VCL-3048, NTP Time Server

Product Overview

The VCL-3048 NTP Time Server is designed to provide NTP clock that is locked to a GPS / GNSS reference to provide time synchronization to private networks such as Railways and Metro (ticketing and platform) networks, Airports and Air-Traffic Control facilities, Electric Sub-Stations, Power Distribution and Transmission companies, 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. It may be also used by 2G, 3G and LTE service providers which provide a time of day reference to their customers over their wireless networks.

VCL-3048 locks to a GPS / GNSS reference to provide an NTP time reference on a 10/100BaseT Ethernet Port which can be used to serve various types of assets in the network.

The VCL-3048 is equipped with a highly accurate, TCXO to provided a high stability holdover clock in the event of unavailability of the GPS / GNSS signal, or GPS / GNSS antenna failure, or a temporary loss of reception in a totally isolated network without any external reference.

The VCL-3048 provides remote management and monitoring facility with a password based access using SSH as well as MD5 authentication to ensure operational reliability and security. Additional features include remote login and remote firmware upgrade (file transfer) capabilities. VCL-3048 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 include DHCP for installation convenience and support concurrent IPv4/IPv6 networks to provide NTP time and frequency synchronization.

NTP Server for accurate time-stamping
Incorrect time-stamp on CCTV Camera feed

NTP Time Server

Features and Highlights

  • GPS / GNSS time reference for SCADA applications
  • High bandwidth NTP performance
  • Upto 3000 NTP requests per second
  • 1 X 10/100 Mbit/s, RJ-45 NTP (Ethernet) interface
  • 3 x IRIG-B Un-Modulated Outputs (BNC, RS232, RS485)
  • Stratum 1 compliant (PR) Primary Reference when locked to GPS / GNSS
  • May be used to provide synchronization to upto 15,000 NTP and SNTP clients
  • Supports Unicast, Multicast and Broadcast
  • 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 3 specifications
  • Alert notifications via SNMP Traps, SNMPv2, SNMPv3
  • Concurrent IPv6 and IPv4 operation
  • Supported network protocols: IPv4, IPv6, SSH, TELNET, FTP, SYSLOG
  • Secure network management: enable or disable options
  • Temperature Compensated quartz oscillators (TCXO) hold-over
  • DC or AC Power Supply options.


The VCL-3048 provides a 10/100 BaseT Industrial Ethernet NTP Port that meets and complies with “Power Contact and Lightening Protection” as per Telcordia GR-1089-CORE and 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-3048 provides a better than 30 nanosecond accuracy to assure high bandwidth NTP Performance of better than 3000 NTP requests per second.

Monitoring and Management

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

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
  • Synchronizing Time:
    • Acquisition time - Hot Start: 1 sec.
    • Acquisition time - Warm Start: 28 sec.
    • Acquisition time - Cold Start: 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).

NTP Outputs:

  • 1 x 10/100Mbps NTP / SNTP Interface

IRIG-B Outputs:

  • 1 x 1 PPS, phase-locked to UTC (BNC)
  • 1 x IRIG-B Un-Modulated (BNC-50 Ohms)
    (B000, B002, B003, B004, B005, B006, B007
  • 1 x IRIG-B Un-Modulated, RS-485 Twisted pair
    (B000, B002, B003, B004, B005, B006, B007) or
  • 1 x IRIG-B Un-Modulated, RS-232 Twisted pair
    (B000, B002, B003, B004, B005, B006, B007)

Configuration and Monitoring Software:

  • Telnet, SSH, CLI
  • NMS - GUI (Graphical User Interface) - Runs on any PC operating on Windows 7, Windows 8 or Windows 10 OS.

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

Power Supply:

  • DC 24V
  • DC 48V
  • DC 110~220V (with external Adapter)
  • AC power (100 to 240V AC, 50/60 Hz with external Adapter)
  • Reverse Polarity Protection

Power Consumption:

  • < 10W at ambient (steady state 24°C)

Antenna Specifications:

  • Antenna Type: Active
  • Polarization: Right hand circular
  • Frequency Band: 1575.42 MHz + 10 MHz
  • Amplifier Gain: 40dB + 4dB
  • VSWR: <2.0 Max, 1.0 Typical
  • Operating temperature: -40C to +85C
  • Out of Band Rejection: > -60dB @ +50MHz off center (1575.42 MHz) frequency
  • Lightening Protection: According to EN61000-4-5 Level 3 (Optional)
  • LMR400 (or equivalent) Cable Length - 30, 50, 60 and 90 meters.


  • Per MIL-HDBK-217F: ≥ 33 years @ 24C
  • Per Telcordia SSR 332, Issue 1: ≥ 42 years @ 24C

Standards & Compliance

  • IEC - EMC – Certified to EN 55022: CISPR 22, EN 55024:2005
  • 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

VCL-3048, NTP Server

Data Sheet