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Net Master Clock
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 |
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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 |
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