Masterclock NTP100 -SERIES User manual

NTP100 -SERIES
NETWORK TIME PROTOCOL SERVER
USER MANUAL
www.masterclock.com Tel: [phone] Fax: [phone]
2484 W Clay St, St. Charles MO 63301 © Masterclock, Inc. Oct-12 Printed in USA

DISCLAIMER
The information contained in this document is subject to change without notice. Masterclock, Inc. (hereinafter MC) 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. MC 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 information at the end of this document.
ADVISORY NOTICE
CONCERNING GPS SATELLITE SYSTEM AND THE NTP100-GPS
Depending on many factors beyond the control of MC, the signals that are received from the GPS satellites are subject to
interference, fading, satellite failure and other influences that could cause the NTP100-GPS to provide erroneous time
and/or date information and, under some conditions, could prevent it from providing time/date information.
It is the responsibility of the user to determine the adequacy and suitability of this device for the intended use.
CONCERNING TIME CODE INPUT AND THE NTP100-TC
Depending on many factors beyond the control of MC, the signals that are received from the Time Code Input Source are
subject to interference, noise, loading effects and other influences such as time code format that could cause the
NTP100-TC to provide erroneous time and/or date information and, under some conditions, could prevent it from providing
time/date information.
It is the responsibility of the user to determine the adequacy and suitability of this device for the intended use.

NTP100 – Rev 2.2.0 Oct-12 © Masterclock®, Inc.
Table Of Contents
Introduction .................................................................................................................................................................................1
Introducing the NTP100 Family..........................................................................................................................................1
UTC/Greenwich Mean Time ...............................................................................................................................................2
NTP (Network Time Protocol) ............................................................................................................................................2
GPS Satellites (model NTP100-GPS only)..........................................................................................................................2
Installation...................................................................................................................................................................................3
Operating Environment............................................................................................................................................................3
GPS Antenna and Cable (model NTP100-GPS, NTP100-GPS-HS only) ...............................................................................3
Antenna Location.................................................................................................................................................................3
Pre-Installation Checklist.........................................................................................................................................................4
Network Security/Topology Considerations........................................................................................................................4
Quick Start Information...........................................................................................................................................................4
Initial I/O Connections and Operation.................................................................................................................................4
Start-Up and GPS Satellite Acquisition (model NTP100-GPS, NTP100-GPS-HS)............................................................7
Start-Up and Time Code Acquisition (model NTP100-TC)................................................................................................7
Input Impedance ..............................................................................................................................................................7
Input Level.......................................................................................................................................................................7
Time Code Input Select ...................................................................................................................................................7
Front-Panel Behavior...............................................................................................................................................................8
Major Feature Overview..........................................................................................................................................................8
DHCP/BOOTP Auto-Configuration....................................................................................................................................8
NTP Addressing Modes.......................................................................................................................................................9
Unicast.................................................................................................................................................................................9
Broadcast .............................................................................................................................................................................9
Multicast..............................................................................................................................................................................9
Anycast................................................................................................................................................................................9
Configuration.............................................................................................................................................................................10
Battery Backed RTC and Configuration................................................................................................................................10
Reset Factory-Default Configuration.....................................................................................................................................10
Default Password...................................................................................................................................................................10
Configuration Methods..........................................................................................................................................................11
WinDiscovery.....................................................................................................................................................................11
Potential Communication Problems...............................................................................................................................11
Using WinDiscovery......................................................................................................................................................11
Properties.......................................................................................................................................................................13
Network Settings............................................................................................................................................................13
Device Settings..............................................................................................................................................................15
Set Password..................................................................................................................................................................21
Set Time/Date................................................................................................................................................................22
Status .............................................................................................................................................................................25
Telnet Terminal Configuration..........................................................................................................................................26
Set Device Name ...........................................................................................................................................................27
Set IP Configuration ......................................................................................................................................................27
Set/Reset Password........................................................................................................................................................28
Set Display Intensity......................................................................................................................................................28
Set NTP Stratum Levels ................................................................................................................................................29
Set NTP Server Port.......................................................................................................................................................29
Set NTP Broadcast/Multicast Options...........................................................................................................................30
Configure Telnet Interface.............................................................................................................................................32
Set Reference Identifier .................................................................................................................................................32
Set to Default Configuration..........................................................................................................................................33
Set RTC Backup/Time Dissemination Options .............................................................................................................33
Set Time/Date Options...................................................................................................................................................33

NTP100 – Rev 2.2.0 Oct-12 © Masterclock®, Inc.
Exiting Telnet ................................................................................................................................................................35
RS-232 Terminal Configuration (specific to models GPS and OSC )...............................................................................35
NTP Client Information.............................................................................................................................................................37
Dimension 4.......................................................................................................................................................................37
TimeSync...........................................................................................................................................................................37
XNTP.................................................................................................................................................................................37
W32Time Service (Windows Time Service).....................................................................................................................37
Disclaimer..........................................................................................................................................................................38
Troubleshooting Tips.................................................................................................................................................................39
GPS Lock Related Issues.......................................................................................................................................................44
Time Code Decoding Issues..................................................................................................................................................45
Specifications.............................................................................................................................................................................47
Communications – Protocol...................................................................................................................................................47
Communications – I/O...........................................................................................................................................................47
Time Code Input – (model –TC) ...........................................................................................................................................47
Power Requirements..............................................................................................................................................................47
Physical..................................................................................................................................................................................48
Pre-Amplified Antenna (required for model NTP100-GPS only) ....................................................................................48
Operating/Storage Temperature & Humidity.....................................................................................................................48
Compliance............................................................................................................................................................................49
LIMITED WARRANTY...............................................................................................................................................................50
Exclusions ...............................................................................................................................................................................50
Warranty Limitations ................................................................................................................................................................50
Exclusive Remedies..................................................................................................................................................................50

NTP100 – Rev 2.2.0 Oct-12 1© Masterclock®, Inc.
Introduction
Introducing the NTP100 Family
The NTP100 is a family of high-precision, small profile, Ethernet network timeservers, utilizing the Network Time
Protocol (NTP). The NTP100 family of NTP time servers, consists of the following NTP100 members:
MODEL Primary Reference Secondary Reference Tertiary Reference
NTP100-GPS-HS
High Stability External GPS satellite signal
•internal GPS receiver
•requires external GPS
antenna
Internal OCXO (Oven
Controlled Crystal
Oscillator), & RTC (real-time
clock) reference.
Internal TCXO
(Temperature
Compensated Crystal
Oscillator), & RTC (real-
time clock) reference.
NTP100-GPS External GPS satellite signal
•internal GPS receiver
•requires external GPS
antenna
Internal TCXO & RTC None
NTP100-TC External Time Code signal
using
•internal time code
decoder
•requires external
SMPTE 30/25/24 fps
or IRIG-B/B(1) time
code source
Internal TCXO & RTC None
NTP100-OSC –HS
High Stability
Internal OCXO (Oven
Controlled Crystal Oscillator),
& RTC (real-time clock)
reference.
Internal TCXO & RTC None
NTP100-OSC Internal TCXO (Temperature
Compensated Crystal
Oscillator), & RTC (real-time
clock) reference.
None None
Each NTP100 device can operate on a local area network (LAN) or act as an enterprise-wide source for traceably
accurate time and date distribution, depending upon your network configuration.
Each NTP100 device includes the WinDiscovery configuration & management software, as well as a Telnet interface for
configuration and maintenance. Other common features include:
•Internal battery backed real time clock (RTC) with temperature compensated crystal oscillator (TCXO), retains
time during loss of power (all models), GPS satellite signal (model –GPS), or time code signal (model –TC).
Typical holdover stability of TCXO is <165mS/day.
•High Stability models have Oven Controlled Crystal Oscillator (OXCO) and RTC which maintain typical holdover
stability of 1ppb/day (<19mS/day or <7 sec/year) while powered and after initial time input or GPS lock, and 30
days aging. High Stability models revert to a precision TCXO and battery backed RTC during loss of power
•Supports NTP broadcast, multicast, and/or unicast (query) mode.
•Fully configurable network settings, including DHCP/BOOTP or Static IP addressing support
•Security features include password protection of configuration, encrypted communication, and the ability to disable
telnet management access
•Adjustable time display brightness
•Status display to remotely monitor status and behavior
•Selectable Stratum Identification levels

NTP100 – Rev 2.2.0 Oct-12 2© Masterclock®, Inc.
UTC/Greenwich Mean Time
UTC is a time standard which is the basis for the worldwide system of civil time. This time scale is kept by time laboratories
around the world, including the U.S. Naval Observatory, and is determined using highly precise atomic clocks. The UTC
scale is coordinated in Paris by the International Bureau of Weights and Measures (BIPM).
UTC runs at the rate of the atomic clocks, but when the difference between this atomic time and one based on the Earth
approaches one second, a one second adjustment (a "leap second") is made in UTC.
UTC is the local time at the prime reference meridian at Greenwich, England. At a given location on the planet, local time
can be displaced (referenced to UTC) by -11 to +12 hours. North and South America are from -3 to -11 hours delayed; most
of Europe and Africa and all of Asia and Australia are advanced by +1 to +12 hours. Because the NTP time distribution
standard operates with UTC-reference time only, time zone and/or daylight savings (summer) time are not used.
UTC is sometimes colloquially referred to as "Greenwich Mean Time" (abbreviated GMT).
NTP (Network Time Protocol)
NTP is an open-standard time synchronization protocol designed for precision synchronization and maintenance of
time/date on computers and other devices attached to TCP/IP networks. NTP itself is transported with the UDP/IP
(User Datagram Protocol), and is usually served on port 123. NTP time/date is UTC-referenced, as the protocol has no
provisions for representing time zones or daylight savings (summer) time.
A wealth of useful NTP information and resources can be found at http://www.ntp.org
GPS Satellites (model NTP100-GPS only)
The GPS satellites are operated and maintained by the U.S. Department of Defense and allow for the precise determination of
local time and location at any point on (or above) the Earth. This is accomplished via the transmission of very accurate
timing information from a series of satellites that provide coverage of the entire planet.
The NTP100-GPS derives the precision UTC time that it serves from the GPS satellite network using an internal GPS
receiver and requires the connection of a pre-amplified GPS antenna.

NTP100 – Rev 2.2.0 Oct-12 3© Masterclock®, Inc.
Installation
Operating Environment
The NTP100 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. Please see the
“Specifications” section.
GPS Antenna and Cable (model NTP100-GPS, NTP100-GPS-HS only)
The NTP100-GPS or NTP100-GPS-HS requires a pre-amplified antenna. It provides +5 VDC via the center pin of the
coaxial cable/connector for remote power to the antenna.
[WARNING: Attaching a passive (non pre-amplified) antenna to the NTP100 could destroy the GPS receiver module.
This is a major repair cost which is not covered by warranty.]
The unit is tested and shipped with the appropriate cable for the antenna that was ordered. Should you require a longer
antenna cable we recommend that you contact MC so that a properly matched cable and antenna can be supplied.
Although changing the GPS antenna or coaxial cable is not technically difficult, you are on your own should you decide to
make such changes. We do not warrant or support operation with any hardware not installed or supplied by us.
The coaxial cable should not be crushed, crimped or bent at a sharp angle nor should it be strained by pulling. Any damage
to the cable could result in the NTP100-GPS not functioning properly. If the cable is to be coiled for storage, the coil
diameter should be at least 6”.
Antenna Location
Depending on the type of building where the NTP100-GPS is located and obstructions that may block reception of signals
from the GPS satellites, the antenna may have to be located where it has an unobstructed view of the sky. In some cases this
can be accomplished by placing the antenna adjacent to a window. However, in most cases it will require mounting the
antenna outside of the building or on a roof. In the worse case, the basic requirement for assured system operation is that the
antenna has a clear and unobstructed view of the sky for initial satellite acquisition and lock. It is possible that the system
will operate indoors and under other obstructions however this can only be determined empirically; it is not guaranteed.
If a longer cable is required, cables of various lengths (up to 500 feet) with pre-amplified antennas are available from
Masterclock, Inc.
[Note: bringing the NTP100-GPS or NTP100-GPS-HS up for the first time with an indoor antenna may prevent or
significantly increase the time to first fix.]

NTP100 – Rev 2.2.0 Oct-12 4© Masterclock®, Inc.
Pre-Installation Checklist
Before installing an NTP100 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.
•IP address
•Gateway (router)
•Net mask
•Domain Name Servers
- Or –
•Confirm availability of DHCP/BOOTP server (for dynamic networking configuration)
All Masterclock, Inc. network appliances can be provided with a verbose name. The name is not used for any internal
purpose by the NTP100 and is arbitrary. It 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 address (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.
Network Security/Topology Considerations
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. Consult your network administrator for additional information.
Personal computer firewall applications, such as ZoneAlarmTM , BlackICETM, or the Windows XP firewall may
also prevent WinDiscovery from operating correctly. Configure the firewall to allow bi-direction UDP traffic on
port 6163.
Quick Start Information
Initial I/O Connections and Operation
Refer to the table below and begin your installation at the step indicated for your NTP100 model number.
MODEL Front Panel View Rear Panel View Begin at
NTP100-GPS
&
NTP100-GPS-HS
STEP 1
NTP100-TC
STEP 3
NTP100-OSC
&
NTP100-OSC-HS
STEP 4

NTP100 – Rev 2.2.0 Oct-12 5© Masterclock®, Inc.
Model NTP100-GPS (& NTP100-GPS-HS)
1. Locate the antenna in a suitable area so that the top of the antenna module has a clear view of the sky. Do not move it
until after the NTP100-GPS has achieved satellite lock (explained below). Route the antenna cable to the location of the
NTP100-GPS
2. Connect the antenna cable coaxial connector to the gold SMA connector on the rear of the unit (labeled Antenna).
Continue at step 4
Model NTP100-TC
3. Connect the time code signal cable to BNC female connector on the rear of the unit (labeled Time Code Input), and then
to a valid UTC referenced time code signal source.
[Note: The NTP100-TC auto-detects and decodes the date encoded incoming time code signal as UTC referenced time and
treats the incoming time code signal as UTC referenced. Non-date encoded SMPTE or IRIG-B/B(1)
Continue at step 4
NTP100-GPS Rear View
NTP100-TC Rear View

NTP100 – Rev 2.2.0 Oct-12 6© Masterclock®, Inc.
All NTP100 Models
4. Connect an RJ-45 10-baseT Ethernet cable to the female RJ-45 connector on the rear of the unit (labeled Ethernet), and
then to a hub or switch on your Ethernet network.
5. Apply power by inserting the power supply module into an appropriate AC power source and the power connector into
the male Switchcraft-style locking power socket on the rear of the unit (labeled DC IN).
6. If desired the unit can be operated from a nominal 12 VDC battery (9-18 VDC range). Observe voltage polarity as
indicated on the rear panel (the center pin is positive +VDC, and is labeled 9 -28VDC).
7. When power is first applied the initial sequence of the front panel LED is:
•amber and green LEDs on briefly, with time display showing 88:88:88
•all LEDs extinguish briefly
•amber (NTP) LED out, green (Status) LED steady on
•green (Status) LED begins twice per second blink, with time display incrementing the seconds’ digit once per
second (indicating locked to internal TCXO oscillator , and acquiring lock to an external source, if applicable).
•Green (Status) LED begins to blink once per second and time display increments the seconds digit once per second
when synchronized to an external reference source, if applicable.
[Note: when configured to obtain network configuration through DHCP, the display may hesitate on startup
while DHCP is resolved.]
At this time the NTP100 can be communicated with over the local network using the WinDiscovery application.
WinDiscovery can find and identify the NTP100 through the exchange of broadcast messages even when TCP/IP
networking parameters are not configured on the same network.
Once the NTP100 has a valid network configuration and the IP address of the unit is known, it can also be
accessed via Telnet by computers in the same logical network.
NTP100- Rear View
,
Common to all models-
NTP100- Front Panel
,
Common to all models

NTP100 – Rev 2.2.0 Oct-12 7© Masterclock®, Inc.
In situations where providing basic network configuration via WinDiscovery application is not practical, the
NTP100-GPS and NTP100-OSC 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 chassis with a straight-
through 9-pin cable. Once connected, press ENTER once to display the login/menu screen. Note this serial port
interface is not available in the model NTP100-TC.
Start-Up and GPS Satellite Acquisition (model NTP100-GPS, NTP100-GPS-HS)
When the NTP100-GPS is initially powered up, after having been shipped to a new location, the time to first fix (time the
unit takes to acquire satellites and extract correct time) could be up to 25 minutes although it is typically 5 - 15 minutes.
Factors such as atmospheric conditions, type of antenna, antenna location, and antenna cable length will affect the time to
first fix.
The NTP100-GPS’s navigation module is connected to a backup battery that maintains startup data when the unit is powered
down. If, when starting up, the location, time and number of satellites that the unit can receive has not changed significantly
since last power down then the unit will start up much faster.
Start-Up and Time Code Acquisition (model NTP100-TC)
When the NTP100-TC is initially powered up, after having been shipped to a new location, the time to first fix (time the unit
takes to detect, acquire, decode, gain adjust time code and extract correct time) could be up to 90 seconds although it is
typically 30 seconds or less. Factors such as the time code input signal level, time code signal type, time code cable length
and type, and system noise, will affect the time to first fix.
Input Impedance
The input impedance for the Masterclock TC time code decoder circuit is considered to be relatively high , typically
>100kOhm. This high input impedance allows for connecting multiple Masterclock TCR load devices in parallel without
loading and/or distorting the time code input signal.
Input Level
The input level is controlled via an automatic gain control circuit. The NTP100-TC firmware will automatically determine
the appropriate gain control setting for your incoming time code dB level.
The NTP100-TC cannot adjust for time code signal levels outside the range of -15 and +20dB.
The NTP100-TC typically requires up to 30 seconds to complete automatic gain control when decoding SMPTE or
IRIG-B/B1. When proper gain control has been achieved the incoming time code type and raw time code should be read and
displayed on the status screen in WinDiscovery, and the front panel status LED on the card will blink once per second.
Time Code Input Select
The NTP100-TC will automatically detect which format of time code is being provided upon initial power up with a valid
time code source, or if the time code input is varied. No user -programmable hardware or software adjustments are
necessary.
The NTP100-TC contains a time code decoder circuit which is designed to auto detect and decode time code information
along with date information from the following date encoded time code formats:
•SMPTE (30/25/25 fps) to Leitch Date Encoding Standard,
•IRIG-B pulse width coded (unmodulated) DC, to IEEE 1344 standard,
•IRIG-B(1) 1 kHz Amplitude Modulated, IEEE 1344 standard
Note: The time code input and date information is required and expected to be UTC. Time zone and/or Daylight Saving
Time Offset are not supported.

NTP100 – Rev 2.2.0 Oct-12 8© Masterclock®, Inc.
In addition, the NTP100-TC has a special provision to support non-date encoded SMPTE or IRIG-B/B(1) time code. The
NTP100-TC contains a feature to set/overwrite the date or year manually by writing this information to the battery backed
real-time clock. When selected, this allows the user to either ignore the date/year information from the time code signal, or to
provide a date/year for SMPTE (date) or IRIG-B/B(1) (year) time code formats without this information in the time code
signal.
Front-Panel Behavior
The 6 digit LED time display shows the current time (referenced to UTC) available to the NTP100.
The green LED displays synchronization status with the internal time reference. When the LED is blinking at a
twice per second rate it indicates that the NTP100 is not synchronized with an external reference such as GPS or
time code. Once synchronized to the external reference, the green LED will blink at a once per second rate.
The amber LED light pulses briefly when an NTP request is serviced. This is provided as a general indication of
when and how frequently NTP requests are being processed.
Major Feature Overview
The features discussed in this section can be configured in several ways - the WinDiscovery software application provided
with your NTP100, or a terminal-style interface accessible via RS-232 and Telnet. 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 NTP100 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 NTP100 for configuration
purposes:
Option No. Comments
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. NTP100 will treat
addresses as primary and secondary DNS servers.
[WARNING: An NTP100 will not function properly if configured to use DHCP services when no DHCP server is present on
the network.]
NTP100- Front Panel
,
Common to all models

NTP100 – Rev 2.2.0 Oct-12 9© Masterclock®, Inc.
NTP Addressing Modes
Unicast
The NTP100 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 NTP100 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 open-ended broadcast, not intended for any specific IP address.
The NTP100 provides NTP [UDP] broadcasts using the broadcast address [255.255.255.255].
Note that 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 NTP100 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 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 NTP100 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 that support
the Internet Group Management Protocol (IGMP). In addition, the IGMP mode must be enabled and configured for
multicasting addressing to be implemented properly. The implementation of multicasting addressing is beyond the scope of
support available from Masterclock. Please ensure that your network system components are capable of , and configured
properly for IGMP before 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 NTP100 does not currently provide anycast capability.

NTP100 – Rev 2.2.0 Oct-12 10 © Masterclock®, Inc.
Configuration
The NTP100 maintains an internal configuration that defines a number of parameters regarding the unit’s operation.
These configuration settings include the assigned [static or DHCP] IP address and network settings, assigned device
name, operational mode, broadcast parameters, brightness level, assigned stratum levels, telnet access, RTC usage
validity during primary reference outages, and password, along with the year, date, & time stored [and incrementing] in
the real time clock. The internal configuration is maintained even when power is off.
This information, except for the time/date stored in the RTC, may be reset to the factory default state.
Battery Backed RTC and Configuration
The NTP100 maintains its internal configuration and settings in battery backed memory located on the RTC chip. The
battery supplies power to the TCXO 32kHz oscillator and RTC when the unit is powered off. This allows the internal
configuration to be maintained and the time and date to increment, when power is off. Under normal operating condition, the
memory devices maintaining the RTC data and configuration settings is powered by the external DC power supply and does
not rely on the battery for data retention.
The battery type is a ‘replaceable’ lithium coin cell battery (models - OSC and –GPS) or a maintenance free rechargeable
Manganese Lithium battery (model NTP100-TC).
Note: If the NTP100 does not retain its configuration, or its Date/Time settings (this may be indicated by the front panel time
display counting up from ‘zero’) the battery will likely need replacement. The battery size differs between models. See the
“Specifications” section for details on the recommended battery replacement.
Reset Factory-Default Configuration
In some situations (such as a lost password or removal of confidential information prior to sending the unit in for
maintenance or repair service) it may be necessary to return the NTP100 to its factory default configuration. A recessed
button labeled “RESET”, located on the back of the NTP100 unit, performs this function. To reset configuration to
factory default
1) Remove power from the NTP100
2) Depress and hold the “RESET” button, continue to depress the “RESET” button
3) Re-apply power to NTP100 and continue holding the “RESET” button down for five seconds.
Default Password
The factory-default password for an NTP100 is: public
NTP100- Rear View
,
Common to all models-

NTP100 – Rev 2.2.0 Oct-12 11 © Masterclock®, Inc.
Configuration Methods
Basic operation of the NTP100 is configured via the WinDiscovery software supplied with the unit, or via Telnet (or the
RS-232 interface for the model(s) NTP100-GPS & NTP100-OSC). Only one configuration method should be used at a
time.
WinDiscovery
WinDiscovery (may be abbreviated as WD) is an application designed to run on Windows VISTA , Windows XP, Windows
Server 2003 Server, Windows Server 2000 and Windows 2000 operating systems. The WinDiscovery application is supplied
with the NTP100 device and is used to configure the NTP100 or to review status information. Once configured, the NTP100
does not require WinDiscovery to be running in order to function. To install the WinDiscovery application on your server,
workstation, or PC, complete the following steps:
1. Insert the WinDiscovery CD that shipped with your NTP100 or download the latest version from the support area
of www.masterclock.com
2. If AutoRun is enabled on your PC the Installshield Wizard installation will begin automatically.
Otherwise, browse to the CD root directory and run the ‘setup.exe’ application.
3. Select the installation options by selecting either the standard or custom installation. By default the standard
installation will install all user manuals and application notes along with the WinDiscovery application. The
custom installation will allow the optional installation of the user manuals and application notes.
4. By default, the setup utility will suggest installing files to C:\Program Files\Masterclock\WinDiscovery. (Another
path may be selected if desired.)
Potential Communication Problems
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 traffic
(including broadcasts) on port 6163.
Personal computer firewall applications, such as ZoneAlarm©, may also prevent WinDiscovery from operating
correctly. Configure the firewall to allow bi-direction UDP traffic on port 6163 or temporarily disable the firewall
while using the WinDiscovery application.
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 NTP100 while using WD.
Click the Discover button on the lower left of the screen.

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All Masterclock, Inc. network appliances accessible on the network will announce their presence. The real-time 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 WD window. The NTP100 is a member of the Masterclock, Inc. NTP Server family. Click on the plus
[+] sign to the left of any family or group to open and view device types that were found.
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 mouse click the device name and a
menu appears. The current choices are:
•Properties
•Network Settings
•Device Settings
•Set Password
•Set Time
•Status
•Reset Device

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NOTE: The Update Firmware option is reserved for future use and appears grayed out.
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.
Properties
The properties of the NTP100 device of interest can be viewed in summary form, using this selection. Under “Properties” the
device name, model, and network configuration settings are available.
Network Settings
The network settings must be established for the NTP100 to be accessible to 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 NTD clock, the IP address will be
assigned a fallback IP address of 169.254.xxx.xxx]

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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 duplicate IP address condition, the network clock will be re-assigned a fallback IP address of
169.254.xxx.xxx ]
169.254.xxx.xxx IP (fallback) address
DHCP is enabled by default. If DHCP is enabled and no DHCP server can be found the NTP100 will default to a
169.254.xxx.xxx address.
In addition, if an IP address conflict is determined when the Ethernet interface is initialized (either DHCP or static) the
NTP100 will default to a 169.254.xxx.xxx address.
This 169.254.xxx.xxx 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.
[Note: 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.]
Device Name
Each clock is programmed at the factory with a factory device name. This name includes the model
name and a “MAC address” extension.
[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. ]
Administrative Hub
[Note: the Administrative Hub configuration item is reserved for future use.]

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Device Settings
Adjust configurable parameters affecting NTP100 operation using the available Basic and Advanced Device Settings.
The Device Settings Configuration interface allows for setting the Broadcast/Multicast Parameters including selecting the
mode the NTP100 will serve NTP, setting the multicast address, setting the broadcast frequency and port, as well as for ,
assigning stratum levels, brightness control, and access to advanced settings.
Broadcast/Multicast Parameters – Allows for setting the NTP mode and parameters of the NTP100 server.
Server port - The default, well known port for NTP service is 123. This can be changed as desired. Note that some
NTP/SNTP clients will expect NTP servers to operate on port 123 and cannot be configured to utilize alternate ports.

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Selecting Unicast Mode for NTP - By default, the NTP100 will operate only in Unicast /Query mode using server port 123
This mode is selected exclusively when neither the provide NTP broadcast nor the provide NTP multicast modes are selected.
Provide NTP broadcasts –. The NTP100 can be set up to provide NTP broadcasts by selecting the “Provide NTP using
broadcast address [255,255,255,255]” checkbox. When enabled, the broadcast on/to port may be specified as well as the
frequency that broadcasts will be issued. This can be changed as desired. The NTP100 provides NTP broadcasts using the
broadcast address [255,255,255,255]
Note: While providing NTP broadcasts, the NTP100 device can also continue to be queried.
Note: Some NTP/SNTP clients will expect NTP servers to operate on port 123 and cannot be configured to utilize alternate
ports.