Synchronized Time Systems
Catalog
Shanghai GlobalTime Electronic Co., Limited
Floor 7, Building 4, No. 651, Wanfang Road, Minhang District, Shanghai, China / 201112
Tel: +86 21 3653 1186
Fax: +86 21 3653 1185
www.ntpclock.com
Synchronized Time Systems
Contents
1. GlobalTime Introduction ...................................................................................................................................1
2. NTP Introduction .................................................................................................................................................1
3. The Power over Ethernet Advantages ...........................................................................................................2
4. NTP Server ............................................................................................................................................................ 2
4.1. Difference of GTT100, GTT200, GTT400 ............................................................................................2
4.2. Features ...................................................................................................................................................... 3
5. Digital NTP Clocks .............................................................................................................................................. 3
5.1. 4” Digital NTP PoE Clock GTD368-Series ...................................................................................... 3
5.2. 2.3” Digital NTP PoE Clock with Date/Text Display-GTD366 ................................................... 5
5.3. 2.3” Rack-mounted NTP Clock- GTD362 ....................................................................................... 6
5.4. Digital NTP Wi-Fi Clocks- GTD369 Series .........................................................................................7
6. Analog NTP Clocks ............................................................................................................................................. 9
6.1. Analog NTP PoE Clocks- GTD360 Series .......................................................................................... 9
6.2. Analog NTP Wi-Fi Clocks- GTD361 Series ..................................................................................... 10
7. GPS Clocks .......................................................................................................................................................... 12
Synchronized Time Systems
1. GlobalTime Introduction
GlobalTime was founded in the year 2003 in Shanghai, China. It is a professional manufacturer of
synchronized clock systems. We strive towards innovation and reliability. We feature a complete line
of NTP servers (GPS servers) and synchronized Clocks. With outstanding R&D team, GlobalTime
offers a wide range of NTP servers and NTP clocks, radio clocks, CDMA clocks. By providing accurate,
real-time information, we keep schools, hospitals, airports, train stations, media houses, offices,
financial institutes, military bases, public security bureaus and other governmental institutes informed
and on the same stage.
Our clocks are widely used in more than 60 countries or regions over the world. Please contact us if
you have any questions about our NTP products.
2. NTP Introduction
Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer
systems over packet-switched, variable-latency data networks. NTP is the most popular time
synchronization protocol in current use.
NTP is intended to synchronize all participating computers to within a
few milliseconds of Coordinated Universal Time(UTC). It uses the intersection algorithm, a modified
version of Marzullo's algorithm, to select accurate time servers and is designed to mitigate the effects
of variable network latency. NTP can usually maintain time to within tens of milliseconds over the
public Internet, and can achieve better than one millisecond accuracy in local area networks under
Shanghai GlobalTime Electronic Co., Ltd 1
Floor 7, Building 4, No. 651, Wanfang Road, Minhang District, Shanghai, China / 201112
Tel: +86 21 3653 1186 Fax: +86 21 3653 1185
Email: contact@ntpclock.com Website: www.ntpclock.com
Synchronized Time Systems
ideal conditions. Asymmetric routes and network congestion can cause errors of 100 ms or more.
3. The Power over Ethernet Advantages
PoE is a network standard based on IEEE 802.3af that delivers DC power and data to Ethernet
connected devices. PoE is fully compatible with powered and non-powered 10/100BaseT Ethernet
devices.
PoE clocks utilize Power over Ethernet (PoE), the same technology that powers IP phones. The PoE
clock receives its power and data from a standard CAT5 patch cable via a PoE injector or switch. By
simply using a Windows-based application, the user can view and/or change existing configuration of
the entire system. The clock will receive its time from a SNTP time server for accurate timekeeping,
thus eliminating the need of a master clock.
4. NTP Server
GTT100 ( 1 LAN Port) GTT200 ( 2 LAN Ports) GTT400 ( 4 LAN Ports)
4.1. Difference of GTT100, GTT200, GTT400
The difference of the three models is at the quantity of LAN Ports, and only with more than 1 LAN Port,
bounding is available. So GTT100 doesn’t support bounding, GTT200 & GTT400 support bounding.
Shanghai GlobalTime Electronic Co., Ltd 2
Floor 7, Building 4, No. 651, Wanfang Road, Minhang District, Shanghai, China / 201112
Tel: +86 21 3653 1186 Fax: +86 21 3653 1185
Email: contact@ntpclock.com Website: www.ntpclock.com
Synchronized Time Systems
4.2. Features
Stratum 1 operation via GPS/ BeiDou/GLONASS satellites
One/ two/ four standard GbE ports, all with patented NTP hardware timestamping
Security-hardened NTP Reflector™ with firewall protection
Web-based management with high-security cipher suite
Exceptional time accuracy to UTC
Extended environmental specifications
IPv4 on all ports
Rubidium atomic clock or OCXO oscillator upgrades
Single power supply or dual power supply option
Can be set as a slave time server to synchronize with host time server
One/two/ four 10M/ 100M/ 1000M adaptive network interface
NTP Reflector option: 20000 NTP client mode three requests per second
TOD/1PPS/10MHz out
MTBF: 90000 Hours
5. Digital NTP Clocks
5.1. 4” Digital NTP PoE Clock GTD368-Series
Features
• Available with 4” digits, 4 digit display or 6 digit display
Shanghai GlobalTime Electronic Co., Ltd 3
Floor 7, Building 4, No. 651, Wanfang Road, Minhang District, Shanghai, China / 201112
Tel: +86 21 3653 1186 Fax: +86 21 3653 1185
Email: contact@ntpclock.com Website: www.ntpclock.com
Synchronized Time Systems
• Red display standard; Optional green, yellow, amber displays
• Time is automatically set by Simple Network Time Protocol(SNTP)- no master clock or serial
connection required
• Uses PoE ( Power over Ethernet) for easy installation and operation
• Static IP or DHCP addressing
• 12 or 24 hour display
• Automatic Daylight Saving Time change (if applicable)
• Adjustable brightness (brilliant, bright, normal, dim, off)
• Capability to receive realtime countdown command
• If connection to NTP server is lost the clocks will continue to run on the built-in time base. When the
connection is restored it will synchronize automatically.
• The clock features time loss notification by having a light on on the right lower corner
• Can be single sided ( has one display) or double sided ( has two displays)
Single-sided Double-sided Double-sided Ceiling Mounting Wall Mounting
Optional
Capable of interface with:
Temperature sensor or humiture sensor
Shanghai GlobalTime Electronic Co., Ltd 4
Floor 7, Building 4, No. 651, Wanfang Road, Minhang District, Shanghai, China / 201112
Tel: +86 21 3653 1186 Fax: +86 21 3653 1185
Email: contact@ntpclock.com Website: www.ntpclock.com
Synchronized Time Systems
Built-in bell relay
5.2. 2.3” Digital NTP PoE Clock with Date/Text Display-GTD366
Black Metal Case Back Side White Metal CaseGrey Stainless Steel Case (SS304
Material)
Features
Available with 2.3” digits, can display calendar or English text ( less than 64 bytes)
Red display standard
Time is automatically set by Simple Network Time Protocol(SNTP)- no master clock or serial
connection required
Uses PoE ( Power over Ethernet) for easy installation and operation
Static IP or DHCP addressing
12 or 24 hour display
Automatic Daylight Saving Time change (if applicable)
Adjustable brightness (brilliant, bright, normal, dim, off)
Capability to receive realtime countdown command
Shanghai GlobalTime Electronic Co., Ltd 5
Floor 7, Building 4, No. 651, Wanfang Road, Minhang District, Shanghai, China / 201112
Tel: +86 21 3653 1186 Fax: +86 21 3653 1185
Email: contact@ntpclock.com Website: www.ntpclock.com
Synchronized Time Systems
If connection to NTP server is lost the clocks will continue to run on the built-in time base. When
the connection is restored it will synchronize automatically.
The clock features time loss notification by having a light on on the right lower corner
Capable of interface with:
Temperature and/ or humidity sensor
Bell Relay
5.3. 2.3” Rack-mounted NTP Clock- GTD362
Specifications
Case: Metal in Black
Size: 44cm*18cm*8.8cm
Weight: 2.78kg
Display: 2.3” digit
LED Color: Red
Mounting Options: 2U Rack-mounted
Viewing Distance: 50 feet - 15 meters
Shanghai GlobalTime Electronic Co., Ltd 6
Floor 7, Building 4, No. 651, Wanfang Road, Minhang District, Shanghai, China / 201112
Tel: +86 21 3653 1186 Fax: +86 21 3653 1185
Email: contact@ntpclock.com Website: www.ntpclock.com
Synchronized Time Systems
Power Supply: 110-240V AC/ 0.7A
Operating Temperature: -10℃ to 70℃
Operational Humidity: 90% maximum, non-condensing
Features
Time is automatically set by Simple Network Time Protocol(SNTP)- no master clock or serial
connection required.
Static IP or DHCP addressing
Display time in 12 or 24 hours format
Supports any time zone.
Supports countdown function
Automatic daylight saving time
Environmentally friendly: the light intensity of the digits is adjustable by the software
Provides NTP server configuration.
If connection to NTP server is lost the clocks will continue to run on the built-in time base. When
the connection is restored it will synchronize automatically.
5.4. Digital NTP Wi-Fi Clocks- GTD369 Series
Features
Available with 4” digits, 4 digit display or 6 digit display
Red display standard; Optional green, yellow, amber displays
Time is automatically set by Simple Network Time Protocol(SNTP)- no master clock or serial
connection required
Shanghai GlobalTime Electronic Co., Ltd 7
Floor 7, Building 4, No. 651, Wanfang Road, Minhang District, Shanghai, China / 201112
Tel: +86 21 3653 1186 Fax: +86 21 3653 1185
Email: contact@ntpclock.com Website: www.ntpclock.com
Synchronized Time Systems
Supports Wi-Fi- no need of network cable distribution.
Static IP or DHCP addressing
12 or 24 hour display
Automatic Daylight Saving Time change (if applicable)
Adjustable brightness (brilliant, bright, normal, dim, off)
Capability to receive realtime countdown command
If connection to NTP server is lost the clocks will continue to run on the built-in time base. When
the connection is restored it will synchronize automatically.
The clock features time loss notification by having a light on on the right lower corner
Can be single sided ( has one display) or double sided ( has two displays)
Single-sided Double-sided Ceiling Mounting Wall Mounting
Capable of interface with:
• Temperature and/ or humidity sensor
• Bell Relay
Shanghai GlobalTime Electronic Co., Ltd 8
Floor 7, Building 4, No. 651, Wanfang Road, Minhang District, Shanghai, China / 201112
Tel: +86 21 3653 1186 Fax: +86 21 3653 1185
Email: contact@ntpclock.com Website: www.ntpclock.com
Synchronized Time Systems
6. Analog NTP Clocks
6.1. Analog NTP PoE Clocks- GTD360 Series
Specifications
Picture
Model GTD360-SA GTD360-BP
Dimensions Diameter: 38cm, Height: 5.1cm Diameter: 34.8cm, Height: 7cm
Weight 1.1kg 0.8kg
Case Aluminum in Silvery Plastic in Black
Accuracy +/- approximately 1 second
Operating Temperature -10℃ to 70℃
Operational Humidity 90% maximum, non-condensing
Mounting Option Surface
Certification CE, FCC, RoHS
Features
Time is automatically set by Simple Network Time Protocol(SNTP)- no master clock or serial
connection required
Uses PoE ( Power over Ethernet) for easy installation and operation
Static IP or DHCP addressing
Shanghai GlobalTime Electronic Co., Ltd 9
Floor 7, Building 4, No. 651, Wanfang Road, Minhang District, Shanghai, China / 201112
Tel: +86 21 3653 1186 Fax: +86 21 3653 1185
Email: contact@ntpclock.com Website: www.ntpclock.com
Synchronized Time Systems
Automatic Daylight Saving Time change (if applicable)- No master clock required
6.2. Analog NTP Wi-Fi Clocks- GTD361 Series
Specifications
Picture
Model GTD361-SA GTD361-BP
Dimensions Diameter: 38cm, Height: 5.1cm Diameter: 34.8cm, Height: 7cm
Weight 1.1kg 0.8kg
Case Aluminum in Silvery Plastic in Black
Mounting Option Surface
Technical Data
Design: Single- sided for surface wall mounting
MTBF: 50000 hours
Accuracy: +/- 1 second
Synchronization: NTP
Wi-Fi frequency: 2.4GHz
Supports: IEEE802.11 b/g/n
Encryption: WEP/ WPA-PSK/ WPA2-PSK
Receiving sensitivity: 802.11b:-86d8m(11Mbps); 802.11g:-71d8m(54Mbps)
Shanghai GlobalTime Electronic Co., Ltd 10
Floor 7, Building 4, No. 651, Wanfang Road, Minhang District, Shanghai, China / 201112
Tel: +86 21 3653 1186 Fax: +86 21 3653 1185
Email: contact@ntpclock.com Website: www.ntpclock.com
Synchronized Time Systems
Certifications: CE, FCC, RoHS, ISO9001
Network
Protocols supported: NTP, HTTP, FTP
NTP protocol modes: C/S mode
IP address assignment: DHCP
Transport protocol: TCP/ IP
Device management: Web- based (requires web browser)
Power supply
Battery: 2 x 1.5V size LR6
Average life of battery: 12 months
Environmental
Operating temperature: -5℃ to 55℃
Operating humidity: 10%-95%, non-condensing
Features
Time is automatically set by Simple Network Time Protocol(SNTP)- no master clock or serial
connection required.
Supports Wi-Fi- no need of network cable distribution.
Shanghai GlobalTime Electronic Co., Ltd 11
Floor 7, Building 4, No. 651, Wanfang Road, Minhang District, Shanghai, China / 201112
Tel: +86 21 3653 1186 Fax: +86 21 3653 1185
Email: contact@ntpclock.com Website: www.ntpclock.com
Synchronized Time Systems
Supports any time zone.
Automatic Daylight Saving Time
Provides NTP server configuration.
If connection to NTP server is lost the clocks will continue to run on the built-in time base. When
the connection is restored it will synchronize automatically.
7. GPS Clocks
Appearance
2.3” digit, with date display 4” Digit 2.3” digit, Rack-mounted
Features
Accuracy: +/- 20 milliseconds
Supports GPS, GLONASS, Galileo, BD. The system automatically selects and synchronizes with the
satellites. If synchronization fails, a dot will light up in the bottom right corner of the clock within
2 minutes.
Can set time zone and daylight saving time.
Adjustable screen brightness.
Shanghai GlobalTime Electronic Co., Ltd 12
Floor 7, Building 4, No. 651, Wanfang Road, Minhang District, Shanghai, China / 201112
Tel: +86 21 3653 1186 Fax: +86 21 3653 1185
Email: contact@ntpclock.com Website: www.ntpclock.com
Synchronized Time Systems
Supports 24-hour or 12-hour display format. When in 12-hour format, a dot will appear in the
top left corner of the display to indicate PM.
Product certified with CCC/FCC/CE/ISO9001.
Additional optional features:
Temperature/humidity sensor can be added to alternate between displaying time and temperature or
humidity.
We reserve the right to make changes at any time.
Shanghai GlobalTime Electronic Co., Ltd 13
Floor 7, Building 4, No. 651, Wanfang Road, Minhang District, Shanghai, China / 201112
Tel: +86 21 3653 1186 Fax: +86 21 3653 1185
Email: contact@ntpclock.com Website: www.ntpclock.com
