Moxa Technologies PT-7828, PowerTrans PT-7828 User Manual
Moxa PowerTrans Switch
PT-7828 User’s Manual
www.moxa.com/product
Third Edition, September 2010
© 2010 Moxa Inc. All rights reserved.
Reproduction without permission is prohibited.
Moxa PowerTrans Switch
PT-7828 User’s Manual
The software described in this manual is furnished under a license agreement and may be used only in
accordance with the terms of that agreement.
Copyright Notice
Copyright © 2010 Moxa Inc.
All rights reserved.
Reproduction without permission is prohibited.
Trademarks
MOXA is a registered trademark of Moxa Inc.
All other trademarks or registered marks in this manual belong to their respective manufacturers.
Disclaimer
Information in this document is subject to change without notice and does not represent a commitment on the
part of Moxa.
Moxa provides this document “as is,” without warranty of any kind, either expressed or implied, including, but
not limited to, its particular purpose. Moxa reserves the right to make improvements and/or changes to this
manual, or to the products and/or the programs described in this manual, at any time.
Information provided in this manual is intended to be accurate and reliable. However, Moxa assumes no
responsibility for its use, or for any infringements on the rights of third parties that may result from its use.
This product might include unintentional technical or typographical errors. Changes are periodically made to the
information herein to correct such errors, and these changes are incorporated into new editions of the
publication.
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Table of Contents
Chapter 1 Introduction ............................................................................................... 1-1
Overview .............................................................................................................................. 1-2
Package Checklist ................................................................................................................. 1-2
Software Features ................................................................................................................. 1-2
Chapter 2 Getting Started .......................................................................................... 2-1
Serial Console Configuration (115200, None, 8, 1, VT100) ................................................ 2-2
Configuration by Telnet Console .......................................................................................... 2-5
Configuration by Web Browser ............................................................................................ 2-7
Disabling Telnet and Browser Access .................................................................................. 2-9
Chapter 3 Featured Functions ................................................................................... 3-1
Configuring Basic Settings ................................................................................................... 3-3
System Identification ................................................................................................. 3-3
Password ................................................................................................................... 3-4
Accessible IP ............................................................................................................. 3-5
Port ............................................................................................................................ 3-6
Network ..................................................................................................................... 3-7
Time .......................................................................................................................... 3-9
Daylight Saving Time ............................................................................................... 3-9
IEEE 1588 PTP................................................................................................................... 3-10
How Does an Ethernet Switch Affect 1588 Synchronization? ............................................ 3-11
PTP Setting ......................................................................................................................... 3-12
System File Update—By Remote TFTP ................................................................. 3-13
System File Update—By Local Import/Export ....................................................... 3-14
System File Update - By Backup Media ................................................................. 3-15
Restart ..................................................................................................................... 3-15
Factory Default ........................................................................................................ 3-15
Using Port Trunking ........................................................................................................... 3-16
The Port Trunking Concept ..................................................................................... 3-16
Configuring Port Trunking ...................................................................................... 3-17
Configuring SNMP ............................................................................................................. 3-18
SNMP Read/Write Settings ..................................................................................... 3-19
Trap Settings ........................................................................................................... 3-21
Private MIB information ......................................................................................... 3-22
Using Communication Redundancy ................................................................................... 3-22
The Turbo Ring Concept ......................................................................................... 3-23
Configuring Turbo Ring and Turbo Ring V2 .......................................................... 3-27
The Turbo Chain Concept ................................................................................................... 3-31
Configuring “Turbo Chain” ................................................................................................ 3-32
Head Switch Configuration ..................................................................................... 3-32
Member Switch Configuration ................................................................................ 3-33
Tail Switch Configuration ....................................................................................... 3-33
Explanation of “Current Status” Items .................................................................... 3-33
The STP/RSTP Concept .......................................................................................... 3-34
Configuring STP/RSTP ........................................................................................... 3-40
Using Traffic Prioritization ................................................................................................. 3-42
The Traffic Prioritization Concept .......................................................................... 3-42
Configuring Traffic Prioritization ........................................................................... 3-45
Using Virtual LAN ............................................................................................................. 3-47
The Virtual LAN (VLAN) Concept ........................................................................ 3-47
Sample Applications of VLANs using PT-7828 ..................................................... 3-49
Configuring Virtual LAN ........................................................................................ 3-50
Using Multicast Filtering .................................................................................................... 3-52
The Concept of Multicast Filtering ......................................................................... 3-52
Configuring IGMP Snooping .................................................................................. 3-55
Add Static Multicast MAC ...................................................................................... 3-56
Configuring GMRP ................................................................................................. 3-57
GMRP Table ........................................................................................................... 3-57
Using Bandwidth Management .......................................................................................... 3-58
Broadcast Storm Protection ..................................................................................... 3-58
Traffic Rate Limiting Settings ................................................................................. 3-58
Using Port Access Control .................................................................................................. 3-59
Configuring Static Port Lock .................................................................................. 3-60
Configuring IEEE 802.1X ....................................................................................... 3-60
Using IP Filter .................................................................................................................... 3-63
Using Auto Warning ........................................................................................................... 3-63
Configuring Email Warning .................................................................................... 3-63
Event Type .............................................................................................................. 3-64
Email Setup ............................................................................................................. 3-65
Configuring Relay Warning .................................................................................... 3-66
Event Setup ............................................................................................................. 3-67
Warning List ............................................................................................................ 3-68
Using Line-Swap-Fast-Recovery........................................................................................ 3-68
Configuring Line-Swap Fast Recovery ................................................................... 3-68
Using Set Device IP ............................................................................................................ 3-68
Configuring Set Device IP ...................................................................................... 3-69
DHCP Relay Agent (Option 82) ......................................................................................... 3-70
Using Diagnosis .................................................................................................................. 3-72
Mirror Port .............................................................................................................. 3-72
Ping ......................................................................................................................... 3-73
LLDP Function Overview .................................................................................................. 3-73
LLDP Web Interface ............................................................................................... 3-74
LLDP Settings ......................................................................................................... 3-74
LLDP Table ............................................................................................................. 3-74
Using Monitor .................................................................................................................... 3-75
Monitor by Switch ................................................................................................... 3-75
Monitor by Port ....................................................................................................... 3-75
Using the MAC Address Table ........................................................................................... 3-76
Using System Log .............................................................................................................. 3-77
Event Log ................................................................................................................ 3-77
Syslog ...................................................................................................................... 3-78
Using HTTPS/SSL ............................................................................................................. 3-79
Using Layer 3 Settings ....................................................................................................... 3-80
The Layer-3 Switching Concept .............................................................................. 3-80
Interface Setting ...................................................................................................... 3-81
RIP .......................................................................................................................... 3-82
OSPF Settings ..................................................................................................................... 3-83
OSPF Global Settings .............................................................................................. 3-83
OSPF Area Settings ................................................................................................. 3-84
OSPF Interface Settings .......................................................................................... 3-85
OSPF Virtual Link Settings ..................................................................................... 3-86
OSPF Area Aggregation Settings ............................................................................ 3-87
OSPF Neighbor Table ............................................................................................. 3-87
VRRP Settings ........................................................................................................ 3-88
Static Route ............................................................................................................. 3-89
Routing Table .......................................................................................................... 3-90
Using System Log .............................................................................................................. 3-90
Event Log ................................................................................................................ 3-90
Syslog Settings ........................................................................................................ 3-91
Using HTTPS/SSL ............................................................................................................. 3-92
Appendix A MIB Groups ............................................................................................... A-1
Appendix B Specifications ........................................................................................... B-1
Appendix C Modbus/TCP Map ..................................................................................... C-1
1
1
Chapter 1 Introduction
Welcome to the PowerTrans PT-7828, a managed redundant Gigabit Ethernet switch designed
especially for connecting Ethernet-enabled devices for industrial field applications.
The following topics are covered in this chapter:
Overview
Package Checklist
Software Features
PT-7828 User’s Manual Introduction
1-2
Overview
The PowerTrans PT-7828 is certified for use in power substation automation systems (IEC
61850-3, IEEE 1613), traffic control systems (NEMA TS 2), and railway applications
(EN50121-4). It can be used for Gigabit or Fast Ethernet backbones and supports redundant ring
topologies. It also supports dual power inputs (24/48 VDC or 110/220 VDC/VAC) to increase the
reliability of communication.
The PT-7828 has a modular design that makes network planning easy and allows greater flexibility.
You can install up to 4 Gigabit Ethernet ports and 24 Fast Ethernet ports. Optional front or rear
wiring makes the PT-7828 suitable for different applications.
Package Checklist
The PowerTrans PT-7828 is shipped with the following items. If any of these items is missing or
damaged, please contact your customer service representative for assistance.
y 1 PowerTrans PT-7828
y Hardware installation guide
y CD-ROM with user’s manual and SNMP MIB file
y Warranty statement
y RJ45-to-DB9 console port cable
y Protective caps for unused ports
y 2 rackmount attachments
Software Features
y Static routing and RIP V1/V2 supported
y Turbo Ring, Turbo Chain, and RSTP/STP (IEEE 802.1W/D)
y VRRP ensures redundant routing paths
y IEEE 1588 PTP (Precision Time Protocol) for precise time synchronization of networks
y DHCP Option 82 for IP address assignment for different policies
y Supports Modbus TCP for easy integration in HMI
y Supports LLDP (Link Layer Discovery Protocol)
y Redundant Gigabit Turbo Ring, RSTP/STP (IEEE 802.1w/D), and Turbo Chain
y IGMP snooping, GMRP to filter multicast traffic from industrial Ethernet protocols
y IEEE 802.1Q VLAN, GVRP for easier network planning
y QoS-IEEE 802.1p/1Q and TOS/DiffServ to increase determinism
y 802.3ad, LACP for bandwidth optimization
y IEEE 802.1X and https/SSL to enhance network security
y SNMP V1/V2c/V3 for differential network management
y RMON for efficient, proactive network monitoring
y Supports ABC-01 for system configuration backup
y Access restriction by MAC address
y Port mirroring for online debugging
y Automatic warnings by email, relay output
y Automatic recovery of connected device’s IP addresses
y Line-swap fast recovery
y Configuration through web browser, Telnet/serial console, Windows utility, and ABC-01
2
2
Chapter 2 Getting Started
This chapter explains how the initial installation process for the PT-7828. There are three ways to
access PT-7828’s configuration settings: the serial console, Telnet console, and web console. If
you do not know the PT-7828’s IP address, you can open the serial console by connecting the
PT-7828 to a PC’s COM port with a short serial cable. You can open the Telnet or web console
over an Ethernet LAN or over the Internet.
The following topics are covered:
Serial Console Configuration (115200, None, 8, 1, VT100)
Configuration by Telnet Console
Configuration by Web Browser
Disabling Telnet and Browser Access
PT-7828 User’s Manual Getting Started
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Serial Console Configuration (115200, None, 8, 1, VT100)
NOTE
y You cannot connect to the serial and Telnet console at the same time.
y You can connect to the web console and another console (serial or Telnet) at the same time.
However, it is strongly recommended that you do NOT do so. Following this advice will
allow you to maintain better control over the PT-7828’s configuration.
NOTE
We recommend using PComm Terminal Emulator when opening the serial console. This
software can be downloaded free of charge from the Moxa website.
Before running PComm Terminal Emulator, use an RJ45 to DB9-F (or RJ45 to DB25-F) cable to
connect the PT-7828’s console port to your PC’s COM port (generally COM1 or COM2,
depending on how your system is set up).
After installing PComm Terminal Emulator, open the PT-7828’s serial console as follows:
1. From the Windows desktop, click Start Æ Programs Æ PComm Lite 1.3 Æ Terminal
Emulator.
2. Select Open under the Port Manager menu to open a new connection.
PT-7828 User’s Manual Getting Started
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3. The Property window should open. On the Communication Parameter tab for Ports, select
the COM port that is being used for the console connection. Set the other fields as follows:
115200 for Baud Rate, 8 for Data Bits, None for Parity, and 1 for Stop Bits.
4. On the Terminal tab, select VT100 for Terminal Type. Click OK.
5. In the terminal window, the PT-7828 will prompt you to select a terminal type. Enter 1 to
select ansi/vt100 and press Enter.
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6. The serial console will prompt you to log in. Press Enter and select admin or user. Use the
down arrow key on your keyboard to select the Password field and enter a password if
desired. This password will be required to access any of the consoles (web, serial, Telnet). If
you do not wish to create a password, leave the Password field blank and press Enter.
7. The Main Menu of the PT-7828’s serial console should appear. (In PComm Terminal
Emulator, you can adjust the font by selecting Font… in the Edit menu.)
8. Use the following keys on your keyboard to navigate the PT-7828’s serial console:
Key Function
Up, down, right, left arrow keys
Tab
Move the onscreen cursor
Enter Display and select options
Space Toggle options
Esc Previous menu
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Configuration by Telnet Console
You may open the PT-7828’s Telnet or web console over a network. This requires that the PC host
and PT-7828 are on the same logical subnet. You may need to adjust your PC host’s IP address
and subnet mask. By default, the PT-7828’s IP address is 192.168.127.253 and PT-7828’s subnet
mask is 255.255.255.0 (for a Class C network). This means that your PC’s IP address must be set
to 192.168.xxx.xxx for a subnet mask of 255.255.0.0, or to 192.168.127.xxx with a subnet mask of
255.255.255.0.
NOTE
To connect to the PT-7828’s Telnet or web console, your PC host and the PT-7828 must be on
the same logical subnet.
NOTE
When connecting to the PT-7828’s Telnet or web console, first connect one of PT-7828’s
Ethernet ports to your Ethernet LAN or directly to your PC’s Ethernet port. You may use either a
straight-through or cross-over Ethernet cable.
NOTE
The PT-7828’s default IP address is 192.168.127.253.
After making sure that the PT-7828 is connected to the same LAN and logical subnet as your PC,
open the PT-7828’s Telnet console as follows:
1. Click Start Æ Run from the Windows Start menu. Telnet to the PT-7828’s IP address from
the Windows Run window. You may also issue the Telnet command from a DOS prompt.
2. In the terminal window, the Telnet console will prompt you to select a terminal type. Type 1
to choose ansi/vt100, and then press Enter.
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3. The Telnet console will prompt you to log in. Press Enter and select admin or user. Use the
down arrow key on your keyboard to select the Password field and enter a password if
desired. This password will be required to access any of the consoles (web, serial, Telnet). If
you do not wish to create a password, leave the Password field blank and press Enter.
4. The Main Menu of the PT-7828’s Telnet console should appear.
5. In the terminal window, select Preferences… from the Terminal menu on the menu bar.
6. The Terminal Preferences window should appear. Make sure that VT100 Arrows is
checked.
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7. Use the following keys on your keyboard to navigate the PT-7828’s Telnet console:
Key Function
Up, down, right, left arrow keys
Tab
Move the onscreen cursor
Enter Display and select options
Space Toggle options
Esc Previous menu
NOTE
The Telnet console looks and operates in precisely the same manner as the serial console.
Configuration by Web Browser
The PT-7828’s web console is a convenient way to modify the configuration and access the
built-in monitoring and network administration functions. You can open the PT-7828’s web
console using a standard web browser such as Internet Explorer or Netscape.
NOTE
To connect to the PT-7828’s Telnet or web console, your PC host and the PT-7828 must be on
the same logical subnet.
NOTE
If the PT-7828 is configured for other VLAN settings, you must make sure your PC host is on the
management VLAN.
NOTE
When connecting to the PT-7828’s Telnet or web console, first connect one of PT-7828’s
Ethernet ports to your Ethernet LAN or directly to your PC’s Ethernet port. You may use either a
straight-through or cross-over Ethernet cable.
NOTE
The PT-7828’s default IP address is 192.168.127.253.
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After making sure that the PT-7828 is connected to the same LAN and logical subnet as your PC,
open the PT-7828’s web console as follows:
1. Point your web browser to the PT-7828’s IP address by entering it in the Address or URL
field.
2. The PT-7828’s web console will open, and you will be prompted to log in. Select the login
account (admin or user) and enter the Password. This password will be required to access any
of the consoles (web, serial, Telnet). If you do not wish to create a password, leave the
Password field blank and press Enter.
NOTE
By default, no password is assigned to the PT-7828’s web, serial, and Telnet consoles.
3. After logging in, you may need to wait a few moments for the web console to appear. Use the
folders in the left navigation panel to navigate between different pages of configuration
options.
PT-7828 User’s Manual Getting Started
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Disabling Telnet and Browser Access
If you are connecting the PT-7828 to a public network but do not intend to manage it over the
network, we suggest disabling both the Telnet and web consoles. This is done through the serial
console, by navigating to System Identification under Basic Settings. Disable or enable the
Telnet Console and Web Configuration as shown below:
3
3
Chapter 3 Featured Functions
This chapter explains how to access PT-7828’s various configuration, monitoring, and
administration functions. These functions can be accessed by serial, Telnet, or web console. The
serial console can be used if you do not know PT-7828’s IP address and requires that you connect
the PT-7828 to a PC COM port. The Telnet and web consoles can be opened over an Ethernet
LAN or the Internet.
The web console is the most user-friendly way to configure PT-7828. In this chapter, we use the
web console interface to introduce the functions. There are only a few differences between the web
console, serial console, and Telnet console.
The following topics are covered in this chapter:
Configuring Basic Settings
IEEE 1588 PTP
How Does an Ethernet Switch Affec
t 1588 Synchronization?
PTP Setting
Using Port Trunking
Configuring SNMP
Using Communication Redundancy
The Turbo Chain Concept
Configuring “Turbo Chain”
Using Traffic Prioritization
Using Virtual LAN
Using Multicast Filtering
Using Bandwidth Management
Using Port Access Control
Using IP Filter
Using Auto Warning
Using Line-Swap-Fast-Recovery
Using Set Device IP
DHCP Relay Agent (Option 82)
Using Diagnosis
LLDP Function Overview
Using Monitor
Using the MAC Address Table
PT-7828 User’s Manual Featured Functions
3-2
Using System Log
Using HTTPS/SSL
Using Layer 3 Settings
OSPF Settings
Using System Log
Using HTTPS/SSL
PT-7828 User’s Manual Featured Functions
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Configuring Basic Settings
Basic Settings includes the most common settings required by administrators to maintain and
control the PT-7828.
System Identification
System Identification items are displayed at the top of the web console and will be included in
alarm emails. You can set the System Identification items to make it easier to identify different
switches that are connected to your network.
Switch Name
Setting Description Factory Default
Max. 30
characters
This option is useful for differentiating between
the roles or applications of different units.
Example: Factory Switch 1.
Managed Redundant Switch
[Serial no. of this switch]
Switch Location
Setting Description Factory Default
Max. 80
characters
This option is useful for differentiating between
the locations of different units. Example:
production line 1.
Switch Location
Switch Description
Setting Description Factory Default
Max. 30
characters
This option is useful for recording a more
detailed description of the unit.
None
Maintainer Contact Info
Setting Description Factory Default
Max. 30
characters
This option is useful for providing information
about who is responsible for maintaining this
unit and how to contact this person.
None
PT-7828 User’s Manual Featured Functions
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Password
The PT-7828 provides two levels of configuration access. The admin account has read/write
access of all configuration parameters, and the user account has read access only. The user
account can only view the configuration, but will not be able to make modifications.
ATTENTION
By default, no password is assigned to the PT-7828’s web, Telnet, and serial consoles. If a
password is assigned, you will be required to enter the password when you open the serial
console, Telnet console, or Web console.
Account
Setting Description Factory Default
Admin This account can modify the PT-7828’s
configuration.
admin
User This account can only view the PT-7828’s
configurations.
Password
Setting Description Factory Default
Old password
(max. 16 characters)
Enter the current password None
New password
(Max. 16 characters)
Enter the desired new password. Leave it blank if
you want to remove the password.
None
Retype password
(Max. 16 characters)
Enter the desired new password again. Leave it
blank if you want to remove the password.
None
PT-7828 User’s Manual Featured Functions
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Accessible IP
The PT-7828 uses an IP address-based filtering method to control access.
You may add or remove IP addresses to limit access to the PT-7828. When the accessible IP list is
enabled, only addresses on the list will be allowed access to the PT-7828. Each IP address and
netmask entry can be tailored for different situations:
y Grant access to one host with a specific IP address
For example, enter IP address 192.168.1.1 with netmask 255.255.255.255 to allow access to
192.168.1.1 only.
y Grant access to any host on a specific subnetwork
For example, enter IP address 192.168.1.0 with netmask 255.255.255.0 to allow access to all
IPs on the subnet defined by this IP address/subnet mask combination.
y Grant acces to all hosts
Make sure the accessible IP list is not enabled. Remove the checkmark from Enable the
accessible IP list.
The following table shows additional configuration examples:
Hosts That Need Access Input Format
Any host Disable
192.168.1.120 192.168.1.120 / 255.255.255.255
192.168.1.1 to 192.168.1.254 192.168.1.0 / 255.255.255.0
192.168.0.1 to 192.168.255.254 192.168.0.0 / 255.255.0.0
192.168.1.1 to 192.168.1.126 192.168.1.0 / 255.255.255.128
192.168.1.129 to 192.168.1.254 192.168.1.128 / 255.255.255.128
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Port
Port settings are included to give the user control over port access, port transmission speed, flow
control, and port type (MDI or MDIX).
Enable
Setting Description Factory Default
Checked This allows data transmission through the port.
Enabled
Unchecked This immediately shuts off port access.
ATTENTION
If a connected device or sub-network is wreaking havoc on the rest of the network, the Disable
option under Advanced Settings/Port gives the administrator a quick way to shut off access
through this port immediately.
Description
Setting Description Factory Default
Media type This displays the media type for each module’s
port
N/A
Name
Setting Description Factory Default
Max. 63 characters This specifies an alias for the port to help
administrators differentiate between different
ports. Example: PLC 1
None
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Speed
Setting Description Factory Default
Auto This allows the port to use the IEEE 802.3u
protocol to negotiate with connected devices. The
port and connected devices will determine the
best speed for that connection.
Auto
100M-Full Choose one of these fixed speed options if the
connected Ethernet device has trouble
auto-negotiating for line speed.
100M-Half
10M-Full
10M-Half
FDX Flow Ctrl
This setting enables or disables flow control for the port when the port's Speed is set to Auto. The
final result will be determined by the Auto process between the PT-7828 and connected devices.
Setting Description Factory Default
Enable This enables flow control for this port when the
port's Speed is set to Auto.
Disable
Disable This disables flow control for this port when the
port's Speed is set to Auto.
MDI/MDIX
Setting Description Factory Default
Auto This allows the port to auto-detect the port type of
the connected Ethernet device and change the
port type accordingly.
Auto
MDI Choose MDI or MDIX if the connected Ethernet
device has trouble auto-negotiating for port type.
MDIX
Network
Network settings allow users to modify the usual TCP/IP network parameters.
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Auto IP Configuration
Setting Description Factory Default
Disable Select this to set the PT-7828’s IP address
manually.
Disable
By DHCP The PT-7828’s IP address will be assigned
automatically by the network’s DHCP server.
By BootP The PT-7828’s IP address will be assigned
automatically by the network’s BootP server.
Switch IP Address
Setting Description Factory Default
IP address for the PT-7828 This assigns the PT-7828’s IP address on a
TCP/IP network.
192.168.127.253
Switch Subnet Mask
Setting Description Factory Default
Subnet mask for the
PT-7828
This identifies the type of network to which the
PT-7828 is connected (e.g., 255.255.0.0 for a
Class B network, or 255.255.255.0 for a Class
C network).
255.255.255.0
Default Gateway
Setting Description Factory Default
IP address for gateway This specifies the IP address of the router that
connects the LAN to an outside network.
None
DNS IP Address
Setting Description Factory Default
IP address for DNS server This specifies the IP address of the DNS server
used by your network. After specifying the
DNS server’s IP address, you can use the
PT-7828’s URL (e.g., www.PT.company.com)
to ope
n the web console instead of entering the
IP address.
None
IP address for 2nd DNS
server
This specifies the IP address of the secondary
DNS server used by your network. The
PT-7828 will use the secondary DNS server if
the first DNS server fails to connect.
None
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Time
The PT-7828 has a time calibration function based on information from an NTP server or user
specified time and date. Functions such as automatic warning emails can therefore include time
and date stamp.
NOTE
The PT-7828 does not have a real time clock. The user must update the Current Time and
Current Date to set the initial time for PT-7828 after each reboot, especially when there is no
N
TP server on the LAN or Internet connection.
Current Time
Setting Description Factory Default
User-specified time This allows configuration of the local time in
local 24-hour format.
00h:00m:00s
Current Date
Setting Description Factory Default
User-specified date This allows configuration of the local date in
yyyy-mm-dd format.
1970/01/01
Daylight Saving Time
The Daylight Saving Time settings are used to automatically offset the PT-7828’s time forward
according to national standards.
Start Date
Setting Description Factory Default
User-specified date This specifies the date that Daylight Savings
Time begins.
None
End Date
Setting Description Factory Default
User-specified date This specifies the date that Daylight Savings
Time ends.
None
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Offset
Setting Description Factory Default
User-specified hour This specifies the number of hours that the time
should be offset forward during Daylight
Savings Time.
None
System Up Time
This indicates how long the PT-7828 remained up since the last cold start. The up time is indicated
in seconds.
Time Zone
Setting Description Factory Default
Time zone This specifies the time zone, which is used to
determine the local time offset from GMT
(Greenwich Mean Time).
GMT (Greenwich
Mean Time)
NOTE
Changing the time zone will automatically correct the current time. Make sure to set the time
zone before setting the time.
Time Server IP/Name
Setting Description Factory Default
IP address or name of time
server
This is the IP or domain address (e.g.,
192.168.1.1, time.stdtime.gov.tw, or
time.nist.gov).
None
IP address or name of
secondary time server
The PT-7828 will try to locate the secondary
NTP server if the first NTP server fails to
connect.
Time Server Query Period
Setting Description Factory Default
Query period This parameter determines how frequently the
time is updated from the NTP server.
600 seconds
IEEE 1588 PTP
The following information is taken from the NIST website at http://ieee1588.nist.gov/intro.htm:
Time measurement can be accomplished using the IEEE Standard for a Precision Clock
Synchronization Protocol for Networked Measurement and Control Systems (IEEE 1588-2008) to
synchronize real-time clocks incorporated within each component of the electrical power system
for power automation applications.
IEEE 1588, which was published in November 2002, expands the performance capabilities of
Ethernet networks to control systems that operate over a communication network. In recent years
an increasing number of electrical power systems have been using a more distributed architecture
with network technologies that have less stringent timing specifications. IEEE 1588 generates a
master-slave relationship between the clocks, and enforces the specific timing requirements in
such power systems. All devices ultimately get their time from a clock known as the grandmaster
clock. In its basic form, the protocol is intended to be administration free.
PT-7828 User’s Manual Featured Functions
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How Does an Ethernet Switch Affect 1588
Synchronization?
The following content is taken from the NIST website at http://ieee1588.nist.gov/switch.htm:
An Ethernet switch potentially introduces multi-microsecond fluctuations in the latency between
the 1588 grandmaster clock and a 1588 slave clock. Uncorrected these fluctuations will cause
synchronization errors. The magnitude of these fluctuations depend on the design of the Ethernet
switch and the details of the communication traffic. Experiments with prototype implementations
of IEEE 1588 indicate that with suitable care the effect of these fluctuations can be successfully
managed. For example, use of appropriate statistics in the 1588 devices to recognized significant
fluctuations and use suitable averaging techniques in the algorithms controlling the correction of
the local 1588 clock will be the good design means to achieve the highest time accuracy.
Can Ethernet switches be designed to avoid the effects of these fluctuations?
A switch may be designed to support IEEE 1588 to avoide the effects of queuing. In this case two
modifications to the usual design of an Ethernet switch are necessary:
z The Boundary Clock functionality defined by IEEE 1588 must be implemented in the switch
z The switch must be configured such that it does not pass IEEE 1588 message traffic using the
normal communication mechanisms of the switch.
Such an Ethernet switch will synchronize clocks directly connected to one of its ports to the
highest possible accuracy.
S
S
S
M
S
M
M
M
Grandmaster
Clock:
Determines the
time base for the
system
Boundary Clock:
Slave to the
grandmaster clock
and master to its
slave
Ordinary Clock:
Slave to its master
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PTP Setting
Operation IEEE 1588/PTP
Setting Description Factory Default
Operation Disable or enable IEEE 1588(PTP) operation Disable
Configuration IEEE 1588/PTP
Setting Description Factory Default
Clock Mode Support software-based IEEE 1588(PTP) mode Disable
Sync Interval Period for sending synchronization message (in
seconds)
Disable
Sub-domain Name Support _DFLT(Default) domain only _DFLT
Status
Setting Description Factory Default
Offset To Master (nsec) Deviation between local time and the reference
clock (in nanoseconds).
Grandmaster UUID When the clock has a port in PTP_SLAVE
state, this member’s value is the value of the
grand master clock's Uuid field of the last Sync
message received from the parent of the slave
port.
Parent UUID When the clock has a port in PTP_SLAVE
state, this member’s value is the value of the
source-Uuid field of the last Sync message
received from the parent of the slave port.
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Clock Stratum The stratum number describes one measure of
the quality of a clock. Each clock is
characterized by a stratum number used by the
best master clock algorithm as one parameter of
clock quality.
4
Clock Identifier Properties of the clock. DFLT
PTP Port Settings
Setting Description Factory Default
Port Enable Enable or disable PTP port operation. None
Port Status Display PTP port real status. PTP_DISABLED
System File Update—By Remote TFTP
The PT-7828 supports saving your configuration or log file to a remote TFTP server or local host.
Other PT-7828 switches can also load the configuration at a later time. The PT-7828 also supports
loading firmware or configuration files from the TFTP server or a local host.
TFTP Server IP/Name
Setting Description Factory Default
IP address of TFTP
server
This specifies the IP address or name of the remote
TFTP server. This must be specified before
downloading or uploading files.
None
Configuration Files Path and Name
Setting Description Factory Default
Max. 40 characters This specifies the path and file name of the
PT-7828’s configuration file on the TFTP server.
None
Firmware Files Path and Name
Setting Description Factory Default
Max. 40 characters This specifies the path and file name of the
PT-7828’s firmware file.
None
Log Files Path and Name
Setting Description Factory Default
Max. 40 characters This specifies the path and file name of the
PT-7828’s log file.
None
PT-7828 User’s Manual Featured Functions
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After setting the desired paths and file names, click Activate to save the setting. Click Download
to download the prepared file from the remote TFTP server, or click Upload to upload the desired
file to the remote TFTP server.
System File Update—By Local Import/Export
Configuration File
Click Export to save the PT-7828’s configuration file to the local host.
Log File
Click Export to save the PT-7828’s log file to the local host.
NOTE
Some operating systems will open the configuration file and log file directly in the web page. In
such cases, right click the Export button to save the file.
Upgrade Firmware
To import a new firmware file onto the PT-7828, click Browse to select the firmware file that is
saved on your computer. The upgrade procedure will proceed automatically after clicking Import.
Upload Configure Data
To import a configuration file onto the PT-7828, click Browse to select the configuration file
already saved on your computer. The upgrade procedure will proceed automatically after clicking
Import.
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