DTS 4135.timeserver

DTS 4135 - the innovative, precise time reference for networked,
multifunctional systems

Time precision

Best accuracy can be achieved by synchronizing the DTS 4135.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 networks

The high performance DTS 4135 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 (client and server at the same time).

NTP authentication

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

Safe and convenient operation

After configuring an IP address via serial interface (terminal program), 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.

Effective 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 4135.timeserver - Front view


  • LAN connector RJ 45, 10/100 Mbit
  • PC terminal connector, RS232 Sub-D 9p male
  • USB connector for software update, fi le download to the DTS 4135 (e.g. telegram fi les, timezone table, etc.) and maintenance

LEDs: Mains power, alarm, synchronization and network transmission control

Display: Time, date, status, alarm, IP, etc.


Rear view

DTS 4135.timeserver - Rear view


  • Power: Mains power connector, 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: 2 RS 232/485, both for script file progr. serial message
  • IRIG: 2 IRIG-B/AFNOR outputs (BNC)
  • IRIG DC: 2 DC level IRIG-B/AFNOR outputs (both RS 422 & optocoupler)
  • Pulses: 2 DCF or pulse/frequency outputs (both RS 422 & optocoupler)


DTS 4135 - the time source for LAN-based clock and time distribution systems

The DTS 4135.timeserver is a versatile time reference in several respects.

On one hand, it relays the external time signals with maximum precision and reliability. It is compatible with all NTP unicast (IP based) or multicast devices, such as slave clocks with NTP movement (e.g. NBU 190), digital clocks and DTS 4135 - the time source for LAN-based clock and time distribution systems digital information displays with NTP synchronization. On the other hand, it can also synchronize the NMI (Network Management Interface), which can synchronize master clocks with MOBALine and DCF 77 output.

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


DTS 4135.timeserver - time source for LAN-based clock and time distribution


DTS 4135 - highest priority for availability and reliability

Redundant NTP server operation

To avoid time deviation between two DTS 4135.timeservers, they can be linked via a fiber-optic connection by using two GBIC modules.

The two time servers automatically negotiate their state as master or slave. The slave is always synchronized by the master. In case of GPS failure, an automatic swap between master and slave state will occur. The parameters for the swap can be configured.The “master” DTS timeserver always has the better NTP stratum level than the slave.

DTS 4135.timeserver - redundant Operation


Redundant power

The DTS 4135.timeserver has several monitored power inputs for completely redundant power supply. The non-active power supply input is also monitored.

Possible power variants:

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

DTS 4135.timeserver - Redundant Power

Redundant outputs

Redundant IRIG-B/AFNOR, serial telegram, DCF and/or pulse/frequency outputs can be achieved by an External Change Over unit (ECO).


DTS 4135 - versatile high precision master clock and NTP time server

DTS 4135.timeserver as NTP server and master clock for high precision IRIG-B/AFNOR outputs, for RS 232/485 serial messages and technical pulses or frequencies.

 DTS 4135.timeserver - versatile high precision master clock and NTP time server

The DTS 4135.timeserver features two IRIG-B/AFNOR outputs to synchronize analog and digital slave clocks, process controllers, voice recording systems and many other technical equipment.

The DTS 4135.timeserver also features two RS 232/485 serial outputs. Programmable messages with script file allow the synchronization of any kind of technical equipment like e.g. computer server, process controller, fire supervision system, etc.

For utmost precision of the synchronization, two high accurate pulse outputs are provided. They can either be used as DCF outputs (RS 422 and optocoupler) or 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.