Buy direct from us or via one of our resellers here:


LeoNTP Time Server 1200 is a Stratum 1 Master Clock / Time server with GPS synchronised clock source designed from the ground up with the sole purpose of providing a cost effective but highly accurate and extremely high performing networked time server. Extremely easy to setup and configurable with flexible power options USB/PoE (802.3af) it can provide accurate synchronised time for your LAN, WAN, CCTV, PLC, Telephone systems or anywhere accurate standalone time is required.

Optional 1U rackmount for mounting one,two or three units (Rack mount kit comes with shelf, screws and 2 blanks. Each kit can take one, two or three LeoNTP 1200 units)

Optional DIN Rail Mounting Kit (See related items)

Unit can sustain 100Mbps (> 100,000 NTP Packets a second) 

Traditional Master Clocks either have high performance or low cost. With LeoNTP Time Server 1200 you can have both in the same package.

Key Features

  • True Stratum 1 NTP Compatible Master Clock / Time Server.
  • Can serve tens of thousands of clients.
  • Very cost effective
  • Supports NTP/SNTP
  • Front TFT Display for time display and configuration

10/100Mb RJ45 Autosensing
IPV6 SLAAC/Static (DHCPv6 not supported)


NTP V2, V3, V4, SNTP V3, V4

NTP Requests/sec

>100K (Wire speed) per unit.
> 1million concurrent clients typical


72 Channel
-167dBm Sensitivity
Power for active antenna supplied via bias tee.


USB/ 48V PoE 802.3af

Timing Performance

GPS Accuracy

30ns RMS, 60ns 99%
Cold Start acquisition < 30s

NTP Accuracy

< 1µS

Hold over on loss of GPS signal

Typically 1-4ms in 24 hours
Reverts to Stratum 16 after 24 hours with no GPS

Mechanical Dimension

140mm x 170mm x 45mm

BNC Output

PPS/1Mhz/10Mhz Accuracy 30ns RMS, 60ns 99%


1 year RTB
Lifetime Firmware updates and support.

In The Box 

1 x LeoNTP Time Server 1200 Device
1 x GPS Puck Antenna with 3 meter cable
1 x USB Cable
1 x 2 meter RJ45 Patch Cable

See associated items for external timing antenna and BNC to MCX cables.


LeoNTP 1200 Time Server Manual

Latest Firmware

Frequently Asked Questions:

Q/ Is this unit based on Linux and NTP ?
A/ No the hardware and code running it are completely propriety and don’t use any source code from Linux or NTP. This is done to ensure maximum performance with no overheads and security issues.

Q/ Can I configure it via HTTP/Telnet ?
A/ No. Running a web server on this device although entirely possible would reduce the performance of the unit. Therefore we took the decision to just do configuration via the front panel.

Q/ The performance figures look too good to be true at the price
A/ The performance figures are the result of a focused determination to get the best performance out of the hardware. By not using off the shelf hardware and software we have no overheads or compromises. Try it yourself using Miroslav Lichvar's ntpperf tool. It only starts to drop when the 100Mb interface is maxed out:

nevis@test:~/ntpperf$ sudo ./ntpperf -i enp5s0 -m 70:B3:D5:E3:D0:04 -d -s -B
               |          responses            |     TX timestamp offset (ns)
rate   clients |  lost invalid   basic  xleave |    min    mean     max    rms
1000       100   0.00%   0.00% 100.00%   0.00%
1500       150   0.00%   0.00% 100.00%   0.00%
2250       225   0.00%   0.00% 100.00%   0.00%
3375       337   0.00%   0.00% 100.00%   0.00%
5062       506   0.00%   0.00% 100.00%   0.00%
7593       759   0.00%   0.00% 100.00%   0.00%
11389     1138   0.00%   0.00% 100.00%   0.00%
17083     1708   0.00%   0.00% 100.00%   0.00%
25624     2562   0.00%   0.00% 100.00%   0.00%
38436     3843   0.00%   0.00% 100.00%   0.00%
57654     5765   0.00%   0.00% 100.00%   0.00%
86481     8648   0.00%   0.00% 100.00%   0.00%
129721   12972  15.49%   0.00%  84.51%   0.00% <- 100Mb Interface Saturated
194581   16384  43.65%   0.00%  56.35%   0.00%
291871   16384  62.43%   0.00%  37.57%   0.00%

Q/ Can the unit be firmware updated?
A/ Yes via USB into a Windows PC or Mac. Updates take about 5 seconds to apply.

Q/ Is the BNC output compatible with the Airspy
A/ Yes. Set the BNC output to 10Mhz. Connect the unit to your Airspy via the optional BNC to MCX cable and power the Airspy on.

Q/ Can the unit display my local time ?
A/ Yes. Press the button on the clock screen and use the knob to select your time zone.

Q/ Whats the maximum length of coax to the antenna ?
A/ This depends on the antenna and coax. We've tested our timing antenna (comes with 10 meters of coax) with a 20 meter extension and it works fine. The unit is POE so it may be easier to run a network cable closer to the antenna and install the unit there.

Q/ Does the unit support IPv6
A/ From firmware 2.06 IPv6 via SLAAC or Static allocation is supported (DHCPv6 isn't supported)

Q/ What happens on loss of GPS Signal
A/ The unit enters failover mode which uses internal compensation to maintain the accuracy of the timing to 1-4ms typically over 24 hours. After 24 hours with no GPS signal the unit reverts to being a Stratum 16 time source.

Q/ Leap Second Support
A/ The unit has leap second support and a count down timer to the next leap second insertion. 

LeoNTP Time Server 1200

  • Product Code: HAB-LEONTP-1200
  • Availability: 4
  • £600.00

  • Ex Tax: £500.00

Available Options

Related Products

GPS Base Antenna with mount

GPS Base Antenna with mount

Active GPS BaseAntenna with built in LNA & SAW Filter. Supplied with 10 or 30 meters of RG58 ter..

£47.99 Ex Tax: £39.99

BNC to MCX Extension Cable

BNC to MCX Extension Cable

BNC male attached to a 60cms piece of RG174 coax cable terminated with an MCX Plug suitable for conn..

£9.59 Ex Tax: £7.99

Prestigeline Networked LED Clock

Prestigeline Networked LED Clock

Large display network clocks with PoE+ Option.The device can be used both inside and outside and are..

£315.00 Ex Tax: £262.50

GPS Antenna Signal Splitter with SMA

GPS Antenna Signal Splitter with SMA

GPS Antenna Signal SplitterProduct OverviewGPS L1 - L5, GLONASS, Galileo splitterLow Insertion Loss ..

£119.99 Ex Tax: £99.99

LeoNTP  Time Server 1200 Rackmount Kit

LeoNTP Time Server 1200 Rackmount Kit

1U rackmount for mounting one,two or three units (Rack mount kit comes with shelf, screws and 2 blan..

£120.00 Ex Tax: £100.00

LBE-1420 GPS locked clock source

LBE-1420 GPS locked clock source

Replacement for Mini Precision GPS Reference ClockLow jitter GPS-locked frequency clock source1 Hz t..

£132.00 Ex Tax: £110.00

LeoNTP  Time Server 1200 DIN Rail Mounting Kit

LeoNTP Time Server 1200 DIN Rail Mounting Kit

DIN Rail mounting kit for the LeoNTP 1200 Time Server.Supplied with clip, plate and 2 screws to atta..

£59.99 Ex Tax: £49.99

Tags: NTP Clock