Redundant GPS, PTP, NTP Server Primary Reference Clock

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VCL-2145-D, GPS / GNSS (1+1), PRC (G.811), PTP, NTP, IRIG-B

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The VCL-2145-D is a high-performance, GPS / GNSS (Global Navigation Satellite System) Primary Reference Clock that provides ITU-T G.811 Primary Reference Clock, PTP (IEEE 1588v2), NTP and IRIG-B outputs which are locked with GPS/GNSS or user-selected input reference source. (i.e., 2.048Mbit/s (E1), 2.048MHz and 10MHz). The VCL-2145-D Satellite Receiver also has an integrated, high bandwidth NTP Server engine that is capable of handling up to 10,000 NTP requests per second. Multiple IRIG-B Outputs are also provided to synchronize local clock (time-of-day) display units to a central timing source with nanosecond accuracy.

GPS PTP (IEEE 1588v2) ITU-T G.812 NTP and IRIG-B

Features and Highlights:

Reliable, Cost-Efficient Reference GPS Receiver
50 Channel GNSS, L1 frequency, C/A Code Receiver
Up to 10,000 NTP requests per second
80,000 NTP Slaves supported
500,000 SNTP Slaves supported
ITU-T G.811 / Stratum 1 compliant (PR) Primary Reference when locked to GPS
ITU-T G.812 compliant holdover function
SSM Message format Compliant with ITU-T G.704. Optional GR-378-CORE for SONET Networks
GPS locked G.703 compliant 1.544Mbits, 2.048MBits, 2.048 MHz and 1 PPS outputs
1/5/10 MHZ, 1 PPS and IRIG-B outputs
IEEE-1588v2 PTP Grandmaster
SyncE
ToD compliant to NMEA 0183 (DB9 Serial Port)
4 x 10/100/1000BaseT NTP Ports
Additional 1 x 10/100 BaseT NTP Port for IPv4 / IPv6 operation
Leap Second Correction Support
Re-synchronization delay <5 minutes
User configurable offset to permit correction to local time
Concurrent IPv4 and IPv6 Operations
MD5 authentication for NTP clients
802.1Q VLAN support for NTP Ports
SSH, Telnet, Radius, SNMP V2 MIB, Password Protection
Available with 1+0 (VCL-2145, without GPS redundancy) and 1+1 (VCL-2145-D, with GPS redundancy) options
Power Contact and Lightening Protection as per Telcordia GR-1089-CORE.
Standard RJ45 and BNC connectors for all inputs and outputs
LCD display with back light.
Supports the KEY for MD5 encrypted NTP/SNTP packets
GNSS Options:

GPS, GLONASS, GPS+GLONASS and GPS+GLONASS+SBAS

Additional Features

IEEE - 1588v2 PTP Grandmaster
High bandwidth NTP Server supporting up to 10,000 NTP requests per second
Redundant AC and DC power supply options

Inputs:	GPS/GNSS (1+1), 10MHz, 2.048MHz, 2.048Mbit/s (E1)
Outputs:	NTP, PTP, 1.544Mbit/s (T1) / 2.048Mbit/s (E1), 2.048MHz, 10MHz, 1PPS, 1PPM, IRIG-B, ToD NMEA-0183
Power Supply:	24V DC, 48V DC, 110-220V DC, 110-240V AC, 1+1 Redundant PSU
Service Capacity:	Suitable for servicing up to 10,000 NTP / SNTP requests per second.

Available Version

Product

Description

VCL-2145-D, GPS Primary Reference (PRC) G.811 Clock, PTP 1588v2 Grandmaster and NTP Time Server (Available with 1+1 and 1+0 GPS receiver option)

The VCL-2145-D, GPS/GNSS Satellite Receiver also has an integrated, high bandwidth NTP Time Server engine. This equipment provides multiple Input reference and output options.
Input options: Single or Dual (1+1) GPS/GNSS, 10MHz, 2.048MHz, 2.048 Mbps, 2.048MHz / 10MHz (TTL IN).
Output options: 8 x 2.048 Mbps / 1.544 Mbps, 8 x 2.048MHz, 1 x PTP 1588v2 Grandmaster, 4 x NTP Server, 1/5/10MHz, 1PPS, Major Alarm, Minor Alarm, NMEA-0183 (TOD - Time-Of-Day), 6 x IRIG-B.
Holdover options: OCXO and Rubidium.

GPS/GNSS Receiver Specifications:

50 Channel GPS Receiver
72 Channel GNSS Receiver
GPS L1 frequency, C/A Code Receiver
Tracks up to 12 satellites in GPS only mode (GPS only version)
Tracks up to 24 satellites in GNSS mode (GNSS version)
Synchronizing Time:

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

GPS 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)
Phase Accuracy: As per ITU-T G.8272

System Access, Control and Management Options:

RS-232C Connector
USB Connector
10/100BaseT Ethernet
2 x External Alarm Relay Contact
Telnet (RFC 854 - RFC 861), FTP, SSH (incl. SFTP, SCP), RADIUS
HTTP/HTTPS (2616), SYSLOG, SNMP
CLI Control Interface (HyperTerminal or VT100)
SNMP v1, SNMP v2c, SNMP v3 Traps (MIB File provided)
Secured Access via SSH v1.3, SSH v1.5, SSH v2, RADIUS
CLI, English commands
GUI (Graphical User Interface) - Windows

Clock performance - GPS

Performance when locked to GPS / GNSS Timing accuracy: complaint to ITU-T G.811

Frequency Accuracy:

<1x10^-11 (24 hour average)
G.811 quality when locked to GPS / GNSS

Internal (G.812) Synchronization Options:

Rubidium Oscillator
OCXO (Oven-Controlled Crystal Oscillator)

Frequency Holdover

OCXO:

Stability
0.5x10^-9 (0.5 ppb) per day,
50x10^-9 (50 ppb) per year
Frequency stability: 6x10^-10 (-5°C to +55°C)

Rubidium:

Long term stability: ± 5x10^-11 / month
Frequency stability: < 1x10^-10 (-5°C to +55°C)

MTBF:

MTBF for VCL-2145 with RbXO Option:

Per MIL-HDBK-217F: ≥ 17 years @ 40°C
Per Telcordia SSR 332, Issue 1: ≥ 20 years @ 40°C

MTBF for VCL-2145-L C with OCXO Option:

Per MIL-HDBK-217F: ≥ 21 years @ 40°C
Per Telcordia SSR 332, Issue 1: ≥ 24 years @ 40°C

Applications Diagram:

VCL-2145-D

Application # 2: Assigning Multiple NTP Servers for high security applications and network segregation

IEEE-1588v2 Grandmaster and Boundary Function in PTP Network

Note:

Accuracy between PTP Grandmaster and PTP Slave better than 100ns.
Phase synchronized 1PPS between PTP Grandmaster and PTP Slave.

Mechanical Drawing (PDF)

Other Related Products:
VCL-2145-LC PRC (ITU-T G.811) VCL-2145-DE: GPS/GNSS (1+1), PRC (G.811), PTP, NTP, IRIG-B VCL-6066 Compact, Primary Reference Clock VCL-2145-SSU: 1+1 Redundant GPS / GNSS / Inputs / Outputs / Holdover NTP to IRIG-B, PTP to IRIG-B GPS / GNSS NTP Time Server GPS / GNSS, Primary Reference Clocks (ITU-T G.811) GPS / GNSS NTP Time Server PTP IEEE-1588v2 Grandmaster, PTP Slave, PTP Transparent Clock GPS to IRIG-B, GPS to 1PPS Servers Time Distribution, IRIG-B, 1PPS, RS-232 / RS-485

Valiant Communications is an ISO 9001:2015, ISO 10001:2018, ISO 14001:2015, ISO 27001:2022 and ISO 45001:2018 certified equipment manufacturer.

VCL-2145-D GPS/GNSS (1+1), PRC (G.811), PTP, NTP, IRIG-B

VCL Products > GPS > VCL-2145-D

Features and Highlights:

Additional Features

Available Version

GPS/GNSS Receiver Specifications:

System Access, Control and Management Options:

Clock performance - GPS

Frequency Accuracy:

Internal (G.812) Synchronization Options:

Frequency Holdover

MTBF:

Applications Diagram:

VCL-2145-D

IEEE-1588v2 Grandmaster and Boundary Function in PTP Network

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VCL-2145-D
GPS/GNSS (1+1), PRC (G.811), PTP, NTP, IRIG-B