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I Technical
data
Dimensions
19“ Rack, 1HE x 28TE (H x B x T [mm]) = 483 x 44 x 125
Weight
approx. 1.35 kg
Ambient temperature
-5 to 50ºC, 10-90% relative humidity, without condensation
Operation Serial
int
erface (via RS 232) o
r Telnet/SSH as well as MOBA-NMS (via LAN)
In addition, operation is also possible with SNMP.
Accuracy
GPS (DCF input) to NTP server:
typical < +/- 0.5ms
DCF 77 radio receiver to NTP server:
typical < +/- 5ms
1)
NTP client to NTP server:
typical < +/- 0.5ms
GPS (DCF input) or NTP client to clock line:
typical < +/- 0.5ms +
accuracy of the clock line
1)
If necessary the DCF source has to be adjusted with an offset
(see
menu:
2
Local time source setting
3 DCF/GPS source correction
).
Important:
NTP reception (DTS 480x as client and / or as server to external clients)
can be influenced by the network traffic load and network devices (Hub,
Switch, Router, Firewall...). If many clients request simultaneously, the
typical accuracy may not be reached. Requirement for NTP accuracy: Poll
interval: minimum 3, maximum 6.
Time keeping (internal) After at least 24 hours synchronization from the time source:
< +/- 0.1 sec. / day (< 1ppm), measured over 24 h, at 20°C +/- 5°C.
During power break (based on internal RTC):
< 5 ppm, but with jitter of +/- 15 ms, measured over 24 h,
at 20°C +/- 5°C.
After a power failure the RTC time is available during at least 5 days
(RTC buffered through a SuperCAP).
Time server
NTP V4
(fully V3 compatible), (UDP), RFC 1305 (Port 123)
NTP Authentication with MD5 Key / Autokey
SNTP
(UDP), RFC 2030 (Port 123)
TIME
(TCP/UDP), RFC 868 (Port 37)
DAYTIME
(TCP/UDP), RFC 867 (Port 13)
Max. number of NTP and SNTP client requests: typical 250 requests / sec.
(e.g. request of clients once every 60 sec
15'000 clients possible)
MTC-CAN-protocol for the communication with MTC Module CAN
(only
IPv4).
NTP Mode
Server, Peer, Broadcast, Multicast
NTP-
slave clock lines
1 line with up to 15 different time zone entries.
Communication through multicast or on IP request:
- RFC 3376: Internet Group Management Protocol, Version 3
- RFC 1112: Host extensions for IP multicasting
- RFC 4601: Protocol Independent Multicast - Sparse Mode (PIM-SM)
- RFC 3973: Protocol Independent Multicast - Dense Mode (PIM-DM)
Time zones (see App. B) Up to 80 predefined, 20 programmable entries (PC Software Tool)
Network interface
10BaseT / 100BaseTX (IEEE 802.3)
Data transmission rate: Auto-negotiation / manual
Connection:
RJ-45
Only shielded cable is allowed.
IP Configuration
DHCP, Static IP, IPv4, IPv6
Summary of Contents for DTS 4801.masterclock
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