GlobalTime Electronic GTT-400 Manuale utente

GlobalTime™NTP Server

Manual of NTP Server

High-Performance, Enhanced Security Network Time Server

Add: Floor 7, Building 4, No. 651, Wanfang Road, Minhang District, Shanghai, China.

Tel: +86-21 3653 1186 Fax: +86-21 3653 1185

Web: http:www.ntpclock.com

Email: contact@ntpclock.com

GlobalTime™NTP Server

Table of Content

Chapter 1 Basic Information of the Device

1.1. Features................................................................................................................................................Page 1

1.2. Applications..........................................................................................................................................Page 1

1.3. Network Protocols................................................................................................................................Page 1

1.4. Mechanical/Environmental ..................................................................................................................Page 1

1.5. Packing List...........................................................................................................................................Page 2

1.6. An Overview of the Server....................................................................................................................Page 2

1.7. Front Panel and Rear Panel...................................................................................................................Page 2

Chapter 2 Installation and Commissioning of the Device

2.1. Structure of the Server..........................................................................................................................Page 3

2.2. Outdoor Installation..............................................................................................................................Page 4

2.3. Indoor Installation................................................................................................................................Page 5

Chapter 3 Operation of the Server

3.1. Indicator Light.......................................................................................................................................Page 5

3.2. Keyboard...............................................................................................................................................Page 5

3.3. Configuration of the Server...................................................................................................................Page 7

3.3.1. Login..................................................................................................................................................Page 8

3.4. Login Server by Internet........................................................................................................................Page 8

3.5. Remote Dial-up Maintenance...............................................................................................................Page 8

3.6. Configuration of Client Program...........................................................................................................Page 9

3.7. Troubleshooting..................................................................................................................................Page 10

3.7.1. Display Wrong Time When Power is on...........................................................................................Page 10

3.7.2. All indicator Lights are off When Power is on..................................................................................Page 11

3.7.3. Can not Receive Satellite Signal for Long Time................................................................................Page 11

3.7.4. Can not Ping the Server................................................................................................................Page 11

3.7.5. Unstable Signal, and the Server is in hold mode sometimes.......................................................Page 11

3.7.6. Clients can not Get Time Service.................................................................................................Page 11

3.7.7. How to Make Network Devices Get Time Service.......................................................................Page 11

Chapter 4 Remote Login............................................................................................................................Page 12

4.1. Login via http..........................................................................................................................................Page 12

4.2. Login via ssh............................................................................................................................................Page 13

4.2.1. Main Login Interface............................................................................................................................Page 14

4.2.3. NTP Configuration...............................................................................................................................Page 14

4.2.4. NTP Status...........................................................................................................................................Page 14

4.2.5. BD/ GPS Status.....................................................................................................................................Page 15

4.2.6. System Information.............................................................................................................................Page 15

4.2.7 System Function...................................................................................................................................Page 15

Chapter 5 SNMP Monitoring.....................................................................................................................Page 15

5.1. Set SNMP TRAP IP Address.....................................................................................................................Page 15

5.1.1. Set SNMP TRAP IP Address via Web....................................................................................................Page 15

5.1.2. Set SNMP TRAP IP Address via NTPSHELL...........................................................................................Page 16

5.2. Introduction of SNMP OID......................................................................................................................Page 16

5.2.1. TRAP OID16.........................................................................................................................................Page 16

5.2.2. Get OID................................................................................................................................................Page 17

GlobalTime™NTP Server

Chapter 6 Specific Performance Index of the Server................................................................................Page 17

Chapter 1 Basic Information of the Device

Modern networks require accurate, secure, and reliable time service. The security-hardened GlobalTime™ NTP

Server is purpose- Built to deliver exact hardware-based Network Time Protocol (NTP) timestamps. The

unparalleled accuracy and security is rounded out with outstanding ease-of- use features for reliable network time

services ready to meet user network and business operation needs today and in the future. High Security and

Capacity.

1.1. 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 10M 100M 1000M adaptive network interface

• NTP Reflector option: 20000 NTP client mode three requests per second

• TOD/1PPS/10MHz out

• MTBF: 90000 Hours

1.2. Applications

• Synchronizes hundreds of thousands of NTP clients

• Security-hardened for peace-of-mind time service operations

• Multiple GbE NTP ports for easy network configuration and adaptation

• Best-in-class time accuracy for improved log file timestamp precision and usability

• Very reliable and easy-to-use network time appliance for modern networks and business operations

1.3. Network Protocols

RFC 1119 1305 NTP v2/v3/v4

RFC 1769 2030 SNTP v2/v3/v4

TIME

DAYTIME

SNMP v1/v2/v3

SSH

HTTPS

FTP

1.4. Mechanical/Environmental

• Size: 48cm x 30cm x 4.4cm, 5kg. 1U rack mount, including BNCs

• Power: 10W, 110-230V AC

GlobalTime™NTP Server

• Operating temperature: -10℃~65℃

• Storage temperature: -40℃~85℃

• Operational humidity: 0~90%, non-condensing, IEC 60068-2-78Cb, IEC 60068-2-30Db

1.5. Packing List

1) Time Server

2) Power cord

3) GPS/BD Antenna and Cable

4) Lightning Arrester

5) GPS/BD Signal Receiver and accessories

1.6. An Overview of the Server

With the rapid development of modern society, higher demand on the time precision and frequency is put on the

agenda. Nowadays with the development of modern digital communication networks and the information

superhighway construction, the political,cultural, technological and social information coordination is based on a

strict system of time synchronization, especially in the communications, electricity, financial securities, computer

networks production line operation, administration and national defense and other fields urgently need the time

synchronization equipment.

Global Positioning Satellite (GPS) signals act as the reference source of GTT-400 network time server. The time

reference contained in the GPS satellite signals synchronizes with the universal time coordinated (UTC). The

long-term frequency stability has achieved the10-13 level of magnitude of cesium atomic clock, which is

equivalent to be only 1 second slower during 30 years. To adjust local time with this reference signal can eliminate

the accumulation of deviation resulted from the low accuracy of local clock time and also can greatly improve the

timing precision of the server.

GTT-400 network time server use the professional GPS timing receiver. It can receive and lock the satellite signal

fast and reliably.

NTP protocol (Network Time Protocol) is a common international network timing protocol. Its principle is to

launch a time polling to the server after an interval of time through the client. According to a certain filtering

algorithm it can calculate the time deviation between the server and the client as well as the propagation delay

caused by network transmission. Then according to these two parameters to adjust the client's local time and

make it consistent with the server. Compared to other time calibration protocols, NTP protocol can eliminate the

impact caused by network transmission delay, so it can provide high-precision timing services. Detailed

description can be referred to the latest protocol standards documents RFC1305 and RFC2030. GTT-400 network

time server can be compatible with NTP v2 / v3/v4 in various versions.

1.7. Front Panel and Rear Panel

GlobalTime™NTP Server

1) Font Panel

• OLED display in green, 64x256 resolution, to show the status of the device and the UTC time

• The keyboard for checking and configuration

• 6 indicator light

2) Back Panel

• Two power sockets with fuse . After opening the fuse base, there are a primary and a reverse fuse with

specification of 0.5A on each side to facilitate users’ replacement

• One antenna plug as well as 50 Ω BNC Socket on the panel

• Four 10/100M/1000M adaptive network ports

• One USBhost for upgrading the program and back up of the configuration

• One dry contact relay for alarming

Chapter 2 Installation and Commissioning of the Device

2.1. Structure of the Server

The server consists of the outdoor part and interior part. The outdoor part is composed of the GPS satellite

receiving antenna, lightning arrester and antenna amplifier (optional). The function is to complete the reception

of satellite signals.

The interior part is the master device of GTT-400 network time server to complete the functions of the satellite

GlobalTime™NTP Server

signal demodulation, the local clock calibration, achieving NTP protocol and so on. It provides NTP timing service

to other network equipment by 10M network ports. Below is the detail installation method of the outdoor part

and the interior part.

2.2. Outdoor installation

The outdoor part is composed of the GPS satellite receiving antenna, transmission cables and antenna amplifier.

The installation attentions are as follows:

At first, the antenna installation location needs to be carefully selected, which will significantly influence function

of equipment. The antenna should be installed in high position, and can not be blocked by, such as the roof, open

top, etc. If you want to achieve better results, you’ d better keep the elevation angle of 15 degrees from blocking.

Please do not install the antenna inside the room, because GPS satellite signal is very weak and can not be

received indoors. It does not matter if there are trees or plastic rain shelter above the antenna, but other block

will influence the signal significantly. Actually, only a book above the the antenna can completely block out the

satellite signal.

Second, antenna installation should be lower than the lightning rod or other constructions that can attract

lightning stroke and the installation location should better be 10-15 meters away from them. GPS antenna itself is

rarely struck by thunder blot but is often damaged by the strong induced electric field resulted from the stuck

buildings (the lightning rod, tower, etc) around. In this circumstance, we should install the arrester in the cable.

Normally the

arrester will be installed at the position where the cable goes through the wall. In this way, the arrester can be

well earthed. The arrester should also be installed between the feeder and the server. Then lead the grounding

wire from the arrester and connect it to the earth.

The earth resistance should be under 4 Ω and must be firmly connected to ensure the reliable discharge by

lightning.

Sometimes the antenna can be installed outside the window, but the building must be located in the open fields

with no corner. In this way, it can receive at least half of the satellite signal. But as a long-term using equipment , it

is recommended that the antenna is installed in high places, while the outside installation can be only adopted for

test.

The high-power microwave transmitting of the same band can not be around where the GPS antenna is installed.

In addition, we should try to avoid the GPS antenna from the direct irradiation of high-power electromagnetic

radiation.

If the length of the feeder is shorter than 100 meters, the antenna and equipment can be directly connected; for

feeder between 100 meters to 200 meters, one amplifier is needed; for feeder between 200 meters to 300 meters,

two amplifiers are needed. If you need longer feeder links, please contact us, GlobalTime Electronic Co., Ltd. We

will provide the special program to you. The feeder usually adopt 1 / 2 inch RF cable whose loss is 12.8dB/100m

from the United States Andrew's.

Special attention for setting up the feeder:

1. Do not bend the feeder too much, because it will result in a broken feeder conductor.

2. When we connect the feeder into the interior, it should be bent into U-shape to prevent t water

from flowing backward.

GlobalTime™NTP Server

Technique Index of Antenna

Frequency Range:

1575 +/- 50MHz

RF Connector:

N Type

Polarization Mode:

Right Handed circular

polarization

Installation Method:

Screw (M24 x 1.5)

Connector

Antenna Gain:

≥3.5dB

Volume:

Ø96 x 126mm

Amplifier Gain:

≥37dB

Operating Temperature:

-45℃to 85℃

Noise Figure:

≤1.5dB

Storage Temperature:

-50℃to 90℃

Interference Suppression:

25dB( f0+/- 100MHz)

Humidity:

0 to 100%

Power Consumption:

3V x 20mA

2.3. Indoor installation

After connecting 220V AC to the master device, the indicator light "Power" on the front panel will light which

indicates the running of power supply is normal. To measure the BNC antenna socket with a multimeter, the feed

voltage should be up to 5V.

Then connect the antenna cable with the antenna socket.

Next, use a computer to pass through the IP address and network settings of the serial port configuration time

server, save and exit, then restart the server to make the network settings take effect. After reboot, input the IP

address of the PING server in another computer to check the network settings correct or not.

Last, log on the network time server through Telnet to observe the satellite receiving state, the information on

time tracking state of the server and so on. When the server locks the satellite time ( The indicator light on the

panel turns green), the server starts to provide time information to other clients within the network. The specific

process of software configuration can refer to the following chapter.

Chapter 3 Operation of the Server

3.1. Indicator Light

Indicator light Status

Indicator

Status

Instruction

Power Supply

The power supply is normal

OFF

The power supply is abnormal

NTP

OFF

The server is unlock and is searching for time source

GREEN

The time source is locked

SAT

OFF

The satellite signal is not received

GREEN

The satellite signal is received

FREQ

OFF

No back-up frequency source or OCXO is not used currently

GREEN

Back-up frequency source is working

Alarm

OFF

Normal

GREEN

CPU occupation is beyong the limite (70%)

3.2. Keyboard

When the server is turned on, the default display is as below:

GlobalTime™NTP Server

1. Password is needed to enter into the main menu. Click the key “OK” , then enter the password. The default

password is “123456”, the password can be changed under the main menu. When we enter the correct password,

we can go to the main menu for configuration. We can click the back button to cancel the password.

2. Main Menu

3. Click the key “up” and “down” to choose the menu and click the key “OK” to enter into the menu.

4. When we choose the menu “NETWORK”, it will display (1) independent network (2) bound0. Please choose (1)

and click the key “OK” to set the network. We can click back button to go to the previous menu.

Remarks: (2) boud0 is not available currently.

4-1 Goes into independent network menu and click the “up” and “down” key to choose ETH0, ETH1, ETH2, ETH3

for configuration. We need to click the key “OK” to confirm the choice each time.

4-2 After we choose a ETH, it will display IP, netmask, gateway for configuration. We need to click the key “OK” to

confirm the choice each time.

Remarks: Because the keyboard does not have “.”, so when we enter IP, the key “up” will work as “.” . Please click

the key “OK” to save the configuration and input the next mask.

5. When we choose NTP STATUS, the menu will display as below

GlobalTime™NTP Server

“Stratum” means the level of the server; “rootdisp” (ersion) means the accuracy of the time source; “source”

means the current locked time; “reach” means if the recent 8 times of time source data is reliable.

6. When we choose SATELLITE STATUS, it will display the current numbers of the GPS and BeiDou satellites.

7. When we choose SYSTEM INFORMATION, it will display as below

“Uptime” shows the lengths of time the server has been working.

“version” means the version of the software.

3.3. Configuration of the Server

The server GTT400 has four 10M/100M/1000M adaptable Ethernet interface. The default IP of ETH0, ETH1, ETH2,

ETH3 is 192.168.0.8, 192.168.1.8, 192.168.2.8, 192.168.3.8. Every ETH support ping, thus we can check if the

configuration is successful.

We can manage the server trough the local serial cable connection or the remote ssh connection. We need to use

a crossed serial cable with connectors on both ends (the 2, 3 feet of the two ends should be cross connected) to

manage the server on the Hyper-terminal. The configuration of the Hyper-terminal is as below:

GlobalTime™NTP Server

As to remote ssh connection, we only need to enter ssh <IP of the server> as command. We will introduce the

method of management through local connection here. The remote management method is the same.

3.3.1. Login

It will display linux shell interface after login, we can manage and do configuration to the system.

3.4. Login Server by Internet

For security, the server support ssh login. The login interface is as the below picture shows

3.5. Remote Dial-up Maintenance

We can use the MODEM to achieve remote dial-up maintenance with the serial monitoring

port of the server. Please see the following steps:

Initially, set the MODEM to auto answer mode and connect the MODEM and a computer serial port with a serial

cable. Set the Hyper-terminal like the below pi

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