Power-Grade Industrial Grandmaster Clock
Stratum 1 NTP Server: NTS7500
embeds a high precision, multi-system GNSS module that supports GPS, GLONASS,
BEIDOU and GALILEO GNSS Systems for redundancy. When disconnected from a GNSS
time source, its integrated TCXO Oscillator, ensures time drift (1PPS output)
does not exceed 30 ppb matching and exceeding the requirements for Power
Substations. NTS7500 supports NTPv1/v2/v3/v4 Server and NTP/SNTP Client. Optional PTP Standard
Support: NTS7500 supports Layer-2 and Layer-3 over IPv4 transport; VLAN
Tagging; and Multicast, Unicast and Unicast Negotiation in both End-to-End and
Peer-to-Peer delay calculation modes. NTS7500 fully supports IEEE C37.238-2017
and IEEE/IEC 61850-9-3 – 2016 Power Profiles. Industrial and Substation Hardware : Designed to satisfy EMC
requirements for Substation-Grade equipment, NTS7500 has a minimum EMC Level 4
rating and is designed to function between -40°C and 85°C with passive cooling
only, allowing it to avoid the risk of having moving parts breakdown from constant
operations. Also, its powerful CPU supports up to 2,000 packets per second,
allowing endless applications and a large number of slaves to be supported
simultaneously. Redundancy through IEC62439-3 Clause 5 PRP. Proven design: No standardized
testing procedure for PTP devices exists. So ATOP tests its products yearly in
ISPCS Plugfests to demonstrate their reliability. NTS7500 was successfully
tested in Stockholm 2016, Monterey 2017, Geneva 2018 and Portland 2019. More
information available on www.ispcs.org. To achieve such accuracy, PTP works best on Local
Area Networks without passing through the internet: latencies and paths would
introduce variables latencies that couldn’t be accommodated for in the
accumulated delay calculations. PTP packets should always travel the same path
during each synchronization phase to preserve such high accuracy. PTP is
designed to work on Ethernet transport, Layer-2 (Data-link Layer) or Layer-3
IPv4. And there are two methods to calculate link delay: in End-to-End mode,
link delay is calculated from the source of the PTP packet until its
destination, while in Peer-to-Peer mode, link delay is calculated as between
each network node. In addition, PTP is Internet-capable, with IPv4 in unicast and
unicast negotiation modes. INTRODUCTION
A Powerful base for NTP and PTPThe NTS7500 1U 19’’ Rack-mount Modular NTP Server
with additional Grandmaster Clock feature is a high-powered rugged device that
offers good precision and reliability. Suitable for almost any environment and
complying with the harshest Industrial EMC conditions, ATOP’s device satisfies
all ndustry requirements for Industrial-grade networking timing
applications. Its modular architecture provides power-input redundancy and up
to 16 different outputs for legacy time Protocols – such as IRIG-B, BCD, ST, ST
with checksum.
APPLICATION CASEIEEE1588v2 Precision Time ProtocolPTP is the only protocol that allows network time synchronization in the
nanosecond-range. Current networking protocols nor legacy protocols allow such
a timestamp resolution. IEEE1588-2008 (v2) derives from an earlier version
issued by IEEE in 2002 that is not backward compatible. Being so exact about
timestamp resolution and timekeeping, IEEE1588v2 timestamps are required to be
hardware-generated, since no software could keep up with some stringent
requirements, no matter the processing power. PTP is a hierarchical protocol,
in which Grandmaster Clocks are directly synchronized with reference clocks
such as GNSS or Atomic Clocks, with subsequent layers reaching slaves devices.
PTP packets are timestamped with a nanosecond resolution.
Application exampleThis network diagram shows the use of ATOP’s
NTS7500 in a substation environment. The GMC is usually located in the office
building adjacent to the substation. On one side, it is connected to the GNSS
Antenna, with the other side being the Substation backbone connection. Every
switch connected to the Grandmaster should be able to handle all Precision time
Protocols by hardware, in order not to affect the synchronization quality.
Packets are delivered downstream through Boundary or Transparent clocks, where
they’ll reach PTP slaves – such as substation IEDs.
TECHNICAL
ETHERNET
| Standards | IEEE 802.3 10BaseT IEEE 802.3u 100BaseT(X) IEEE 802.3ab for 1000BaseT(X) IEEE 802.3u for 100Base-FX IEEE 802.3z for 1000Base-X ITU-T G.8261 Synchronous Ethernet (NTS7500-CPU-PTP only) |
| Ports | 2x 10/100/1000BASE-T(X) RJ45 combo ports 2x 100/1000 Base-X SFP Slots combo ports |
| LAN Mode | Dual Subnet or PRP (Parallel Redundancy Protocol) |
GNSS/CLOCK SPECIFICATIONS
| GNSS Input ports | 1x GNSS Input; 1 x BNC (F) | ||
| GNSS Module specific Information |
| ||
| 1PPS Output | 1x PPS Output, Square Wave, 1000ms pulse width, coaxial BNC (F)
connector | ||
| 10MHz Reference Output | 1x 10MHz Reference Output, Sine Wave, coaxial BNC (F) connector | ||
| Oscillator | Entry-level OCXO |
SOFTWARE
| Protocols |
| ||||||||||||||
| Supported MIBs | MIB II, IF-MIB, SNMPv2 MIB, BRIDGE-MIB, RMON MIB Group 1,2,3,9, RFC RFC 1157, RFC 1213, RFC 1215, RFC 1493, RFC 1643, RFC 1757, RFC 2011, RFC 2012, RFC 2013, RFC 2233, RFC 2571, RFC 2742, RFC 2819, RFC 2863, RFC 3411, RFC 3412, RFC 3413, RFC 3414, RFC 3415, RFC 2674 | ||||||||||||||
| Precision Time Protocol NTS7500-CPU-PTP only |
|
PHYSICAL CHARACTERISTICS
| Housing | SPCC IP30 Metal Housing |
| Dimension (core unit) (W x H x D) | 440 x 44 x 340 mm (not including screws and rack-mount kit) |
| Weight (core unit) | 5.6 Kg (not including module but module cover only) |
| Installation | 1U Rack-mount, Rack-mount kit included |
| Power inputs (core unit) | Dedicated 2 Power module slots (for redundancy) |
| Output modules (core unit) | Dedicated 2 Output module slots (IRIG-B and Serial freely exchangeable) |
ENVIRONMENTAL LIMITS
| Operating Temperature | -40°C~85°C (-40°F~185°F) / LCM display maximum 0~70 °C |
| Storage Temperature | -40°C~85°C (-40°F~185°F) / LCM display maximum -30~80 °C |
| Ambient Relative Humidity | 5%~95% (Non-condensing) |
POWER MODULES
|
Model name |
NTS7X00-AC Power Module |
NTS7X00-DC Power Module |
Power
| Input Voltage |
| ||
| Input Current (Max) |
| ||
| Input Power (Max) |
| ||
| Relay output |
|
Physical Characteristics
Dimension (W x H x D) Weight |
|
IRIG-B AND SERIAL OUTPUT EXPANSION MODULES
|
Model name |
NTS7X00-S1 |
|
Interface |
|
|
Connector |
2 x 12-pin terminal block |
|
Ports |
8 x RS-485 |
|
Protocols supported |
IRIG-B, BCD BJT, |
|
Configuration |
Software-selectable by port, |
|
Physical Characteristics |
|
|
Dimension (W x H x D) |
119.5 x 39.5 x 190.5 mm |
| NTS7X00 SERIAL MODULE | IRIG-B and Serial Output module for NTS7500 - 16-pin Terminal Block |
| NTS7X00-AC POWER MODULE | T;110~240 VAC;120-240 VDC,0.2A;G |
| NTS7X00-DC POWER MODULE | T;24-60 VDC;0.8A Max;G |
| NTS7500-CPU-PTP | IEEE1588v2 PTP Grandmaster and NTP Server core |
