GNSS NTP Time Synchronization Server, G.811 Primary Reference

VCL Products > GPS / GNSS Time Servers > VCL-2156, GPS NTP Time Server

VCL-2156, GPS NTP Time Server

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The VCL-2156, NTP SERVER is designed to provide NTP and ITU-T G.811 Primary Reference Clock that is locked to a GPS / GNSS reference to provide time synchronization to private networks such as Railways and Metro networks, Airports and Air-Traffic Control facilities, Power Utilities, Oil and Gas Utilities, ISPs and Cable TV networks as well as to Campus networks that are required to maintain a complete isolation from public networks for security reasons. VCL-2156 locks to a GPS / GNSS reference to provide an NTP time reference on up to 4+1, 10/100BaseT Ethernet Ports which can be segregated to serve separate classes of assets in the network.

ITU-T G.811 PRC 2G, 3G & LTE GPS/GNSS OCXO

Features and Highlights

GPS / GNSS Input
NTP Input*
Functions as a Primary NTP Server
Automatic failover to function as a secondary NTP Server, in the absence of GPS Signal
High bandwidth NTP performance
Upto 7,500 NTP requests per second
40,000 NTP Slaves supported
250,000 SNTP Slaves supported
Multiple NTP Ports - 4+1 x Independent 10/100 Mbit/s, RJ-45 Ethernet interfaces
Parallel Redundancy Protocol (PRP) Switch - Optional
ITU-T G.811 / Stratum 1 compliant (PR) Primary Reference when locked to GPS/GNSS
ITU-T G.812 compliant holdover
Synchronization of NTP / SNTP clients
Supports Unicast, Multicast, Broadcast
Leap Second correction Support
MD5 / SHA1 authentication Key Management for NTP clients
1 x IRIG-B Un-Modulated (BNC)
1 x IRIG-B Modulated (RJ45)
Meets and comply with Power Contact and Lightening Protection as per EN61000-4-5 Level 3 specifications.
Alert notifications via SNMP Traps, SNMPv2, SNMPv3, SMTP (Email)
Concurrent IPv6 and IPv4 operation
Supported network protocols: IPv4, IPv6, SSH, TELNET, FTP, SYSLOG, SCP, SFTP, TCP, UDP
DHCP Support
Secure network management: enable or disable options
Double Oven Quartz Oscillators (OCXO) hold-over
Stratum 1 when synchronized to GPS/GNSS, or Stratum 2 hold-over
DC, or AC, or 1+1 Redundant AC+DC Power Supply options.

*The NTP Input supports only the Sub-Master clock feature, ensuring synchronized outputs from the four NTP server RJ45 ports, when the GPS/GNSS antenna is disconnected.

Performance

The VCL-2156 has 4+1, 10/100 BaseT Industrial Ethernet Ports that meet and comply with “Power Contact and Lightening Protection” as per EN61000-4-5 Level 3 specifications making it suitable for the equipment to be installed in harsh industrial environments which include Electric Sub-Stations, Railway and Metro Networks.

VCL-2156 provides a better than 30 nanosecond accuracy to assure high bandwidth NTP Performance of better than 7,500 NTP requests per second (40,000 NTP Slaves supported ).

Security Features and capabilities:

MD5/SHA1 authentication for secured NTP access
Key management for NTP clients
Option to disable clear text (Telnet) for secure communication
Supports Secure Shell (SSH) network protocol for encrypted communication
Supports RADIUS server for secure authentication and access control
Supports user-configurable Ethernet port protection
Supports NTP Peering for creating a redundant NTP server
Encrypted Password Control to access the device
Password Strength Monitoring
Alert notifications using secure SNMPv3 traps

Inputs:	GPS/GNSS, NTP*
Outputs:	NTP, 2.048MHz, 10MHz, 1PPM/1PPH, 1PPS, ToD NMEA 0183, IRIG-B (Unmodulated and Modulated)
Power Supply:	24V DC, 48V DC, 110-220V DC, 110-240V AC, 1+1 Redundant PSU
Service Capacity::	Suitable for servicing up to 7500 NTP / SNTP requests per second.

Time and Frequency OUTPUT options and other highlights:

5 x NTP (Multiple NTP Ports - 4+1 x Independent 10/100 Mbit/s, RJ-45 Ethernet interfaces)
Automatic failover to function as a secondary NTP Server, in the absence of GPS Signal
Primary Reference when locked to GPS/GNSS (ITU-T G.811 / Stratum 1 compliant)
ITU-T G.812 compliant holdover [OCXO (Double Oven-Controlled Crystal Oscillator)]
1 x 2.048 MHz, 75 Ohms, phase-locked to GPS / GNSS (BNC). ITU-T G.811 compliant.
1 x 10MHz, 50 Ohms, phase-locked to GPS / GNSS (BNC). ITU-T G.811 compliant.
1 x 1PPS, phase-locked to UTC (BNC)
1 x ToD (Time-Of-Day) output compliant to NMEA 0183 - RS232C (Db9)
1 x IRIG-B Un-Modulated (BNC-50 Ohms) (B000, B002, B003, B004)
1 x IRIG-B Modulated (RJ45) (B120, B122, B123, B124)
1 x 1 PPM / 1 PPH - Programmable
1 x Potential Free Contact

In peering mode, in addition to its GPS reference, VCL-2156 can be configured to receive and monitor time from an additional Stratum 1 NTP Server available on the network. This allows the unit to fall back to its peer source in the event its primary reference becomes unavailable.

GPS/GNSS Receiver Specifications:

50 Channel GPS Receiver
72 Channel GNSS Receiver
GPS L1 frequency, C/A Code Receiver
Tracks up to 12 satellites simultaneously
Synchronizing Time:

Acquisition time - Hot Start: Less than 1 sec.
Acquisition time - Warm Start: Less than 28 sec.
Acquisition time - Cold Start: Less than 28 sec.

GPS / GNSS Signal:

Tracking and Navigation: -162 dBm
Reacquisition -160 dBm
Cold Start -148 dBm

Antenna Connector: TNC
Accuracy Of Time-Pulse Signal referenced to GPS: ± 30ns (raw)
Accuracy Of Time-Pulse Signal referenced to GNSS: ± 20ns (raw)
Accuracy Of Time-Pulse Signal referenced to GPS/GNSS: ± 15ns (compensated)
(Note: with all satellites in view at -130db).

Frequency and Time Outputs:

1 x 2.048 MHz, 75 Ohms, phase-locked to GPS / GNSS (BNC). ITU-T G.811 compliant.
1 x 10MHz, 50 Ohms, phase-locked to GPS / GNSS (BNC). ITU-T G.811 compliant.
1 x 1PPS, phase-locked to UTC (BNC)
1 x ToD (Time-Of-Day) output compliant to NMEA 0183 - RS232C (Db9)
1 x IRIG-B Un-Modulated (BNC-50 Ohms)
(B000, B002, B003, B004)
1 x IRIG-B Modulated (RJ45)
(B120, B122, B123, B124)
1 x 1 PPM / 1 PPH - Programmable
1 x Potential Free Contact

Security and Protection:

Password Protection with password strength monitor
SSH.

Standards & Compliance

IEC - EMC – Certified to EN 55022: CISPR 32, EN 55024:2005, IEC 61000-4-2, IEC 60255 / IEC 61000-4-6, IEC 61000-4-8, 61000-4-9, IEC 60255-22-6, IEC 60255-5:2000, IEC 61000-4-3, IEC 61000-4-4, IEC 61000-4-18, IEC 61000-4-17, IEC 60950, IEC 60068-2-1, IEC 60068-2-2, IEC 60068-2-14, IEC 60068-2-30, IEC 61850-3, IEC 60068-2-40, IEC 60068-2-6, IEC 60068-2-27
RoHS, CE – 2001/95/EC, 2006/95/EC, EN60950-1, EN61000-6-2, EN61000-6-4
FCC – FCC Part 15 B Class A: Conducted Emission test on Power Line
FCC Part 15 B Class A: Radiated Emission >1 GHz FCC, 6 GHz, on Power Line

Network Time Protocol:

NTP v2, (RFC 1119), NTP v3 (RFC 1305), NTP v4, (RFC 5905), SNTP v3 (RFC 1769), SNTP v4 (RFP 2030), MD5 Authentication
Upto 7,500 NTP requests per second

40,000 NTP Slaves supported
250,000 SNTP Slaves supported

Internet Protocol: IPv4/IPv6
NTP version 4.2.8p7
Time Protocol: TIME (RFC 868)
Daytime Protocol: DAYTIME (RFC 867)
Supports Unicast, Multicast and Broadcast
NTP Peering

Monitoring and Management

The configuration can be managed by GUI. A text based and menu driven setup utility is also available via Telnet or SSH. An optional NMS allows multiple systems installed on a networks to be monitored and configured from a single or multiple management locations.