DTS 4135.timeserver


Technical Data

Time signal outputs

NTP V4 (fully V3 compatible) / SNTP, NTP multicast
DCF-time signal output (optocoupler passive)
2 x IRIG-B/AFNOR output, each with analog (BNC) and DC level (RS 422 and optocoupler) output: RIG-B122, IRIG-B123, AFNOR A, AFNOR C, DCF-FSK, ...
2 x DCF 77, programmable pulses/frequencies (RS 422 and optocoupler)
2 x RS 232/485 serial message programmable by script file

DTS Links

Max. length of the fiberglass cable, e.g. multimode fiber Ø 50 μm: max. 550 m
multimode fiber Ø 62.5 μm: max. 275 m

NTP-slave clock line

For slave clocks synchronization by NTP multicast or unicast (IP based)
Time zone server function with up to 15 different time zone entries.

Network services

NTP client
NTP server, max. no. of NTP and SNTP client requests: typical > 1250 request/sec
SNMP V1, V2c, V3 (get, put, notification, trap) with MD5 authentication and DES for encryption
E-Mail for alarm messages (2 addresses possible)
DATE, TIME, FTP (for update)

Network Interface

10BaseT / 100BaseTX (IEEE 802.3)
Data transmission rate: auto-negotiation / manual
Connection: RJ45 (only shielded cable permitted)

IP configuration

DHCP, static IPv4, IPv6


Serial terminal via RS 232 (front side, sub-D 9p male)
Via LAN: MOBA-NMS, Telnet, SSH, SNMP (special software necessary)
USB connector for software update, maintenance (config. and log files upload) or file download (e.g. telegram files, etc.)

LED indication

Power supply, synchronization status, LAN status, alarm, DCF input


Display for status information: Time, date, IP, alarm, etc. (2 lines with 16 characters)

Local time calculation

Automatic, preprogrammed daylight saving time change
Up to 80 pre-defined time zone entries and 20 user-definable entries
All outputs can be individually allocated to a time zone (UTC or local time)


GPS (DCF input) to NTP server:                        typical < ± 100 μs
GPS (DCF input) to DCF 77 / pulse output:       typical < ± 10 μs
NTP to internal time:                                           typical < ± 100 μs
Redundant operation: master to slave               typical < ± 1 μs
GPS (DCF input) to IRIG (analog)                      typical < ± 100 μs
GPS (DCF input) to IRIG (digital)                        typical < ± 10 μs
Internal time to serial outputs (jitter: ± 10 ms)     typical < ± 10 ms

Time keeping (internal)
DTS 4135 -> TCXO

Synchronized with GPS:                                                     ± 10 μs to UTC
Hold over (after > 24h synch. from GPS) at 20°C ± 5°C:   < ± 10 ms/d or < 0.1 ppm
Hold over (after > 24h synch. from GPS) at constant
temperature:                                                                      < ± 1ms/d or < 0.01 ppm
After restart without synchronization
(for 24h) at 20°C ± 5°C:                                                     < ± 250 ms/d or < 2.5 ppm

DTS 4136 -> OCXO

Hold over (after > 24h synch. from GPS) at 20°C ± 5°C: < ± 1 ms/d or < 0.01 ppm

External time source

External NTP / SNTP server (4 NTP sources possible), or
DCF 77 time signal receiver (optocoupler, e.g. DCF 4500), or
GPS time signal receiver (optocoupler, e.g. GPS 4500), or
IRIG-B 12x/AFNOR (analog)
Manual time setting (only for test purposes)

Alarm relay

Potential free, opening contact for signalizing disturbances  open -> alarm

Alarm input

1 alarm input for monitoring of an external device, 18 - 36 VDC, max. 6 mA  input open -> alarm

Power supply

AC input: 90 to 240 VAC / 50 - 60 Hz / 0.25 A
2 x DC input: 24 VDC +20 % / -10 % / 20 W
DC output nominal 28 VDC, max. 400 mA


19“ rack, 1 rack unit, W x H x D: 483 x 44 x 125 mm


approx. 1.8 kg

Power reserve

No internal active running reserve, timekeeping with RTC for short power outages

Ambient temperature

-5 to +50°C, 10 - 90 % relative humidity, without condensation


Mini GBIC module (GigaBit Interface Converter) SX LC 1000Mbps, 3.3V fiber optic cable,
2xLC/LC50/125μm patch cable FiberChannel duplex 100 cm