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

VCL Products > GPS > VCL-2145-D
VCL-2145-D
VCL-2145-D
VCL-2145-D
VCL-2145-D
VCL-2145-D
VCL-2145-D

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:

Application 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


Application Diagram

Note:

  • Accuracy between PTP Grandmaster and PTP Slave better than 100ns.
  • Phase synchronized 1PPS between PTP Grandmaster and PTP Slave.
Mechanical Drawing (PDF)

Valiant Communications is an ISO 9001:2015, ISO 10001:2018, ISO 14001:2015, ISO 27001:2013 and ISO 45001:2018 certified equipment manufacturer.

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