VCL-2156, GPS/ GNSS/ NavIC, NTP Time Server, PRC ITUT-G.811

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

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The VCL-2156 NTP Server is an ITU-T G.811 Primary Reference Clock, designed to deliver highly accurate time and frequency synchronization. It locks to GPS / GNSS / NavIC references and provides NTP services to private networks such as Railways and Metro ticketing and platform systems, Airports and Air Traffic Control facilities, Electric Sub-Stations, Power Distribution and Transmission companies, Oil and Gas Utilities, ISPs, Cable TV networks, and Campus networks that require complete isolation from public networks for security reasons. VCL-2156 NTP Server is an advanced dual-band GPS clock supporting multi-constellation L1 (GPS, GNSS, SBAS, Galileo) and L5 (GPS, Galileo E5a, BeiDou B2a, NavIC) signals. Leveraging this dual-frequency capability, it delivers exceptional accuracy, reliability, and resilience.

Features and Highlights

GPS / GNSS / NavIC / SBAS / Galileo Input (TNC)
External Inputs: 1PPS (SMA), NTP (RJ45)
Functions as a Primary NTP Server
Support Anti-jamming and Anti-spoofing
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 Primary Reference when locked to GPS / GNSS / NavIC
ITU-T G.812 compliant holdover
Synchronization of NTP / SNTP clients
Supports Unicast, Multicast, Broadcast
NTP Peering
Leap Second correction Support
MD5/SHA1 authentication for NTP clients
1 x IRIG-B Un-Modulated DCLS (BNC)
1 x IRIG-B Modulated AM (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 Oscillator (OCXO) holdover
Stratum 1 when synchronized to GPS / GNSS / NavIC, or Stratum 2 hold-over
DC, or AC, or 1+1 Redundant AC+DC Power Supply options.

Inputs:	GPS/ GNSS/ NavIC, 1PPS and NTP*
Outputs:	NTP, 2.048MHz, 10MHz, 1PPM/1PPH, 1PPS, 1PPS Adj. (1μs – 200ms), 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.

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

Holdover (G.812) Synchronization:

OCXO (Double Oven-Controlled Crystal Oscillator)
OCXO Stability: ± 3ppb
Accuracy

One day Aging is ± 0.4ppb
20Year Aging is ± 80ppb

GPS/GNSS Receiver Specifications:

50 Channel GPS Receiver
62 Channel GNSS Receiver
GPS / GNSS L1(1575.42 MHz) frequency, C/A Code Receiver
NavIC L5 (1176.45 MHz) frequency, C/A Code Receiver
Tracks up to 32 satellites with Multiple Constellation.
Synchronizing Time:

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

GPS / GNSS / NavIC Signal

Tracking and Navigation: -165 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)

Synchronization Inputs:

1 x GPS / GNSS / NavIC (TNC)
1x 1PPS (SMA)
NTP Time Source (RJ45)

NTP Outputs:

4 x 10/100Mbps NTP / SNTP Interfaces
1 x 10/100Mbps user configurable NTP / SNTP interface

Frequency and Time Outputs:

1 x 2.048 MHz, 75 Ohms, phase-locked to GPS / GNSS / NavIC (BNC). ITU-T G.811 compliant.
1 x 10MHz, 50 Ohms, phase-locked to GPS / GNSS / NavIC (BNC). ITU-T G.811 compliant.
1 x 1PPS, phase-locked to UTC (BNC)
1 x 1PPS Adjustable Pulse-Width (1µs – 200ms) phase-locked to UTC (BNC)
1 x ToD (Time-Of-Day) output compliant to NMEA 0183 - RS232C (DB-9)
1 x IRIG-B Un-Modulated DCLS (BNC-50 Ohms)
(B000, B002, B003, B004)
1 x IRIG-B Modulated AM (RJ45) (B120, B122, B123, B124)
1 x 1 PPM / 1 PPH (BNC) - Programmable
1 x Potential Free Contact

Display:

LCD-display with back-light (HH: MM: SS) - 12/24 Hour Mode, number of satellites with selected Constellation.

Security and Protection:

Password Protection with password strength monitor
SSH

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
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

Local / Remote Management:

RS-232C (DB-9)
USB Serial
10/100BaseT Ethernet RJ45
1 x External Alarm Relay Contact.
Telnet / SSH (option to disable clear text communication to comply with NERC security requirements)
CLI Control Interface (Tera Term or putty)
SNMPv2, SNMPv3 Traps (MIB provided)
Syslog, HTTP, HTTPS, TCP, UDP, FTP, SCP, SFTP.