DTS 4138.timeserver

DTS 4138.timeserver - the innovative and precise time reference
for LAN-based devices

Time precision

Best accuracy can be achieved by synchronizing the DTS 4138.timeserver via a connected GPS receiver, and  thanks to an intelligent time management. The internal time is adjusted to the time reference (e.g. GPS) in one step or slowly shifted (in adjustable micro steps) to avoid any time leaps (e.g. after a longer loss of the time source). To achieve utmost accuracy, the quartz drift and aging is continuously compensated

Top performance - even for large network

The high performance DTS 4138.timeserver can reply more than 250 NTP and SNTP requests per second. It can also work as an NTP time reference for a network, being synchronized from a superior NTP-Server in a physically separated network (client and server at the same time).

NTP authentication

Supports NTP authentication for increased security, which allows the clients, to verify the source of the received NTP packets.

Safe and convenient operation

Operation over LAN via MOBA-NMS (SNMP), Telnet, SSH or SNMP protocols is possible. SSH and SNMP (MD5 authentication and DES for encryption) enable a secured connection. Special software is required for operation by SNMP protocol.

Fault indication

Alarms are reported by alarm relay, by e-mail, or via SNMP messages. Additionally, the display can be used to check the alarm state by pressing the red push button.


Front view

DTS 4138.timeserver Front view


  • 2 LAN connectors RJ 45, 10/100 MBit Ethernet
  • USB connector for software update, file upload to the time server (e.g. telegram files, time zone table...) and maintenance

LEDs: Power, alarm, synchronization and network transmission control.Display: Time, date, status, alarm, IP...


Rear view

DTS 4138.timeserver Rear view


  • Power: 2 DC power supply inputs, DC output (e.g. for GPS)
  • Alarm: alarm relay contact, alarm input
  • Synch. inputs: IRIG-B/AFNOR input (BNC), DCF current loop
  • Synch. outputs: DCF current loop, DTS link (GBIC-module)
  • Serial: 1 RS 232/485, for script file programmable serial message
  • IRIG: 1 IRIG-B/AFNOR output (BNC)
  • IRIG DC: 1 DC level IRIG-B/AFNOR output (RS 422 & opto coupler)
  • Pulses: 1 DCF or pulse/frequency output (RS 422 & opto coupler)


DTS 4138.timeserver - the time source for LAN-based clock and time distribution systems

The DTS 4138.timeserver is a versatile time reference in several respects. On the one hand, it relays the external time signals with high precision and reliability directly to all NTP unicast (IP based) or multicast devices, such as slave clocks with NTP movement (e.g. NBU 190, ...), digital clocks, and digital information displays with NTP synchronization. On the other hand, it can also synchronize the NMI (Network MOBALine Interface), which can synchronize master clocks and slave clocks with MOBALine and DCF 77 output.

Even PCs/workstations, photocopiers, printers, fax equipment, time recording terminals, access control systems, central fire alarm systems, image and sound recording equipment, and many other kind of clients in the network can be directly synchronized by means of the network time protocol (NTP).

time source for LAN-based clock and time distribution systems



DTS 4138.timeserver - greatest priority for accuracy and reliability

Redundant NTP server operation

To avoid time deviation between two DTS 4138.timeservers, they can be linked via a fiber-optic connection by using two GBIC modules.

The two timeservers automatically negotiate their state as master or slave. The slave is always synchronized by the master. In case of GPS failure, automatic swap between master and slave state will occur. The parameters for the swap can be configured.

The “master” DTS time server always has the better NTP stratum level than the slave.

DTS4138.timeserver - Redundant NTP server operation


Redundant power

The DTS 4138.timeserver has two monitored inputs for entirely redundant power supply. The stand-by power supply input is also monitored.

Possible power variants:

  • 24 VCD, non-redundant
  • 24 VDC + 24 VDC, redundant

Redundant outputs

Redundant IRIG-B/AFNOR, serial telegram, DCF and/or pulse/frequency outputs can be achieved by an external change over unit.

Redundant power



DTS 4138.timeserver, versatile high precision master clock and NTP time server

DTS 4138.timeserver as NTP server and master clock features one high precision IRIG-B/AFNOR output, one RS 232/485 serial interface and one technical pulse or frequency output.

 DTS 4138.timeserver, versatile high precision master clock and NTP time server

DTS 4138.timeserver features one IRIG-B/AFNOR output to synchronize analog and digital slave clocks, process controllers, voice recording systems and many other technical equipment.

DTS 4138.timeserver also features one programmable RS 232/485 serial output (message definable by script file), for synchronization of any kind of technical equipment like e.g. computer server, process controller, fire alarm system, ...

For utmost precision of the synchronization, one high accurate pulse output is provided. It can either be used as DCF output (RS 422 and opto coupler) or for periodical pulses.

Typical applications are industries, power distribution stations and power plants, where high reliability, high precision, no time leaps and permanent availability are required.