ND-
SERIES
NET
WORK TIME PROTOCOL
CLOCK - DATE
DISPLAY
(Series II)
Symmetricom, Inc. Tel: 707-528-1230
Santa Rosa, CA 95403 Sep-08 Printed in USA
USER MANUAL
DISCLAIMER
The information contained in this document is subject to change without notice. Symmetricom, Inc. (hereinafter
SYMMETRICOM) makes no warranty of any kind with regard to this material, including, but not limited to, the implied
warranties of merchantability and fitness for a particular purpose. SYMMETRICOM shall not be liable for errors contained
here in or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.
See important limited warranty at the end of this document.
Table Of Contents
Intr
oduction ................................................................................................................................................................................. 1
Installation ...................................................................................................................................................................................2
Operating Environment............................................................................................................................................................2
Pre-Installation Checklist.........................................................................................................................................................2
Static Networking Configuration....................................................................................................................................2
Dynamic Networking Configuration (DHCP/BOOTP) ..............................................................................................2
NTP Addressing Mode.....................................................................................................................................................2
Display Behavior .....................................................................................................................................................................4
Major Feature Overview ..........................................................................................................................................................5
DHCP/BOOTP Auto-Configuration .................................................................................................................................... 5
Device Name/DHCP Name Registration .........................................................................................................................5
Time Zone Offsets ............................................................................................................................................................... 6
Daylight Saving Time ..........................................................................................................................................................6
NTP Addressing Modes ....................................................................................................................................................... 7
Unicast (Query)................................................................................................................................................................7
Broadcast ......................................................................................................................................................................... 7
Multicast ..........................................................................................................................................................................7
Anycast ............................................................................................................................................................................8
Configuration...............................................................................................................................................................................8
Reset Factory-Default Configuration.......................................................................................................................................8
Default Password .....................................................................................................................................................................8
Configuration Methods ............................................................................................................................................................9
WinDiscovery ......................................................................................................................................................................9
Using WinDiscovery........................................................................................................................................................9
Properties .......................................................................................................................................................................11
Network Settings............................................................................................................................................................11
Device Settings .............................................................................................................................................................. 13
Set Password ..................................................................................................................................................................20
Set Time.........................................................................................................................................................................21
Status .............................................................................................................................................................................22
Telnet Terminal Configuration ..........................................................................................................................................24
Get Status Info ............................................................................................................................................................... 25
Set Device Name ...........................................................................................................................................................25
Set/Reset Password ........................................................................................................................................................ 25
Set IP Configuration ......................................................................................................................................................26
Set NTP Server Parameters............................................................................................................................................26
Set NTP Unicast,Multicast,Broadcast Mode .................................................................................................................26
Set NTP Client Parameters ............................................................................................................................................ 26
Configure Telnet Interface .............................................................................................................................................26
Ping Via Device ............................................................................................................................................................. 27
Set Time.........................................................................................................................................................................27
Set Time Zone Bias........................................................................................................................................................27
Set Daylight Saving Time Parameters ........................................................................................................................... 27
Set Digital Display Intensity.......................................................................................................................................... 27
Set Digital Display Type................................................................................................................................................27
Set Digital Display Options ...........................................................................................................................................27
Set Analog Clock Hourly/Twice Daily Correction ........................................................................................................28
Soft Reset.......................................................................................................................................................................28
Reset Configuration .......................................................................................................................................................28
Set stepper hand position analog clock ..........................................................................................................................28
Get Status stepper analog clock ..................................................................................................................................... 28
Enable/Disable User Control of Digital Display...........................................................................................................28
RS-232 Terminal Configuration ........................................................................................................................................29
Troubleshooting Tips .................................................................................................................................................................30
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Specifications.............................................................................................................................................................................36
Physical..................................................................................................................................................................................36
Power Requirements .............................................................................................................................................................. 36
Communications – Protocol...................................................................................................................................................37
Communications – I/O........................................................................................................................................................... 37
Power Requirements .............................................................................................................................................................. 37
Operating/Storage Temperature & Humidity ........................................................................................................................ 37
Compliance ............................................................................................................................................................................38
Limited Warranty...................................................................................................................................................................39
Limitation of Liability ...........................................................................................................................................................39
Proprietary Notice.................................................................................................................................................................. 39
Appendix A - WinDiscovery Global Password Feature ........................................................................................................... 40
Enabling Global Password ..................................................................................................................................................... 41
Disabling the Global Password.............................................................................................................................................. 41
Changing the Global Password.............................................................................................................................................. 42
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Introduction
Network Time Display (ND) is a series of versatile, multi-featured Network Time Protocol (NTP)
driven digital clock displays. These devices have a built-in SNTP (Simple Network Time Protocol)
client and are designed to display time referenced to either an internal or Internet provided NTP server,
using SNTP. The ND network clocks can be configured to display local time for any time zone
worldwide by enabling time zone offset and automatic DST (Daylight Saving Time) adjustments. This
device allows for maintenance free, reliable, quiet operation.
The ND series II, consists of the following ND-2 and ND-4 (6 digit display) members:
DisplayType
Name
ND-2
2.3” Characters,
Rackmount –
2RU
ND-4
4” Characters,
Wallmount
Power options
(Part numbers)
AC model
(820-1442-AC)
POE model
(820-1442-POE)
AC model
(820-1444-AC)
POE model
(820-1444-POE)
• 12 hour (with PM indicator) time
• 24 hour time hh:mm:ss
• MM:DD:YY date
• DD:MM:YY date
• Worldwide Time Zone
• Worldwide Automatic DST
Please refer to the Specifications section of this document for
additional details regarding each model and available options.
Six Digit Digital Time/Date
The ND clock line includes the WinDiscovery Windows based network management software as
well as a telnet interface for configuration, and maintenance. Other features include:
• Time zone offsets (to one second resolution) support any biasing requirements
• Complete flexibility in daylight savings time configurations
• Real-time clock backup retains time during loss of power and/or NTP
• Primary and secondary NTP source with fault-tolerant switching
• Supports NTP broadcast, multicast, and query (unicast) modes
• Fully configurable network settings, including DHCP/BOOTP support.
• Security features include password protection of configuration, encrypted communication, and
the ability to disable telnet management access.
• Selectable Display formats
• Adjustable brightness
• Status display to remotely ‘view’ clock display through WinDiscovery application.
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Installation
Operating Environment
The ND series is not water or moisture proof and is designed for indoor use only. Treat it as you
would any other delicate electronic device and do not expose it to water, excessive heat, or physical
abuse. See the Specifications section for details on the environmental/operational conditions.
Pre-Installation Checklist
Before installing an ND, one should be prepared with the following basic configuration information that
the device will require. It may be necessary to obtain some or all of this information from a network
administrator in your organization.
Static Networking Configuration
__ IP address and netmask designation for device
__ Primary and secondary DNS (domain name) servers
__ Gateway/router
__ Primary and secondary NTP time sources
Dynamic Networking Configuration (DHCP/BOOTP)
__ Confirm that a DHCP/BOOTP service is accessible on the local network
__ Determine if DHCP server will provide NTP server configuration
__ Determine if DHCP server will provide time zone configuration
NTP Addressing Mode
__ Determine if the clock (client) will query the NTP server (unicast mode), listen for NTP broadcast messages
(broadcast mode) , or listen to NTP as part of a multicast group (multicast mode)
All ND clocks can be provided with a verbose name. The name is arbitrary and may be useful for
organizing and managing devices once installed at a facility. By default, device names are the product
name abbreviation followed by the device’s Ethernet (MAC) address. Customers may wish to designate
names relating to their own organizational requirements. It is recommended that a robust naming
scheme be developed before devices are installed to different locations within an organization.
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AC Versions
:
AC models of the ND clock are supplied with an IEC power cord
o Insert the standard Cat 5 or Cat 6
net
work cable into the RJ45
connector on the rear of the unit.
o Insert the AC power cord into the
onnector on the rear of the unit.
IEC c
POE Versions:
Power Over Ethernet (POE) models will require an IEEE 802.3af compliant POE injector, or switch
with +48VDC output on spare pairs of the network cable conductor 4 & 5 with corresponding 48 VDC
returns on pins 7 & 8, or by sharing the data pins and their returns.
o Insert the standard Cat 5 or Cat 6
network cable into the RJ45
connector on the rear of the unit.
o The other end of this network cable
must be connected to an IEEE
802.3af compliant PSE (Power
Sourcing Equipment) with +48VDC.
o This single network cable will carry
both data and power. Maximum
distance is 100m/328ft
[Important Note: the ND clock with an installed POE (Power Over Ethernet) option, will obtain its
power directly from a POE powered source using the spare wires of a standard network cable with
RJ45 connector for input power. The POE source must be a fully compliant IEEE 802.3af PSE
operating at +48VDC. POE sources not IEEE 802.3af compliant might damage the clock and void
the warranty. ]
After application of power, the network clock will go through an internal self-test. Time from
the real-time clock backup will then be displayed until the clock is configured to find an NTP
reference. The colons will flash until an NTP source is found. The flashing colons are a
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normal visual status indication alerting the user that the clock is not synchronized to the NTP
ser
ver.
[Note: the ND series of clock displays are enabled with DHCP by default. When configured to
obtain network configuration through DHCP, the display may hesitate on startup while DHCP
is resolved.]
At this time the clock can be communicated with over the local network using the
WinDiscovery application. WinDiscovery can find and identify clocks through the exchange
of broadcast messages by using UDP broadcasts, even when TCP/IP networking parameters
are not configured on the same network.
[Note: networks separated by physical routers will often block UDP broadcasts preventing
WinDiscovery from locating devices on a remote network. Under such circumstances,
WinDiscovery must be operated from a computer within the remote network or
routers
separating the networks must be configured to pass through (both directions) UDP broadcasts
on port 6163.]
Once the clock has a valid network configuration and the IP address is known, it can also be
accessed via Telnet by computers in the same logical network.
In situations where providing basic network configuration via WinDiscovery application is not
practical, the clock can also be configured through an RS232 terminal interface. To use this
feature, connect an RS232 terminal (or PC serial port) to the DB-9 connector on the rear of the
clock with a straight-through 9-pin cable. Use the communication settings: 8, N, 1, none.
Once connected, press ENTER once to display the login/menu screen.
Display Behavior
The colons of the clock display will flash once per second when the device is unable to obtain
time from an NTP source. If this condition persists for 24 hours (by default) then dashes will
be displayed. When NTP time is available and valid, the colons will remain steady-on.
Normal (preferred operation) is a display with the colons steady on, indicating that the clock is
synchronized.
[Note: The flashing colons and/or dashes are a normal visual status indication alerting the
user that the clock is not synchronized to the NTP server.]
PM Indicator: If the ND is configured for a 12-hour time display mode, an LED indicator will
appear in the bottom right corner of the display during the PM hours.
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Major Feature Overview
The network clocks can be configured using one of the following:
• WinDiscovery software application provided with your clock
• Telnet (once IP address is known or configured)
• RS-232 terminal-style interface (such as Windows HyperTerminal application)
Consult the section entitled Configuration
for details on how to adjust settings through the
aforementioned mediums.
DHCP/BOOTP Auto-Configuration
DHCP (Dynamic Host Configuration Protocol) is a mechanism for automating the configuration of
networked devices that use TCP/IP. When DHCP is enabled, DHCP configuration acquisition will
overwrite any manual configuration items. A precursor to DHCP is BOOTP. The ND can obtain
configuration from a BOOTP server when no DHCP server is present. Factory default: DHCP enabled.
The following RFC2132-defined optional configuration items are, when available, used by the ND clock
for configuration purposes:
Option No. Comments
Time Offset 2 The value provided will be used for the time zone offset configuration,
unless it is defined as zero in which case it will be ignored and the ND
will rely on internal configuration. Note: this option does not provide
information appropriate for dynamic daylight savings time use.
Router 3 The first IP address provided will be used for router/gateway
configuration.
Domain Name Server 6 Up to two server IP addresses may be specified. ND clock will treat
addresses as primary and secondary DNS servers.
Network Time Protocol Server 42 Up to two server IP addresses may be specified. ND clock will treat
addresses as primary and secondary NTP servers.
[Important Note: A network clock will not function properly if configured to use DHCP services when
no DHCP server is present on the network.]
Device Name/DHCP Name Registration
All ND network appliances can be provided with a device name. By default, device names are the
product name abbreviation followed by the last octet of the device’s Ethernet address (MAC address).
If a DHCP server is available on the network when the ND clock is installed, the unit will be autoregistered with the DHCP server. The network system administrator can then view this DHCP name
registration and the currently assigned IP address, at the DHCP server.
The user or network system administrator may wish to designate device names relating to their own
organizational requirements. It is recommended that a robust naming scheme be developed before
devices are installed to different locations within an organization.
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The device name may be changed from the factory default name by entering a unique name of up to 32
cha
racters. [Hint: You can change the device name to one convenient for your site – preferably one that
helps you to later identify the exact physical location of the device. Up to 32 character device names are
supported]
[Note: The IP address of the unit is required to configure the ND clock with Telnet.]
[Helpful Hint: The DHCP server can be utilized to provide the IP address of the associated device
name that is registered. ]
Zone Offsets
Time
All network clocks maintain time as UTC (UTC is sometimes equated with or referred to as GMT)
internally. A time zone offset (or bias) can be provided to adjust the time for display purposes. A bias
can be set as a positive (+) or negative (-) value with a resolution of one second.
[Note: Factory default: Time Zone Offset configuration for displaying local time is disabled. You
must enable and configure the settings to display local time.]
[Note: It is highly suggested to utilize an NTP time server with UTC reference and configuring the
offsetting for your time zone and DST in your local time display clock.]
Daylight Saving Time
A daylight savings time (summer time) adjustment can be configured separately and in addition to a
time zone offset.
Network time displays provide flexible configuration options supporting most world daylight time
standards.
Daylight time standards vary widely throughout the world. Traditional daylight/summer time is
configured as one (1) hour positive bias. The new US/Canada DST standard, adopted in the spring of
2007 is: one (1) hour positive bias, starting at 2:00am on the second Sunday in March, and ending at
2:00am on the first Sunday in November. In the European Union, daylight change times are defined
relative to the UTC time of day instead of local time of day (as in U.S.). European customers, please
carefully consult the section entitled Device Settings for details on setting daylight time.
To ensure proper hands-free year-around operation, the automatic daylight time adjustments must be
configured using the daylight time option and not with the time zone offset option.
[Note: Factory default: Automatic daylight savings time is disabled. You must enable and configure
the settings to display local time with DST.]
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NTP Addressing Modes
Unicast (Query)
The network clock supports the unicast method of NTP packets transfer. Unicast method involves direct
transfer of requested information from the NTP server to the NTP client based on a query or NTP time
request. The unicast method is supported simultaneously when either the broadcast or multicast modes
are selected.
Broadcast
The network clock supports the broadcasting of NTP packets. This feature is useful in situation where
network administration may wish to avoid the network traffic created by a large number of clients
making periodic NTP requests, or in situations where such periodic requests end up synchronized is such
a manner as to exceed the NTP100’s ability to reply. The broadcast mode is a widespread or openended broadcast, not intended for any specific IP address.
The ND clock listens for NTP [UDP] broadcasts using the broadcast address [255.255.255.255].
[Note: some firewalls and routers will not forward UDP broadcasts by default. Security configurations
may need to be adjusted to allow the UDP broadcast packets to pass on the configured port.]
Multicast
The network clock also supports multicast addressing of NTP packets as a recently added feature. As
opposed to broadcast mode, which is, a widespread or open-ended broadcast of NTP packets whereby
data is sent to every possible receiver (client), multicasting is useful because it conserves bandwidth. It
does this by replicating packets only as needed within the network to send them only to receivers
(clients) that want them, thereby not transmitting unnecessary packets.
The concept of a group, and group membership, is crucial to multicasting. Every multicast requires a
multicast group; the sender (or source) transmits to the group address, and only members of the group
can receive the multicast data. A group is defined by a Class D
address.
The network clock does not restrict the use of the multicast address assignment and supports the full
range of class D multicast addresses or groups from 224.0.0.0 to 239.255.255.255. These groups or
class D address ranges for multicasting are defined and governed by RFC3171, IANA IPv4 Multicast
Guidelines.
Typically, the multicast address range 224.0.1.0 - 224.0.1.255 (224.0.1/24) [ Internetwork Control
Block] is utilized for NTP traffic, however, please refer to the RFC3171 for your specific application
and implementation.
The Internet Group Management Protocol (IGMP) is a protocol that controls group membership for
individual hosts. This protocol only operates in a LAN setting, but is required if you wish to be able to
join a multicast group on a host. IGMP is defined in RFC 2236
.
[Note: Use of the multicast addressing method requires the use of routers & switches and other network
devices which support the Internet Group Management Protocol (IGMP). In addition, the IGMP mode
must be enabled and configured for multicasting addressing to be implemented properly. Please ensure
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that your network system components are capable of, and configured properly for IGMP before utilizing
the
multicast addressing feature. Consult you IT/network administrator for assistance in utilizing the
multicast addressing feature.]
[Note: You will need to check with your firewall vendor to determine how to enable multicast traffic
through a firewall. In addition, you may want to read RFC 2588: IP Multicast and Firewalls. ]
Anycast
The network clock does not currently provide anycast capability.
Configuration
The network clock ships from the factory with most software configuration offset options in the OFF
setting, in order to display UTC time.
This factory default configuration is defined as:
o DHCP/BootP provided network configuration - Enabled
o DHCP provided NTP server address entry - Enabled
o Query (Unicast) NTP client -Enabled
o Time zone offset - Disabled
o Automatic Daylight Saving Time Adjustment - Disabled
o Telnet access – Enabled
o Display dashes when not synchronized to an NTP time server (after 24 hrs – default) - Enabled
Reset Factory-Default Configuration
In some situations (such as a lost password) it may be necessary to return the network clock to its
factory default configuration. A reset configuration button labeled “RESET” is located on the
electronics cover on the rear of the network clock chassis, to perform this function.
To reset configuration to factory default –
1. Depress and hold the reset configuration button on the rear of the clock.
2. Remove power from the device, while continuing to hold the reset button down.
3. Apply power to clock and continue holding the reset button down for five seconds.
4. The network clock device configuration will now be reset, including the password, and the
unit will need to be reconfigured.
Default Password
The factory-default password for the network clock is: “public”
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Con
figuration Methods
Basic operation of the network clock is configured via the WinDiscovery software supplied with the
clock, or via Telnet if the IP address of the clock is known, or via the RS-232 interface. Only one
configuration method should be used at a time.
WinDiscovery
The WinDiscovery (WD) program is a Windows based program supplied with the network clock.
WinDiscovery is currently supported under Windows 2000/XP/2003 Server/Vista operating systems.
To install the WinDiscovery program on your server/workstation/PC, complete the following steps:
1. Insert the software CD that shipped with your network clock.
2. Run the ‘setup.exe’ application from the CD. [Note, if you have your Windows OS configured
to autorun applications from a CD when installed, this process will be automatic.]
3. By default, the setup utility will suggest installing files to C:\Program
Files\Symmetricom\WinDiscovery. (Another path may be selected if desired.)
Using WinDiscovery
Open the WD program by clicking the shortcut on your desktop (or other fashion dictated by your
installation). Only one user should be using WD at a time, and other methods should not be used to
manage the network clocks while using WD.
Click the Discover button on the lower left of the screen.
ND clocks accessible on the network will announce their presence. The real-time status bar will
All
display the count of devices found. When complete, a list of device families and groups will be
displayed in the left pane of the WD window. ND network clocks are digital time display members
of the “Symmetricom, Inc. NTP Clocks” family. Click on the plus [+] sign to the left of any family
or group to open and view device types that were found.
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Clicking on any device group will list in the right pane of the WD window all devices of that type
found. Only the devices shown in the right window can be managed. To configure another device
group, click on the device name in the left window and the device names will then appear in the
right window, ready to be managed.
To configure and manage a device shown in the right window, double click or right click the device
name and a menu appears. The choices are:
Properties
Network Settings
Device Settings
Set Password
Set Time
Status
Reset Device
Clicking a menu choice opens a new window for that function. When working in the management
windows, use the Apply and OK button to accept changes that you have made. Use the Cancel
button to exit the screen without applying changes. NOTE: Cancel does not undo changes that have
been saved using the Apply button.
The following sections provide detailed information regarding the right click menu options.
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Properties
The network configuration may be viewed in a summary form under the Properties selection.
Network Settings
The network settings must be established for the clock to operate on the network. You must be a
network administrator or have their support to complete these functions. Your network administrator
determines the information for the Network Settings.
[Note: The default factory setting for network configuration is to use DHCP/BOOTP.]
[Note: If a DHCP server cannot be found on the network by the ND clock, the IP address will be
assigned a fallback IP address of 169.254.xxx.xxx]
To utilize static IP addressing, de-select the checkbox for “Automatically obtain network configuration
from DHCP/BOOTP”. You must enter the IP address, Netmask, Gateway, Primary DNS, and may
enter a Secondary DNS.
[Note: The static IP address you enter must not be in use by another device on the network, this includes
IP address ranges reserved for use by the DHCP server. If a static IP address is used which creates a
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