VCL-2424, PRC (G.811), NTP Server & PTP IEEE-1588v2 Grandmaster – DIN Rail Version

Product Overview

The VCL-2424 is a compact, industrial grade DIN Rail mounted GPS / GNSS, ITU-T G.811 Primary Reference Master Clock (PRC), PTP IEEE-1588v2 Grandmaster and NTP Time Server synchronization solution that is designed to be installed in harsh environments to provide highly precise time and phase synchronized frequency and time of day references.

User applications include industrial application, electric sub-stations, power distribution infrastructure, solar farms, wind-farms, railways and metro signaling infrastructure, airports and air-traffic control facilities, 2G, 3G, 4G and LTE mobile cell towers, off-shore oil and gas rigs and naval vessels that are required to operate in complete isolation due to the very nature of their application, geographical location or due to security reasons.

The VCL-2424 is equipped with a highly accurate, low-noise OCXO to provide a high stability, ITU-T G.812, Type II, III compliant holdover clock with better than 12μs accuracy over a 24-hour (5 milliseconds per year) period in the event of unavailability of the GNSS (GPS/GLONASS) signal, or GNSS (GPS/GLONASS) antenna failure, or a temporary loss of reception occurring due to stormy weather conditions or solar flares or without any external reference.

VCL-2424 establishes a highly accurate phase-synchronized frequency and time base by synchronizing to the GNSS (GPS/GLONASS) satellites' atomic clocks to distribute synchronized time over packet based networks including Ethernet, Carrier Ethernet, IP and IP/MPLS Networks.

Data SheetVCL-2424-D

The VCL-2424 provides a wide range of GNSS (GPS/GLONASS) referenced frequency and time sources (outputs) that include 2.048MHz, 10MHz, 1PPS as well as an NMEA, 1588v2 PTP and an NTPv4 time reference. Features such as maintaining a distinctly separate IP address for system management and control, password based access, SSH as well as MD5 authentication ensures operational reliability and security. Additional features include remote login and remote firmware upgrade (file transfer) capabilities. VCL-2424 includes complete SNMP monitoring as well as support for enterprise directory services for user authentication, internal and external logging and monitoring of alarm and error messages through Syslog ensures a high level of system manageability. Other features includes support concurrent IPv4/IPv6 support for future network upgradation

Application Diagram:


  • VCL-2424 is powered by a high-performance microprocessor and a highly precise GNSS (GPS/GLONASS) based time receiver that provides a better than 30 nanosecond accuracy.
  • VCL-2424 is designed to provide NTP and PTP time and frequency synchronization, with separate individual ports for each type of service.
  • The VCL-2424 meets and complies with “Power Contact and Lightening Protection” as per Telcordia GR-1089-CORE and EN61000-4- 5 Level 4 specifications making it suitable for the equipment to be installed in harsh industrial environments.

Features and Highlights

  • ITU-T G.811 compliant 2.048MHz and 10MHz frequency outputs
  • IEEE-1588v2 PTP Grandmaster
  • <100ns Accuracy when locked with GNSS (GPS/GLONASS)
  • Compact DIN RAIL aluminum chassis
  • Standard PTP Profiles supported: Default, Telecom, Power, SMPTE, Telecom2 and Power2
  • High bandwidth NTP performance. Supports up to 3000 NTP requests per second
  • Synchronization of NTP and SNTP clients
  • Leap Second Correction Support
  • MD5 authentication for NTP clients
  • Meets and comply with Power Contact and Lightening Protection as per Telcordia GR-1089-CORE and EN61000-4-5 Level 4 specifications
  • Alert notifications via SNMP Traps
  • Concurrent IPv6 and IPv4 operation
  • Supported networking protocols: IPv4, Ipv6, SSH, FTP, SYSLOG, SNMPv2 and TELNET
  • Double Oven Quartz Oscillators (OCXO) hold-over
  • Automatic and continuous OCXO Calibration from GPS reference
  • Stratum 1 when synchronized to GPS/GNSS, or Stratum 2 hold-over
  • 24 VDC, 48 VDC, 110 VDC, 220 VDC and 220 VAC power supply options.

Monitoring and Management:

The configuration of the system can be managed by Graphical User Management Interface. Alternatively, a text based and menu driven setup utility can be started via Telnet or SSH. An optional Graphical User Network Management Interface (NMS) allows multiple systems to be monitored and configured from single or multiple management locations.

Synchronization Inputs:

  • 1 x GPS

Frequency Outputs:

  • 1 x 2.048 MHz, 75 Ohms, phase-locked
  • 1 x 10 MHz, 50 Ohms, phase-locked
  • 1 x 1 PPS, phase-locked to UTC (BNC)

PTP IEEE 1588-2008 V2 Grandmaster:

  • < 100ns Accuracy when locked with GNSS (GPS/GLONASS) in Stationary Mode
  • PTP Slave/Client capacity: 8, 16, 32
  • User Configurable: 1-step and 2-step Clock

PTP Outputs:

  • 1 x 10/100/1000Base-T (RJ45) Electrical Port.

NTP Output:

  • 1 x 10/100 Mbps user configurable NTP interface

Technical Specifications

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 for GPS
  • Tracks up to 24 satellites simultaneously for GNSS (GPS+GLONASS)
  • Synchronizing Time:
    • Acquisition time - Hot Start: Less than 15 sec.
    • Acquisition time - Warm Start: Less than 45 sec.
    • Acquisition time - Cold Start: Less than 140 sec.
  • GPS Signal
    • Tracking and Navigation: -162 dBm
    • Reacquisition -160 dBm
    • Cold Start -148 dBm
  • Integrated GPS Antenna
  • Accuracy of Time-Pulse Signal referenced to GPS: +/-30ns (raw), in Stationary Mode
  • Accuracy of Time-Pulse Signal referenced to GNSS: +/-20ns (raw) in Stationary Mode
  • Accuracy of Time-Pulse Signal referenced to GPS/GNSS: +/-15ns (compensated)
    (Note: with all satellites in view at -130db)
  • User configurable for “Stationary” or “Moving” Applications. May be configured for use in Portable, Automobile, Maritime Application Modes.

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
  • Internet Protocol: Ipv4
  • Time Protocol: TIME (RFC 868)
  • Daytime Protocol: DAYTIME (RFC 867)

Frequency Outputs:

  • 1 x 2.048 MHz, 75 Ohms, phase-locked
  • 1 x 10 MHz, 50 Ohms, phase-locked
  • 1 x 1 PPS, phase-locked to UTC (BNC)

PTP IEEE 1588-2008 V2 Grandmaster:

  • <100ns Accuracy when locked with GNSS (GPS/GLONASS) in Stationary Mode
  • PTP Slave/Client capacity: 8, 16, 32
  • User Configurable: 1-step and 2-step Clock

PTP Profiles:

  • Default IEEE-1588v2, 2008 PTP Profile
  • Default Power Profile.
  • Power Profile: IEEE C37.238-2011
  • Ethernet Default Profile (Layer 2 multicast)
  • Telecom-2008 Profile (Layer 3 unicast, pre-standard ITU-T G.8265.1, Ipv4)
  • ITU-T G.8265.1 (Layer 3 unicast, Ipv4)
  • Communication: Unicast, Multicast or Mixed
  • Best Master Clock Algorithm (BMCA)

Antenna Specifications:

  • Integrated Antenna
  • Antenna Type: Active
  • Amplifier Gain: Typical 27dB (GPS L1 band)
  • Operating temperature: -40C to +75C
  • Reverse Polarity Protection
  • Lightening Protection: According to EN61000-4-5 Level 4.

Data Sheet

Data SheetVCL-2424