VCL-3048, NTP Time Server with IRIG-B Outputs

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VCL-3048, NTP Time Server

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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 on a 10/100 BaseT Ethernet Port which can be used to serve various types of assets in the network.

GPS / GNSS 2G, 3G and LTE 10/100 BaseT Ethernet

Features and Highlights

High Accuracy GPS / GNSS time reference for SCADA applications
1 X 10/100 Mbit/s, RJ-45 NTP (Ethernet) interface
Stratum 1 compliant (PR) Primary Reference Source when locked to GPS / GNSS
High bandwidth NTP performance
Services up to 3,000 NTP requests per second
3 x IRIG-B Unmodulated Outputs

1 x BNC (50 Ohms),
1 x RS-232 (Terminal),
1 x RS-485 (Terminal)

1 x 1PPS
External Dry Contact Alarms Relay (NO/NC)
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 (15~60) V DC Power Supply.

Performance

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 3,000 NTP requests per second.

Monitoring and Management

The VCL-3048 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.

Block Diagram

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)
1 x IRIG-B Un-Modulated, RS-485 Terminal
1 x IRIG-B Un-Modulated, RS-232 Terminal

Management and Monitoring Software:

Telnet / SSH (option to disable clear text communication to comply with NERC security requirements)
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, SHA1 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

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

MTBF:

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

Standards & Compliance

IEC - EMC – Certified to EN 55032: CISPR 32, 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

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