Цифровые настенные часы PoE NTP 4 дюйма x цифры Автоматическая смена дневного
- Категория: Wall Clocks >>>
- Поставщик: Shanghai,GlobalTime,Electronic,Co.,Ltd
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Описание и отзывы
Трекер стоимости
| Месяц | Минимальная цена | Макс. стоимость |
|---|---|---|
| Sep-20-2025 | 0.53 $* | 0.14 $* |
| Aug-20-2025 | 0.94 $* | 0.64 $* |
| Jul-20-2025 | 0.94 $* | 0.54 $* |
| Jun-20-2025 | 0.80 $* | 0.92 $* |
| May-20-2025 | 0.42 $* | 0.49 $* |
| Apr-20-2025 | 0.29 $* | 0.41 $* |
| Mar-20-2025 | 0.88 $* | 0.12 $* |
| Feb-20-2025 | 0.59 $* | 0.87 $* |
| Jan-20-2025 | 0.9 $* | 0.10 $* |
Характеристики
What is NTP?
NTP is intended to synchronize all participating computers to within a few milliseconds of Coordinated Universal Time(UTC).[1]:3 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 ideal conditions. Asymmetric routes and network congestion can cause errors of 100 ms or more.
Powered by network. Time is real.
Digital PoE clocks draw both power and time updates from your organization’s Ethernet connection. PoE clocks are energy-efficient and eliminate the need for AC receptacles and the use of batteries. You’ll love the hassle-free installation and maintenance of these synchronized clocks!
Synchronized Clock Systems for:
Offices and home
Healthcare
Education (military schools)
Manufacturing
Education (military schools)
Manufacturing
Insurance companies
Financial institutes
Transportation
Government
Government
Any entity that needs accurate, synchronized clocks but doesn’t want to purchase a master clock or other infrastructure
Data sheet and manual are available online at
http://www.ntpclock.com/manuals
LED Color: Red
Model: GTD368-4SR
Power Supply: PoE or 12V DC, 2A
LED Color: Green
Model: GTD368-4SG
Power Supply: PoE or 18V DC, 2A
Power Supply: PoE or 18V DC, 2A
LED Color: Yellow
Model: GTD368-4SY
Power Supply: PoE or 12V DC, 2A
Power Supply: PoE or 12V DC, 2A
LED Color: Amber
Model: GTD368-4SA
Power Supply: PoE or 12V DC, 2A
Power Supply: PoE or 12V DC, 2A
Features
• Draw both power and time updates from the network
• Power over Ethernet (IEEE802.3af)
• Supports up to 5 SNTP servers for redundancy
• DHCP or Static IP addressing
• 12/24 Hour Mode with PM indicator
• Timezone management ( Factory-set to your time zone)
• Automatic daylight saving time adjustment (where applicable)
• Easy plug and play installation.
• Accuracy ±20 millisecond to NTP/SNTP time server
• Programmable countdowns
• Adjustable brightness settings
• 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
Options include...
* 4-digit or 6-digit displays
* Red/ green/ yellow/ amber digits
* Single-sided or double-sided clocks
* Bell option
* Display time, temperature and humidity alternately
• Timezone management ( Factory-set to your time zone)
• Automatic daylight saving time adjustment (where applicable)
• Easy plug and play installation.
• Accuracy ±20 millisecond to NTP/SNTP time server
• Programmable countdowns
• Adjustable brightness settings
• 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
Options include...
* 4-digit or 6-digit displays
* Red/ green/ yellow/ amber digits
* Single-sided or double-sided clocks
* Bell option
* Display time, temperature and humidity alternately
There will be additional charge for options. If you need options, please specify before you place order.
(1) Bell option. We can add a bell relay into the clock, then you can connect the clock to bell and program the bell to ring at 30 different moments.
Bell Configuration on the management software
(2) Temperature/ humidity display is optional. We can add a sensor to the clock, then it can display time, temperature, and humidity alternately.
Clock with Humiture Sensor
Power Supply and Installation
Power Supply
If PoE is not available, then you can use a power supply adpter with a 5.5mm x 2.1mm plug. You can buy it in local place or buy from us.
Click the below picture to go to the purchase link for our power supply adapters.
Red/ Yellow/ Amber LED clocks: 12V DC, 2A
Green LED clocks: 18V DC, 2A
Green LED clocks: 18V DC, 2A
Installation
For single- sided clocks, it's not necessary to use the installation accessories because on the back side there are two holes for hanging the clocks on the wall; but for double- sided clocks, it is necessary to buy the installation accessories.
Click the below pictures to go the purchase link for accessories.
Management Software
FAQ
Question:
Question:
When there is interruption of network, is there any indication? And will the clock still display correct time?
Question:
Will you charge for the management software?
Answer:
No. It is free. The software is available online at http://www.ntpclock.com/manuals
Hi from Sweden, I am interest to buy this item, but I don’t know if you can send it to Sweden.
Answer:
Yes, we can send it to Sweden, we have CE certificate. By Jan, 2022, Our synchronized clock systems have been sold to 73 countries or regions over the world!
Question:
Hello! Does this clock support IPv6?
Answer:
No, the current version only supports IPv4.
Question:
When there is interruption of network, is there any indication? And will the clock still display correct time?
Answer:
Normally the clock synchronizes with NTP server every 5 minutes. When there is interruption of network, a small dot will appear on the bottom right corner of the LED display and the clock won’t synchronize, so it will be inaccurate slowly, the deviation is about 1 minute per day. As soon as it is connected to network again, it will display correct time automatically and the dot will disappear.
Normally the clock synchronizes with NTP server every 5 minutes. When there is interruption of network, a small dot will appear on the bottom right corner of the LED display and the clock won’t synchronize, so it will be inaccurate slowly, the deviation is about 1 minute per day. As soon as it is connected to network again, it will display correct time automatically and the dot will disappear.
Question:
Can we set up the time without a NTP server?
Answer:
It does require some NTP server, such as a private NTP server or internet based source( internet public NTP server). With that available, it will keep itself accurate and on the money.
Question:
When there is interruption of power supply, will the clock work?
Answer:
The clock doesn’t have a built-in battery, when there is interruption of power supply, it won’t work. But as soon as the clock is connected to power and network, it will display the correct time automatically, no need of manual adjusting.
Question:
Will you charge for the management software?
Answer:
No. It is free. The software is available online at http://www.ntpclock.com/manuals
About Us
GlobalTime Electronic Co., LTD is a manufacturer of synchronized clock systems in Shanghai, China. We feature a complete line of NTP servers (GPS time servers) and synchronized Clocks. With our standing R& D team, GlobalTime
offers a wide range of NTP servers and NTP clocks( Wi-Fi analog/ digital clocks and PoE analog/ digital clocks), radio clocks, CDMA clocks. By providing accurate, real-time information, we keep schools, hospitals, airports, train stations, media houses, power stations, financial institutes, military bases, insurance companies, public security bureaus and other governmental institutes informed and on the same stage.
offers a wide range of NTP servers and NTP clocks( Wi-Fi analog/ digital clocks and PoE analog/ digital clocks), radio clocks, CDMA clocks. By providing accurate, real-time information, we keep schools, hospitals, airports, train stations, media houses, power stations, financial institutes, military bases, insurance companies, public security bureaus and other governmental institutes informed and on the same stage.
By Jan, 2022, Our synchronized clock systems have been sold to 73 countries or regions over the world! At GlobalTime, we value our customers and their satisfaction above all else!
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