Masterclock MDN User manual

Masterclock MDN User Manual –2013.05.07
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Masterclock MDN User Manual –2013.05.07
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Table of Contents
Introduction ............................................................................. 3
Features ................................................................................... 4
Power, Accessories and Software ........................................... 5
Mounting ................................................................................. 6
Configuration Checklist ............................................................ 7
Configuration ......................................................................... 10
WinDiscovery - Installation and Configuration ..................... 12
Telnet ..................................................................................... 20
Specifications ...........................................................................21
Trouble Shooting ....................................................................22
Care and Cleaning .................................................................. 27
Limited Warranty ................................................................... 29
Service and Return Information..............................................30
Health and Safety ....................................................................31
Compliance ..............................................................................32
Mounting Diagram...................................................................35
Contact Information ................................................................36
Thank you for your purchase
of a MDN multifunctional display
device from Masterclock.
Here you’ll find instructions for unpacking
and installing your clock(s), including
suggestions for proper care and
configuration.
We are here to help.
You can reach us using various contact
methods (phone, email, etc.) found at our
website: www.masterclock.com
Before calling, please attempt to find the
answer to your situation here. You’ll find this
user manual will handle virtually all of your
questions.
Disclaimer
The material in this document is for
information only and subject to change
without notice. While reasonable efforts
have been made in the preparation of this
document to assure its accuracy,
Masterclock, Inc. assumes no liability
resulting from errors or omissions in this
document, or from the use of the
information contained herein. Masterclock,
Inc. reserves the right to make changes or
revisions in the product design or the
product manual without reservation and
without obligation to notify any person of
such revisions and changes
Operating Parameters
The MDN contains microprocessor control electronics
designed to operate indoors between 32˚ to 140°F (0˚ to
60˚C) with 0-90% relative humidity, non-condensing.
The MDN is not water- or moisture-proof. Treat it as you
would any other delicate electronic device and do not expose
it to water, excessive heat or physical abuse

Masterclock MDN User Manual –2013.05.07
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Introduction
THE MASTERCLOCK MDN MULTIFUNCTIONAL
DIGITAL DISPLAY syncs to an internal or external NTP
(Network Time Protocol) source for accurate, traceable
time. The MDN is also designed to accept several varieties
of Time Code and to provide countdown abilities for up to
100 days. This is our most versatile time-keeping device yet
The MDN features a three-digit Days to Liftoff display (here,
“H” stands for “Hold”).
The first character is alphanumeric. Nine digits follow.
Used strictly as a clock, the MDN accepts both Network
(NTP) and Time Code (IRIG-B12) signals.
For countdowns, the MDN accepts CS3, a NASA count
protocol based on IRIG. This mode includes three “Hold”
signal display choices.
Also for countdowns the MDN accepts CS5, a NASA count
protocol based on a ASCII stream. Within this mode one
chooses either “Count” or “Launch Time” mode.
In “Auto-detect” mode, the clock displays look for CS3 or
CS5. If they find neither, they will display Network or Time
Code signals.
The display can be “blanked” awaiting the next phase or
project.
The MDN features one alpha and
nine numeric 2.3” (5.8cm) LED digits
in a sturdy attractive black powder-
coated steel case. Not designed for
outdoor use, this display can be
remotely configured and operated.

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Features
Your new MDN multifunctional digital display provides easy-to-read
accurate time based on NTP and Time Code references. Based on a
design for NASA, the MDN features countdown abilities, including
the imposition of a hold. In addition the MDN features:
CS3 and CS5 protocol
Real-time clock back-up, it maintains accurate time during loss
of power and/or NTP reference.
Time Zone offsets (to one second resolution), it supports any
biasing requirements.
Operates on WAN or LAN at 10/100 Mbps
Fully configurable network settings, including DHCP/BOOTP
support.
Primary and secondary NTP reference with fault-tolerant
switching.
Supports NTP Broadcast, Multicast, and Query (Unicast) modes.
Supports Time Code inputs: SMPTE 24, 25, 30 fps and IRIG-B1
AM, IRIG-BO PWM
Security features include password authenticated
communication and the ability to disable Telnet management
access.
Status display to remotely view, adjust and configure devices
with WinDiscovery program
Internal rechargeable maintenance-free battery retains
configuration settings and time for at least two weeks after
power loss.
Nine-digits: Six-digit time display plus three-digit DOY (Day of
Year) or countdown with hold
Syncs to external or internal NTP source for accurate traceable
time
Display time in 12- or 24- hr formats –hh:mm:ss
Three-digit display of “Days to Liftoff” in CS-5 mode or “Day of
Year” in SMPTE, IRIG-B1, IRIG-BO or NTP modes.
Configurable for countdown
Adjustable brightness
Automatic Daylight Saving Time
Standard chassis color is black powder coat
PoE (Power-over-Ethernet) or worldwide AC Power
CE marked for sale in EU –FCC, Class B, emissions (pending)
New! Dry contact relay option - Upon loss of lock from NTP
source NO/NC dry contact relay inside the clock is energized

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Clock Connectors, Power, Accessories and Software
The following items are Included for mounting, power,
configuration and connectivity with your MDN digital
display kit
Mounting brackets (two)
CD-ROM (with WinDiscovery software application
and User Manual pdf)
Power cord –Standard IEC plug
On the back of the unit the various power plugs and
signal input connectors are placed.
RESET BUTTON
In some situations (such as a lost
password) it may be necessary
to return your device to its
factory default configuration.
Press and hold the reset button
to manually reset the MDN
(details on page 19).
STANDARD IEC AC PLUG
A standard IEC power cord and input
are provided.
USB B CABLE INPUT
A USB connection is reserved for
future use.
RJ45 JACK
Input connector admits Ethernet
network data and CS3/CS5 count
data. Requires adapter for CS-3/CS-5
over Ethernet cable.
BNC CONNECTOR
IRIG-BO and SMPTE Time Code data.
CD-ROM IEC power cord
Reset button
IEC power socket for AC
Reset button
IEC power socket for AC
Above: USB B cable input
Middle: RJ45 jack for Ethernet PoE
Below: BNC connector for Time Code signal input
RJ45 Jack Adapter

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Mounting
You can mount your MDN according to your needs. Appropriate
brackets should already be included in your kit.
DESIGNED FOR WALL, RACK OR TABLE MOUNT
Your MDN is designed to fit a variety of surfaces and
environments supported by these sturdy brackets.
WALL MOUNT BRACKET
A wall mounting bracket is supplied which has been designed to
fit on either a standard 2”x 4” or 4” x 4” conduit box. Mount the
bracket on the wall/conduit box, attach the power cord and
CAT5 Ethernet patch cable and secure the MDN to the bracket
using the supplied retaining screws. See page 35 for a plan view
with precise measurements.
SWIVEL MOUNT BRACKET (OPTION)
First, mount both swivel brackets to the wall, then attach the
signal input cable(s) and power cord and finally secure the MDN
to the swivel brackets using the supplied retaining screws. Angle
up or down to provide the best viewing. Finally, tighten all
screws.
TAKE CARE DURING INSTALLATION
Power and low voltage signal wiring should be installed
according to local electrical codes and to enable access to the
back of this device.
Do not route power or signal cables between the case and the
wall (along the exterior of the wall), which may pinch the power
or signal cable and create a hazardous condition.

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Configuration Checklist
Your MDN multifunctional display device gets Network time
cues from the Ethernet and also from IRIG Time Code
sources. Therefore, before installing this device, one should
be prepared with the following basic configuration
information that the device will require during installation
and installation of the WinDiscovery configuration app
(page 12). 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 your MDN
__ Primary and secondary DNS (Domain Name Server)
__ Gateway/router
__ Primary and secondary NTP time references
DYNAMIC NETWORKING CONFIGURATION
__ 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 this device (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.
NAMING
All NTP devices, including your MDN, can and should be
provided with a verbose name (see page 11). The name is
arbitrary and may be useful for organizing and managing
devices once installed. By default, device names are the
product name abbreviation followed by the device’s MAC
address. Customers should designate their own custom
names relating to their own organizational requirements,
32 characters max.
Default
Recommendation
(Examples)
MDN29-21:4B
Bldg101-Rm121
MDN49-45:8A
Conference_Room-342

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INITIAL OPERATION / SERVER ACQUISITION
After receiving power, the MDN will go through an internal
check. Time from the RTC backup will be applied until the
IRIG-B12 signal or NTP time stamp is acquired.
STATUS LED (LIGHT EMITTING DIODE)
The LED colons between the digits on the display will follow
the protocol after power is applied (operation is
configurable via WinDiscovery or Telnet):
TIME ZONE OFFSETS
The MDN maintains time as UTC initially. A Time Zone offset
or bias can be provided to adjust the time for display
purposes (see page 18). A bias can be set as a positive (+) or
negative (-) value. Expect a resolution of one second.
DAYLIGHT SAVING TIME
An automatic Daylight Saving Time (DST) adjustment can be
configured separately (see page 16) in addition to the Time
Zone offset mentioned above. DST begins on the second
Sunday of March at 2:00 AM (Local Time) and ends the first
Sunday of November at 2:00 AM (Local Time).
EU STANDARD –EUROPEAN UNION
In the European Union, daylight change times are defined
relative to the UTC time of day. Summertime Period begins
at 1:00 AM, UTC on the last Sunday of March and ends at
1:00 AM, UTC on the last Sunday of October.
FREEWHEELING ACCURACY
The MDN has built-in provisions to allow it to freewheel and
maintain accuracy for extended periods in the absence of
Time Code. These features also allow the unit to be set
manually and run without Time Code with precision.
LED STATE
STATUS INDICATION
Flashing Colons
No Reference: The device is not able to reference NTP
Solid Colons
Referenced Time: The device is receiving time
referenced from a NTP server
Solid Colons
CS3 and CS5 are locked during a countdown
If the Time Code input is different from
UTC, do not adjust the Time Zone and/or
DST offset. These will adjust automatically.
Daylight Savings Time (DST) adjustments
must be configured using the daylight time
option and not with the Time Zone offset
option in order to ensure proper year-
around operation.

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TCXO AND RTC CIRCUIT
The MDN contains a RTC (Real Time Clock) circuit allowing
the clock to maintain an accuracy of ± minute per year to
the last known Time Code or NTP input (± 165 mSec per
day) when Time Code is not present or cannot be decoded
(i.e. freewheeling mode).
MAINTENANCE-FREE RECHARGEABLE BATTERY
The RTC is maintained continuously from a rechargeable
battery circuit during periods of power outage. Minimum
holdover period is two weeks with a fully-charged battery
under constant drain.
DEFAULT CONFIGURATION
The factory defaults may be restored by using the
WinDiscovery program, Telnet or by using the reset button
at the rear of the MDN.
Your MDN display ships from the factory with the following
configuration as defined below. The MDN firmware
interprets incoming time signals as UTC.
SETTING
CONFIGURATION SELECTION
Disabled
Time Zone Offset
Disabled
Daylight Savings Time
Enabled
NTP Client with DHCP
Enabled
24 Hour format

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Configuration
The Masterclock MDN display maintains its configuration
data in non-volatile flash memory, even when the power is
off. These data are configured on screen using either
WinDiscovery (page 12) software or Telnet (page 20).
The factory default configuration:
SETTING
CONFIGURATION SELECTION
Enabled
DHCP/BootP provided network configuration
Enabled
DHCP provided NTP server address entry
Enabled
Query (Unicast) NTP client
Disabled
Time Zone offset
Disabled
Automatic Daylight Savings Time adjustment
Enabled
Telnet access
DHCP/BOOTP AUTO-CONFIGURATION
DHCP (Dynamic Host Configuration Protocol) is a
mechanism for automating the configuration of network
devices that uses TCP/IP. When DHCP is enabled, DHCP
configuration acquisition will overwrite any manual
configuration items.
Factory default: DHCP enabled.
BOOTP was a precursor to DHCP. The MDN can obtain
configuration from a BOOTP server when no DHCP server is
present.
The following RFC2132 DHCP options defined configuration
items are, when available, used by the MDN for
configuration purposes:
OPTION
#
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 network
device 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. MDN will treat addresses as
primary and secondary DNS servers.
Network Time Protocol
Server
42
Up to two server IP addresses may be specified. MDN will treat addresses as
primary and secondary NTP servers.

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DEVICE NAME/DHCP NAME REGISTRATION
As mentioned earlier, your MDN should be provided with a
custom name (e.g. “reception-north-wall”). By default,
device names are the product name abbreviation followed
by the last octet of the device’s MAC (Media Access Control)
address (e.g. MDN-04:F7).
If a DHCP server is networked when the MDN is installed,
the unit will be auto-registered 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.
DEFAULT PASSWORD
The factory-default password for the network device is:
public.Please use lower case.
RESET FACTORY DEFAULT CONFIGURATION
In some situations (such as a lost password) it may be
necessary to return your device to its factory default
configuration. A [RESET] button is located on the clock’s
rear cover.
To reset the configuration to factory default: Press and
hold the reset button for 10 seconds (until dashes appear
on the digits) and then release. The configuration will now
be reset, including the password. The unit will need to be
reconfigured to your custom settings.
The factory default displaying local time
is disabled. You must enable and
configure that setting to display local
time.
We suggest you use an NTP time server
with a UTC reference to configure the
offset for your Time Zone and DST.
To ensure proper year-around operation,
the automatic DST adjustments must be
configured using the “Daylight Savings
Time” option and not with the “Time
Zone” option.
European customers, please refer to the
“WinDiscovery, DST Settings” section
(page 18) for additional details on setting
“Summer” time (page 8).
A network device will not function
properly if configured to use DHCP
services when no DHCP server is available
on the network.

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WinDiscovery
The WinDiscovery software application is a device setup
and configuration program that operates in the Microsoft
Windows operating system and is supplied FREE with your
MDN device.
INSTALLING WINDISCOVERY
To install the WinDiscovery app complete the following
steps:
Insert the CD that shipped with your network device.
1. Run the “setup.exe” application from the CD.
2. By default, the setup utility will suggest installing files to
C:\Program Files\Masterclock\WinDiscovery. Click OKAY.
USING WINDISCOVERY
Open WinDiscovery from the “Start Menu” or by double-
clicking the shortcut icon on the desktop.
Once you click [Discover], all devices accessible on the
network will announce their presence and the status bar
will display the count of devices found. When complete, a
list of device families and groups will be displayed in the
left pane of the WinDiscovery window.
Each device is configured with a device name from the
factory. This name includes the model name and a MAC
address extension. You should change the device name to
one that identifies the location of the device.
It is highly recommended that only one user opens
WinDiscovery at a time. Other methods should not be used
to manage the network devices while using this software
application.
Click on the plus [+] sign to the left of any family or group to
open and view device types that were found.
Click on the minus [-] sign to collapse the group.
Click on any device group and it will list the devices in the
right pane with all devices of that type found. 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 MDN, right click the device
name and a drop-down menu appears.
To open a MDN “Device Settings”window directly, single
click the device name.

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WITHIN THE DROP DOWN MENU WINDOW:
Six choices are presented. 1. Properties; 2. Network
Configuration; 3. Device Settings; 4. Set Password; 5. Set
Time/Date; 6. Status; 7. Reset Device; and 8. Forget
memorized password.
PROPERTIES
The [Properties] button produces a window that lists the
configuration figures currently used (at left)
NETWORK CONFIGURATION
If you do not want to automatically obtain network
configuration from DHCP/BOOTP, you may make your
changes here (at lower left).
DEVICE SETTINGS
This window is detailed on page 14.
SET PASSWORD
The “Set Password” window enables the entry of a new
password for each individual device.
A password is one to eleven characters and is case-sensitive.
For added password strength, you should use a combination
of alphanumeric and special ASCII characters (i.e. ASCII
character codes 128 –255).
The password must be entered twice to confirm the entry.
Click [Change Password] to save or [Cancel] to discard the
change.
When a password is set for a device, each time you click
[Save] or [Save and Close] for that device you will be asked
for the password. You can select the “Remember this
password for the session” box and you will not be
prompted for the password, until you restart WinDiscovery.
Or you can use the Global Password feature (page 14).
If you enter the wrong password and selected the
[Remember this password for the session] checkbox, you
will receive an error upon clicking [Save] or [Save and Close]
to any configuration changes. You can close the
WinDiscovery session to forget the wrong password(s),
however, this will require entering the passwords again for
each device.

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Alternately, you can remove the incorrect password entry
during a WinDiscovery session by going to the drop-down
menu for the device and selecting [Forget memorized
password].
SET TIME/DATE
This feature may be most useful for demonstration, in lab
situations, environments where an external reference time
signal is not available, when the built-in NTP client is
disabled or when a network connection to an NTP server is
not available.
STATUS
This window is detailed on page 15.
DEVICE SETTINGS
Your MDN display device settings window handles most of
the visible aspects of the device. In short order, the Input
control sets the parameters for the time reference
employed. The “Local Time Settings” configured the display
in the format you prefer, using the [Daylight Savings Time]
and the [Time Zone Offsets] buttons to completely
customize the time output relative to UTC time.
The [Status] button takes you to the
“Status” window (page 16), which
includes a Display Snapshot of the digital
time display, constantly updated. This
update is not ultra-precise, but is meant
to give you a remote view of the display
from your computer console for trouble-
shooting and maintenance purposes.
Here you can choose settings such as the
LED brightness level, format of time, etc.
TIME REFERENCE
INPUT CONTROL
Click the [Input Control] button to reveal the “Input Control”
window. Click the [NTP Client] button to reveal the “NTP Client”
window (page 15).

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QUERY NTP SERVER FOR TIME
The NTP settings are located in the upper left-hand
section of NTP Clock Configuration window (see
oval at left). Note the two settings: Primary and
Secondary.
Primary: The Primary reference information must
be configured in order to acquire time from an NTP
reference.
Enter either the IP address or Internet address/URL
(Uniform Reference Locator) for the NTP reference.
Secondary: If available, enter a secondary
reference for backup.
The primary and secondary server information can
be automatically configured by the DHCP server IF
your DHCP server is configured to do so.
If so, select “Use NTP server(s) address provided
by DHCP server.” (Consult your network
administrator to use this option).
By default, the NTP clock will operate only in
Unicast/Query mode using Server Port 123.
This mode is selected exclusively when neither the
listen for NTP broadcast nor the listen for NTP
multicast modes are selected.
LISTEN FOR NTP VIA MULTICAST
The network clock can be set up to listen to NTP using
multicast addressing by selecting the “Listen for NTP via
multicast address(s)” checkbox.
When enabled, the “Multicast class D / Group address”
may be specified as well as the frequency that multicast
broadcasts will be issued. This can be changed as desired.
The network clock can listen for NTP multicast broadcasts
using the full class D/ group address range. 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 to
224.0.1.255” (Internetwork Control Block) is used for NTP
traffic. However, please refer to the RFC3171 for your
specific application and implementation.
Listen/Query Restrictions
While listening to NTP broadcasts/
multicasts, the network clock cannot be
configured to query the time server.
Some NTP/SNTP clients will expect NTP
servers to operate on port 123 and
cannot be configured to use alternate
ports.
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
duplicate IP address condition, the
network clock will be assigned a fallback
IP address of “169.254.xxx.xxx”.
The “169.254.xxx.xxx” address is a link
local address range (i.e. not allowed on
the internet) and is used by Microsoft
when their DHCP clients cannot find a
DHCP server.

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LISTEN FOR NTP VIA BROADCAST
The network clock can be configured to listen to NTP
broadcasts by selecting the “Listen for NTP via broadcast
address “255.255.255.255” checkbox.
The broadcast timeout is adjustable when this mode is
selected.
The default configuration is to query the NTP server at 10-
minute intervals. The clock drift is +/- 1 minute per year, so
you can adjust as needed. To configure the network clock
device to only listen to NTP broadcasts, click the checkbox
for “Listen for NTP broadcasts only” and enter a “Broadcast
Timeout” in minutes. The default timeout is 60 minutes.
DHCP
The default factory setting for network
configuration is to use DHCP/BOOTP.
The Fallback Address
If a DHCP server cannot be found on the network
by the NTP clock, the IP address will be assigned a
fallback IP address of “169.254.xxx.xxx”
STATUS
The “Status”window is a more compact version of
the “Device Settings”window. Open this by
clicking on the [Status] button. The time
adjustments are listed here. They represent
changes to the internal time reference as
compared to the NTP server. For instance:
1. During acquisition of NTP server
Initial startup
After loss of power
After loss of NTP
2. During changes to the clocks configurations
under:
Network configuration
Device settings (i.e. NTP clock configuration)
Reset device

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STATIC IP
To use a static IP address, de-select the checkbox for
[Automatically obtain network configuration from
DHCP/BOOTP]. You must enter the IP address, netmask,
gateway, primary DNS and also a secondary DNS.
Devices which have been assigned a fallback IP address of
“169.254.xxx.xxx” will be displayed in the main
WinDiscovery window with RED text, indicating a problem
with the configuration.
NTP CLIENT AUTHENTICATION SETTINGS
The MDN uses the MD5 Message Digest Algorithm, which is
a widely used cryptographic hash function that produces a
128-bit hash value.
IPV6 ADDRESSING (PENDING)
IPV4 ADDRESSING
The MDN uses IPV4 communications protocol using 128-bit
addresses to communicate with other Internet devices.
NTP CLIENT ADVANCED SETTINGS
From the NTP Client window, the [NTP Client Advanced
Settings] button allows for the adjustment of additional
network communication settings. Under most operating
circumstances it is not necessary to change these settings.
The factory-default TCP/UDP port for NTP service is: “123”
DISPLAY PROPERTIES
Control the brightness of the display
digits with a slider.
Choose from several other Display
Options including:
1. Type of input (Count, IRIG-B12, Auto
detect or Blank)
2. Clock mode (12- or 24-hour)
3. Count Input (takes one out of clock
mode and into count mode)
4. Whether leading zeroes are on or off
(during 24-hour time)
5. “Hold” symbol preference
6. UTC or local time display
7. Auto-detect CS3 or CS5 default.
8. IRIG-B12/NTP reference failure
display settings
Port 123
Some NTP/SNTP servers will expect NTP clients to
operate on port 123.
If the advanced settings have been altered for
your clock and you begin experiencing difficulty
in getting your clock to synchronize to the NTP
time server, or the clock begins acting erratically,
try returning the advanced settings to the default
values: “123.”

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DAYLIGHT SAVINGS TIME SETTINGS
Click [Daylight Saving Time] to open that window. The clock
has complete flexibility to display any Time Zone and DST
combination.
For setting the DST rules, use one of the following options.
1. Manually enter the daylight saving time rules; or
2. Click [US/Canada Standard]; or
3. Click [EU Standard] (European Union) button.
4. Then Click [Current Windows Setting] to apply the
currently configured for your Windows OS.
5. Click [OK] to close the Window.
The DST rules will be saved when you click [Apply] or
[Apply and Close].
TIME ZONE SETTINGS
Click [Time Zone] to open the “Time Zone Configuration”
window. This window displays a list of Time Zones, including
descriptions to help with the selection. Select your offset
and click [OK] to close this window.
COMMUNICATIONS CONTROL
TELNET CONTROL
The [Telnet Control] button adjusts Telnet configuration. If
Telnet is allowed, the port must be the default Telnet port
of 23. See your network administrator if you need additional
information.
ADMINISTRATIVE FUNCTIONS
From the “Device Settings” window, click the
[Administrative Functions] button to view the following
choices.
SET TIME/DATE
This feature may be most useful for demonstration, in lab
situations, environments where an external reference time
signal is not available, when the built-in NTP client is
disabled or when a network connection to an NTP server is
not available.

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SET PASSWORD
This feature is duplicated from earlier (page xx).
RESET DEVICE
The MDN may be need a “soft reset”to allow the device to
clear its current communications buffer and re-initialize its
processing, which includes re-requesting of a DHCP address.
This feature is intended to allow the user to remotely reset
the unit and does not restore the factory default state.
SET TO DEFAULT CONFIGURATION
Choose this button to reset the MDN back to its factory
defaults (listed on page 10).
“SOFT” RESTARTS
A soft restart may periodically be performed by the MDN to
automatically attempt to rectify a problem it may be
experiencing. The MDN will perform a soft restart under
the following conditions:
1. If the MDN is not receiving an NTP poll response or an
NTP broadcast response depending on which mode the
NTDS is in.
2. If the MDN is set to use DHCP and no DHCP server can
be found.
The timeout before doing a soft restart is not less than ten
minutes. Several factors can increase this time.
1. The soft restart will be delayed by two hours if a
connection is made by Telnet or WinDiscovery.
2. The soft restart could be delayed if the user changes
the default parameters for NTP poll retries/timeouts or
the NTP broadcast times out. For example, if the NTP
broadcast timeout is increased to 60 minutes the soft
restart timeout will also be increased to 60 minutes.

Masterclock MDN User Manual –2013.05.07
20
Telnet
AN ALTERNATIVE WAY TO INTERFACE
A terminal-style configuration is available via Telnet. Use any
standard Telnet client application and specify the IP address of
the device as the server with which to connect. The factory
default port is well-known Telnet server port 23.
The following sections provide basic descriptions of using the
Telnet interface of the network device. Please refer to the
previous Using WinDiscovery sections (p. 14) for additional
details and important operational information regarding the
special features and modes of the network device.
TO INITIATE A TELNET SESSION
Select the [Run] command-line interface from the Start menu
and enter the command “telnet” followed by a space, and then
the IP address of the unit and click [OK].
At the password prompt, type the password and press the
[Enter] or[Return] key.
The factory default for password is:“public.”
To initiate commands, type the command name desired and
press the [Enter] or [Return] key to see a listing of available
commands, type “help” at the prompt.
Configuration via Telnet may not be
convenient for devices operating
with a factory default configuration
since the IP address is not known.
Use the WinDiscovery application to
establish first-time networking
configuration.
For security purposes, the Telnet
interface can be disabled. When
disabled, you will no longer be able
to access the device with Telnet.
To re-enable the Telnet feature, one
of the other configuration methods
must be used, or the device must be
reset to factory default.
If you are not familiar with Telnet,
ask your network administrator for
assistance.
Current configuration or default
answers are displayed in brackets.
Depressing the [Enter] or [Return]
key with no number or letter will
retain the current setting.