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., 2.048 Mbit/s (E1), 2.048 MHz and 10 MHz). 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.

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 1.544 Mbits, 2.048 MBits, 2.048 MHz, and 1 PPS outputs
  • 1/5/10 MHZ, 1 PPS, and IRIG-B outputs
  • IEEE-1588v2 PTP Grandmaster
  • 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 Lightning Protection as per Telcordia GR-1089-CORE.
  • Standard RJ45 and BNC connectors for all inputs and outputs
  • LCD display with backlight.
  • Supports the KEY for MD5 encrypted NTP/SNTP packets
  • Support anti-jamming and anti-spoofing
  • GNSS Options:
    • GPS, GLONASS, GPS+GLONASS, and GPS+GLONASS+SBAS

Security Features and capabilities:

  1. MD5/SHA1 authentication for secured NTP access
  2. Key management for NTP clients
  3. Option to disable clear text (Telnet) for secure communication
  4. Supports Secure Shell (SSH) network protocol for encrypted communication
  5. Supports RADIUS server for secure authentication and access control
  6. Supports user-configurable Ethernet port protection
  7. Supports NTP peering for creating a redundant NTP server
  8. Encrypted password control to access the device
  9. Password Strength Monitoring
  10. Alert notifications using secure SNMPv3 traps

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, 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, 10 MHz, 2.048 MHz, 2.048 Mbps, 2.048 MHz / 10 MHz (TTL IN).
  • Output options: 8 x 2.048 Mbps / 1.544 Mbps, 8 x 2.048 MHz, 1 x PTP 1588v2 Grandmaster, 4 x NTP Server, 1/5/10 MHz, 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)