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

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
• 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 authentication 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
• 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.

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 ).

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.

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