SNMP/RMON, IGMP Snooping capability via the intelligent software. It is suitable
for both metro-LAN and office applications.
Others the switch increase support the Power saving for reduce the power
consumption with "ActiPHY Power Management" and "PerfectReach Power
Management" two technique.It could efficient saving the switch power with auto
detect the client idle and cable length to provide different power.
In this switch, Port 1 and Port 8 include two types of media --- RJ-45 and
(100/1000) SFP Fiber (LC, BiDi LC…); this port supports 10/100/1000Mbps TP or
1000Mbps SFP Fiber with auto-detected function. (100/1000) SFP Fiber transceiver
is used for high-speed connection expansion
10/100/1000BASE-T is a standard Ethernet port that meets all IEEE
802.3/u/x/z Gigabit, Fast Ethernet specifications. (100/1000) SFP Fiber transceiver
is a Gigabit Ethernet port that fully complies with all IEEE 802.3z and 1000Base-
SX/LX standards and 100-FX standards.
1000Mbps Single Fiber WDM (BiDi) transceiver is designed with an optic
Wavelength Division Multiplexing (WDM) technology that transports bi-directional
full duplex signal over a single fiber simultaneously.
For upgrading firmware, please refer to the Section 3-21 or Section 4-2-2 for
more details. The switch will not stop operating while upgrading firmware and after
that, the configuration keeps unchanged.
The switch also supports the IEEE Standard──802.1AB （Link Layer
Discovery Protocol），Provide more easy debug tool and enhance the networking
management availability, Others it can provide auto-discovery device and topology
providing.

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• Key Features in the Device
QoS: Support Quality of Service by the IEEE 802.1P standard. There are two
priority queue and packet transmission schedule.
Spanning Tree:
Support IEEE 802.1D, IEEE 802.1w (RSTP: Rapid Spanning Tree
Protocol) standards.
VLAN:
Support Port-based VLAN and IEEE802.1Q Tag VLAN. Support VLAN ID
1~4094.
Port Trunking:
Support static port trunking and port trunking with IEEE 802.3ad LACP.
Bandwidth Control:
Support ingress and egress per port bandwidth control.
Port Security:
Support allowed, denied forwarding and port security with MAC address.
Link Layer Discovery Protocol (LLDP):
IEEE Standard──802.1AB （Link Layer Discovery Protocol），Provide
more easy debug tool and enhance the networking management availability,
Others it can provide auto-discovery device and topology providing
SNMP/RMON:
SNMP agent and RMON MIB. In the device, SNMP agent is a client
software which is operating over SNMP protocol used to receive the
command from SNMP manager (server site) and echo the corresponded
data, i.e. MIB object. Besides, SNMP agent will actively issue TRAP
information when happened.
RMON is the abbreviation of Remote Network Monitoring and is a branch of
the SNMP MIB.
The device supports MIB-2 (RFC 1213), Bridge MIB (RFC 1493), RMON
MIB (RFC 1757)-statistics Group 1,2,3,9, Ethernet-like MIB (RFC 1643),
Ethernet MIB (RFC 1643) and so on.
IGMP Snooping:
Support IGMP version 2 (RFC 2236): The function IGMP snooping is used
to establish the multicast groups to forward the multicast packet to the
member ports, and, in nature, avoid wasting the bandwidth while IP
multicast packets are running over the network.
IGMP Proxy:
The implementation of IP multicast processing. The switch supports IGMP
version 1 and IGMP version 2, efficient use of network bandwidth, and fast
response time for channel changing. IGMP version 1 (IGMPv1) is
described in RFC1112 ,and IGMP version 2 (IGMPv2) is described in RFC
2236. Hosts interact with the system through the exchange of IGMP
messages. Similarly, when you configure IGMP proxy, the system interacts

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with the router on its upstream interface through the exchange of IGMP
messages. However, when acting as the proxy, the system performs the
host portion of the IGMP task on the upstream interface as follows:
When queried, sends group membership reports to the
group.
When one of its hosts joins a multicast address group to
which none of its other hosts belong, sends unsolicited
group membership reports to that group.
When the last of its hosts in a particular multicast group
leaves the group, sends an unsolicited leave group
membership report to the all-routers group (244.0.0.2).
Power Saving:
The Power saving using the "ActiPHY Power Management" and
"PerfectReach Power Management" two techniques to detect the client idle
and cable length automatically and provides the different power. It could
efficient to save the switch power and reduce the power consumption.
Q-in-Q VLAN for performance & security:
The VLAN feature in the switch offers the benefits of both security and
performance. VLAN is used to isolate traffic between different users and
thus provides better security. Limiting the broadcast traffic to within the
same VLAN broadcast domain also enhances performance. Q-in-Q, the use
of double VLAN tags is an efficient method for enabling Subscriber
Aggregation. This is very useful in the MAN.
MVR: Multicast VLAN Registration (MVR) can support carrier to serve content
provider using multicast for Video streaming application in the network.
Each content provider Video streaming has a dedicated multicast VLAN.
The MVR routes packets received in a multicast source VLAN to one or
more receive VLANs. Clients are in the receive VLANs and the multicast
server is in the source VLAN.
Access Control List (ACL):
The ACLs are divided into EtherTypes. IPv4, ARP protocol, MAC and VLAN
parameters etc. Here we will just go over the standard and extended
access lists for TCP/IP. As you create ACEs for ingress classification, you
can assign a policy for each port, the policy number is 1-8, however, each
policy can be applied to any port. This makes it very easy to determine what
type of ACL policy you will be working with.
IP-MAC-Port Binding:
The IP network layer uses a four-byte address. The Ethernet link layer uses
a six-byte MAC address. Binding these two address types together allows
the transmission of data between the layers. The primary purpose of IP-
MAC binding is to restrict the access to a switch to a number of authorized
users. Only the authorized client can access the Switch’s port by checking
the pair of IP-MAC Addresses and port number with the pre-configured
database. If an unauthorized user tries to access an IP-MAC binding
enabled port, the system will block the access by dropping its packet.
DHCP Snooping:
This feature enables the DHCP Snooping to include information about client

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when forwarding DHCP requests from a DHCP client to a DHCP server via
Trust Port. DHCP snooping can be configured on LAN switches to harden
the security on the LAN to only allow clients with specific IP/MAC addresses
to have access to the network. In short, DHCP snooping ensures IP
integrity on a Layer 2 switched domain.
Multiple Spanning Tree Protocol:
The switch provides high link availability in multiple VLAN environments by
allowing multiple spanning trees and it encompasses IEEE 802.1D
Spanning Tree Protocol and IEEE 802.1w Rapid Spanning Tree Protocol.
For network reliability propose.
SSL and SSH for secure Management:
Secure Sockets Layer (SSL) supports the encryption for all HTTP traffic,
allowing secure access to the browser-based management GUI in the
switch. And Secure Shell (SSH) which supports the encryption for all
transmitted data for secure, remote command-line interface (CLI) access
over IP networks
Note: The SSL only provide the CLI for switch management and SSH
default enable without UI for management.
TACACS+:
The switch supports to ease switch management security administration by
using a password with Cisco TACACS+ authentication server
Syslog:
The Syslog is a standard for logging program messages . It allows
separation of the software that generates messages from the system that
stores them and the software that reports and analyzes them. It is
supported by a wide variety of devices and receivers across multiple
platforms.
1-2. Checklist
Before you start installing the switch, verify that the package contains the
following:
SM24DPA 16-Port 100/1000 Dual Speed SFP + 8-Port RJ-45/(100/1000M SFP)
Managed Switch
Mounting Accessory (for 19” Rack Shelf)
The User's Manual in CD-ROM
AC Power Cord
RS-232 Cable
Please notify your sales representative immediately if any of the aforementioned
items is missing or damaged.
1-3. Features
The SM24DPA, a standalone off-the-shelf switch, provides the
comprehensive features listed below for users to perform system network
administration and efficiently and securely serve your network.

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• Hardware
• 16 (100/1000) SFP Fiber ports
• 8 10/100/1000Mbps TP or (100/1000) SFP Fiber dual media auto sense
• SM24DPA supports AC Power Input
• 1392KB on-chip frame buffer
• Support jumbo frame up to 9K bytes
• Programmable classifier for QoS (Layer 4/Multimedia)
• 8K MAC address and 4K VLAN support (IEEE802.1Q)
• Per-port shaping, policing, and Broadcast Storm Control
• Power Saving with "ActiPHY Power Management" and "PerfectReach Power
Management" techniques.
• IEEE802.1Q Q-in-Q nested VLAN support
• Full-duplex flow control (IEEE802.3x) and half-duplex backpressure
• Extensive front-panel diagnostic LEDs; System: Power, TP Port1-8: LINK/ACT,
10/100/1000Mbps, SFP Port 1-24: SFP(LINK/ACT)
• Management
•Supports concisely the status of port and easily port configuration
•Supports per port traffic monitoring counters
• Supports a snapshot of the system Information when you login
• Supports port mirror function
• Supports the static trunk function
• Supports 802.1Q VLAN
• Supports user management and limits three users to login
• Maximal packet length can be up to 9600 bytes for jumbo frame application
• Supports DHCP Broadcasting Suppression to avoid network suspended or
crashed
• Supports to send the trap event while monitored events happened
• Supports Link Layer Discovery Protocol (LLDP)
•Supports default configuration which can be restored to overwrite the current
configuration which is working on via web browser and CLI
• Supports on-line plug/unplug SFP modules
• Supports Quality of Service (QoS) for real time applications based on the
information taken from Layer 2 to Layer 4, such as VoIP
• Built-in web-based management and CLI management, providing a more
convenient UI for the user
• Supports port mirror function with ingress/egress traffic
•Supports rapid spanning tree (802.1w RSTP)

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•Supports multiple spanning tree (802.1s MSTP)
• Supports SSL/SSH supports the encryption for all transmitted data for secure
• Supports ease switch management security administration by using a password
with Cisco TACACS+ authentication server
• Supports 802.1X port security on a VLAN
• Supports IP-MAC-Port Binding for LAN security
• Supports user management and only first login administrator can configure the
device. The rest of users can only view the switch
• SNMP access can be disabled and prevent from illegal SNMP access
• Supports Ingress, Non-unicast and Egress Bandwidth rating management with
a resolution of 1Mbps
• The trap event and alarm message can be transferred via e-mail
• Supports diagnostics to let administrator knowing the hardware status
•Supports loop detection to protect the switch crash when the networking has
looping issue
•HTTP and TFTP for firmware upgrade, system log upload and configuration file
import/export
• Supports remote boot the device through user interface and SNMP
• Supports NTP network time synchronization and daylight saving
• Supports 120 event log records in the main memory and display on the local
console
• Supports Syslog a standard for logging program messages and allows
separation of the software that generates messages from the system

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1-4. Full View of SM24DPA
1-4-1. User Interfaces on the Front Panel (Button, LEDs and Plugs)
There are 8 TP Gigabit Ethernet ports and 24 (100/1000) SFP fiber ports for
optional removable modules on the front panel of the switch. LED display area,
locating on the left side of the panel, contains a Power LED, which indicates the
power status and 24 ports working status of the switch. One RS-232 DB-9 interface
is offered for configuration or management.
• LED Indicators
Color Function
System LED
POWER Green Lit when 3.3V power is coming up
10/100/1000Ethernet TP Port 1 to 8 LED
LINK/ACT Green Lit when connection with remote device is good
Blinks when any traffic is present
10/100/1000Mbps Green/
Amber
Lit Green when TP link on 1000Mbps speed
Lit Amber when TP link on 100Mbps speed
Off when 10Mbps or no link occur
100/ 1000M FX/SX/LX Gigabit Fiber Port 1, 24 LED
LINK/ACT/SPD Green/
Amber
Blinks when any traffic is present
Lit Green when TP link on 1000Mbps speed
Lit Amber when TP link on 100Mbps speed
Off when no link occur
Table1-1
Fig. 1-1 Full View of SM24DPA
Fig. 1-2 Front View of SM24DPA
Power Indication LED Gi
g
abit Ethernet Port
RESET Button:
RESET button is used
to reset the
mana
g
ement s
y
stem.
SFP Fiber PortFiber Port Status Indication LEDs
RS-232 DB-9 Connector

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1-4-2. AC Power Input on the Rear Panel
One socket on the rear panel is forAC power input.
1-5. View of the Optional SFP Modules
Please visit our web page for the detail of the optional SFP modules:
http://www.transition.com/TransitionNetworks/Landing/SFP-XFP/SFP-XFP.aspx
Fig. 1-3 Rear View of SM24DPA
AC Line 100-240V 50/60 Hz
Redundant Power Supply
(RPS) Connector

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2. Installation
2-1. Starting SM24DPA
This section will give users a quick start for:
- Hardware and Cable Installation
- Management Station Installation
- Software booting and configuration
2-1-1. Hardware and Cable Installation
At the beginning, please do first:
Wear a grounding device to avoid the damage from electrostatic discharge
Be sure that power switch is OFF before you insert the power cord to power
source
• Installing Optional SFP Fiber Transceivers to the SM24DPA
Note: If you have no modules, please skip this section.
•Connecting the SFP Module to the Chassis:
The optional SFP modules are hot swappable, so you can plug or unplug it
before or after powering on.
1. Verify that the SFP module is the right model and conforms to the chassis
2. Slide the module along the slot. Also be sure that the module is properly
seated against the slot socket/connector
3. Install the media cable for network connection
4. Repeat the above steps, as needed, for each module to be installed into
slot(s)
5. Have the power ON after the above procedures are done
Fi
g
. 2-1 Installation of O
p
tional SFP Fiber Transceive
r

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• TP Port and Cable Installation
In the switch, TP port supports MDI/MDI-X auto-crossover, so both types of
cable, straight-through and crossed-over can be used. It means you do not have
to tell from them, just plug it.
Use Cat. 5 grade RJ-45 TP cable to connect to a TP port of the switch and the
other end is connected to a network-aware device such as a workstation or a
server.
Repeat the above steps, as needed, for each RJ-45 port to be connected to a
Gigabit 10/100/1000 TP device.
Now, you can start having the switch in operation.
•AC Power On ( SM24DPA only)
The switch supports 100-240 VAC, 50-60 Hz power supply. The power
supply will automatically convert the local AC power source to DC power. It does not
matter whether any connection plugged into the switch or not when power on, even
modules as well. After the power is on, all LED indicators will light up immediately
and then all off except the power LED still keeps on. This represents a reset of the
system.
• Firmware Loading
After resetting, the bootloader will load the firmware into the memory. It will
take about 30 seconds, after that, the switch will flash all the LED once and
automatically performs self-test and is in ready state.

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2-1-2. Installing Chassis to a 19-Inch Wiring Closet Rail
Caution: Allow a proper spacing and proper air ventilation for the cooling fan
at both sides of the chassis.
Wear a grounding device for electrostatic discharge.
Screw the mounting accessory to the front side of the switch (See Fig. 2-2).
Place the Chassis into the 19-inch wiring closet rail and locate it at the proper
position. Then, fix the Chassis by screwing it.
2-1-3. Cabling Requirements
To help ensure a successful installation and keep the network performance
good, please take a care on the cabling requirement. Cables with worse
specification will render the LAN to work poorly.
2-1-3-1. Cabling Requirements for TP Ports
For Fast Ethernet TP network connection
The grade of the cable must be Cat. 5 or Cat. 5e with a maximum length of
100 meters.
Gigabit Ethernet TP network connection
The grade of the cable must be Cat. 5 or Cat. 5e with a maximum length of
100 meters. Cat. 5e is recommended.
2-1-3-3. Switch Cascading in Topology
• Takes the Delay Time into Account
Theoretically, the switch partitions the collision domain for each port in switch
cascading that you may up-link the switches unlimitedly. In practice, the network
extension (cascading levels & overall diameter) must follow the constraint of the
IEEE 802.3/802.3u/802.3z and other 802.1 series protocol specifications, in which
the limitations are the timing requirement from physical signals defined by 802.3
series specification of Media Access Control (MAC) and PHY, and timer from some
Fig. 2-2