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Net Master Clock NMC

»The Master Clock for Networks«

The Net Master Clock NMC is a master clock, developed especially for network environment.
It is able to control self-setting MOBALine or IRIG-B / AFNOR slave clocks and is used as an accurate NTP time reference (Time Server) for computer systems. The NMC can be synchronized by a time signal receiver (DCF 450 or GPS 4500) and/or by NTP time servers (LAN / Internet). On the RS 485 line self-setting slave clocks can be operated and monitored.
By the DCF current loop output other devices (e.g. master clocks) can be synchronized. The Net Master Clock is equipped with 4 alarm inputs to monitor other connected devices. Alarms are signaled by a relay, with SNMP traps or by e-mail.

Example: NMC e.g. as a master clock for monitored slave clocks

 

NMC front: LEDs and connectors

LEDs: Mains power, alarm, synchronization and network transmission control.
Connectors: LAN connector RJ45 (10 / 100 Mbit), PC terminal connector (RS 232 Sub-D 9p)

NMC rear: Connectors

Connectors: Mains power connector, DC power supply input, 4 alarm inputs, DCF input, DCF or pulse output, MOBALine or IRIG-B / AFNOR time code output, RS 485 clock line, DC power supply output, alarm relay contact.

Specifications

Technical Data

Time signal outputs

MOBALine: for up to 100 slave clocks (700mA)
NTP / SNTP (server)
RS 485: for up to 31 SU 190 movements
DCF time code output (current loop passive)
Option: IRIG, AFNOR, DCF-FSK: Ri < 600 ohm
(IRIG instead of MOBALine)

Network services

NTP client
NTP server, max. requests: 100 requests / sec.
SNMP traps
E-mail for alarm messages (2 addresses)
Time, Date, FTP (for update)
Time synch. and monitoring from MTC

Network interface

10BaseT / 100BaseTX (IEEE 802.3)
Auto-negotiation / manual
Connection: RJ45

IP configuration

DHCP, static IP

Serial interface

D-Sub 9 (38400, 8, no parity, 1, no handshake)

Operating control

Software terminal at RS 232
Telnet

LED indication

Power supply, synchronization status, LAN monitoring, alarm

Local time calculation

Automatically, preprogrammed season time change over
Up to 80 predefined time zone entries
20 entries programmable on PC for download
All outputs can be individually allocated to a time zone (UTC or local time)

Accuracy

GPS (DCF input) to NTP server: typical +/- 3ms
NTP client to NTP server: typical +/- 3ms
GPS (DCF input) / NTP client to clock lines: typical +/- 5ms
Time deviation free running (at 20..25°C): 0.1 second / day
(After 24 hours synchronization from time source)
Remark: With NTP synchronization the accuracy may be lower, depending e.g. network - topology, traffic ...

External time source

External NTP / SNTP servers (4 NTP sources programmable) and / or
DCF 77 time signal receiver (current loop, e.g. DCF 450) or
GPS time signal receiver (current loop, e.g. GPS 4500)

4 inputs for alarm contact

To connect external devices

Alarm relay

Potential free close contact for the signalization of alarms

Power supply

AC input: 85..250 VAC, 50 - 60 Hz
DC input: 22..30 VDC / 1.5A (> 28 V required for MOBALine)
DC output: nominal 28 VDC, max. 400 mA, to supply SU 190 movements and / or GPS 4500

Dimensions

19“ rack mounting, 1 height units
w x h x d mm: 483 x 44 x 125

Running reserve

none

Ambient temperature

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