Overview and introduction of time system equipment (NTP time service server)

Time:2020-10-13

Overview and introduction of time system equipment (NTP time service server)

Overview and introduction of time system equipment (NTP time service server)

Beijing Zhun electronic technology official micro enterprise — ahjzsz

summary 

The integrated time system is a highly reliable and multi-functional time and frequency equipment which is flexible and extensible for multiple fields of time and frequency applications. It innovatively adopts the design of full modular plug-in box based on CAN bus, the centralized monitoring of the whole system based on Linux, and the time taming and punctuality technology with full independent intellectual property rights GPS, Beidou and other multi reference source input and multi type time-frequency signal output can be flexibly configured on demand, which can realize real-time fault diagnosis and disposal at system board level, as well as SNMP, UDP, console It can be widely used in defense and military industry, aerospace, government finance, mobile communication, radio and television, transportation energy, scientific research institutes, industrial control, measurement and calibration and other fields.

characteristic 

L. input module: it supports GPS, Beidou, PTP, B code and other external reference sources. It can support up to 4 channels of external reference input at the same time, and the priority can be set

 

L) output module: provide NTP, PTP, Tod + PPS, B code (DC, AC), 10MHz (sine wave, square wave), 2.048MHz (square wave), etc

 

L. cascade expansion: support the cascading use of plug-in boxes, which is convenient for users to further expand their use

 

L. centralized monitoring: the system centralized monitoring can monitor the working voltage, temperature and core signal parameters of all functional modules of the whole system in real time

 

L. redundant backup: it supports the dual redundancy backup of power supply, time frequency and time-saving core modules. It can diagnose the fault in real time and complete the master-slave switch independently

 

L. time keeping unit: it can be selected or selected, crystal oscillator, rubidium clock, double crystal oscillator, double rubidium clock, crystal oscillator + rubidium clock

 

L. rich protocol: support SNMP, UDP, console and other protocol management control interfaces, easy to centralized monitoring and unified maintenance management

 

L. rapid customization: on this basis, we can quickly realize customized services for special needs

 

  Equipment appearance drawing, for reference only, subject to the actual object

 

Monitoring software diagram, for reference only, subject to the actual object

 

Technical indicators: 

Input module 

L GPS input

Receiving GPS L1, C / a code signal 1575.42MHz, 16 channels; timing accuracy better than 30ns (RMS)

The positioning accuracy is better than 3m (RMS), cold start: < 29s; hot start < 1s

L Beidou input

Receiving Beidou II B1 signal, 1561.098mhz, 16 channel timing accuracy better than 30ns (RMS)

Positioning accuracy is better than 3m (RMS), cold start: < 35S; hot start < 1s

L GPS Beidou input

GPS Beidou antenna input, the index is the same as above

Other indicators of satellite input module:

Frequency accuracy of satellite receiving module: better than ± 1 × 10-12 

Working mode of satellite receiving module: positioning mode, tracking mode and position keeping mode

Receiving sensitivity: capture ≤ – 148dbm, tracking ≤ – 160dBm, longest feeder without amplifier: 400m, with antenna transmission delay compensation function

L PTP external reference input

IEEE1588 slave clock

Slave clock source accuracy: PTP synchronous timing accuracy 30ns (direct network) supports ieee1558-2002 and ieee1558-2008 protocols

 

Clock module 

L constant temperature crystal oscillator

The accuracy of time keeping is less than 20us (24h), and the second stability is better than 5e-12

Rubidium atomic clock

The time keeping accuracy is less than 1US (24 hours), and the second stability is better than 3e-11

 

Power module 

L AC power supply

220Vac±20%,47Hz~63Hz 

L DC power supply

–38.4~–72Vdc 

Management module

One RS232 and one RJ45 network interface.

Fault and alarm function: support real-time automatic alarm reporting (including number of receiving satellites, signal-to-noise ratio, positioning information, hardware failure, etc.) and indication

Information storage and reporting: information other than alarm, such as clock working status, is temporarily stored in the device for network management system polling or query; 4000 pieces of latest information are saved.

Security management: with three levels (data reading, modification, user password editing) security management.

 

output module  

L NTP output

NTP, SNTP network timing protocol

It can be used as a slave server to synchronize with other NTP network time servers. The user terminal synchronization timing accuracy: 1-10ms (typical value of LAN)

NTP requests: 1000 times / sec

L PTP output

Support ieee1558-2002 and ieee1558-2008 protocol master clock source accuracy: 30ns (direct connected network)

Support single / double step, unicast / multicast, E-E / P-P mode

L b time code output

B (DC) TTL level is better than 100ns B (DC) 422 level, better than 200ns B (AC), better than 10 μ s

L 10MHz output

Standard sine wave, amplitude 12 ± 1dbm, 50 Ω

Accuracy: < 1e-12 (satellite lock, day average) < 5e-10 (hold for 1 day, constant temperature crystal oscillator) < 5e-11 (keep for 2 days, rubidium atomic clock)

Stability: 1s < 5e-12 (constant temperature crystal oscillator); 1s < 3e-11 (rubidium atomic clock)

Phase noise (constant temperature crystal oscillator)

1  kHz≤-140dBc/Hz;10kHz≤-150dBc/Hz 

L 1PPS output

TTL level, square wave, 50 Ω

Timing accuracy: less than 30ns (RMS) pulse width: 100ms

Polarity: positive pulse, rising time: < 10ns

L TOD serial output

9600-n-8-1, time system, etc

 

L E1 output

2.048MHz: square wave, 75 Ω

2.048mb/s (E1): 75 Ω, HDB3 encoding, with synchronous status indication SSM, the function meets the requirements of article 6.4 of GB / T 7611-2001

The drift meets the requirements of ITU-T Recommendation g.811, and the waveform conforms to ITU-T G.703

Jitter performance: in accordance with ITU g.823

 

Machine parameters

 

Size: 3U chassis 447 × 133.5 × 450mm

 

Weight: < 10kg

 

Working temperature: – 10 ℃ – + 50 ℃;

 

Storage temperature: – 25 ℃~ + 85 ℃

 

Humidity: 95% non condensing; power consumption: 60W (typical value)

MTBF: 100000 hours

Other features

 

Serial number

name

call

Standard parameter value

 

 

 

 

 

1

reliability

Full redundancy, no single point of failure caused by the system failure

 

 

 

 

 

2

Frequency accuracy in free oscillation (one year)

It is better than ± 1.6 × 10-8

 

3

Minimum pull in range

±1.6×10-8

 

4

Minimum hold in range

±1.6×10-8

 

5

 

MTIE

Article 4.2.3 in YDT 1012-1999

 

 

 

 

 

 

6

 

TDEV

Article 4.2.3 in YDT 1012-1999

 

 

 

 

 

 

7

 

shake

≤0.05UI

 

 

 

 

 

8

Drift input tolerance

Article 4.2.4 in YDT 1012-1999

 

 

 

 

 

9

Jitter input tolerance

Article 4.2.4 in YDT 1012-1999

 

 

 

 

 

10

Noise transmission characteristics

Article 4.2.5 in YDT 1012-1999

 

 

 

 

 

11

Phase transients and phase discontinuities

Article 4.2.6 and 4.2.7 in YDT 1012-1999

 

 

 

 

 

12

Clock function

Free, fast catch, lock, hold

 

 

 

 

 

13

Frequency generation

Digital synthesis

 

 

 

 

 

14

Input configuration

Support redundant configuration

 

 

 

 

 

15

Synchronous input mode

Support GPS / BeiDou, external clock, 2048kb / s, 2048khz

 

 

 

 

 

16

Number and type of synchronous input

Support 4-channel E1 / 2.048 MHz / 10 MHz input

 

 

 

 

 

17

Input reference selection mode

Mandatory command, signal failure (Los, oof, AIS), SSM quality level, priority

 

 

 

 

 

18

Input reference signal monitoring quantity

Oof, AIS, BVP, CRC, Los, Δ f / F, MTIE, TDEV, raw phase data, SSM

 

 

 

 

 

19

Threshold setting mode of input reference signal monitoring quantity

Support network management to set alarm threshold and alarm level after exceeding threshold value

 

 

 

 

 

 

20

Timing performance monitoring

For timing performance monitoring parameters, it shall be able to provide 1 day of original phase data, with a maximum time of 1-1000 seconds

 

Interval error, time deviation and relative frequency deviation data.

 

 

 

 

 

 

 

 

 

21

Full configuration output capacity of single frame

Explain that the single rack is fully configured with output capacity in 1 + 1 or 1:1 configuration.

 

 

 

 

 

22

Communication function

The communication protocol adopts SNMP protocol

 

 

 

 

 

22

Alarm classification function

It can be divided into event report, secondary alarm, main alarm and serious alarm

 

 

 

 

 

 

 

 

 

The monitoring and management functions are as follows:

 

 

 

 

a) Support alarm location to function module;

 

 

 

 

b) It shall support the provision of event report, minor alarm, major alarm and severe alarm to network management system;

 

 

 

 

c) Support alarm indication and send out audible and visual information at the same time;

 

23

Monitoring and management function

d) The following monitoring and management functions are completed through the device communication interface:

 

 

 

 

1) It can query the working state of each card board; 2) query the working state of clock; 3) check the timing input signal

 

 

 

 

The operation of blocking, opening and switching, modifying the priority and setting the function of SSM; 4) monitoring items

 

 

 

 

Objective to modify the alarm threshold and alarm level; 5) query the monitoring data and alarm information; 6) query the user

 

 

 

 

/Setting and modification of password; 7) manual clearing of alarm.

 

 

 

 

 

24

Network management interface

Supports TCP / IP protocol and multiple telnet connections

 

 

 

 

 

25

Hot swap

support

 

 

 

 

 

26

Rubidium clock life

Over 10 years

 

 

 

 

 

 

  

Appendix: Selection Guide for integrated synchronous system

 

 

Board classification

Code name

name

Slot position

 

Interface definition

 

 

 

 

 

 

 

 

 

Power board

A

220 V / 110 V input board*

2

220 V / 110 V AC power input

 

 

 

 

 

 

 

 

 

B

48V input board*

2

48V DC power input

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

GPS receiver

 

 

 

 

 

 

 

 

 

 

 

 

transport

satellite receiver

B

Beidou receiver

1

2

GNSS antenna signal input

 

 

 

2

Channel TOD output (RS232 level, RJ45 interface)

 

C

GPS / BeiDou dual mode receiver

 

enter

 

 

 

 

 

 

 

 

 

 

 

D

Full frequency receiver

 

 

 

 

plate

 

 

 

 

 

 

 

 

 

 

 

 

 

E

Out of code reference

 

1PPS + TOD (NMEA), 2-way three core aviation plug

 

card

 

 

 

 

 

 

 

 

 

 

External reference

F

PTP external reference

1

1

Route PTP network port (RJ45), 1 channel console port (RJ45)

 

 

 

 

 

 

 

 

 

 

 

 

 

G

B code out reference

 

1

Three channel aviation plug, RS422 level

 

 

 

 

 

 

 

 

 

Acquisition and measurement

H

Power cycle measurement

1

AC power input, the measurement frequency accuracy is better than 0.001Hz

 

 

 

 

 

 

 

 

 

 

 

A

NTP output

1

4

Channel NTP network port output (RJ45)

 

 

 

 

 

 

 

 

 

 

 

B

PTP output

1

2

Channel PTP network port output, 2 channel console (RJ45)

 

 

 

 

 

 

 

 

 

 

C

B (DC) code TTL output

1

TTL / LVTTL: 5-way SMA

 

 

 

 

 

 

 

 

 

 

D

B (DC) code RS422 output

1

RS422: 4-way three core aviation plug

 

 

 

 

 

 

 

 

 

 

 

E

B (AC) code output

1

5

Road SMA

 

 

Output board

 

 

 

 

 

 

 

F

1PPS output

1

5

Road SMA

 

 

 

 

 

 

 

 

 

 

 

G

10MHz sine wave output

1

5

Road SMA

 

 

 

 

 

 

 

 

 

 

 

H

10MHz square wave output

1

5

Road SMA

 

 

 

 

 

 

 

 

 

 

 

I

1PPS + TOD output

1

4

RS232, RJ45

 

 

 

 

 

 

 

 

 

 

 

J

1PPS + TOD output

1

4

RS422, RJ45

 

 

 

 

 

 

 

 

 

 

K

E1 output

1

2.048mhz/e1 (2.048bps) 5-way SMA

 

 

 

 

 

 

 

 

 

 

Time keeping board

A

Constant temperature crystal oscillator

2

1

1PPS of SMA interface and 10MHz of at least one SMA interface

 

 

 

 

 

 

 

 

 

B

Rubidium clock

3

1

1PPS of SMA interface and 10MHz of at least one SMA interface

 

 

 

 

 

 

 

 

 

 

 

 

Management board

A

centralized management

1

SNMP network port (RJ45), console (RJ45), and

 

 

Upper cascade interface (RJ45), lower cascade interface (RJ45)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

remarks

 

L. the system framework is bus modular structure

 

L. at least one power card shall be assembled, and at most two power cards shall be supported

 

L. the centralized management card is a required board

 

L 3U chassis, 21 slots, 15 slots in any combination

 

L. optional input module: GPS, Beidou, GPS + Beidou, time code external reference, PTP external reference (all occupy 1 slot, can select to form redundant reference source)

 

L. optional output modules: NTP, PTP, IRIG-B, 10m, 1PPS, FP, Tod, E1 (all of them occupy 1 slot, which can be selected to form multiple output)

 

L. time keeping unit can be selected: constant temperature crystal oscillator and rubidium clock (embedded in the input module, which does not occupy the slot position. When there is no GPS / BeiDou module, it needs to occupy the slot position separately, and it can be selected to form dual rubidium clock, double constant temperature crystal oscillator or constant temperature crystal oscillator + rubidium clock combination)